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arthas简单使用

發(fā)布時間：2024/8/26 综合教程 33 生活家

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有時候在生產(chǎn)或者測試環(huán)境有些方法執(zhí)行比較耗時，一種簡單粗暴的方法是在可能的地點打日志進行監(jiān)視，另一種就是借助于插件進行檢測。最近也是有機會了解并實際運用了arthas這個插件，還是挺方便的。而且也可以用于查看JVM信息、線程信息以及系統(tǒng)屬性等信息。

arthas(中文阿爾薩斯)：https://arthas.aliyun.com/zh-cn/

下載：

curl -O https://arthas.aliyun.com/arthas-boot.jar

0.本地準備一個java進程

package arthas;

public class ArthasTest {

    public static void main(String[] args) {
        System.out.println(Thread.currentThread().getName());
        String test = System.getProperty("test");

        while (true) {
            String test2 = System.getProperty("test");
            if (test2 != null && !test2.equals(test)) {
                System.out.println(test2);
                test = test2;
            }
        }
    }
}

啟動該主類

1.啟動arthas

C:UsersqlqDesktopplaintools>java -jar arthas-boot.jar
[INFO] arthas-boot version: 3.4.5
[INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER.
* [1]: 20384 org.jetbrains.idea.maven.server.RemoteMavenServer36
  [2]: 1556
  [3]: 28868 arthas.ArthasTest
  [4]: 16780 org.jetbrains.jps.cmdline.Launcher
  [5]: 7676 org.jetbrains.jps.cmdline.Launcher
3
[INFO] local lastest version: 3.4.5, remote lastest version: 3.4.6, try to download from remote.
[INFO] Start download arthas from remote server: https://arthas.aliyun.com/download/3.4.6?mirror=aliyun
[INFO] File size: 11.99 MB, downloaded size: 813.01 KB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 1.58 MB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 2.36 MB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 3.14 MB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 3.93 MB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 4.71 MB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 5.49 MB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 6.28 MB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 7.06 MB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 7.33 MB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 8.81 MB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 9.59 MB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 10.37 MB, downloading ...
[INFO] File size: 11.99 MB, downloaded size: 11.56 MB, downloading ...
[INFO] Download arthas success.
[INFO] arthas home: C:Usersjxrt.arthaslib3.4.6arthas
[INFO] Try to attach process 28868
[INFO] Found java home from System Env JAVA_HOME: E:javaJAVA8
[INFO] Attach process 28868 success.
[INFO] arthas-client connect 127.0.0.1 3658
  ,---.  ,------. ,--------.,--.  ,--.  ,---.   ,---.
 /  O   |  .--. ''--.  .--'|  '--'  | /  O   '   .-'
|  .-.  ||  '--'.'   |  |   |  .--.  ||  .-.  |`.  `-.
|  | |  ||  |      |  |   |  |  |  ||  | |  |.-'    |
`--' `--'`--' '--'   `--'   `--'  `--'`--' `--'`-----'


wiki      https://arthas.aliyun.com/doc
tutorials https://arthas.aliyun.com/doc/arthas-tutorials.html
version   3.4.6
pid       28868
time      2021-01-12 20:54:40

[arthas@28868]$

arthas 會自動檢測進程ID，需要自己選擇一個PID然后進入，上面我輸入3

2.基本命令

1.dashboard 當前系統(tǒng)的實時數(shù)據(jù)面板：包括線程、JVM、操作系統(tǒng)屬性等

[arthas@28868]$ dashboard
ID     NAME                                       GROUP                 PRIORITY      STATE         %CPU           DELTA_TIME    TIME          INTERRUPTED    DAEMON
1      main                                       main                  5             RUNNABLE      0.0            0.000         6:9.250       false          false
-1     C1 CompilerThread3                         -                     -1            -             0.0            0.000         0:0.546       false          true
-1     C2 CompilerThread2                         -                     -1            -             0.0            0.000         0:0.296       false          true
-1     C2 CompilerThread0                         -                     -1            -             0.0            0.000         0:0.281       false          true
-1     C2 CompilerThread1                         -                     -1            -             0.0            0.000         0:0.203       false          true
25     arthas-NettyHttpTelnetBootstrap-3-2        system                5             RUNNABLE      0.0            0.000         0:0.078       false          true
5      Attach Listener                            system                5             RUNNABLE      0.0            0.000         0:0.046       false          true
-1     VM Thread                                  -                     -1            -             0.0            0.000         0:0.031       false          true
2      Reference Handler                          system                10            WAITING       0.0            0.000         0:0.015       false          true
3      Finalizer                                  system                8             WAITING       0.0            0.000         0:0.015       false          true
18     arthas-NettyHttpTelnetBootstrap-3-1        system                5             RUNNABLE      0.0            0.000         0:0.015       false          true
26     arthas-command-execute                     system                5             TIMED_WAITING 0.0            0.000         0:0.015       false          true
4      Signal Dispatcher                          system                9             RUNNABLE      0.0            0.000         0:0.000       false          true
15     arthas-timer                               system                5             WAITING       0.0            0.000         0:0.000       false          true
19     arthas-NettyWebsocketTtyBootstrap-4-1      system                5             RUNNABLE      0.0            0.000         0:0.000       false          true
20     arthas-NettyWebsocketTtyBootstrap-4-2      system                5             RUNNABLE      0.0            0.000         0:0.000       false          true
21     arthas-shell-server                        system                5             TIMED_WAITING 0.0            0.000         0:0.000       false          true
22     arthas-session-manager                     system                5             TIMED_WAITING 0.0            0.000         0:0.000       false          true
23     arthas-UserStat                            system                5             WAITING       0.0            0.000         0:0.000       false          true
27     Timer-for-arthas-dashboard-2d53a13f-e23f-4 system                5             RUNNABLE      0.0            0.000         0:0.000       false          true
-1     GC task thread#7 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#6 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     VM Periodic Task Thread                    -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#0 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     Service Thread                             -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#1 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#2 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
Memory                               used        total       max          usage       GC
heap                                 58M         241M        3582M        1.64%       gc.ps_scavenge.count                       1
ps_eden_space                        50M         63M         1322M        3.80%       gc.ps_scavenge.time(ms)                    7
ps_survivor_space                    8M          10M         10M          79.64%      gc.ps_marksweep.count                      0
ps_old_gen                           88K         172032K     2751488K     0.00%       gc.ps_marksweep.time(ms)                   0
nonheap                              27M         28M         -1           96.88%
code_cache                           5M          5M          240M         2.21%
metaspace                            19M         20M         -1           96.71%
compressed_class_space               2M          2M          1024M        0.23%
direct                               0K          0K          -            105.88%
mapped                               0K          0K          -            0.00%
Runtime
os.name                                                                               Windows 10
os.version                                                                            10.0
java.version                                                                          1.8.0_171
java.home                                                                             E:javaJAVA8_171jre
systemload.average                                                                    -1.00
processors                                                                            8
timestamp/uptime                                                                      Tue Jan 12 20:56:26 CST 2021/370s

　　上面信息可以看到JVM的內(nèi)存信息，也可以查看到每個區(qū)域的GC信息。同時也可以看到使用的垃圾收集器是JDK8默認的-XX:+UseParallelGC 使用ParallelScavenge + Serial Old(PS MarkSweep)收集器組合

2.thread 查看線程信息

[arthas@28868]$ thread
Threads Total: 29, NEW: 0, RUNNABLE: 8, BLOCKED: 0, WAITING: 4, TIMED_WAITING: 2, TERMINATED: 0, Internal threads: 15
ID     NAME                                       GROUP                 PRIORITY      STATE         %CPU           DELTA_TIME    TIME          INTERRUPTED    DAEMON
1      main                                       main                  5             RUNNABLE      101.42         0.203         8:3.609       false          false
2      Reference Handler                          system                10            WAITING       0.0            0.000         0:0.015       false          true
3      Finalizer                                  system                8             WAITING       0.0            0.000         0:0.015       false          true
4      Signal Dispatcher                          system                9             RUNNABLE      0.0            0.000         0:0.000       false          true
5      Attach Listener                            system                5             RUNNABLE      0.0            0.000         0:0.046       false          true
15     arthas-timer                               system                5             WAITING       0.0            0.000         0:0.000       false          true
18     arthas-NettyHttpTelnetBootstrap-3-1        system                5             RUNNABLE      0.0            0.000         0:0.015       false          true
19     arthas-NettyWebsocketTtyBootstrap-4-1      system                5             RUNNABLE      0.0            0.000         0:0.000       false          true
20     arthas-NettyWebsocketTtyBootstrap-4-2      system                5             RUNNABLE      0.0            0.000         0:0.000       false          true
21     arthas-shell-server                        system                5             TIMED_WAITING 0.0            0.000         0:0.000       false          true
22     arthas-session-manager                     system                5             TIMED_WAITING 0.0            0.000         0:0.000       false          true
23     arthas-UserStat                            system                5             WAITING       0.0            0.000         0:0.000       false          true
25     arthas-NettyHttpTelnetBootstrap-3-2        system                5             RUNNABLE      0.0            0.000         0:0.125       false          true
26     arthas-command-execute                     system                5             RUNNABLE      0.0            0.000         0:0.015       false          true
-1     C2 CompilerThread2                         -                     -1            -             0.0            0.000         0:0.328       false          true
-1     GC task thread#7 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#6 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     VM Periodic Task Thread                    -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#0 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     C2 CompilerThread0                         -                     -1            -             0.0            0.000         0:0.296       false          true
-1     Service Thread                             -                     -1            -             0.0            0.000         0:0.000       false          true
-1     C2 CompilerThread1                         -                     -1            -             0.0            0.000         0:0.218       false          true
-1     GC task thread#1 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     C1 CompilerThread3                         -                     -1            -             0.0            0.000         0:0.609       false          true
-1     VM Thread                                  -                     -1            -             0.0            0.000         0:0.031       false          true
-1     GC task thread#2 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#3 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#5 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#4 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true

例如：thread 1會打印線程ID 1的棧，通常是main函數(shù)的線程。

[arthas@28868]$ thread 1 | grep 'main('
    at arthas.ArthasTest.main(ArthasTest.java:15)

補充：也可以查看線程的阻塞情況，只支持找出synchronized關(guān)鍵字阻塞住的線程，如果是java.util.concurrent.Lock，目前還不支持。

如下一段程序：

package arthas;

public class ArthasTest {

    public static void main(String[] args) {
        MyTask myTask = new MyTask();
        for (int i = 0; i < 2; i++) {
            new Thread(myTask).start();
        }
    }
}

class MyTask implements Runnable {

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() + "開始執(zhí)行");
        synchronized (this) {
            System.out.println(Thread.currentThread().getName() + " 占用鎖");
            try {
                Thread.sleep(1 * 30 * 60 * 1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

結(jié)果：

Thread-0開始執(zhí)行
Thread-0 占用鎖
Thread-1開始執(zhí)行

可以用jstack查看，也可以用arthas：如下

[arthas@22336]$ thread -b
"Thread-0" Id=14 TIMED_WAITING
    at java.lang.Thread.sleep(Native Method)
    at arthas.MyTask.run(ArthasTest.java:21)
    -  locked arthas.MyTask@7253ba6b <---- but blocks 1 other threads!
    at java.lang.Thread.run(Thread.java:748)

[arthas@22336]$ thread
Threads Total: 31, NEW: 0, RUNNABLE: 8, BLOCKED: 1, WAITING: 4, TIMED_WAITING: 3, TERMINATED: 0, Internal threads: 15
ID     NAME                                       GROUP                 PRIORITY      STATE         %CPU           DELTA_TIME    TIME          INTERRUPTED    DAEMON
2      Reference Handler                          system                10            WAITING       0.0            0.000         0:0.000       false          true
3      Finalizer                                  system                8             WAITING       0.0            0.000         0:0.000       false          true
4      Signal Dispatcher                          system                9             RUNNABLE      0.0            0.000         0:0.000       false          true
5      Attach Listener                            system                5             RUNNABLE      0.0            0.000         0:0.031       false          true
18     arthas-timer                               system                5             WAITING       0.0            0.000         0:0.000       false          true
21     arthas-NettyHttpTelnetBootstrap-3-1        system                5             RUNNABLE      0.0            0.000         0:0.031       false          true
22     arthas-NettyWebsocketTtyBootstrap-4-1      system                5             RUNNABLE      0.0            0.000         0:0.000       false          true
23     arthas-NettyWebsocketTtyBootstrap-4-2      system                5             RUNNABLE      0.0            0.000         0:0.000       false          true
24     arthas-shell-server                        system                5             TIMED_WAITING 0.0            0.000         0:0.000       false          true
25     arthas-session-manager                     system                5             TIMED_WAITING 0.0            0.000         0:0.000       false          true
26     arthas-UserStat                            system                5             WAITING       0.0            0.000         0:0.000       false          true
28     arthas-NettyHttpTelnetBootstrap-3-2        system                5             RUNNABLE      0.0            0.000         0:0.093       false          true
29     arthas-command-execute                     system                5             RUNNABLE      0.0            0.000         0:0.015       false          true
14     Thread-0                                   main                  5             TIMED_WAITING 0.0            0.000         0:0.000       false          false
15     Thread-1                                   main                  5             BLOCKED       0.0            0.000         0:0.000       false          false
16     DestroyJavaVM                              main                  5             RUNNABLE      0.0            0.000         0:0.343       false          false
-1     C2 CompilerThread2                         -                     -1            -             0.0            0.000         0:0.218       false          true
-1     GC task thread#7 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#6 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     VM Periodic Task Thread                    -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#0 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     C2 CompilerThread0                         -                     -1            -             0.0            0.000         0:0.203       false          true
-1     Service Thread                             -                     -1            -             0.0            0.000         0:0.000       false          true
-1     C2 CompilerThread1                         -                     -1            -             0.0            0.000         0:0.218       false          true
-1     GC task thread#1 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     C1 CompilerThread3                         -                     -1            -             0.0            0.000         0:0.640       false          true
-1     VM Thread                                  -                     -1            -             0.0            0.000         0:0.015       false          true
-1     GC task thread#2 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#3 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#5 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true
-1     GC task thread#4 (ParallelGC)              -                     -1            -             0.0            0.000         0:0.000       false          true

[arthas@22336]$ thread 15
"Thread-1" Id=15 BLOCKED on arthas.MyTask@7253ba6b owned by "Thread-0" Id=14
    at arthas.MyTask.run(ArthasTest.java:19)
    -  blocked on arthas.MyTask@7253ba6b
    at java.lang.Thread.run(Thread.java:748)

thread -b找出當前阻塞其他線程的線程。可以看到 Thread-0 阻塞了其他一個線程

Thread 查看線程狀態(tài)可以看到ID為15的Thread-1處于阻塞狀態(tài)。

Thread 15 查看具體的信息，可以看到當前阻塞的資源被哪個線程占有等情況。

3. jad 反編譯類信息

[arthas@28868]$ jad arthas.ArthasTest

ClassLoader:
+-sun.misc.Launcher$AppClassLoader@18b4aac2
  +-sun.misc.Launcher$ExtClassLoader@3af87f7

Location:
/E:/xiangmu/MvnPro/target/classes/

/*
 * Decompiled with CFR.
 */
package arthas;

public class ArthasTest {
    public static void main(String[] args) {
        System.out.println(Thread.currentThread().getName());
        String test = System.getProperty("test");
        while (true) {
            String test2;
            if ((test2 = System.getProperty("test")) == null || test2.equals(test)) {
                continue;
            }
            System.out.println(test2);
            test = test2;
        }
    }
}

4.開啟保存日志

options 查看配置，相當于查看arthas內(nèi)置的全局配置屬性

options save-result true 開啟保存日志。會保存到{user}/logsarthas-cache/result.log 中

5.退出

如果只是退出當前的連接，可以用quit或者exit命令。Attach到目標進程上的arthas還會繼續(xù)運行，端口會保持開放，下次連接時可以直接連接上。

如果想完全退出arthas，可以執(zhí)行stop命令。

3. 實操

1. 修改以及查看JVM的環(huán)境變量和JVM的系統(tǒng)屬性

sysenv 查看JVM的環(huán)境變量
sysprop 查看JVM的所有的系統(tǒng)屬性
sysprop java.version 查看單個系統(tǒng)的屬性
sysprop user.country US 修改user.country 屬性的值為US

比如上面修改test 屬性為 testValue，修改之后會被程序System.getProperty(key) 獲取到

[arthas@28868]$ sysprop  test testValue
Successfully changed the system property.
 KEY                               VALUE
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 test                              testValue
[arthas@28868]$ sysprop  test
 KEY                               VALUE
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 test                              testValue

我們到IDEA查看main線程打出的信息：testValue

2. 監(jiān)視方法的執(zhí)行時長以及方法的返回值

比如如下簡單的Controller和Service：

controller：

package com.xm.ggn.controller;

import com.xm.ggn.service.common.MessageService2;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {

    @Value("${test:defaultValue}")
    private String test;

    @RequestMapping("test")
    public String test() {
        return test;
    }

    @Autowired
    private MessageService2 messageService;

    @RequestMapping("tx1")
    public void tx1() {
        messageService.tx1();
    }

    @RequestMapping("tx2")
    public void tx2() {
        messageService.tx2();
    }

    @RequestMapping("tx4")
    public void tx4() {
        messageService.tx4();
    }

}

service：

package com.xm.ggn.service.common;

public interface MessageService2 {

    void tx1();

    void tx2();

    void tx3();

    void tx4();
}

serviceimpl：

package com.xm.ggn.service.common.impl;

import com.xm.ggn.bean.common.Message;
import com.xm.ggn.mapper.common.MessageMapper;
import com.xm.ggn.service.common.MessageService2;
import org.springframework.aop.framework.AopContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.transaction.Transactional;

@Service
//@Transactional
public class MessageService2Impl implements MessageService2 {

    @Autowired
    private MessageMapper messageMapper;

    @Override
    @Transactional
    public void tx1() {
        // 調(diào)用tx3方法會回滾，因為這里有事務(wù)直接，會走代理，且tx3方法會加入本事務(wù)
        tx3();
    }

    @Override
    public void tx2() {
        try {
            Thread.sleep(1 * 1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        // 調(diào)用tx3方法不會回滾，因為這里沒有事務(wù)。即使tx3有事務(wù)也不會走代理，因為通過內(nèi)部方法調(diào)用不會走代理。解決辦法查看tx4 方法
        tx3();
    }

    @Override
    @Transactional
    public void tx3() {
        Message message = new Message();
        message.setTitle("tx3");
        messageMapper.insert(message);

        int i = 1 / 0;
    }

    //  這樣進行方法內(nèi)部調(diào)用AOP會生效，主啟動類加@EnableAspectJAutoProxy(proxyTargetClass = true, exposeProxy = true) 注解
    @Override
    public void tx4() {
        MessageService2 messageService = (MessageService2) AopContext.currentProxy();
        // 這樣調(diào)用tx3會進行回滾，走的是代理類的方法
        messageService.tx3();
    }
}

啟動應(yīng)用后啟動arthas并且監(jiān)視對應(yīng)進程

1. 搜索類以及反編譯查看AOP增強的類

1. 搜索：模糊搜索

[arthas@13232]$ sc *.MessageService2
com.xm.ggn.service.common.MessageService2
com.xm.ggn.service.common.impl.MessageService2Impl
com.xm.ggn.service.common.impl.MessageService2Impl$$EnhancerBySpringCGLIB$$7fa3a2fc
Affect(row-cnt:3) cost in 56 ms.

如果查看加載的所有類，可以用：

sc *

2. 反編譯查看AOP增強的類

[arthas@13232]$ jad com.xm.ggn.service.common.impl.MessageService2Impl$$EnhancerBySpringCGLIB$$7fa3a2fc

ClassLoader:
+-sun.misc.Launcher$AppClassLoader@18b4aac2
  +-sun.misc.Launcher$ExtClassLoader@3c22fc4c

Location:
/E:/xiangmu/bs-media/media-server/target/classes/

/*
 * Decompiled with CFR.
 *
 * Could not load the following classes:
 *  com.xm.ggn.service.common.impl.MessageService2Impl
 */
package com.xm.ggn.service.common.impl;

import com.xm.ggn.service.common.impl.MessageService2Impl;
import java.lang.reflect.Method;
import org.aopalliance.aop.Advice;
import org.springframework.aop.Advisor;
import org.springframework.aop.SpringProxy;
import org.springframework.aop.TargetClassAware;
import org.springframework.aop.TargetSource;
import org.springframework.aop.framework.Advised;
import org.springframework.aop.framework.AopConfigException;
import org.springframework.cglib.core.ReflectUtils;
import org.springframework.cglib.core.Signature;
import org.springframework.cglib.proxy.Callback;
import org.springframework.cglib.proxy.Dispatcher;
import org.springframework.cglib.proxy.Factory;
import org.springframework.cglib.proxy.MethodInterceptor;
import org.springframework.cglib.proxy.MethodProxy;
import org.springframework.cglib.proxy.NoOp;

public class MessageService2Impl$$EnhancerBySpringCGLIB$$7fa3a2fc
extends MessageService2Impl
implements SpringProxy,
Advised,
Factory {
    private boolean CGLIB$BOUND;
    public static Object CGLIB$FACTORY_DATA;
    ...
}

2. 檢測方法的執(zhí)行時長： trace

比如檢測：com.xm.ggn.controller.TestController 類的所有方法，如下：

[arthas@13232]$ trace com.xm.ggn.controller.TestController *
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 5) cost in 93 ms, listenerId: 1
`---ts=2021-01-12 21:15:57;thread_name=http-nio-8088-exec-1;id=108;is_daemon=true;priority=5;TCCL=org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader@3ee39a1c
    `---[45.0785ms] com.xm.ggn.controller.TestController:tx4() [throws Exception]
        +---[44.0299ms] com.xm.ggn.service.common.MessageService2:tx4() #40 [throws Exception]
        `---throw:java.lang.ArithmeticException #39 [/ by zero]

　　trace還有好幾個參數(shù)可以過濾以及支持檢測多個類的多個方法以及根據(jù)時長過濾等

補充：用trace命令檢測多個類的多個方法，形成調(diào)用鏈檢測

比如如下

(1) Service1

package com.xm.ggn.test.arthas;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

/**
 * @author: 喬利強
 * @date: 2021/2/7 14:37
 * @description:
 */
@Service
@Slf4j
public class ArthasTestService {

    @Autowired
    private ArthasTestService2 arthasTestService2;

    public void method1() {
        log.debug("method1");
        try {
            TimeUnit.SECONDS.sleep(1);
        } catch (InterruptedException ignore) {
        }

        this.method2();
        this.method3();
    }


    public void method2() {
        log.debug("method2");
        try {
            TimeUnit.SECONDS.sleep(2);
        } catch (InterruptedException ignore) {
        }

        arthasTestService2.method1();
        arthasTestService2.method2();
    }

    public void method3() {
        log.debug("method3");
        try {
            TimeUnit.SECONDS.sleep(3);
        } catch (InterruptedException ignore) {
        }
    }

}

(2)Service2

package com.xm.ggn.test.arthas;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

/**
 * @author: 喬利強
 * @date: 2021/2/7 14:37
 * @description:
 */
@Service
@Slf4j
public class ArthasTestService2 {

    public void method1() {
        log.debug("method1");
        try {
            TimeUnit.SECONDS.sleep(1);
        } catch (InterruptedException ignore) {
        }
    }

    public void method2() {
        log.debug("method2");
        try {
            TimeUnit.SECONDS.sleep(2);
        } catch (InterruptedException ignore) {
        }
    }
}

(3)Controller

package com.xm.ggn.test.arthas;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author: 喬利強
 * @date: 2021/2/7 14:34
 * @description:
 */
@RestController
@RequestMapping("/arthas")
public class ArthasTestCcontroller {

    @Autowired
    private ArthasTestService arthasTestService;

    @GetMapping("testTrace")
    public void testTrace() {
        arthasTestService.method1();
    }
}

(4)測試：

1》trace檢測單個類，結(jié)果如下：可以看到?jīng)]監(jiān)測ArthasTestService2 內(nèi)部調(diào)用時長

[arthas@28892]$ sc *.ArthasTestService*
com.xm.ggn.test.arthas.ArthasTestService
com.xm.ggn.test.arthas.ArthasTestService2
Affect(row-cnt:2) cost in 50 ms.
[arthas@28892]$ trace com.xm.ggn.test.arthas.ArthasTestService *
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 4) cost in 83 ms, listenerId: 1
`---ts=2021-02-07 19:32:08;thread_name=http-nio-8088-exec-1;id=12e;is_daemon=true;priority=5;TCCL=org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader@87060c0
    `---[9003.109599ms] com.xm.ggn.test.arthas.ArthasTestService:method1()
        +---[0.035ms] org.slf4j.Logger:debug() #22
        +---[5002.6882ms] com.xm.ggn.test.arthas.ArthasTestService:method2() #28
        |   `---[5002.1293ms] com.xm.ggn.test.arthas.ArthasTestService:method2()
        |       +---[0.008ms] org.slf4j.Logger:debug() #34
        |       +---[1000.8634ms] com.xm.ggn.test.arthas.ArthasTestService2:method1() #40
        |       `---[2000.6096ms] com.xm.ggn.test.arthas.ArthasTestService2:method2() #41
        `---[3000.115601ms] com.xm.ggn.test.arthas.ArthasTestService:method3() #29
            `---[3000.07ms] com.xm.ggn.test.arthas.ArthasTestService:method3()
                `---[0.007ms] org.slf4j.Logger:debug() #45

2》監(jiān)測兩個類的多個方法：可以看到也監(jiān)測了ArthasTestService2的相關(guān)方法

[arthas@28892]$ trace -E com.xm.ggn.test.arthas.ArthasTestService|com.xm.ggn.test.arthas.ArthasTestService2 method1|method2|method3
Press Q or Ctrl+C to abort.
Affect(class count: 2 , method count: 5) cost in 122 ms, listenerId: 3
`---ts=2021-02-07 19:34:51;thread_name=http-nio-8088-exec-4;id=131;is_daemon=true;priority=5;TCCL=org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader@87060c0
    `---[9002.5463ms] com.xm.ggn.test.arthas.ArthasTestService:method1()
        +---[0.0627ms] org.slf4j.Logger:debug() #22
        +---[5001.5262ms] com.xm.ggn.test.arthas.ArthasTestService:method2() #28
        |   `---[5001.484ms] com.xm.ggn.test.arthas.ArthasTestService:method2()
        |       +---[0.008101ms] org.slf4j.Logger:debug() #34
        |       +---[1000.377399ms] com.xm.ggn.test.arthas.ArthasTestService2:method1() #40
        |       |   `---[1000.288999ms] com.xm.ggn.test.arthas.ArthasTestService2:method1()
        |       |       `---[0.0178ms] org.slf4j.Logger:debug() #18
        |       `---[2000.178ms] com.xm.ggn.test.arthas.ArthasTestService2:method2() #41
        |           `---[2000.134ms] com.xm.ggn.test.arthas.ArthasTestService2:method2()
        |               `---[0.0112ms] org.slf4j.Logger:debug() #26
        `---[3000.27ms] com.xm.ggn.test.arthas.ArthasTestService:method3() #29
            `---[3000.235499ms] com.xm.ggn.test.arthas.ArthasTestService:method3()
                `---[0.007101ms] org.slf4j.Logger:debug() #45

　　這里暫時沒找到監(jiān)測兩個類或多個類所有方法的套路~~~

結(jié)果解釋：

(1)[5001.5262ms] com.xm.ggn.test.arthas.ArthasTestService:method2() #28當前節(jié)點在當前步驟的耗時，單位為毫秒。 #28 表示在源文件的第28行。

(2)還有另一種寫法：[min=0.020435ms,max=0.022325ms,total=0.04276ms,count=2] org.springframework.util.Assert:isTrue() #95表示對該方法中相同的方法調(diào)用進行了合并。比如：

if ("1".equals(a) && "2".equals(b)) {

　　// doXXX

}

3.查看某個類調(diào)用過程中的返回值：比如觀察方法出參和返回值 watch

[arthas@19792]$ watch com.xm.ggn.controller.TestController * "{params,returnObj}"
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 5) cost in 79 ms, listenerId: 3
method=com.xm.ggn.controller.TestController.test location=AtExit
ts=2021-01-12 21:32:16; [cost=0.0674ms] result=@ArrayList[
    @Object[][isEmpty=true;size=0],
    @String[defaultValue],
]

調(diào)用一次test 方法之后結(jié)果如上。可以看到參數(shù)為空，返回值是一個String值為"defaultValue"。

這個結(jié)果可能不太明顯，增加一個測試用例：

(1)Controller增加一個方法：

    @RequestMapping("testMap")
    public Map test(String key1, String key2) {
        HashMap<String, Object> stringObjectHashMap = new HashMap<>();
        stringObjectHashMap.put(key1, key1);
        stringObjectHashMap.put(key2, key2);
        return stringObjectHashMap;
    }

(2)arthas檢測： -x指定輸出結(jié)果的屬性遍歷深度，默認為 1

[arthas@27848]$ watch com.xm.ggn.controller.TestController * "{params,returnObj}" -x 3
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 6) cost in 38 ms, listenerId: 5

(3)訪問：

http://localhost:8088/testMap?key1=111&key2=222

(4)arthas控制臺輸出

method=com.xm.ggn.controller.TestController.test location=AtExit
ts=2021-01-12 21:40:26; [cost=0.0351ms] result=@ArrayList[
    @Object[][
        @String[111],
        @String[222],
    ],
    @HashMap[
        @String[111]:@String[111],
        @String[222]:@String[222],
    ],
]

補充：第一次運行jar包選擇進程進入的時候會自動從互聯(lián)網(wǎng)下載幾個依賴包，自動放在 ${user}/.arthas/lib。如果是離線環(huán)境可以將lib下面的包傳到離線的服務(wù)器，啟動的時候指定路徑：如下：

java -jar arthas-boot.jar --arthas-home C:UsersqlqDesktopplaintoolsarthaslib3.4.5arthas

--arthas-home 指定依賴包的路徑

補充：Arthas目前支持Web Console，用戶在attach成功之后，可以直接訪問：http://127.0.0.1:3658/。默認情況下，arthas只listen 127.0.0.1，所以如果想從遠程連接，則可以使用--target-ip參數(shù)指定listen的IP，更多參考-h的幫助說明。

補充：logger查看以及修改日志級別

[arthas@11520]$ logger　　#查看日志級別
 name                ROOT
 class               ch.qos.logback.classic.Logger
 classLoader         sun.misc.Launcher$AppClassLoader@18b4aac2
 classLoaderHash     18b4aac2
 level               INFO
 effectiveLevel      INFO
 additivity          true
 codeSource          file:/E:/Maven/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
 appenders           name            CONSOLE
                     class           ch.qos.logback.core.ConsoleAppender
                     classLoader     sun.misc.Launcher$AppClassLoader@18b4aac2
                     classLoaderHash 18b4aac2
                     target          System.out

[arthas@11520]$ logger --name ROOT --level debug　　#修改日志級別
Update logger level success.
[arthas@11520]$ logger　　#查看日志級別
 name                ROOT
 class               ch.qos.logback.classic.Logger
 classLoader         sun.misc.Launcher$AppClassLoader@18b4aac2
 classLoaderHash     18b4aac2
 level               DEBUG
 effectiveLevel      DEBUG
 additivity          true
 codeSource          file:/E:/Maven/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
 appenders           name            CONSOLE
                     class           ch.qos.logback.core.ConsoleAppender
                     classLoader     sun.misc.Launcher$AppClassLoader@18b4aac2
                     classLoaderHash 18b4aac2
                     target          System.out

補充：sc 也可以查看類以及靜態(tài)變量的信息，如下：

[arthas@9432]$  sc -d -f com.xm.ggn.test.FieldTest
 class-info        com.xm.ggn.test.FieldTest
 code-source       /E:/xiangmu/bs-media/media-server/target/classes/
 name              com.xm.ggn.test.FieldTest
 isInterface       false
 isAnnotation      false
 isEnum            false
 isAnonymousClass  false
 isArray           false
 isLocalClass      false
 isMemberClass     false
 isPrimitive       false
 isSynthetic       false
 simple-name       FieldTest
 modifier          public
 annotation
 interfaces
 super-class       +-java.lang.Object
 class-loader      +-sun.misc.Launcher$AppClassLoader@18b4aac2
                     +-sun.misc.Launcher$ExtClassLoader@707ed9b0
 classLoaderHash   18b4aac2
 fields            name     test
                   type     java.lang.String
                   modifier final,public,static
                   value    123

                   name     name
                   type     java.lang.String
                   modifier private

也可以使用ognl獲取靜態(tài)變量：

[arthas@9432]$ ognl '@com.xm.ggn.test.FieldTest@test'
@String[123]

總結(jié)

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