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spring_day01 demo代码

發(fā)布時(shí)間：2024/3/12 编程问答 32 豆豆

生活随笔收集整理的這篇文章主要介紹了 spring_day01 demo代码小編覺(jué)得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.

本博客為這篇博客的輔助博客，主要是其中自己寫的一些Demo.java代碼

日志的用法

Demo1.java

log4j.properties

控制反轉(zhuǎn)IOC的測(cè)試

Demo2.java

applicationContext.xml1

UserService.java

UserServiceImpl.java

依賴注入

CustomerDaoImpl.java

CustomerServiceImpl.java

Demo3.java

applicationContext.xml2

依賴注入的方式2:構(gòu)造方法

Car1.java

Person.java

Demo4.java

applicationContext.xml3

依賴注入方式3:p名稱空間的注入（純了解即可）

Car2.java

applicationContext.xml4

Demo4.java1

數(shù)組，集合(List,Set,Map)，Properties等的注入

User.java

applicationContext.xml5

Demo4.java3

Spring框架的配置文件分開(kāi)管理（了解）

applicationContext.xml

applicationContext2.xml

Demo4.java4

Spring框架整合WEB(簡(jiǎn)單的Struts整合)

CustomerDao.java

CustomerDaoImpl.java

CustomerService.java

CustomerServiceImpl.java

CustomerAction.java

struts.xml

applicationContext.xml(ZH)

導(dǎo)包:spring-web-4.2.4.RELEASE.jar（spring依賴包）

web.xml

固定配置:

?

日志的用法

Demo1.java

package com.itheima.demo1; import org.apache.log4j.Logger; import org.junit.Test; /*** 演示日志用法* @author Administrator**/ public class Demo1 {//創(chuàng)建日志對(duì)象private Logger log=Logger.getLogger(Demo1.class);@Testpublic void run1(){System.out.println("執(zhí)行了...");log.info("執(zhí)行了...");} }

log4j.properties

### direct log messages to stdout ### log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.err log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n### direct messages to file mylog.log ### log4j.appender.file=org.apache.log4j.FileAppender log4j.appender.file.File=c\:mylog.log log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n### set log levels - for more verbose logging change 'info' to 'debug' ###### 在此配置文件里將inof改為off 則，所有的日志輸出都會(huì)失效，就像全部被注釋了一樣 ### 日志文件是spring依賴包里拷貝進(jìn)來(lái)的，默認(rèn)值就是info log4j.rootLogger=info, stdout

控制反轉(zhuǎn)IOC的測(cè)試

Demo2.java

package com.itheima.demo2;import org.junit.Test; import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.xml.XmlBeanFactory; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.core.io.ClassPathResource;/*** 測(cè)試IOC程序* @author Administrator**/ public class Demo2 {/*** 原來(lái)的方式*/@Testpublic void run1(){//創(chuàng)建實(shí)現(xiàn)類//UserServiceImpl usi = new UserServiceImpl();//usi.sayHello();UserService us=new UserServiceImpl();us.sayHello();}/*** 使用的是Spring框架的方式*/@Testpublic void run2(){//創(chuàng)建工廠，加載核心配置文件ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");//一讀取配置文件，你配置的對(duì)象就全幫你配置完了//從工廠中獲取對(duì)象參數(shù)就寫配置的id值UserService us = (UserService) ac.getBean("userService");//一般都強(qiáng)轉(zhuǎn)為接口寫接口拓展容易接口可以有多個(gè)實(shí)現(xiàn)類都能被賦值//調(diào)用對(duì)象方法執(zhí)行us.sayHello();}/*** 老的工廠版本過(guò)時(shí)了不推薦用* BeanFactory*/@Testpublic void run4(){//創(chuàng)建工廠，加載核心配置文件BeanFactory factory =new XmlBeanFactory(new ClassPathResource("applicationContext.xml"));//從工廠中獲取對(duì)象UserService us = (UserService) factory.getBean("userService");//老工廠 getBean時(shí)才會(huì)創(chuàng)建//調(diào)用對(duì)象的方法執(zhí)行us.sayHello(); }/*** 演示銷毀方法(了解)*/@Testpublic void run5(){//創(chuàng)建工廠，加載核心配置文件ClassPathXmlApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");//一讀取配置文件，你配置的對(duì)象就全幫你配置完了//從工廠中獲取對(duì)象參數(shù)就寫配置的id值UserService us = (UserService) ac.getBean("userService");//一般都強(qiáng)轉(zhuǎn)為接口寫接口拓展容易接口可以有多個(gè)實(shí)現(xiàn)類都能被賦值//調(diào)用對(duì)象方法執(zhí)行us.sayHello(); //關(guān)閉工廠里面的對(duì)象會(huì)全部銷毀ac.close();}//依賴注入入門演示/*** 原始方式*/@Testpublic void run6_0(){//創(chuàng)建實(shí)現(xiàn)類UserServiceImpl usi = new UserServiceImpl();usi.setName("云天河");usi.sayHello();}/*** 依賴注入 : 不用set屬性值直接配置屬性值*/@Testpublic void run6(){//創(chuàng)建工廠，加載核心配置文件ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");//一讀取配置文件，你配置的對(duì)象就全幫你配置完了//從工廠中獲取對(duì)象參數(shù)就寫配置的id值UserService us = (UserService) ac.getBean("userService");//一般都強(qiáng)轉(zhuǎn)為接口寫接口拓展容易接口可以有多個(gè)實(shí)現(xiàn)類都能被賦值//調(diào)用對(duì)象方法執(zhí)行us.sayHello();}}

applicationContext.xml1

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean id="userService" class="com.itheima.demo2.UserServiceImpl"><property name="name" value="云天河" /></bean></beans>

UserService.java

package com.itheima.demo2;public interface UserService {public void sayHello(); }

UserServiceImpl.java

package com.itheima.demo2;public class UserServiceImpl implements UserService {private String name;public void setName(String name) {this.name = name;}@Overridepublic void sayHello() {System.out.println("hello spring!! "+name);}//創(chuàng)建對(duì)象之前框架會(huì)先調(diào)用init方法(前提配置了)public void init(){System.out.println("UserServiceImpl創(chuàng)建了...");}//銷毀時(shí)調(diào)用此方法public void destory(){System.out.println("UserServiceImpl銷毀了...");}}

依賴注入

（也是最常用的一種方式即set屬性方式）

CustomerDaoImpl.java

package com.itheima.demo3;public class CustomerDaoImpl {public void save(){System.out.println("我是持久層的dao....");} }

CustomerServiceImpl.java

package com.itheima.demo3;public class CustomerServiceImpl {//不準(zhǔn)new了，那么必須要提供成員屬性讓框架幫你封裝了//提供成員屬性，提供set方法 (此類需要用到dao，這就是依賴)private CustomerDaoImpl customerDao;public void setCustomerDao(CustomerDaoImpl customerDao) {this.customerDao = customerDao;}public void save() {System.out.println("我是業(yè)務(wù)層的service.....");//原始的方式//new CustomerDaoImpl().save();//spring的方式customerDao.save();} }

Demo3.java

package com.itheima.demo3;import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;public class Demo3 {/*** 原始方法*/@Testpublic void run1(){CustomerServiceImpl cs = new CustomerServiceImpl();cs.save();}/*** spring方式*/@Testpublic void run2(){ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");CustomerServiceImpl cs = (CustomerServiceImpl) ac.getBean("customerService");cs.save();} }

applicationContext.xml2

依賴注入的方式2:構(gòu)造方法

注意普通屬性值參數(shù)用value,引用其他類對(duì)象則用ref

Car1.java

package com.itheima.demo4;public class Car1 {private String name;private Double price;//public Cart() {}//注意沒(méi)有空參構(gòu)造方法配置時(shí)必須提供參數(shù)public Car1(String name, Double price) {super();this.name = name;this.price = price;}@Overridepublic String toString() {return "Car1 [name=" + name + ", price=" + price + "]";}}

Person.java

package com.itheima.demo4;public class Person {private String name;private Car1 car1;//沒(méi)有內(nèi)存的引用配置時(shí)不能寫value 要寫refpublic Person(String name, Car1 car1) {super();this.name = name;this.car1 = car1;}@Overridepublic String toString() {return "Person [name=" + name + ", car1=" + car1 + "]";}}

Demo4.java

package com.itheima.demo4;import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;public class Demo4 {/*** 通過(guò)構(gòu)造方法實(shí)現(xiàn)注入用得不多標(biāo)準(zhǔn)用法是set方法*/@Testpublic void run1(){ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");Car1 car1=(Car1) ac.getBean("car1");System.out.println(car1);}//補(bǔ)上引用的配置@Testpublic void run2(){ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");Person person=(Person) ac.getBean("person");System.out.println(person);}/*** 重復(fù)寫一個(gè)set方法注入方式以強(qiáng)調(diào)這是標(biāo)準(zhǔn)的注入方式*/@Testpublic void run3(){ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");Car2 car2= (Car2) ac.getBean("car2");System.out.println(car2);}}

applicationContext.xml3

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><bean id="car1" class="com.itheima.demo4.Car1"><constructor-arg index="0" value="奇瑞QQ2"/><constructor-arg index="1" value="50000"/></bean><bean id="person" class="com.itheima.demo4.Person"><constructor-arg name="name" value="天河"/><constructor-arg name="car1" ref="car1"/></bean> <bean id="car2" class="com.itheima.demo4.Car2"><property name="name" value="飛車"/><property name="price" value="99999"/></bean></beans>

?

依賴注入方式3:p名稱空間的注入（純了解即可）

Car2.java

package com.itheima.demo4;public class Car2 {private String name;private Double price;public String getName() {return name;}public void setName(String name) {this.name = name;}public Double getPrice() {return price;}public void setPrice(Double price) {this.price = price;}//方法多了沒(méi)事少了不行@Overridepublic String toString() {return "Car2 [name=" + name + ", price=" + price + "]";}}

applicationContext.xml4

Demo4.java1

@Testpublic void run3(){ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");Car2 car2= (Car2) ac.getBean("car2");System.out.println(car2);}

?

數(shù)組，集合(List,Set,Map)，Properties等的注入

自己寫的不多，但是三大框架整合時(shí)需要用到這些配置

User.java

package com.itheima.demo4;import java.util.Arrays; import java.util.List; import java.util.Map; import java.util.Properties;public class User {private String[] arrs;public void setArrs(String[] arrs) {this.arrs = arrs;}private List<String> list;public void setList(List<String> list) {this.list = list;}private Map<String, String> map;public void setMap(Map<String, String> map) {this.map = map;}private Properties pro;//java.utils包下的屬性文件類public void setPro(Properties pro) {this.pro = pro;}@Overridepublic String toString() {return "User [arrs=" + Arrays.toString(arrs) + ", list=" + list+ ", map=" + map + ", pro=" + pro + "]";} }

applicationContext.xml5

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><bean id="user" class="com.itheima.demo4.User"><property name="arrs"><list><value>天河</value><value>紫英</value><value>夢(mèng)璃</value><value>菱紗</value></list></property><property name="list"><list><value>玄霄</value><value>天青</value><value>夙玉</value></list></property><property name="map"><map><entry key="a" value="蘋果"/> <entry key="b" value="香蕉"/> </map></property><property name="pro"><props><prop key="username">root</prop><prop key="password">1234</prop></props></property></bean></beans>

Demo4.java3

package com.itheima.demo4;import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;public class Demo4 { /*** 測(cè)試注入集合*/@Testpublic void run4(){ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");User user= (User) ac.getBean("user");System.out.println(user);}}

Spring框架的配置文件分開(kāi)管理（了解）

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><import resource="applicationContext2.xml"/></beans>

applicationContext2.xml

Demo4.java4

package com.itheima.demo4;import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;public class Demo4 {/*** 測(cè)試配置文件分模塊管理*/@Testpublic void run4(){ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");User user= (User) ac.getBean("user");System.out.println(user);}/*** 可以直接加載多個(gè)多個(gè)配置文件此時(shí)就不必在主配置文件中引入其他配置文件了* 但是要是真的有多個(gè)配置文件還是建議引入而不寫這種代碼 (傾向于在配置文件中寫)*/@Testpublic void run5(){ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml","applicationContext2.xml");User user= (User) ac.getBean("user");System.out.println(user);}}

Spring框架整合WEB(簡(jiǎn)單的Struts整合)

主要解決apllication.xml配置文件如何只加載一次的問(wèn)題

先搭建struts2環(huán)境（核心過(guò)濾器別忘了），再搭建spring最簡(jiǎn)單的環(huán)境(6個(gè)包)

CustomerDao.java

package com.itheima.dao;public interface CustomerDao {public void save(); }

CustomerDaoImpl.java

package com.itheima.dao;import com.itheima.service.CustomerService;public class CustomerDaoImpl implements CustomerService{@Overridepublic void save() {System.out.println("持久層:保存客戶...");}}

CustomerService.java

package com.itheima.service;public interface CustomerService {public void save(); }

CustomerServiceImpl.java

package com.itheima.service;import com.itheima.dao.CustomerDaoImpl;public class CustomerServiceImpl implements CustomerService {private CustomerDaoImpl customerDao;public void setCustomerDao(CustomerDaoImpl customerDao) {this.customerDao = customerDao;}@Overridepublic void save() {System.out.println("業(yè)務(wù)層:保存客戶...");customerDao.save();}}

CustomerAction.java

package com.itheima.web.action;import javax.servlet.ServletContext;import org.apache.struts2.ServletActionContext; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.web.context.WebApplicationContext; import org.springframework.web.context.support.WebApplicationContextUtils;import com.itheima.service.CustomerService; import com.opensymphony.xwork2.ActionSupport;/*** 客戶的Action* @author Administrator**/ public class CustomerAction extends ActionSupport{//spring學(xué)完后實(shí)戰(zhàn)之前將所有博客和代碼讀一遍復(fù)習(xí)一下下最好有個(gè)小總結(jié) 簡(jiǎn)單復(fù)習(xí)而已不要苛求什么/*** 保存客戶* @return*/public String save(){System.out.println("WEB層保存客戶...");/*//使用工廠這樣寫每次請(qǐng)求action都會(huì)加載一次配置文件，也即都會(huì)創(chuàng)建一個(gè)工廠，很明顯這不合適這個(gè)時(shí)候就需要整合操作了ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");CustomerService cs= (CustomerService) ac.getBean("customerService");cs.save();return NONE;*//*** 那么需要導(dǎo)包 spring-web... 然后監(jiān)聽(tīng)ServletContext類(最大的全局共享域)* 這個(gè)類是在服務(wù)器開(kāi)啟時(shí)創(chuàng)建，關(guān)閉時(shí)銷毀* 有個(gè)專門的監(jiān)聽(tīng)器是監(jiān)聽(tīng)這個(gè)類的創(chuàng)建和銷毀的* * 過(guò)程如下:啟動(dòng)服務(wù)器->ServletContext對(duì)象被創(chuàng)建->ServletContext監(jiān)聽(tīng)器對(duì)象方法執(zhí)行->在監(jiān)聽(tīng)器里執(zhí)行加載配置文件的代碼* ->那么配置文件只會(huì)加載一次，里面所有的類對(duì)象也都創(chuàng)建好了* * spring-web-4.2.4.RELEASE.jar包里就有監(jiān)聽(tīng)器配置一下即可*///解決方案:需要使用web的工廠方式//action里獲得servletContext有個(gè)好值棧啊ServletContext servletContext = ServletActionContext.getServletContext();//獲得web工廠WebApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(servletContext);//利用web工廠獲得對(duì)象CustomerService cs= (CustomerService)context.getBean("customerService");cs.save();return NONE;} }

struts.xml

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN""http://struts.apache.org/dtds/struts-2.3.dtd"><struts><package name="crm" namespace="/" extends="struts-default"><action name="customer_*" class="com.itheima.web.action.CustomerAction" method="{1}"/></package></struts>

applicationContext.xml(ZH)

導(dǎo)包:spring-web-4.2.4.RELEASE.jar（spring依賴包）

web.xml

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"><display-name>day35_crm</display-name><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:applicationContext.xml</param-value></context-param><filter><filter-name>struts2</filter-name><filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class></filter><filter-mapping><filter-name>struts2</filter-name><url-pattern>/*</url-pattern></filter-mapping><welcome-file-list><welcome-file>index.html</welcome-file><welcome-file>index.htm</welcome-file><welcome-file>index.jsp</welcome-file><welcome-file>default.html</welcome-file><welcome-file>default.htm</welcome-file><welcome-file>default.jsp</welcome-file></welcome-file-list> </web-app>

固定配置:

<listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:applicationContext.xml</param-value></context-param><filter><filter-name>struts2</filter-name><filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class></filter><filter-mapping><filter-name>struts2</filter-name><url-pattern>/*</url-pattern></filter-mapping>

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