FastJSON 應用前測試 FastJSON是一個很好的java開源json工具類庫，相比其他同類的json類庫，它的速度的確是fast，最快！但是文檔做得不好，在應用前不得不親測一些功能。 實際上其他的json處理工具都和它差不多，api也有幾分相似。 一、JSON規范 JSON是一個標準規范，用于數據交互，規范的中文文檔如下： http://www.json.org/json-zh.html 參看規范，來對比JSON類庫處理結果。 二、fastjson的一些簡要說明 1、了解fastjson Fastjson介紹 Fastjson是一個Java語言編寫的JSON處理器。
1、遵循http://json.org標準，為其官方網站收錄的參考實現之一。
2、功能qiang打，支持JDK的各種類型，包括基本的JavaBean、Collection、Map、Date、Enum、泛型。
3、無依賴，不需要例外額外的jar，能夠直接跑在JDK上。
4、開源，使用Apache License 2.0協議開源。http://code.alibabatech.com/wiki/display/FastJSON/Home 如果獲得Fastjson？
SVN:http://code.alibabatech.com/svn/fastjson/trunk/
WIKI:http://code.alibabatech.com/wiki/display/FastJSON/Home
Issue Tracking:http://code.alibabatech.com/jira/browse/FASTJSON 2、主要的使用入口 Fastjson API入口類是com.alibaba.fastjson.JSON，常用的序列化操作都可以在JSON類上的靜態方法直接完成。 public?static?final?Object parse(String text);?// 把JSON文本parse為JSONObject或者JSONArray?
public?static?final?JSONObject parseObject(String text)；?// 把JSON文本parse成JSONObject????
public?static?final?<T> T parseObject(String text, Class<T> clazz);?// 把JSON文本parse為JavaBean?
public?static?final?JSONArray parseArray(String text);?// 把JSON文本parse成JSONArray?
public?static?final?<T> List<T> parseArray(String text, Class<T> clazz);?//把JSON文本parse成JavaBean集合
public?static?final?String toJSONString(Object object);?// 將JavaBean序列化為JSON文本?
public?static?final?String toJSONString(Object object,?boolean?prettyFormat);?// 將JavaBean序列化為帶格式的JSON文本?
public?static?final?Object toJSON(Object javaObject); 將JavaBean轉換為JSONObject或者JSONArray。 3、有關類庫的一些說明 SerializeWriter：相當于StringBuffer JSONArray：相當于List<Object> JSONObject：相當于Map<String, Object> JSON反序列化沒有真正數組，本質類型都是List<Object> 4、fastjson還有很多很高級的特性，比如支持注解、支持全類型序列化，這些都是很好的特性，功能強大，不在本次測試范圍。 三、測試代碼 package?lavasoft.stu.json;?

import?com.alibaba.fastjson.JSON;?
import?com.alibaba.fastjson.serializer.SerializeConfig;?
import?com.alibaba.fastjson.serializer.SimpleDateFormatSerializer;?

import?java.util.*;?

/**?
* Created by IntelliJ IDEA.?
*?
* @author leizhimin 11-11-22 上午9:15?
*/?
public?class?Foo {?
????????private?String vString =?"vStringhehhehe";?
????????private?char?vchar = 'x';?

????????private?byte?vbyte = 64;?
????????private?short?vshort = 128;?
????????private?int?vint = 65535;?
????????private?long?vlong = 9999999L;?

????????private?float?vfloat = 12.1f;?
????????private?double?vdouble = 22.203d;?

????????private?boolean?vboolean =?false;?

//????????private Date vdate = new Date();?
????????private?Date dddd =?new?Date();?
????????private?Date vDate =?new?Date();?
????????private?Date v_Date =?new?Date();?
????????private?Object vnull =?null;?

????????private?String[] avString = {"aaa",?"bbb",?"ccc"};?
????????private?int[] avint = {1, 2, 3, 4};?
????????private?boolean[] avboolean = {true,?false,?true,?true};?

????????private?List<String> listString =?new?ArrayList<String>();?
????????private?Map<String, String> map =?new?HashMap<String, String>();?

????????private?Bar bar =?new?Bar();?
????????private?Bar[] avBar = {new?Bar(),?new?Bar()};?
????????private?List<Bar> listBar =?new?ArrayList<Bar>();?

????????{?
????????????????listString.add("listString1");?
????????????????listString.add("listString2");?
????????????????listString.add("listString3");?

????????????????map.put("x",?"s11111x");?
????????????????map.put("y",?"s22222y");?
????????????????map.put("z",?"s33333z");?

????????????????listBar.add(new?Bar());?
????????????????listBar.add(new?Bar());?
????????????????listBar.add(new?Bar());?
????????}?



????????public?String getvString() {?
????????????????return?vString;?
????????}?

????????public?void?setvString(String vString) {?
????????????????this.vString = vString;?
????????}?

????????public?char?getVchar() {?
????????????????return?vchar;?
????????}?

????????public?void?setVchar(char?vchar) {?
????????????????this.vchar = vchar;?
????????}?

????????public?byte?getVbyte() {?
????????????????return?vbyte;?
????????}?

????????public?void?setVbyte(byte?vbyte) {?
????????????????this.vbyte = vbyte;?
????????}?

????????public?short?getVshort() {?
????????????????return?vshort;?
????????}?

????????public?void?setVshort(short?vshort) {?
????????????????this.vshort = vshort;?
????????}?

????????public?int?getVint() {?
????????????????return?vint;?
????????}?

????????public?void?setVint(int?vint) {?
????????????????this.vint = vint;?
????????}?

????????public?long?getVlong() {?
????????????????return?vlong;?
????????}?

????????public?void?setVlong(long?vlong) {?
????????????????this.vlong = vlong;?
????????}?

????????public?float?getVfloat() {?
????????????????return?vfloat;?
????????}?

????????public?void?setVfloat(float?vfloat) {?
????????????????this.vfloat = vfloat;?
????????}?

????????public?double?getVdouble() {?
????????????????return?vdouble;?
????????}?

????????public?void?setVdouble(double?vdouble) {?
????????????????this.vdouble = vdouble;?
????????}?

????????public?boolean?isVboolean() {?
????????????????return?vboolean;?
????????}?

????????public?void?setVboolean(boolean?vboolean) {?
????????????????this.vboolean = vboolean;?
????????}?

????????public?Date getDddd() {?
????????????????return?dddd;?
????????}?

????????public?void?setDddd(Date dddd) {?
????????????????this.dddd = dddd;?
????????}?

????????public?Date getV_Date() {?
????????????????return?v_Date;?
????????}?

????????public?void?setV_Date(Date v_Date) {?
????????????????this.v_Date = v_Date;?
????????}?

????????public?Date getvDate() {?
????????????????return?vDate;?
????????}?

????????public?void?setvDate(Date vDate) {?
????????????????this.vDate = vDate;?
????????}?

????????public?Object getVnull() {?
????????????????return?vnull;?
????????}?

????????public?void?setVnull(Object vnull) {?
????????????????this.vnull = vnull;?
????????}?

????????public?String[] getAvString() {?
????????????????return?avString;?
????????}?

????????public?void?setAvString(String[] avString) {?
????????????????this.avString = avString;?
????????}?

????????public?int[] getAvint() {?
????????????????return?avint;?
????????}?

????????public?void?setAvint(int[] avint) {?
????????????????this.avint = avint;?
????????}?

????????public?boolean[] getAvboolean() {?
????????????????return?avboolean;?
????????}?

????????public?void?setAvboolean(boolean[] avboolean) {?
????????????????this.avboolean = avboolean;?
????????}?

????????public?List<String> getListString() {?
????????????????return?listString;?
????????}?

????????public?void?setListString(List<String> listString) {?
????????????????this.listString = listString;?
????????}?

????????public?Map<String, String> getMap() {?
????????????????return?map;?
????????}?

????????public?void?setMap(Map<String, String> map) {?
????????????????this.map = map;?
????????}?

????????public?Bar getBar() {?
????????????????return?bar;?
????????}?

????????public?void?setBar(Bar bar) {?
????????????????this.bar = bar;?
????????}?

????????public?Bar[] getAvBar() {?
????????????????return?avBar;?
????????}?

????????public?void?setAvBar(Bar[] avBar) {?
????????????????this.avBar = avBar;?
????????}?

????????public?List<Bar> getListBar() {?
????????????????return?listBar;?
????????}?

????????public?void?setListBar(List<Bar> listBar) {?
????????????????this.listBar = listBar;?
????????}?
} package?lavasoft.stu.json;?

import?com.alibaba.fastjson.JSON;?
import?com.alibaba.fastjson.serializer.SerializeConfig;?
import?com.alibaba.fastjson.serializer.SimpleDateFormatSerializer;?

import?java.util.Date;?
import?java.util.Random;?

/**?
* Created by IntelliJ IDEA.?
*?
* @author leizhimin 11-11-22 上午9:15?
*/?
public?class?Bar {?
????????public?static?SerializeConfig mapping =?new?SerializeConfig();?
????????private?String barName;?
????????private?int?barAge;?
????????private?Date barDate =?new?Date();?
????????static?{?
????????????????mapping.put(Date.class,?new?SimpleDateFormatSerializer("yyyy-MM-dd"));?
????????}?
????????{?
????????????????Random r =?new?Random();?
????????????????barName =?"sss_"+String.valueOf(r.nextFloat());?
????????????????barAge = r.nextInt();?
????????}?

????????public?static?void?main(String[] args) {?
????????????????Object obj = JSON.toJSON(new?Bar());?
????????????????String x1 = JSON.toJSONString(new?Bar(),?true);?
????????????????System.out.println(x1);?
????????????????String x2 = JSON.toJSONString(new?Bar(), mapping);?
????????????????System.out.println(x2);?
????????}?

????????public?String getBarName() {?
????????????????return?barName;?
????????}?

????????public?void?setBarName(String barName) {?
????????????????this.barName = barName;?
????????}?

????????public?int?getBarAge() {?
????????????????return?barAge;?
????????}?

????????public?void?setBarAge(int?barAge) {?
????????????????this.barAge = barAge;?
????????}?

????????public?Date getBarDate() {?
????????????????return?barDate;?
????????}?

????????public?void?setBarDate(Date barDate) {?
????????????????this.barDate = barDate;?
????????}?

????????@Override?
????????public?String toString() {?
????????????????return?"Bar{"?+?
????????????????????????????????"barName='"?+ barName + '\'' +?
????????????????????????????????", barAge="?+ barAge +?
????????????????????????????????", barDate="?+ barDate +?
????????????????????????????????'}';?
????????}?
} package?lavasoft.stu.json;?

import?com.alibaba.fastjson.JSON;?
import?com.alibaba.fastjson.JSONArray;?
import?com.alibaba.fastjson.serializer.SerializeConfig;?
import?com.alibaba.fastjson.serializer.SimpleDateFormatSerializer;?

import?java.util.*;?

/**?
* Created by 2IntelliJ IDEA.?
*?
* @author leizhimin 11-11-22 上午9:45?
*/?
public?class?Test {?
????????private?static?SerializeConfig mapping =?new?SerializeConfig();?static?{?
????????????????mapping.put(Date.class,?new?SimpleDateFormatSerializer("yyyy-MM-dd HH:mm:ss"));?
????????}?

????????public?static?void?main(String[] args) {?
????????????????Foo f1 =?new?Foo();?
????????????????Date date =?new?Date();?
????????????????String text = JSON.toJSONString(date, mapping);?
????????????????System.out.println(text);?
????????????????System.out.println(JSON.toJSONString(f1,?true));?
????????????????String x2 =JSON.toJSONString(f1, mapping);?
????????????????System.out.println(x2);?
????????}?

????????public?static?void?json2List(){?
????????????????//List -> JSON array?
????????????????List<Bar> barList =?new?ArrayList<Bar>();?
????????????????barList.add(new?Bar());?
????????????????barList.add(new?Bar());?
????????????????barList.add(new?Bar());?
????????????????String json= JSON.toJSONString(barList,?true);?
????????????????System.out.println(json);?
????????????????//JSON array -> List?
????????????????List<Bar> barList1 = JSON.parseArray(json,Bar.class);?
????????????????for?(Bar bar : barList1) {?
????????????????????????System.out.println(bar.toString());?
????????????????}?
????????}?

????????public?static?void?json2Map(){?
????????????????//Map -> JSON?
????????????????Map<String,Bar> map =?new?HashMap<String, Bar>();?
????????????????map.put("a",new?Bar());?
????????????????map.put("b",new?Bar());?
????????????????map.put("c",new?Bar());?
????????????????String json = JSON.toJSONString(map,true);?
????????????????System.out.println(json);?
????????????????//JSON -> Map?
????????????????Map<String,Bar> map1 = (Map<String,Bar>)JSON.parse(json);?
????????????????for?(String key : map1.keySet()) {?
????????????????????????System.out.println(key+":"+map1.get(key));?
????????????????}?
????????}?

????????public?static?void?array2JSON(){?
????????????????String[] arr_String????= {"a","b","c"};?
????????????????String json_arr_String = JSON.toJSONString(arr_String,true);?
????????????????System.out.println(json_arr_String);?
????????????????JSONArray jsonArray = JSON.parseArray(json_arr_String);?
????????????????for?(Object o : jsonArray) {?
????????????????????????System.out.println(o);?
????????????????}?
????????????????System.out.println(jsonArray);?
????????}?
????????public?static?void?array2JSON2(){?
????????????????Bar[] arr_Bar????= {new?Bar(),new?Bar(),new?Bar()};?
????????????????String json_arr_Bar = JSON.toJSONString(arr_Bar,true);?
????????????????System.out.println(json_arr_Bar);?
????????????????JSONArray jsonArray = JSON.parseArray(json_arr_Bar);?
????????????????for?(Object o : jsonArray) {?
????????????????????????System.out.println(o);?
????????????????}?
????????????????System.out.println(jsonArray);?
????????}?

????????public?static?void?map2JSON(){?
????????????????Map map =?new?HashMap();?
????????????????map.put("a","aaa");?
????????????????map.put("b","bbb");?
????????????????map.put("c","ccc");?
????????????????String json=JSON.toJSONString(map);?
????????????????System.out.println(json);?
????????????????Map map1 = JSON.parseObject(json);?
????????????????for?(Object o : map.entrySet()) {?
????????????????????????Map.Entry<String,String> entry = (Map.Entry<String,String>)o;?
????????????????????????System.out.println(entry.getKey()+"--->"+entry.getValue());?
????????????????}?
????????}?
} 說明： SerializeConfig：是對序列化過程中一些序列化過程的特殊配置，這里用作日期格式的定義。 有關需要帶類型的全類型序列化過程，需要調用JSON.toJSONStringZ()方法。 需要美化輸出時候，需要打開序列化美化開關，在方法中true那個參數。 輸出結果： "2011-11-23 23:30:33"?
{?
??"avBar":[{?
????"barAge":174398800,?
????"barDate":1322062233062,?
????"barName":"sss_0.62378174"?
??},{?
????"barAge":38938962,?
????"barDate":1322062233062,?
????"barName":"sss_0.36014742"?
??}],?
??"avString":["aaa","bbb","ccc"],?
??"avboolean":[true,false,true,true],?
??"avint":[1,2,3,4],?
??"bar":{?
????"barAge":1601495948,?
????"barDate":1322062233062,?
????"barName":"sss_0.46644872"?
??},?
??"dddd":1322062233046,?
??"listBar":[?
????{?
??????"barAge":-1090113522,?
??????"barDate":1322062233062,?
??????"barName":"sss_0.83562374"?
????},?
????{?
??????"barAge":478603194,?
??????"barDate":1322062233062,?
??????"barName":"sss_0.59483266"?
????},?
????{?
??????"barAge":1118357669,?
??????"barDate":1322062233062,?
??????"barName":"sss_0.9961642"?
????}?
??],?
??"listString":[?
????"listString1",?
????"listString2",?
????"listString3"?
??],?
??"map":{"x":"s11111x","y":"s22222y","z":"s33333z"},?
??"v_Date":1322062233046,?
??"vboolean":false,?
??"vbyte":64,?
??"vchar":"x",?
??"vdouble":22.203,?
??"vfloat":12.1,?
??"vint":65535,?
??"vlong":9999999,?
??"vshort":128?
}?
{"avBar":[{"barAge":174398800,"barDate":"2011-11-23 23:30:33","barName":"sss_0.62378174"},{"barAge":38938962,"barDate":"2011-11-23 23:30:33","barName":"sss_0.36014742"}],"avString":["aaa","bbb","ccc"],"avboolean":[true,false,true,true],"avint":[1,2,3,4],"bar":{"barAge":1601495948,"barDate":"2011-11-23 23:30:33","barName":"sss_0.46644872"},"dddd":"2011-11-23 23:30:33","listBar":[{"barAge":-1090113522,"barDate":"2011-11-23 23:30:33","barName":"sss_0.83562374"},{"barAge":478603194,"barDate":"2011-11-23 23:30:33","barName":"sss_0.59483266"},{"barAge":1118357669,"barDate":"2011-11-23 23:30:33","barName":"sss_0.9961642"}],"listString":["listString1","listString2","listString3"],"map":{"x":"s11111x","y":"s22222y","z":"s33333z"},"v_Date":"2011-11-23 23:30:33","vboolean":false,"vbyte":64,"vchar":"x","vdouble":22.203,"vfloat":12.1,"vint":65535,"vlong":9999999,"vshort":128}?

Process finished with exit code 0? fastjson通過各方面測試都很好，功能性能都是No.1，喜歡，它的源代碼質量很高，作者也煞費苦心，將性能做到了最好，全免超越其他的json類庫。 從其中的源代碼中，可以學到很多東西，在閱讀源碼后，不得不佩服作者高超的程序設計水平，和高質量的編碼。 感謝alibaba對此工具開源。 fastjson-1.1.10-sources.jar 由于fastjson缺乏良好的api文檔，在閱讀源碼過程中，參考了網上一些文檔： http://code.alibabatech.com/wiki/display/FastJSON/Home http://www.ibm.com/developerworks/cn/education/java/j-generics/section5.html http://archive.cnblogs.com/a/1713531/ http://www.iflym.com/index.php/code/alibaba-fastjson-json-serializer-chapter-source-analyse-one-global-analyse.html http://www.cnblogs.com/hoojo/archive/2011/04/21/2023805.html http://archive.cnblogs.com/a/1713531/

本文出自 “熔 巖” 博客，請務必保留此出處http://lavasoft.blog.51cto.com/62575/723192

轉載于:https://www.cnblogs.com/davidwang456/p/4259368.html

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