爱华网FastJSON 应用前测试
FastJSON是一个很好的java开源json工具类库，相比其他同类的json类库，它的速度的确是fast，最快！但是文档做得不好，在应用前不得不亲测一些功能。
实际上其他的json处理工具都和它差不多，api也有几分相似。
一、JSON规范
JSON是一个标准规范，用于数据交互，规范的中文文档如下：
http://www.json.org/json-zh.html
参看规范，来对比JSON类库处理结果。
二、fastjson的一些简要说明
1、了解fastjson
Fastjson介绍
Fastjson是一个Java语言编写的JSON处理器。
1、遵循http://json.org标准，为其官方网站收录的参考实现之一。
2、功能qiang打，支持JDK的各种类型，包括基本的JavaBean、Collection、Map、Date、Enum、泛型。
3、无依赖，不需要例外额外的jar，能够直接跑在JDK上。
4、开源，使用Apache License 2.0协议开源。http://code.alibabatech.com/wiki/display/FastJSON/Home
如果获得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入口类是com.alibaba.fastjson.JSON，常用的序列化操作都可以在JSON类上的静态方法直接完成。
publicstaticfinalObject parse(String text);// 把JSON文本parse为JSONObject或者JSONArray
publicstaticfinalJSONObject parseObject(String text)；// 把JSON文本parse成JSONObject
publicstaticfinal<T> T parseObject(String text, Class<T> clazz);// 把JSON文本parse为JavaBean
publicstaticfinalJSONArray parseArray(String text);// 把JSON文本parse成JSONArray
publicstaticfinal<T> List<T> parseArray(String text, Class<T> clazz);//把JSON文本parse成JavaBean集合
publicstaticfinalString toJSONString(Object object);// 将JavaBean序列化为JSON文本
publicstaticfinalString toJSONString(Object object,booleanprettyFormat);// 将JavaBean序列化为带格式的JSON文本
publicstaticfinalObject toJSON(Object javaObject); 将JavaBean转换为JSONObject或者JSONArray。
3、有关类库的一些说明
SerializeWriter：相当于StringBuffer
JSONArray：相当于List<Object>
JSONObject：相当于Map<String, Object>
JSON反序列化没有真正数组，本质类型都是List<Object>
4、fastjson还有很多很高级的特性，比如支持注解、支持全类型序列化，这些都是很好的特性，功能强大，不在本次测试范围。
三、测试代码
packagelavasoft.stu.json;
importcom.alibaba.fastjson.JSON;
importcom.alibaba.fastjson.serializer.SerializeConfig;
importcom.alibaba.fastjson.serializer.SimpleDateFormatSerializer;
importjava.util.*;
/**
* Created by IntelliJ IDEA.
*
* @author leizhimin 11-11-22 上午9:15
*/
publicclassFoo {
privateString vString ="vStringhehhehe";
privatecharvchar = 'x';
privatebytevbyte = 64;
privateshortvshort = 128;
privateintvint = 65535;
privatelongvlong = 9999999L;
privatefloatvfloat = 12.1f;
privatedoublevdouble = 22.203d;
privatebooleanvboolean =false;
//private Date vdate = new Date();
privateDate dddd =newDate();
privateDate vDate =newDate();
privateDate v_Date =newDate();
privateObject vnull =null;
privateString[] avString = {"aaa","bbb","ccc"};
privateint[] avint = {1, 2, 3, 4};
privateboolean[] avboolean = {true,false,true,true};
privateList<String> listString =newArrayList<String>();
privateMap<String, String> map =newHashMap<String, String>();
privateBar bar =newBar();
privateBar[] avBar = {newBar(),newBar()};
privateList<Bar> listBar =newArrayList<Bar>();
{
listString.add("listString1");
listString.add("listString2");
listString.add("listString3");
map.put("x","s11111x");
map.put("y","s22222y");
map.put("z","s33333z");
listBar.add(newBar());
listBar.add(newBar());
listBar.add(newBar());
}
publicString getvString() {
returnvString;
}
publicvoidsetvString(String vString) {
this.vString = vString;
}
publicchargetVchar() {
returnvchar;
}
publicvoidsetVchar(charvchar) {
this.vchar = vchar;
}
publicbytegetVbyte() {
returnvbyte;
}
publicvoidsetVbyte(bytevbyte) {
this.vbyte = vbyte;
}
publicshortgetVshort() {
returnvshort;
}
publicvoidsetVshort(shortvshort) {
this.vshort = vshort;
}
publicintgetVint() {
returnvint;
}
publicvoidsetVint(intvint) {
this.vint = vint;
}
publiclonggetVlong() {
returnvlong;
}
publicvoidsetVlong(longvlong) {
this.vlong = vlong;
}
publicfloatgetVfloat() {
returnvfloat;
}
publicvoidsetVfloat(floatvfloat) {
this.vfloat = vfloat;
}
publicdoublegetVdouble() {
returnvdouble;
}
publicvoidsetVdouble(doublevdouble) {
this.vdouble = vdouble;
}
publicbooleanisVboolean() {
returnvboolean;
}
publicvoidsetVboolean(booleanvboolean) {
this.vboolean = vboolean;
}
publicDate getDddd() {
returndddd;
}
publicvoidsetDddd(Date dddd) {
this.dddd = dddd;
}
publicDate getV_Date() {
returnv_Date;
}
publicvoidsetV_Date(Date v_Date) {
this.v_Date = v_Date;
}
publicDate getvDate() {
returnvDate;
}
publicvoidsetvDate(Date vDate) {
this.vDate = vDate;
}
publicObject getVnull() {
returnvnull;
}
publicvoidsetVnull(Object vnull) {
this.vnull = vnull;
}
publicString[] getAvString() {
returnavString;
}
publicvoidsetAvString(String[] avString) {
this.avString = avString;
}
publicint[] getAvint() {
returnavint;
}
publicvoidsetAvint(int[] avint) {
this.avint = avint;
}
publicboolean[] getAvboolean() {
returnavboolean;
}
publicvoidsetAvboolean(boolean[] avboolean) {
this.avboolean = avboolean;
}
publicList<String> getListString() {
returnlistString;
}
publicvoidsetListString(List<String> listString) {
this.listString = listString;
}
publicMap<String, String> getMap() {
returnmap;
}
publicvoidsetMap(Map<String, String> map) {
this.map = map;
}
publicBar getBar() {
returnbar;
}
publicvoidsetBar(Bar bar) {
this.bar = bar;
}
publicBar[] getAvBar() {
returnavBar;
}
publicvoidsetAvBar(Bar[] avBar) {
this.avBar = avBar;
}
publicList<Bar> getListBar() {
returnlistBar;
}
publicvoidsetListBar(List<Bar> listBar) {
this.listBar = listBar;
}
}
packagelavasoft.stu.json;
importcom.alibaba.fastjson.JSON;
importcom.alibaba.fastjson.serializer.SerializeConfig;
importcom.alibaba.fastjson.serializer.SimpleDateFormatSerializer;
importjava.util.Date;
importjava.util.Random;
/**
* Created by IntelliJ IDEA.
*
* @author leizhimin 11-11-22 上午9:15
*/
publicclassBar {
publicstaticSerializeConfig mapping =newSerializeConfig();
privateString barName;
privateintbarAge;
privateDate barDate =newDate();
static{
mapping.put(Date.class,newSimpleDateFormatSerializer("yyyy-MM-dd"));
}
{
Random r =newRandom();
barName ="sss_"+String.valueOf(r.nextFloat());
barAge = r.nextInt();
}
publicstaticvoidmain(String[] args) {
Object obj = JSON.toJSON(newBar());
String x1 = JSON.toJSONString(newBar(),true);
System.out.println(x1);
String x2 = JSON.toJSONString(newBar(), mapping);
System.out.println(x2);
}
publicString getBarName() {
returnbarName;
}
publicvoidsetBarName(String barName) {
this.barName = barName;
}
publicintgetBarAge() {
returnbarAge;
}
publicvoidsetBarAge(intbarAge) {
this.barAge = barAge;
}
publicDate getBarDate() {
returnbarDate;
}
publicvoidsetBarDate(Date barDate) {
this.barDate = barDate;
}
@Override
publicString toString() {
return"Bar{"+
"barName='"+ barName + ''' +
", barAge="+ barAge +
", barDate="+ barDate +
'}';
}
}
packagelavasoft.stu.json;
importcom.alibaba.fastjson.JSON;
importcom.alibaba.fastjson.JSONArray;
importcom.alibaba.fastjson.serializer.SerializeConfig;
importcom.alibaba.fastjson.serializer.SimpleDateFormatSerializer;
importjava.util.*;
/**
* Created by 2IntelliJ IDEA.
*
* @author leizhimin 11-11-22 上午9:45
*/
publicclassTest {
privatestaticSerializeConfig mapping =newSerializeConfig();static{
mapping.put(Date.class,newSimpleDateFormatSerializer("yyyy-MM-dd HH:mm:ss"));
}
publicstaticvoidmain(String[] args) {
Foo f1 =newFoo();
Date date =newDate();
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);
}
publicstaticvoidjson2List(){
//List -> JSON array
List<Bar> barList =newArrayList<Bar>();
barList.add(newBar());
barList.add(newBar());
barList.add(newBar());
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());
}
}
publicstaticvoidjson2Map(){
//Map -> JSON
Map<String,Bar> map =newHashMap<String, Bar>();
map.put("a",newBar());
map.put("b",newBar());
map.put("c",newBar());
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));
}
}
publicstaticvoidarray2JSON(){
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);
}
publicstaticvoidarray2JSON2(){
Bar[] arr_Bar= {newBar(),newBar(),newBar()};
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);
}
publicstaticvoidmap2JSON(){
Map map =newHashMap();
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());
}
}
}
说明：
SerializeConfig：是对序列化过程中一些序列化过程的特殊配置，这里用作日期格式的定义。
有关需要带类型的全类型序列化过程，需要调用JSON.toJSONStringZ()方法。
需要美化输出时候，需要打开序列化美化开关，在方法中true那个参数。
输出结果：
"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通过各方面测试都很好，功能性能都是No.1，喜欢，它的源代码质量很高，作者也煞费苦心，将性能做到了最好，全免超越其他的json类库。
从其中的源代码中，可以学到很多东西，在阅读源码后，不得不佩服作者高超的程序设计水平，和高质量的编码。
感谢alibaba对此工具开源。
fastjson-1.1.10-sources.jar
由于fastjson缺乏良好的api文档，在阅读源码过程中，参考了网上一些文档：
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 岩” 博客，请务必保留此出处http://lavasoft.blog.51cto.com/62575/723192
