Java-FastJson

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一、源码地址

点击打开链接

二、maven依赖
via Maven:replace VERSION_CODE with real version name such as 1.2.21<dependency>    <groupId>com.alibaba</groupId>    <artifactId>fastjson</artifactId>    <version>VERSION_CODE</version></dependency>三、主要API

public static final Object parse(String text); // 把JSON文本parse为JSONObject或者JSONArray*public static final JSONObject parseObject(String text)； // 把JSON文本parse成JSONObject*public static final  T parseObject(String text, Class clazz); // 把JSON文本parse为JavaBean(按照一个类Decode)*public static final JSONArray parseArray(String text); // 把JSON文本parse成JSONArray*public static final  List parseArray(String text, Class clazz); //把JSON文本parse成JavaBean集合

*public static final String toJSONString(Object object); // 将JavaBean序列化为JSON文本public static final String toJSONString(Object object, boolean prettyFormat); // 将JavaBean序列化为带格式的JSON文本public static final Object toJSON(Object javaObject); 将JavaBean转换为JSONObject或者JSONArray。以上加*的是常用方法。

此外，

用JSONObject的put方法和JSONArray的add方法，可以根据key动态构建json

四、测试学习
package com.scalalearn.java.main.fastJson;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONArray;import com.alibaba.fastjson.JSONObject;import java.util.ArrayList;import java.util.Arrays;import java.util.Iterator;import java.util.List;/** * Created by hjw on 17/3/19. *//*源码地址：https://github.com/alibaba/fastjsonvia Maven:replace VERSION_CODE with real version name such as 1.2.21<dependency>    <groupId>com.alibaba</groupId>    <artifactId>fastjson</artifactId>    <version>VERSION_CODE</version></dependency>public static final Object parse(String text); // 把JSON文本parse为JSONObject或者JSONArray*public static final JSONObject parseObject(String text)； // 把JSON文本parse成JSONObject*public static final  T parseObject(String text, Class clazz); // 把JSON文本parse为JavaBean(按照一个类Decode)*public static final JSONArray parseArray(String text); // 把JSON文本parse成JSONArray*public static final  List parseArray(String text, Class clazz); //把JSON文本parse成JavaBean集合*public static final String toJSONString(Object object); // 将JavaBean序列化为JSON文本public static final String toJSONString(Object object, boolean prettyFormat); // 将JavaBean序列化为带格式的JSON文本public static final Object toJSON(Object javaObject); 将JavaBean转换为JSONObject或者JSONArray。以上加*的是常用方法。*//*单用户:idname */ class User{    private Long id;    private String name;    public void setId(Long id) {        this.id = id;    }    public void setName(String name) {        this.name = name;    }    public Long getId() {        return id;    }    public String getName() {        return name;    }    public User() {    }    public User(Long id, String name) {        this.id = id;        this.name = name;    }}class Group{    private Long id;    private String name;    private List<User> users = new ArrayList<User>();    //id    public Long getId() {        return id;    }    public void setId(Long id) {        this.id = id;    }    //name    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    //user    public List<User> getUsers() {        return users;    }    public void setUsers(List<User> users) {        this.users = users;    }    public void addUser(User user){        users.add(user);    }}public class FastJsonDemo{    public static void main(String[] args) {        //============== 对象序序列化为JSON与Decode        Group group = new Group();        group.setId(0L);        group.setName("admin");        User rootUser = new User();        rootUser.setId(2L);        rootUser.setName("root");        User guestUser = new User();        guestUser.setId(3L);        guestUser.setName("guest");        group.addUser(rootUser);        group.addUser(guestUser);        //code        String jsonString = JSON.toJSONString(group);        System.out.println(jsonString);        //{"id":0,"name":"admin","users":[{"id":2,"name":"root"},{"id":3,"name":"guest"}]}        //Decode        String jsonStringGroup = jsonString;        Group paresGroup = JSON.parseObject(jsonString, Group.class);        //============== JSONArray        List<User> userList = new ArrayList<User>();        userList.add(new User(0L,"李四"));        userList.add(new User(1L,"张三"));        System.out.println("=======public static final String toJSONString(Object object);");        System.out.println(JSON.toJSONString(userList));        //[{"id":0,"name":"李四"},{"id":1,"name":"张三"}]        System.out.println("======public static final Object toJSON(Object javaObject); 将JavaBean转换为JSONObject或者JSONArray。");        JSONArray jsonArray = (JSONArray) JSON.toJSON(userList);        System.out.println(jsonArray);        //[{"id":0,"name":"李四"},{"id":1,"name":"张三"}]        Iterator<Object> iter = jsonArray.iterator();        while(iter.hasNext()){            JSONObject ob = (JSONObject) iter.next();            System.out.println("id = " + ob.getInteger("id") + "  name = " + ob.getString("name"));        }        // id = 0  name = 李四        // id = 1  name = 张三        //==========parseArray        System.out.println("======*public static final JSONArray parseArray(String text); // 把JSON文本parse成JSONArray");        String str = "[{\"id\":0,\"name\":\"王五\"},{\"id\":1,\"name\":\"赵四\"}]";        JSONArray jsArr = JSON.parseArray(str);        Iterator<Object> iter2 = jsArr.iterator();        while(iter2.hasNext()){            JSONObject ob = (JSONObject) iter2.next();            System.out.println("id = " + ob.getInteger("id") + "  name = " + ob.getString("name"));        }        //id = 0  name = 王五        //id = 1  name = 赵四        System.out.println("======public static final  List parseArray(String text, Class clazz); //把JSON文本parse成JavaBean集合");        List<User> userLIst2 = JSON.parseArray(str,User.class);        for(User usr : userLIst2){            System.out.print("id = " + usr.getId());            System.out.println(" name = " + usr.getName());        }        //=====pareObject        System.out.println("=======public static final JSONObject parseObject(String text)； // 把JSON文本parse成JSONObject");        String str3 = "{\"id\":0,\"name\":\"TOM\"}";        JSONObject job = JSON.parseObject(str3);        System.out.println("id = " + job.getInteger("id") + " name = " + job.getString("name"));        //id = 0 name = TOM        //根据(key, value)动态构建JSONObject        //{"total":12,"List":[{"id":0,"name":"李四"},{"id":1,"name":"张三"}]}        System.out.println("=======根据(key, value)动态构建JSONObject");        List<User>  ls = new ArrayList<User>(Arrays.asList(new User(0L,"李四"), new User(1L,"张三")));        JSONObject jsonObj = new JSONObject();        jsonObj.put("total",12);        JSONArray jsonArr = new JSONArray();        for (User us : ls){            JSONObject jobj = new JSONObject();            jobj.put("id",us.getId());            jobj.put("name",us.getName());            jsonArr.add(jobj);        }        jsonObj.put("List",jsonArr);        System.out.println(jsonObj);        //{"List":[{"id":0,"name":"李四"},{"id":1,"name":"张三"}],"total":12}    }}

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