fastJson

1.将对象（包含JSONObject对象）转换成JSONObject对象：
JSON.toJSON(Object obj);
2.将对象（包含JSONObject对象）转换成JSON字符串：
JSON.toJSONString(Object obj);
3.将对象（包含JSONObject对象）转换成标准格式的json字符串：
JSON.toJSONString(Object obj,true);

4.序列化部分字段：
SimplePropertyPreFilter filter = new SimplePropertyPreFilter(实体类.class, "字段1","字段2")
String json =JSON.toJSONString(Object obj,filter);

5.将json字符串转化成class类
JSON.parseObject(String text, Class<T> clazz)
6.将json字符串转化成JSONObject对象
JSON.parseObject(String text)

package com.sxlg.fastJson.model;

/**
 * 严格的一个JavaBean组件
 */
public class Student
{

    public Student(int id,String name,int age)
    {
        this.id = id;
        this.name = name;
        this.age = age;
    }
    private int id;
    private String name;
    private int age;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Student=[id="+this.id+",age="+this.age+",name="+this.name+"]";
    }
}

package com.sxlg.fastJson.model;

import java.util.List;

/**
 * 严格的一个JavaBean组件
 */
public class Teacher
{

    public Teacher()
    {
    }
    public Teacher(int id,String name,List<Student> students)
    {
        this.id = id;
        this.name = name;
        this.students = students;
    }
    private int id;
    private String name;

    private List<Student> students;


    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<Student> getStudents() {
        return students;
    }

    public void setStudents(List<Student> students) {
        this.students = students;
    }
}

package com.sxlg.fastJson;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SimplePropertyPreFilter;
import com.sxlg.fastJson.model.Student;
import com.sxlg.fastJson.model.Teacher;

import java.util.ArrayList;
import java.util.List;

/**
 * JOSNObject 对象
 * JSONArray 对象
 * JSON 提供json对象和字符串转换的常用方法
 */
public class Test
{
    public static void main(String[] args)
    {
        Student student1 = new Student(1,"GalHa",25);
        Student student2 = new Student(2,"GalHa",25);
        Student student3 = new Student(3,"GalHa",25);

        List<Student> list = new ArrayList<Student>();
        list.add(student1);
        list.add(student2);
        list.add(student3);

        Teacher teacher = new Teacher(1,"sadw",list);

        // 将对象转换成JSONObject对象
        JSONObject json = (JSONObject) JSON.toJSON(student1);
        // 将对象转换成json字符串
        String js = JSON.toJSONString(student1);

        // 将对象转换成JSONObject对象
        JSONObject json1 = (JSONObject) JSON.toJSON(teacher);
        // 将对象转换成标准格式的json字符串
        String js1 = JSON.toJSONString(teacher,true);

        // 序列化部分字段
        SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Student.class, "id","age");
        String jsonStu =JSON.toJSONString(student1,filter);


        //System.out.println(json);
        //System.out.println(js);

        //System.out.println(json1);
        //System.out.println(js1);
        //System.out.println("将json字符串转换成实体类："+JSON.parseObject(js1,Student.class));


        System.out.println("将json字符串转换成JSONObject对象："+JSON.parseObject(js1));
    }
}