Json的详细使用（一）处理数组/List/Map

package fastJson.test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;

public class FastJsonTest1
{

    /**
     * 数组转json格式字符串
     */
    public void array2Json(){
        String[] arr = {"bill","green","maks","jim"};
        String jsonText = JSON.toJSONString(arr, true);
        System.out.println("array2Json()方法：jsonText=="+jsonText);
        // 输出结果：jsonText==["bill","green","maks","jim"]
    }

    /**
     * json格式字符串转数组
     */
    public void json2Array(){
        String jsonText = "["bill","green","maks","jim"]";
        JSONArray jsonArr = JSON.parseArray(jsonText);
        System.out.println("json2Array()方法：jsonArr=="+jsonArr);
        // 输出结果：jsonArr==["bill","green","maks","jim"]
    }
    
    /**
     * 数组转json格式字符串
     */
    public void array2Json2(){
        User user1 = new User("P001","TOM",16);
        User user2 = new User("P002","JACKSON",21);
        User user3 = new User("P003","MARTIN",20);
        User[] userArr = {user1,user2,user3};
        String jsonText = JSON.toJSONString(userArr, true);
        System.out.println("array2Json2()方法：jsonText=="+jsonText);
        //输出结果：jsonText==[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}]
    }
    
    /**
     * json格式字符串转数组
     */
    public void json2Array2(){
        String jsonText = "[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}]";
        JSONArray jsonArr = JSON.parseArray(jsonText);
        System.out.println("json2Array2()方法：jsonArr=="+jsonArr);
        // 输出结果：jsonArr==[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}]
    }
    
    /**
     * list集合转json格式字符串
     */
    public void list2Json(){
        List list = new ArrayList();
        User user1 = new User("L001","TOM",16);
        list.add(user1);
        User user2 = new User("L002","JACKSON",21);
        list.add(user2);
        User user3 = new User("L003","MARTIN",20);
        list.add(user3);
        String jsonText = JSON.toJSONString(list, true);
        System.out.println("list2Json()方法：jsonText=="+jsonText);
        //输出结果：jsonText==[{"age":16,"id":"L001","name":"TOM"},{"age":21,"id":"L002","name":"JACKSON"},{"age":20,"id":"L003","name":"MARTIN"}]
    }
    
    /**
     * list集合转json格式字符串
     */
    public void list2Json2(){
        List list = new ArrayList();
        Address address1 = new Address("广东省","深圳市","科苑南路","580053");
        User user1 = new User("L001","TOM",16,address1);
        list.add(user1);
        Address address2 = new Address("江西省","南昌市","阳明路","330004");
        User user2 = new User("L002","JACKSON",21,address2);
        list.add(user2);
        Address address3 = new Address("陕西省","西安市","长安南路","710114");
        User user3 = new User("L003","MARTIN",20,address3);
        list.add(user3);
        String jsonText = JSON.toJSONString(list, true);
        System.out.println("list2Json2()方法：jsonText=="+jsonText);
        //输出结果：jsonText==[{"address":{"city":"深圳市","post":"580053","province":"广东省","street":"科苑南路"},"age":16,"id":"L001","name":"TOM"},{"address":{"city":"南昌市","post":"330004","province":"江西省","street":"阳明路"},"age":21,"id":"L002","name":"JACKSON"},{"address":{"city":"西安市","post":"710114","province":"陕西省","street":"长安南路"},"age":20,"id":"L003","name":"MARTIN"}]
    }

    /**
     * map转json格式字符串
     */
    public void map2Json(){
        Map map = new HashMap();
        Address address1 = new Address("广东省","深圳市","科苑南路","580053");
        map.put("address1", address1);
        Address address2 = new Address("江西省","南昌市","阳明路","330004");
        map.put("address2", address2);
        Address address3 = new Address("陕西省","西安市","长安南路","710114");
        map.put("address3", address3);
        String jsonText = JSON.toJSONString(map, true);
        System.out.println("map2Json()方法：jsonText=="+jsonText);
        //输出结果：jsonText=={"address1":{"city":"深圳市","post":"580053","province":"广东省","street":"科苑南路"},"address2":{"city":"南昌市","post":"330004","province":"江西省","street":"阳明路"},"address3":{"city":"西安市","post":"710114","province":"陕西省","street":"长安南路"}}
    }
    
    
    
    public static void main(String[] args)
    {
        FastJsonTest1 test = new FastJsonTest1();
        //数组转json格式字符串
        test.array2Json();
        
        //json格式字符串转数组
        test.json2Array();
        
        //数组转json格式字符串
        test.array2Json2();
        
        //json格式字符串转数组
        test.json2Array2();
        
        //list集合转json格式字符串
        test.list2Json();
        
        //list集合转json格式字符串
        test.list2Json2();
        
        //map转json格式字符串
        test.map2Json();
    }
}

控制台输出结果：

array2Json()方法：jsonText==["bill","green","maks","jim"]
json2Array()方法：jsonArr==["bill","green","maks","jim"]
array2Json2()方法：jsonText==[{
    "age":16,
    "id":"P001",
    "name":"TOM"
},{
    "age":21,
    "id":"P002",
    "name":"JACKSON"
},{
    "age":20,
    "id":"P003",
    "name":"MARTIN"
}]
json2Array2()方法：jsonArr==[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}]
list2Json()方法：jsonText==[
    {
        "age":16,
        "id":"L001",
        "name":"TOM"
    },
    {
        "age":21,
        "id":"L002",
        "name":"JACKSON"
    },
    {
        "age":20,
        "id":"L003",
        "name":"MARTIN"
    }
]
list2Json2()方法：jsonText==[
    {
        "address":{
            "city":"深圳市",
            "post":"580053",
            "province":"广东省",
            "street":"科苑南路"
        },
        "age":16,
        "id":"L001",
        "name":"TOM"
    },
    {
        "address":{
            "city":"南昌市",
            "post":"330004",
            "province":"江西省",
            "street":"阳明路"
        },
        "age":21,
        "id":"L002",
        "name":"JACKSON"
    },
    {
        "address":{
            "city":"西安市",
            "post":"710114",
            "province":"陕西省",
            "street":"长安南路"
        },
        "age":20,
        "id":"L003",
        "name":"MARTIN"
    }
]
map2Json()方法：jsonText=={"address1":{
    "city":"深圳市",
    "post":"580053",
    "province":"广东省",
    "street":"科苑南路"
},"address2":{
    "city":"南昌市",
    "post":"330004",
    "province":"江西省",
    "street":"阳明路"
},"address3":{
    "city":"西安市",
    "post":"710114",
    "province":"陕西省",
    "street":"长安南路"
}}

  

附：javabean类 User.java
[java] view plaincopy
package fastJson.test;  
  
import java.io.Serializable;  
  
public class User implements Serializable {  
      
    private static final long serialVersionUID = 1L;  
      
    private String id;  
    private String name;  
    private int age;  
    private Address address;  
      
    public User() {  
        super();  
    }  
  
    public User(String id, String name, int age) {  
        super();  
        this.id = id;  
        this.name = name;  
        this.age = age;  
    }  
      
    public User(String id, String name, int age, Address address)  
    {  
        super();  
        this.id = id;  
        this.name = name;  
        this.age = age;  
        this.address = address;  
    }  
  
    public int getAge() {  
        return age;  
    }  
  
    public void setAge(int age) {  
        this.age = age;  
    }  
  
    public String getId() {  
        return id;  
    }  
  
    public void setId(String id) {  
        this.id = id;  
    }  
  
    public String getName() {  
        return name;  
    }  
  
    public void setName(String name) {  
        this.name = name;  
    }  
  
    public Address getAddress()  
    {  
        return address;  
    }  
  
    public void setAddress(Address address)  
    {  
        this.address = address;  
    }  
      
}  

Address.java
[java] view plaincopy
package fastJson.test;  
  
import java.io.Serializable;  
  
public class Address implements Serializable  
{  
    private static final long serialVersionUID = 1L;  
      
    private String province;  
    private String city;  
    private String street;  
    private String post;  
      
    public Address()  
    {  
        super();  
    }  
      
    public Address(String province, String city, String street, String post)  
    {  
        super();  
        this.province = province;  
        this.city = city;  
        this.street = street;  
        this.post = post;  
    }  
  
    public String getCity()  
    {  
        return city;  
    }  
  
    public void setCity(String city)  
    {  
        this.city = city;  
    }  
  
    public String getPost()  
    {  
        return post;  
    }  
  
    public void setPost(String post)  
    {  
        this.post = post;  
    }  
  
    public String getProvince()  
    {  
        return province;  
    }  
  
    public void setProvince(String province)  
    {  
        this.province = province;  
    }  
  
    public String getStreet()  
    {  
        return street;  
    }  
  
    public void setStreet(String street)  
    {  
        this.street = street;  
    }  
      
}  

转自 http://blog.csdn.net/hu_shengyang/article/details/8447787 谢谢分享