fastJson在java后台转换json格式数据探究（二）--处理数组/List/Map

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直接给代码：

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

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

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;
    }
    
}

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