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

直接给代码：

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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&
24000
quot;,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：

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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

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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

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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;

}

}