json

先导入jar包

准备一个User实体类

package com.test;

public class User {
private String name;
private String gender;

public User() {
}

public User(String name, String gender) {
this.name = name;
this.gender = gender;
}

public String getName() {
return name;
}

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

public String getGender() {
return gender;
}

public void setGender(String gender) {
this.gender = gender;
}

}

把一个对象转换成json

@Test
public void testUserObject() {
User u = new User();
u.setGender("男");
u.setName("dust");
JSONObject jsonObject = JSONObject.fromObject(u);
System.out.println(jsonObject.toString());

}

{"gender":"男","name":"dust"}

把数组，集合转换成json格式

// 数组,集合
@Test
public void tsetUserArray() {
List<User> userList = new ArrayList<User>();
userList.add(new User("男", "张三"));
userList.add(new User("男", "李四"));
userList.add(new User("男", "王武"));
userList.add(new User("女", "dust"));
JSONArray jsonArray = JSONArray.fromObject(userList);
String json = jsonArray.toString();
System.out.println(json);
}

[{"gender":"张三","name":"男"},{"gender":"李四","name":"男"},{"gender":"王武","name":"男"},{"gender":"dust","name":"女"}]

json过滤属性

// 过滤
@Test
public void testJsonConfig() {
User u = new User();
u.setGender("男");
u.setName("小李");
//过滤
JsonConfig jsonConfig = new JsonConfig();
//可以过滤多个属性
jsonConfig.setExcludes(new String[] { "gender" });
JSONObject jsonObject = JSONObject.fromObject(u, jsonConfig);
System.out.println(jsonObject.toString());
}

{"name":"小李"}