JSONObject 与 JSONArray区别
JSONObject:
{"area": "武汉","name": "张三","age": 25}
JSONArray:
[{“area”: “武汉”,“name”: “张三”,“age”: 25},{“area”: “深圳”,“name”: “李四”,“age”: 22}]
通俗来讲 JSONObject 是对象的json形式 JSONArry 是对象集合的JSON形式。
JSON 与javabean互转
JSON用阿里的fastjson 包
用例java对象
public class User { protected Long id; protected String account; protected String password; protected String name; protected boolean gender; protected String telephone; @Override public String toString() { return "User{" + "id=" + id + ", account='" + account + '\'' + ", password='" + password + ''' + ", name='" + name + '\'' + ", gender=" + gender + ", telephone='" + telephone + ''' + '}'; } public boolean isGender() { return gender; } public void setGender(boolean gender) { this.gender = gender; } public String getTelephone() { return telephone; } public void setTelephone(String telephone) { this.telephone = telephone; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getAccount() { return account; } public void setAccount(String account) { this.account = account; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; }}
1、javabean转json
方法一：通过java对象转成String再转成JSONObject
package com.handoop.gms.utils;import com.alibaba.fastjson.JSONObject;import com.handoop.gms.domain.User;public class TestMain { public static void main(String []args){ //先通过构造函数初始化一个对象 User user=new User((long) 1,"admin","admin","张三",true,"123456"); //先将java对象转为String类型 String jsonString= JSONObject.toJSONString(user); //再将String类型转为JSONObject JSONObject jsonObject=JSONObject.parseObject(jsonString); System.out.println(jsonObject); //转为JSONObject后就可以随时根据键值获取他的元素了 System.out.println(jsonObject.get("password")); }}
运行结果
方法2：java对象直接转json
package com.handoop.gms.utils;import com.alibaba.fastjson.JSONArray;import com.alibaba.fastjson.JSONObject;import com.handoop.gms.domain.User;public class TestMain { public static void main(String []args){ //先通过构造函数初始化一个对象 User user=new User((long) 1,"admin","admin","张三",true,"123456"); JSONObject jsonObject= (JSONObject) JSONObject.toJSON(user); System.out.println(jsonObject); }}
运行结果
json字符串转JSONObeject
public class TestMain { public static void main(String []args){ String str="{\"password\":\"admin\",\"gender\":true,\"name\":\"张三\",\"telephone\":\"123456\",\"id\":1,\"account\":\"admin\"}"; JSONObject jsonObject=JSONObject.parseObject(str); System.out.println("account: "+jsonObject.get("account")+"---"+"paasword: "+jsonObject.get("password")); }}
运行结果
3.jsonString 转JSONArray
public class TestMain { public static void main(String []args){ String str="{\"data\":[{\"password\":\"admin\",\"gender\":true,\"name\":\"张三\",\"telephone\":\"123456\",\"id\":1,\"account\":\"admin\"}]}"; //先转成JSONObject JSONObject jsonObject=JSONObject.parseObject(str); //再将JSONObject中数组类型数据取出转成JSONArray JSONArray jsonArray=jsonObject.getJSONArray("data"); System.out.println(jsonArray.get(0)); }}
运行结果
4.JSON字符串转JAVA对象
String str="{\"password\":\"admin\",\"gender\":true,\"name\":\"张三\",\"telephone\":\"123456\",\"id\":1,\"account\":\"admin\"}"; // 前面是JSON字符串 后面是java对象类型 User user=JSONObject.parseObject(str,User.class); System.out.println("account: "+user.getAccount()+"---"+"paasword: "+user.getPassword());
输出结果
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