【JSON解析】浅谈JSONObject的使用（下）List与json字符串互转先定义list集合，list转json字

List与json字符串互转

先定义list集合，list转json字符串

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//定义list集合

List list = new ArrayList();

list.add(new Student("张三", "123"));

list.add(new Student("李四", "456"));

//list转json字符串

JSONArray jsonArray = JSONArray.fromObject(list);

System.out.println(jsonArray);

json字符串转list

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//json字符串转list

List list2 = new ArrayList();

String jsondata = "[{\"password\":\"123\",\"username\":\"张三\"},{\"password\":\"456\",\"username\":\"李四\"}]";

JSONArray jsonArray1 = JSONArray.fromObject(jsondata);

for(int i = 0; i < jsonArray1.size(); i++) {

JSONObject jsonObject2 = jsonArray1.getJSONObject(i);

Student stu2 = (Student)JSONObject.toBean(jsonObject2, Student.class);

list2.add(stu2);

}

System.out.println(list2);

全部代码

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import java.util.ArrayList;

import java.util.List;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

public class Json {

public static void main(String[] args) {

//定义list集合

List list = new ArrayList();

list.add(new Student("张三", "123"));

list.add(new Student("李四", "456"));

//list转json字符串

JSONArray jsonArray = JSONArray.fromObject(list);

System.out.println(jsonArray);

//json字符串转list

List list2 = new ArrayList();

String jsondata = "[{\"password\":\"123\",\"username\":\"张三\"},{\"password\":\"456\",\"username\":\"李四\"}]";

JSONArray jsonArray1 = JSONArray.fromObject(jsondata);

for(int i = 0; i < jsonArray1.size(); i++) {

JSONObject jsonObject2 = jsonArray1.getJSONObject(i);

Student stu2 = (Student)JSONObject.toBean(jsonObject2, Student.class);

list2.add(stu2);

}

System.out.println(list2);

}

}

运行结果

Map与json字符串互转

定义map集合，Map转json字符串

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//定义map集合

Map map = new HashMap();

map.put("1", new Student("张三", "123"));

map.put("2", new Student("李四", "456"));

//Map转json字符串

JSONObject jsonMap = JSONObject.fromObject(map);

System.out.println(jsonMap);

定义字符串map集合，map集合字符串转为map

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//定义字符串map集合

String jsondata = "{\"1\":{\"password\":\"123\",\"username\":\"张三\"},\"2\":{\"password\":\"456\",\"username\":\"李四\"}}";

//map集合字符串转为map

Map map2 = (Map)JSONObject.fromObject(jsondata);

Set set = map2.keySet();

//定义迭代器，迭代输出

Iterator ite = set.iterator();

while(ite.hasNext()) {

//取出一个字符串对象

String key = (String)ite.next();

//转为json格式

JSONObject jsonObject = JSONObject.fromObject(map2.get(key));

//转为对象

Student stu = (Student)JSONObject.toBean(jsonObject, Student.class);

System.out.println(key+" "+stu);

}

全部代码

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import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

import net.sf.json.JSONObject;

public class Json {

public static void main(String[] args) {

//定义map集合

Map map = new HashMap();

map.put("1", new Student("张三", "123"));

map.put("2", new Student("李四", "456"));

//Map转json字符串

JSONObject jsonMap = JSONObject.fromObject(map);

System.out.println(jsonMap);

//定义字符串map集合

String jsondata = "{\"1\":{\"password\":\"123\",\"username\":\"张三\"},\"2\":{\"password\":\"456\",\"username\":\"李四\"}}";

//map集合字符串转为map

Map map2 = (Map)JSONObject.fromObject(jsondata);

Set set = map2.keySet();

//定义迭代器，迭代输出

Iterator ite = set.iterator();

while(ite.hasNext()) {

//取出一个字符串对象

String key = (String)ite.next();

//转为json格式

JSONObject jsonObject = JSONObject.fromObject(map2.get(key));

//转为对象

Student stu = (Student)JSONObject.toBean(jsonObject, Student.class);

System.out.println(key+" "+stu);

}

}

运行结果

JSONArray与List互转

定义list集合，List转型JSONArray

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//定义list集合

List<Student> list = new ArrayList<Student>();

list.add(new Student("张三", "123"));

list.add(new Student("李四", "456"));

//List转型JSONArray

JSONArray jsonArray = JSONArray.fromObject(list);

System.out.println(jsonArray.toString());

JSONArray转型List，JSONArray是用的上面的那个jsonArray变量

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//JSONArray转型List

List<Student> list2 = JSONArray.toList(jsonArray, new Student(), new JsonConfig());

Iterator<Student> ite = list2.iterator();

while(ite.hasNext()) {

Student stu = ite.next();

System.out.println(stu);

}

全部代码

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import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import net.sf.json.JSONArray;

import net.sf.json.JsonConfig;

public class Json {

public static void main(String[] args) {

//定义list集合

List<Student> list = new ArrayList<Student>();

list.add(new Student("张三", "123"));

list.add(new Student("李四", "456"));

//List转型JSONArray

JSONArray jsonArray = JSONArray.fromObject(list);

System.out.println(jsonArray.toString());

//JSONArray转型List

List<Student> list2 = JSONArray.toList(jsonArray, new Student(), new JsonConfig());

Iterator<Student> ite = list2.iterator();

while(ite.hasNext()) {

Student stu = ite.next();

System.out.println(stu);

}

}

运行结果

JSONArray与数组互转

定义数组，数组转JSONArray

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//定义数组

boolean[] boolArray = {true, false, true};

//java数组转JSONArray

JSONArray jsonArray = JSONArray.fromObject(boolArray);

System.out.println(jsonArray.toString());

JSONArray转java数组

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//JSONArray转java数组

Object obj[] = jsonArray.toArray();

for(Object o : obj) {

System.out.print(o+"\t");

}

全部代码

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import net.sf.json.JSONArray;

public class Json {

public static void main(String[] args) {

//定义数组

boolean[] boolArray = {true, false, true};

//java数组转JSONArray

JSONArray jsonArray = JSONArray.fromObject(boolArray);

System.out.println(jsonArray.toString());

//JSONArray转java数组

Object obj[] = jsonArray.toArray();

for(Object o : obj) {

System.out.print(o+"\t");

}

}

运行结果

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