1500字范文 > Json字符串转对象和转List集合操作（alibabab版本）

Json字符串转对象和转List集合操作（alibabab版本）

时间：2021-09-18 09:53:51

Json是当前开发用得最多基于JavaScript语言的轻量级的数据交换格式，总结一下常用转换格式的方法，以便日后使用方便

以下为alibabab 包各种 JSON 转换的方法总结：

1. 所需引入的第三方包：

<dependency><groupId>commons-beanutils</groupId><artifactId>commons-beanutils</artifactId><version>1.9.3</version></dependency><dependency><groupId>commons-collections</groupId><artifactId>commons-collections</artifactId><version>3.2.1</version></dependency><dependency><groupId>commons-lang</groupId><artifactId>commons-lang</artifactId><version>2.6</version></dependency><dependency><groupId>commons-logging</groupId><artifactId>commons-logging</artifactId><version>1.2</version></dependency><dependency><groupId>net.sf.ezmorph</groupId><artifactId>ezmorph</artifactId><version>1.0.4</version></dependency><dependency><groupId>net.sf.json-lib</groupId><artifactId>json-lib</artifactId><version>2.4</version><classifier>jdk13</classifier></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.28</version></dependency>

2. 对象User类

package com.lmx.demo;public class User{private String cId;private String uName;private String pwd;public User(){}public User(String cId, String uName, String pwd){this.cId = cId;this.uName = uName;this.pwd = pwd;}public String getcId(){return cId;}public void setcId(String cId){this.cId = cId;}public String getuName(){return uName;}public void setuName(String uName){this.uName = uName;}public String getPwd(){return pwd;}public void setPwd(String pwd){this.pwd = pwd;}}

3. Json各类转换

package com.lmx.demo;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;import com.alibaba.fastjson.JSONObject;/*** alibaba 第三方包 Json 转换用法* @author LMX**/public class Main{/*** 1.通过JSON.parse把json转换为Map* * @param jsonStr*/public void getJsonToMap(){String jsonStr = "{\"userName\":\"lmx\",\"pwd\":\"123456\",\"address\":\"sz\",\"Id\":\"1\"}";Map maps = (Map)JSON.parse(jsonStr);for (Object map : maps.entrySet()){System.out.println("key为：" + ((Map.Entry)map).getKey() + ", 值为：" + ((Map.Entry)map).getValue());}/* 输出: key为：address, 值为：szkey为：Id, 值为：1key为：userName, 值为：lmxkey为：pwd, 值为：123456 */}/*** 2.通过JSON.parseObject把json转换为Map* * @param jsonStr* @return*/public void getJsonToMapByClass(){String jsonStr = "{\"userName\":\"lmx\",\"pwd\":\"123456\",\"address\":\"sz\",\"Id\":\"1\"}";Map mapTypes = JSON.parseObject(jsonStr, Map.class);for (Object obj : mapTypes.keySet()){System.out.println("key为：" + obj + ", 值为：" + mapTypes.get(obj));}/* 输出: key为：address, 值为：szkey为：Id, 值为：1key为：userName, 值为：lmxkey为：pwd, 值为：123456*/}/*** 3.通过JSON.parseObject把json转换为Object* * @param jsonStr* @return*/public void getJsonToObject(){String jsonStr = "{\"userName\":\"lmx\",\"pwd\":\"123456\",\"address\":\"sz\",\"Id\":\"1\"}";Map mapTypes = JSON.parseObject(jsonStr);for (Object obj : mapTypes.keySet()){System.out.println("key为：" + obj + ", 值为：" + mapTypes.get(obj));}/* 输出: key为：address, 值为：szkey为：Id, 值为：1key为：userName, 值为：lmxkey为：pwd, 值为：123456*/}/*** 4.通过JSONObject.parse把json转换为Map* * @param jsonStr*/public void getJSONObjectToMap(){String jsonStr = "{\"userName\":\"lmx\",\"pwd\":\"123456\",\"address\":\"sz\",\"Id\":\"1\"}";Map json = (Map)JSONObject.parse(jsonStr);for (Object map : json.entrySet()){System.out.println("key为：" + ((Map.Entry)map).getKey() + ", 值为：" + ((Map.Entry)map).getValue());}/* 输出: key为：address, 值为：szkey为：Id, 值为：1key为：userName, 值为：lmxkey为：pwd, 值为：123456*/}/*** 5.通过JSONObject.parseObject把json转换为JSONObject,并遍历单Object输出* * @param jsonStr*/public void getJSONObjectToObject(){String jsonStr = "{\"userName\":\"lmx\",\"pwd\":\"123456\",\"address\":\"sz\",\"Id\":\"1\"}";JSONObject jsonObject = JSONObject.parseObject(jsonStr);for (Object map : jsonObject.entrySet()){System.out.println("key为：" + ((Map.Entry)map).getKey() + ", 值为：" + ((Map.Entry)map).getValue());}/* 输出: key为：address, 值为：szkey为：Id, 值为：1key为：userName, 值为：lmxkey为：pwd, 值为：123456*/}/*** 6.通过JSONObject.parseObject把json转换为Map* * @param jsonStr*/public void getJSONObjectToMapClass(){String jsonStr = "{\"userName\":\"lmx\",\"pwd\":\"123456\",\"address\":\"sz\",\"Id\":\"1\"}";Map mapObj = JSONObject.parseObject(jsonStr, Map.class);for (Object map : mapObj.entrySet()){System.out.println("key为：" + ((Map.Entry)map).getKey() + ", 值为：" + ((Map.Entry)map).getValue());}/* 输出: key为：address, 值为：szkey为：Id, 值为：1key为：userName, 值为：lmxkey为：pwd, 值为：123456*/}// List集合和JSON相互转换工具类///*** 7.通过JSON.toJSONString把List<T>转换为json* * @param obj* @return*/public static <T> String getListToJson(List<T> obj){String jsonStr = JSON.toJSONString(obj);return jsonStr;// String输出: ["aa","bb","cc"]// userModel输出: [{"cId":"100","pwd":"123456","uName":"lmx"},{"cId":"200","pwd":"123456","uName":"jqy"}]}/*** 8.通过JSONArray.parseArray把json转换为List<T>* * @param jsonStr* @param model* @return*/public static <T> List<T> getStringToList(String jsonStr, Class<T> model){List<T> object = (List<T>)JSONArray.parseArray(jsonStr, model);return object;// String输出: "aa","bb","cc"// userModel输出: lmx,jqy}// 对象和JSON相互转换工具类//*** 9.通过JSONObject.toJSONString把对象转换为String* @param model* @return*/public static <T> String getObjectToJson(T model){String StrObject = JSONObject.toJSONString(model);return StrObject;// User输出: {"cId":"100","pwd":"123456","uName":"lmx"}// Map输出: {"uName":"llmmxx","pwd":"123","cId":"300"}}/*** 10.通过JSONObject.parseObject把String转换为对象* @param jsonStr* @param model* @return*/public static <T> T getStringToObject(String jsonStr, Class<T> model){return JSONObject.parseObject(jsonStr, model);// User输出: {"cId":"100","pwd":"123456","uName":"lmx"}// Map输出: {"uName":"llmmxx","pwd":"123","cId":"300"}}/*** 11 .通过fluentPut添加一个值* fluentPutAll fluentPut* @param jsonStr* @return */public void setAddJSONObject(){String jsonStr = "{\"userName\":\"lmx\",\"pwd\":\"123456\",\"address\":\"sz\",\"Id\":\"1\"}";JSONObject jsonObject = JSONObject.parseObject(jsonStr);jsonObject.fluentPut("lll", "111");Map<String, String> der = new HashMap<String, String>();der.put("der1", "der1");der.put("der2", "der2");der.put("der3", "der3");jsonObject.fluentPutAll(der);//jsonObject.fluentClear();清除for (Object map : jsonObject.entrySet()){System.out.println("key为：" + ((Map.Entry)map).getKey() + ", 值为：" + ((Map.Entry)map).getValue());}/* 输出: key为：uName, 值为：lmxkey为：pwd, 值为：123456key为：der3, 值为：der3key为：lll, 值为：111key为：der1, 值为：der1key为：cId, 值为：100key为：der2, 值为：der2*/}@SuppressWarnings("static-access")public static void main(String[] args){// TODO Auto-generated method stubMain m = new Main();// 1System.out.println("getJsonToMap:");m.getJsonToMap();// 2System.out.println("getJsonToMapByClass:");m.getJsonToMapByClass();// 3System.out.println("getJsonToObject:");m.getJsonToObject();// 4System.out.println("getJSONObjectToMap:");m.getJSONObjectToMap();// 5System.out.println("getJSONObjectToObject:");m.getJSONObjectToObject();// 6System.out.println("getJSONObjectToMapClass:");m.getJSONObjectToMapClass();// 7.1 StringSystem.out.println("getListToJson by String:");List<String> StrModel = new ArrayList<String>();StrModel.add("aa");StrModel.add("bb");StrModel.add("cc");String strString = m.getListToJson(StrModel);System.out.println(strString);// 7.2 UserSystem.out.println("getListToJson by userModel:");List<User> userModel = new ArrayList<User>();User u = new User();u.setcId("100");u.setuName("lmx");u.setPwd("123456");User u1 = new User();u1.setcId("200");u1.setuName("jqy");u1.setPwd("123456");userModel.add(u);userModel.add(u1);String strUser = m.getListToJson(userModel);System.out.println(strUser);// 8.1 String System.out.println("getJsonToList by String:");List<String> strLists = m.getStringToList(strString, String.class);for (String strList : strLists){System.out.println(strList);}//8.2 User对象System.out.println("getJsonToList by User:");List<User> userLists = m.getStringToList(strUser,User.class);for (User userList : userLists){System.out.println(userList.getuName());}//9.1 User对象System.out.println("getObjectToJson by User:");String strUsers = m.getObjectToJson(u);System.out.println(strUsers);//9.2 MapSystem.out.println("getObjectToJson by Map:");Map<String , String> userMap = new HashMap<String, String>();userMap.put("cId", "300");userMap.put("uName", "llmmxx");userMap.put("pwd", "123");String strUsersMap = m.getObjectToJson(userMap);System.out.println(strUsersMap);/* //9.3 User对象System.out.println("getObjectToJson by User:");String strObjectUser = m.getObjectToJson(strUsers);System.out.println(strObjectUser);//9.4 Map对象System.out.println("getObjectToJson by Map:");String strObjectMap = m.getObjectToJson(strUsersMap);System.out.println(strObjectMap);*///10.1 User对象System.out.println("getStringToObject by User:");User stringObjectUser = m.getStringToObject(strUsers,User.class);System.out.println(JSONObject.toJSONString(stringObjectUser).toString());//10.2 Map对象System.out.println("getStringToObject by Map:");Map stringObjectMap = m.getStringToObject(strUsersMap,Map.class);System.out.println(JSONObject.toJSONString(stringObjectMap).toString());//11System.out.println("setAddJSONObject by User:");m.setAddJSONObject();}}