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

Json字符串转对象和转List集合操作（json-lib版本）

时间：2022-03-25 20:49:18

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json-lib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>xom</groupId><artifactId>xom</artifactId><version>1.2.5</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>

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.Iterator;import java.util.List;import java.util.Map;import java.util.Set;import net.sf.json.JSON;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import net.sf.json.JsonConfig;import net.sf.json.xml.XMLSerializer;/*** json-lib* * @author LMX*/public class SfJson{/*** 1. json-lib 的 JSONObject 基础操作*/public void showJSONObject(){// 创建JSONObjectJSONObject jsonObject = new JSONObject();jsonObject.put("uName", "lmx");jsonObject.put("cId", "100");System.out.println(jsonObject);// 输出：{"uName":"lmx","cId":"100"}// 增加属性jsonObject.element("pwd", "123456");System.out.println(jsonObject);// 输出： {"uName":"lmx","cId":"100","pwd":"123456"}// 取值System.out.println("cId:" + jsonObject.get("cId"));// 输出: cId:100// 判读输出对象的类型boolean isArray = jsonObject.isArray();boolean isEmpty = jsonObject.isEmpty();boolean isNullObject = jsonObject.isNullObject();System.out.println("是否数组:" + isArray);// 输出: 是否数组:falseSystem.out.println("是否空:" + isEmpty);// 输出: 是否空:falseSystem.out.println("是否空对象:" + isNullObject);// 输出: 是否空对象:false}/*** 2. json-lib 的 JSONArray 添加到JSONObject 基础操作*/public void showJSONArrayAddJSONObject(){JSONObject jsonObject = new JSONObject();JSONArray jsonArray = new JSONArray();jsonArray.add(0, "lmx");jsonArray.add(1, "jqy");jsonObject.element("uName", jsonArray);System.out.println(jsonObject);// 输出: {"uName":["lmx","jqy"]}}/*** 3. json-lib 的 JSONArray 基础操作* * @param jsonStr*/public void showJSONArray(){// 创建JSONArrayJSONArray jsonArray = new JSONArray();jsonArray.add(0, "lmx");jsonArray.add(1, "jqy");jsonArray.element("llh");System.out.println(jsonArray);// 输出: ["lmx","jqy","llh"]// 根据下标返回,打印:2System.out.println(jsonArray.get(0));// 输出: lmx// set修改jsonArray.set(0, "aa");System.out.println(jsonArray);// 输出: ["aa","jqy","llh"]// 添加最前jsonArray.add(0, "bb");// 添加最后jsonArray.add("cc");System.out.println(jsonArray);// 输出: ["bb","aa","jqy","llh","cc"]// jsonArray.clear(); 清空}/*** 4. json-lib 把JSONObject放入到JSONArray*/public void showJSONObjectAddJSONArray(){JSONObject jsonObject = new JSONObject();jsonObject.put("uName", "lmx");jsonObject.put("pwd", "123456");JSONObject jsonObject2 = new JSONObject();jsonObject2.put("uName", "lmx");jsonObject2.put("pwd", "123456");JSONArray jsonArray = new JSONArray();jsonArray.add(jsonObject);jsonArray.add(jsonObject2);System.out.println(jsonArray);// 输出:[{"uName":"lmx","pwd":"123456"},{"uName":"lmx","pwd":"123456"}]for (int i = 0; i < jsonArray.size(); i++ ){System.out.println(jsonArray.get(i));// 输出: 1. {"uName":"lmx","pwd":"123456"} 2. {"uName":"lmx","pwd":"123456"}}}/*** 5.json-lib 把 JavaBean转换成json字符串*/public void getJSONObjectToBean(){User user = new User();user.setcId("100");user.setuName("lmx");user.setPwd("123456");JSONObject jsonObject = JSONObject.fromObject(user);System.out.println(jsonObject);// 输出: {"uName":"lmx","pwd":"123456","cId":"100"}}/*** 6.json-lib 把 json字符串转换成JavaBean*/public void getBeanToJSONObject(){String strJon = "{\"uName\":\"lmx\",\"pwd\":\"123456\",\"cId\":\"100\"}";JSONObject jsonObject = JSONObject.fromObject(strJon);User user = (User)JSONObject.toBean(jsonObject, User.class);System.out.println(user);// 输出: {"uName":"lmx","pwd":"123456","cId":"100"}}/*** 7. json-lib 把 List转换成json字符串*/public void getListToJSONArray(){// List转json字符串List<User> list = new ArrayList<User>();list.add(new User("100", "lmx", "123456"));list.add(new User("200", "jqy", "123"));JSONArray jsonArray = JSONArray.fromObject(list);System.out.println(jsonArray);// 输出: [{"uName":"lmx","pwd":"123456","cId":"100"},{"uName":"jqy","pwd":"123","cId":"200"}]}/*** 8. json-lib 把 json字符串转换成 List*/public void getJSONObjectToList(){List<User> userList = new ArrayList<User>();String strJon = "[{\"cId\":\"100\",\"uName\":\"lmx\",\"pwd\":\"123\"},{\"cId\":\"200\",\"uName\":\"jqy\",\"pwd\":\"123456\"}]";JSONArray jsonArray = JSONArray.fromObject(strJon);for (int i = 0; i < jsonArray.size(); i++ ){JSONObject jsonObject = jsonArray.getJSONObject(i);User user = (User)JSONObject.toBean(jsonObject, User.class);userList.add(user);}for (User user : userList){System.out.println(user.getuName());// 输出: lmx jqy}}/*** 9. json-lib 把 Map 转换成 json字符串*/public void getMapToJson(){Map<String, User> map = new HashMap<String, User>();map.put("1", new User("100", "lmx", "123456"));map.put("2", new User("200", "jqy", "123"));JSONObject jsonMap = JSONObject.fromObject(map);System.out.println(jsonMap);// 输出:// {"1":{"uName":"lmx","pwd":"123456","cId":"100"},"2":{"uName":"jqy","pwd":"123","cId":"200"}}}/*** 10. json-lib 把 json字符串转换成Map*/public void getJsonToMap(){// json字符串转MapString strJon = "{\"1\":{\"cId\":\"100\",\"uName\":\"lmx\"},\"2\":{\"cId\":\"200\",\"uName\":\"jqy\"}}";Map map = (Map)JSONObject.fromObject(strJon);Set set = map.keySet();Iterator ite = set.iterator();while (ite.hasNext()){String key = (String)ite.next();JSONObject jsonObject = JSONObject.fromObject(map.get(key));User user = (User)JSONObject.toBean(jsonObject, User.class);System.out.println(key + " " + JSONObject.fromObject(user).toString());// 输出: 1 {"uName":"lmx","pwd":"","cId":"100"} 2{"uName":"jqy","pwd":"","cId":"200"}}}/*** 11. json-lib 把 JSONArray转换成 List*/public void getJSONArrayToList(){// List转型JSONArrayList<User> list = new ArrayList<User>();list.add(new User("100", "lmx", "123456"));list.add(new User("200", "jqy", "123"));JSONArray jsonArray = JSONArray.fromObject(list);System.out.println(jsonArray.toString());// 输出:[{"uName":"lmx","pwd":"123456","cId":"100"},{"uName":"jqy","pwd":"123","cId":"200"}]// JSONArray转型ListList<User> lists = JSONArray.toList(jsonArray, new User(), new JsonConfig());Iterator<User> iur = lists.iterator();while (iur.hasNext()){User user = iur.next();System.out.println(JSONObject.fromObject(user).toString());// 输出:{"uName":"lmx","pwd":"123456","cId":"100"}// {"uName":"jqy","pwd":"123","cId":"200"}}}/*** 12. json-lib 把JSONArray转换成数组*/public void getJSONArrayToArray(){boolean[] boolArray = new boolean[] {true, false, true};JSONArray jsonArray = JSONArray.fromObject(boolArray);Object obj[] = jsonArray.toArray();for (Object o : obj){System.out.println(o + " ");// 输出: true false true}}/*** 13. json-lib 把数组转换成 JSONArray*/public void getArrayToJSONArray(){boolean[] boolArray = new boolean[] {true, false, true};JSONArray jsonArray = JSONArray.fromObject(boolArray);System.out.println(jsonArray.toString());// 输出: [true,false,true]}/*** 14. json-lib 把XML转换成 JSON*/public void getXmlToJSON(){// XML转JSONString xml = "<root>" + "<uName>lmx</uName>" + "<pwd>123456</pwd>" + "<birthday>"+ "<year>1990</year>" + "<month>10</month>" + "<day>22</day>" + "</birthday>"+ "</root>";XMLSerializer xmlSerializer = new XMLSerializer();JSON json = xmlSerializer.read(xml);System.out.println(json.toString());// 输出:{"uName":"lmx","pwd":"123456","birthday":{"year":"1990","month":"10","day":"22"}}}/*** 14. json-lib 把JSON转换成 XML*/public void getJSONToXml(){String jsondata = "{\"uName\":\"lmx\",\"pwd\":\"123456\",\"birthday\":{\"year\":\"1990\",\"month\":\"10\",\"day\":\"22\"}}"; JSONObject jsonObject = JSONObject.fromObject(jsondata); String xmlstr = new XMLSerializer().write(jsonObject); System.out.println(xmlstr); // 输出: <?xml version="1.0" encoding="UTF-8"?><o><birthday class="object"><day type="string">22</day><month type="string">10</month><year type="string">1990</year></birthday><pwd type="string">123456</pwd><uName type="string">lmx</uName></o>}public static void main(String[] args){// TODO Auto-generated method stubSfJson sf = new SfJson();// 1System.out.println("showJsonObject:");sf.showJSONObject();// 2System.out.println("showJSONArrayAddJSONObject:");sf.showJSONArrayAddJSONObject();// 3System.out.println("showJSONArray:");sf.showJSONArray();// 4System.out.println("showJSONObjectAddJSONArray:");sf.showJSONObjectAddJSONArray();// 5System.out.println("getJSONObjectToBean:");sf.getJSONObjectToBean();// 6System.out.println("getBeanToJSONObject:");sf.getJSONObjectToBean();// 7System.out.println("getListToJSONArray:");sf.getListToJSONArray();// 8System.out.println("getJSONObjectToList:");sf.getJSONObjectToList();// 9System.out.println("getMapToJson:");sf.getMapToJson();// 10System.out.println("getJsonToMap:");sf.getJsonToMap();// 11System.out.println("getJSONArrayToList:");sf.getJSONArrayToList();// 12System.out.println("getJSONArrayToArray:");sf.getJSONArrayToArray();// 13System.out.println("getArrayToJSONArray:");sf.getArrayToJSONArray();// 14System.out.println("getXmlToJSON:");sf.getXmlToJSON();// 15System.out.println("getJSONToXml:");sf.getJSONToXml();}}