JAVA使用Gson解析json数据实例解析

2019-11-26 14:31:02

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JSON(JavaScript Object Notation) 是一种轻量级的数据交换格式，易于阅读和编写，同时也易于机器解析和生成。同XML一样是一种“传输格式”。JSON采用与编程语言无关的文本格式，便于数据传输、存储、交换。

封装类Attribute：

public class Attribute {private int id;private String name;private int age;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}}

另一个封装类GsonDataAnalysis：

public class GsonDataAnalysis {private List<Attribute> list;public List<Attribute> getList() {return list;}public void setList(List<Attribute> list) {this.list = list;}}

测试类Main方法：

/*** Gson解析json数据* @author ForeverLover* @version 2015-04-19*/public class GsonTest {public static void main(String[] args) {String sTotalString = "{/"list/": [" +"{/"id/":/"1/",/"name/":/"Tom/",/"age/":/"12/"}," +"{/"id/":/"2/",/"name/":/"Marry/",/"age/":/"18/"}" +"]}";Gson gson = new Gson();GsonDataAnalysis gda = gson.fromJson(sTotalString, GsonDataAnalysis.class);for(int i = 0; i < gda.getList().size(); i ++) {System.out.print("ID号：" + gda.getList().get(i).getId() + " ");System.out.print("姓 名：" + gda.getList().get(i).getName() + " ");System.out.println("年 龄：" + gda.getList().get(i).getAge());}}}

注：在使用Gson类的时候在工程中要添加Gson.jar包。

下面给大家介绍java 解析json格式数据

有时候可能会用到json格式进行数据的传输，那么怎么把接收到的数据解析出来呢？下面介绍两种解析json数据的方法：

1、通过谷歌的Gson来进行解析：

json数据：sTotalString = {"message":"success","result":[{"surveyid":"1","surveyname":"B"}{surveyid":"2","surveyname":"C"}]};

两个VO类：

public class SurveyVO {private String surveyId;private String surveyName;private String message;public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}public String getSurveyId() {return surveyId;}public void setSurveyId(String surveyId) {this.surveyId = surveyId;}public String getSurveyName() {return surveyName;}public void setSurveyName(String surveyName) {this.surveyName = surveyName;}}public class SurveyListVO {private String message;private List<SurveyVO> result;public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}public List<SurveyVO> getResult() {return result;}public void setResult(List<SurveyVO> result) {this.result = result;} }

json格式转换成object类型：

public class fromGson() {sTotalString = {"message":"success","result":[{"surveyid":"1","surveyname":"B"}{"surveyid":"2","surveyname":"C"}]};Gson gson = new Gson();SurveyListVO surveyListVO = gson.fromJson(sTotalString,SurveyListVO.class);for (int i = 0; i < surveyListVO.getResult().size(); i++) {System.out.print(surveyListVO.getResult().get(i).getSurveyId());print: 1////2System.out.print(surveyListVO.getResult().get(i).getSurveyName());print: B///CSystem.out.print(surveyListVO.getMessage());}}

2、通过json-org.jar包进行解析：

json数据：sTotalString = {"message":"success","result":[{"surveyid":"1","surveyname":"B"}{surveyid":"2","surveyname":"C"}]};

一个VO类：

public class SurveyVO {private String surveyId;private String surveyName;public String getSurveyId() {return surveyId;}public void setSurveyId(String surveyId) {this.surveyId = surveyId;}public String getSurveyName() {return surveyName;}public void setSurveyName(String surveyName) {this.surveyName = surveyName;}}

json格式转换成object类型：

public class fromJson() {sTotalString = {"message":"success","result":[{"surveyid":"1","surveyname":"B"}{"surveyid":"2","surveyname":"C"}]};JSONObject json;try {json = new JSONObject(sTotalString);JSONArray results = json.getJSONArray("result");for (int i = 0; i < results.length(); i++) {SurveyVO surveyVO = new SurveyVO();JSONObject result = results.getJSONObject(i);System.out.println(result.getString("surveyId")+" "+result.getString("surveyName"));surveyVO.setSurveyId(result.getString("surveyId"));surveyVO.setSurveyName(result.getString("surveyName"));surveyVOList.add(surveyVO);}} catch (JSONException e) {e.printStackTrace();}}

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