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////2 System.out.print(surveyListVO.getResult().get(i) .getSurveyName()); print: B///C System.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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