java gson解析JSON

//  json对象 转换成 json字符串

Gson gson = new Gson();
List<Person> persons = new ArrayList<Person>();
for (int i = 0; i < 10; i++) {
     Person p = new Person();
     p.setName("name" + i);
     p.setAge(i * 5);
     persons.add(p);
}
String str = gson.toJson(persons);

// 结果： [{"name":"name0","age":0},{"name":"name1","age":5},{"name":"name2","age":10}]

//  json字符串 转换成 json对象

List<Person> ps = gson.fromJson(str, new TypeToken<List<Person>>(){}.getType());
for(int i = 0; i < ps.size() ; i++)
{
     Person p = ps.get(i);
     System.out.println(p.toString());
}

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: 12
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();
}
}

原创作者路径：http://www.zzvips.com/article/55855.html