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JAVA使用Gson解析json数据实例解析

2019年07月22日  | 移动技术网IT编程  | 我要评论

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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