如果你需要下载Gson（在Android studio中不需要下载加载添加即可）请到

http://download.csdn.net/detail/qq_30034925/9813069

中下载，或者在本文末端连接的源码中有。
Gson作为谷歌的亲儿子使用的还是比较广泛，下面将会完成一个利用Gson解析json的案例，因为做为测试用的，所以不做Android studio例子，而是在Eclipse中完成。但是代码是通用的。
案例概述：一个查询快递的源码
如果需要了解Gson的详细内容请看

http://blog.csdn.net/qq_30034925/article/details/70162308

json的内容

{"message": "ok","nu": "612879710880","ischeck": "1","condition": "F00","com": "shunfeng","status": "200","state": "3","data": [{"time": "2017-03-14 12:48:19","ftime": "2017-03-14 12:48:19","context": "已签收,感谢使用顺丰,期待再次为您服务","location": "null"},{"time": "2017-03-14 08:37:09","ftime": "2017-03-14 08:37:09","context": "快件交给杨玉麟，正在派送途中（联系电话：15920977099）","location": "null"},{"time": "2017-03-14 07:54:49","ftime": "2017-03-14 07:54:49","context": "正在派送途中,请您准备签收(派件人:苏镜昌,电话:13924282546)","location": "null"},{"time": "2017-03-14 07:26:34","ftime": "2017-03-14 07:26:34","context": "快件到达 【广州花都红棉大道营业部】","location": "【广州花都红棉大道营业部】"},{"time": "2017-03-14 00:24:58","ftime": "2017-03-14 00:24:58","context": "快件在【广州新塘集散中心】已装车，准备发往 【广州花都红棉大道营业部】","location": "【广州花都红棉大道营业部】"},{"time": "2017-03-13 20:21:24","ftime": "2017-03-13 20:21:24","context": "快件到达 【广州新塘集散中心】","location": "null"},{"time": "2017-03-13 18:59:03","ftime": "2017-03-13 18:59:03","context": "快件在【广州天河广利路营业部】已装车，准备发往 【广州新塘集散中心】","location": "【广州天河广利路营业部】"},{"time": "2017-03-13 18:01:07","ftime": "2017-03-13 18:01:07","context": "顺丰速运 已收取快件","location": "null"}]
}

我们需要实体类bean。但是创建起来很多，安利一个网站http://www.bejson.com/json2javapojo/new/
这里面可以是json直接生成bean，这样还可以保证不会输错名字，同时该网站还可以在线把json格式化
过程：打开http://www.bejson.com/json2javapojo/new/

在文本框中输入json内容。点击生成JavaBean即可，然后点击下载代码。
生成的类

JsonRootBean.class

public class JsonRootBean {private String message;private String nu;private String ischeck;private String condition;private String com;private String status;private String state;private List<Data> data;public void setMessage(String message) {this.message = message;}@Overridepublic String toString() {return "JsonRootBean [message=" + message + ", nu=" + nu + ", ischeck=" + ischeck + ", condition=" + condition+ ", com=" + com + ", status=" + status + ", state=" + state + "]";}public String getMessage() {return message;}public void setNu(String nu) {this.nu = nu;}public String getNu() {return nu;}public void setIscheck(String ischeck) {this.ischeck = ischeck;}public String getIscheck() {return ischeck;}public void setCondition(String condition) {this.condition = condition;}public String getCondition() {return condition;}public void setCom(String com) {this.com = com;}public String getCom() {return com;}public void setStatus(String status) {this.status = status;}public String getStatus() {return status;}public void setState(String state) {this.state = state;}public String getState() {return state;}public void setData(List<Data> data) {this.data = data;}public List<Data> getData() {return data;}}

Data.class

public class Data {private String time;private String ftime;private String context;private String location;public void setTime(String time) {this.time = time;}public String getTime() {return time;}@Overridepublic String toString() {return "Data [time=" + time + ", ftime=" + ftime + ", context=" + context + ", location=" + location + "]";}public void setFtime(String ftime) {this.ftime = ftime;}public String getFtime() {return ftime;}public void setContext(String context) {this.context = context;}public String getContext() {return context;}public void setLocation(String location) {this.location = location;}public String getLocation() {return location;}}

GsonTest.class

public class GsonTest {//访问网络 ，返回的是一个json内容public static String downloadWeb(String url) // 截取的网页所有内�?{String result = ""; // 定义�?个字符串用来存储网页内容BufferedReader in = null; // 定义�?个缓冲字符输入流InputStream is = null;try {URL realUrl = new URL(url);// 初始化一个链接到那个url的连�?HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();// 设置请求方法connection.setDoInput(true); // 允许输入流，即允许下载connection.setDoOutput(true); // 允许输出流，即允许上传connection.setUseCaches(true); // 不使用缓冲connection.setRequestMethod("GET"); // 使用get请求// 获取输入流is = connection.getInputStream();InputStreamReader isr = new InputStreamReader(is);in = new BufferedReader(isr);// 用来临时存储抓取到的每一行的数据String line;while ((line = in.readLine()) != null) {// 遍历抓取到的每一行并将其存储到result里面result += line;}} catch (Exception e) {System.out.println("发�?�GET请求出现异常�?" + e);e.printStackTrace();} finally { // 使用finally来关闭输入流try {if (in != null) {in.close();}} catch (Exception e2) {e2.printStackTrace();}}try {result = new String(result.getBytes(), "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}return result;}public static void main(String[] args) {//http://www.kuaidi100.com/query?type=快递公司代号&postid=快递单号 //ps:快递公司编码:申通="shentong" EMS="ems" 顺丰="shunfeng" 圆通="yuantong" 中通="zhongtong" 韵达="yunda" 天天="tiantian" 汇通="huitongkuaidi" 全峰="quanfengkuaidi" 德邦="debangwuliu" 宅急送="zhaijisong"String result = downloadWeb("http://www.kuaidi100.com/query?type=ems&postid=9890533739217");Gson gson = new Gson();JsonRootBean bean = gson.fromJson(result, JsonRootBean.class);System.out.println(bean.toString());List<Data>datas = bean.getData();for(Data data:datas){System.out.println("快递状态"+data.getContext());}}}

运行结果

最后源码下载地址
http://download.csdn.net/download/qq_30034925/9813438