android网络通讯数据封装之 json

原文地址：android网络通讯数据封装之 json作者：yihu

Demo程序包括客户端和服务端

客户端按json数据格式封装数据传至服务端。

服务端为简单的servlet程序，负责接收客户端传到json数据，然后按原数据返回客户端.

实例代码如下:

</pre><pre name="code" class="html">public static String cmdLogIn() {
String urlString = "http://192.168.8.75:89/webroot/jsontest";
HttpPost request = new HttpPost(urlString);
try{
//json数据格式{"data":{"spring":"yes","java":"ok"},
"head": {"password":"123456","name":"rarnu"}}
//封装代码
JSONObject headParam = new JSONObject();
headParam.put("name", "yihu");
headParam.put("password", "123456");

JSONObject dataParam = new JSONObject();
dataParam.put("java", "ok");
dataParam.put("spring", "yes");

JSONObject paramss = new JSONObject();
paramss.put("head", headParam);
paramss.put("data", dataParam);
//json数据格式
{"data":[{"spring":"yes","java":"ok"}],
"head":[{"password":"123456","name":"yihu"},{"arry1":"java","classid":"321546"}]}

JSONArray headParams = new JSONArray();
//数组[0]
JSONObject headParam1 = new JSONObject();
headParam1.put("name", "yihu");
headParam1.put("password", "123456");
//数组[1]
JSONObject headParam2 = new JSONObject();
headParam2.put("arry1", "java");
headParam2.put("classid", "321546");
headParams.put(headParam1);
headParams.put(headParam2);

JSONArray dataParams = new JSONArray();
JSONObject dataParam = new JSONObject();
dataParam.put("java", "ok");
dataParam.put("spring", "yes");
dataParams.put(dataParam);

JSONObject paramss = new JSONObject();
paramss.put("head", headParams);
paramss.put("data", dataParams);

Log.v("tag", "params.toString() >>> :"+paramss.toString());
// 绑定到请求 Entry
StringEntity se = new StringEntity(paramss.toString());
request.setEntity(se);
// 发送请求
HttpResponse httpResponse = new DefaultHttpClient().execute(request);
int statusCode = httpResponse.getStatusLine().getStatusCode();
Log.v("tag", "statusCode <- :"+statusCode);
if (statusCode == 200) {
InputStream entityStream;
try {
entityStream = httpResponse.getEntity().getContent();
String jsonString = convertStreamToString(entityStream);
Log.v("tag", "jsonString <- :"+jsonString);
if ("".equals(jsonString))
return null;
JSONObject json = new JSONObject(jsonString);
JSONObject head = json.getJSONObject("head");
Log.v("TAG", "name >> :"+head.optString("name"));

return json.optString("java");
}catch (Exception e) {
}
}
}catch (Exception e) {
}
return null;
}

private static String convertStreamToString(InputStream is) {
StringBuilder sb = new StringBuilder();
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "UTF-8"), 8 * 1024);
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "n");
}
} catch (IOException e) {
sb.delete(0, sb.length());
} finally {
try {
is.close();
} catch (IOException e) {

}
}
return sb.toString();
}

服务端测试代码

public class LoadServlet extends HttpServlet {
public void destroy() {
super.destroy();
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
StringBuffer messagebuffer = new StringBuffer();
javax.servlet.ServletInputStream in = request.getInputStream();
DataInputStream din = new DataInputStream(in);
int ch;
while ((ch = din.read()) != -1)
messagebuffer.append((char) ch);
din.close();

String message = messagebuffer.toString();
System.out.println("content...>>>:" + message);

ByteArrayOutputStream bout = new ByteArrayOutputStream();
DataOutputStream dout = new DataOutputStream(bout);
byte str[] = message.getBytes("UTF-8");
dout.write(str);
byte data[] = bout.toByteArray();
OutputStream out = response.getOutputStream();
out.write(data);
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
public void init() throws ServletException {
}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet>
<description>jsontest</description>
<display-name>jsontest</display-name>

<servlet-name>jsonServlet</servlet-name>
<servlet-class>com.yihu.json.servlet.LoadServlet</servlet-class>

</servlet>
<servlet-mapping>
<servlet-name>jsonServlet</servlet-name>
<url-pattern>/jsontest</url-pattern>
</servlet-mapping>
</web-app>