Android客户端与服务器HTTP交互，数据以json格式传输

/**
 * HTTP请求服务器
 * @author lz
 */
public class HttpRequestServer{
private String serverCategoryStr = "http://192.168.1.2:8080/ChatXXX/";// 服务器地址
private String url = "http://192.168.1.4:8080/ChatXXX/login";
private static final int REQUEST_TIMEOUT = 1 * 1000;// 设置请求超时10秒钟
private static final int SO_TIMEOUT = 5 * 1000; // 设置等待数据超时时间10秒钟
private static final int type=-1;//请求Type

public HttpRequestServer() {

}

/**
 * 用户登录
 * @param name
 * @param pwd
 * @return
 * @throws ClientProtocolException
 * @throws JSONException
 * @throws IOException
 */
public JSONObject login(String name, String pwd)
throws ClientProtocolException, JSONException, IOException {
url = serverCategoryStr + Constants.URL_LOGIN;
JSONObject param = new JSONObject();
param.put(Constants.TYPE, Constants.LOGIN);
param.put(Constants.USER_NAME, name);
param.put(Constants.USER_PASSWORD, pwd);
return requestServer(Constants.LOGIN, param);
}


/**
 * 通用请求服务器函数
 * @param userId
 * @param name
 * @param pwd
 * @param requestType
 * @param status
 * @return
 * @throws JSONException
 * @throws ClientProtocolException
 * @throws IOException
 */
private JSONObject requestServer(String requestType,JSONObject param) throws JSONException,
ClientProtocolException, IOException {
// 不加这一段则会报错，错误信息为android.os.networkonmainthreadexception
// 在Android2.2以后必须添加以下代码
// 本应用采用的Android4.0
// 设置线程的策略
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
.permitAll() // 此处为允许磁盘读写和网络访问
.penaltyLog() // 打印logcat，当然也可以定位到dropbox，通过文件保存相应的log
.build());
HttpPost request = new HttpPost(url);
// 绑定到请求 Entry
StringEntity se = new StringEntity(param.toString(),"utf-8");
request.setEntity(se);
// 发送请求
HttpClient httpclient = getHttpClient();
HttpResponse httpResponse = httpclient.execute(request);
JSONObject result = null;
int code=httpResponse.getStatusLine().getStatusCode();
if (code == 200) {
// 得到应答的字符串，这也是一个 JSON 格式保存的数据
String retSrc = null;
retSrc = EntityUtils.toString(httpResponse.getEntity(),"utf-8");
JSONObject jtmpJsonObject = new JSONObject(retSrc);
String str = jtmpJsonObject.getString("dataMap");// 此处"dataMap"与服务器关联
result = new JSONObject(str);
}
return result;
}
private HttpClient getHttpClient() {
BasicHttpParams httpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParams, REQUEST_TIMEOUT);
HttpConnectionParams.setSoTimeout(httpParams, SO_TIMEOUT);
HttpClient httpclient = new DefaultHttpClient(httpParams);
return httpclient;
}