Android 登陆功能的实现（访问WebServices 解析返回的JSON结果）

  1 import android.os.Bundle;
  2 import android.os.Message;
  3 import android.util.Log;
  4 import android.widget.Toast;
  5 
  6 import com.google.gson.Gson;
  7 import com.google.gson.JsonArray;
  8 import com.google.gson.JsonElement;
  9 import com.google.gson.JsonParser;
 10 import com.google.gson.reflect.TypeToken;
 11 
 12 
 13 import org.apache.http.HttpResponse;
 14 import org.apache.http.client.entity.UrlEncodedFormEntity;
 15 import org.apache.http.client.methods.HttpGet;
 16 import org.apache.http.client.methods.HttpPost;
 17 import org.apache.http.impl.client.DefaultHttpClient;
 18 import org.apache.http.message.BasicNameValuePair;
 19 import org.apache.http.protocol.HTTP;
 20 import org.json.JSONArray;
 21 import org.json.JSONException;
 22 import org.json.JSONObject;
 23 
 24 import java.io.BufferedReader;
 25 import java.io.IOException;
 26 import java.io.InputStream;
 27 import java.io.InputStreamReader;
 28 import java.util.ArrayList;
 29 import java.util.List;
 30 
 31 import static java.net.Proxy.Type.HTTP;
 32 //判读账号、密码
 33 public static String GetUsers(String code, String pwd) {
 34         String result = "";
 35         InputStreamReader in = null;
 36         try {
 37             final String SERVER_URL = GlobalAppliaction.WebUrl + "LogIn"; // 定义需要获取的内容来源地址
 38             HttpPost request = new HttpPost(SERVER_URL); // 根据内容来源地址创建一个Http请求
 39 
 40             List params = new ArrayList();
 41             params.add(new BasicNameValuePair("username", code)); // 添加必须的参数
 42             params.add(new BasicNameValuePair("userpwd", pwd)); // 添加必须的参数
 43             request.setEntity(new UrlEncodedFormEntity(params, org.apache.http.protocol.HTTP.UTF_8)); // 设置参数的编码
 44 
 45 
 46             HttpResponse httpResponse = new DefaultHttpClient().execute(request); // 发送请求并获取反馈
 47 
 48             // 解析返回的内容
 49             if (httpResponse.getStatusLine().getStatusCode() != 404) {
 50                 InputStream inputStream = httpResponse.getEntity().getContent();
 51                 in = new InputStreamReader(inputStream);
 52                 BufferedReader bufferedReader = new BufferedReader(in);
 53 
 54                 StringBuffer strBuffer = new StringBuffer();
 55                 String line = null;
 56                 while ((line = bufferedReader.readLine()) != null) {
 57                     strBuffer.append(line);
 58                 }
 59                 inputStream.close();
 60                 bufferedReader.close();
 61                 result = strBuffer.toString();
 62                 String errCode = "";                
 63                 String strresult = "";
 64                 JSONObject root = new JSONObject(result);
 65                 errCode = root.getString("Code");
 66 
 67               
 68                 if (errCode.equals("1")) {
 69 
 70                     strresult = root.getString("Result");
 71 /*
 72                     JSONArray resultArray = new JSONArray(strresult);//解析result
 73                     JSONObject resultobj = resultArray.getJSONObject(0);
 74                      resultobj.getString("UserName");
 75                    resultobj.getString("UserPwd");
 76                    */
 77 
 78                     result = strresult;
 79                     return result;
 80                 } else {
 81                     return "-1";
 82                 }
 83 
 84 
 85             }
 86 
 87 
 88         } catch (IOException e) {
 89             e.printStackTrace();
 90             Log.d("debug", e.toString());
 91             return "404";
 92         } catch (JSONException e) {
 93             e.printStackTrace();
 94             Log.d("debug", e.toString());
 95 
 96         } finally {
 97 
 98             if (in != null) {
 99                 try {
100                     in.close();
101                 } catch (IOException e) {
102                     e.printStackTrace();
103                 }
104             }
105         }
106         return result;
107     }