Android传统HTTP请求get----post方式提交数据(包括乱码问题)

1.模仿登入页面显示（使用传统方式是面向过程的）

使用Apache公司提供的HttpClient  API是面向对象的

(文章底部含有源码的连接，包括了使用async框架)

（解决中文乱码的问题。主要是对中文的数据进行URL编码）

android手机默认的编码是UTF-8

2.手机截图Demo

3.server截图

代码例如以下：

server端的代码：

//測试 android设备登入
public class Login extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		
		String username = request.getParameter("username");
		String password = request.getParameter("password");
		
		//对数据进行编码，解决乱码问题
		username  = new String(username.getBytes("ISO-8859-1"),"UTF-8");
		System.out.println("username--:"+username+"---password:"+password);
		
		if(username.equals("admin") && password.equals("123")){
			response.getOutputStream().write("登入成功".getBytes("UTF-8"));
		}else{
			response.getOutputStream().write("登入失败".getBytes("UTF-8"));
		}
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
//		request.setCharacterEncoding("UTF-8");
		doGet(request, response);

	}

}

Androidclient

布局文件的部分：

//測试 android设备登入
public class Login extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		
		String username = request.getParameter("username");
		String password = request.getParameter("password");
		
		//对数据进行编码，解决乱码问题
		username  = new String(username.getBytes("ISO-8859-1"),"UTF-8");
		System.out.println("username--:"+username+"---password:"+password);
		
		if(username.equals("admin") && password.equals("123")){
			response.getOutputStream().write("登入成功".getBytes("UTF-8"));
		}else{
			response.getOutputStream().write("登入失败".getBytes("UTF-8"));
		}
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
//		request.setCharacterEncoding("UTF-8");
		doGet(request, response);

	}

}

Activity代码部分：

（注意：android4.0之后訪问网络必须开子线程进行訪问，而且涉及到权限。记得加上訪问网络的权限

以下的代码中，我写入get和post两种方式的线程请求。。

。。。。。

。。。

。。。慢慢体会

）

public class MainActivity extends AppCompatActivity {
    private static final int SUCCESS = 0;
    private static final int FAILE = 1;
    private static final int NET_ERROR = 3;
    private static final String TAG = "MainActivity";
    EditText et_username;
    EditText et_password;
    TextView show_result;
    String username;
    String password;

    final String path = "http://188.188.7.85/Android_Server/Login";

    Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            int what = msg.what;

            switch (what) {
                case SUCCESS:
                    String data = (String) msg.obj;
                    show_result.setText(data);
                    break;
                case FAILE:
                    Toast.makeText(MainActivity.this, "连接server失败", Toast.LENGTH_SHORT).show();
                    break;
                case NET_ERROR:
                    Toast.makeText(MainActivity.this, "网络出现异常", Toast.LENGTH_SHORT).show();
                    break;
                default:
                    break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_username = (EditText) findViewById(R.id.et_username);
        et_password = (EditText) findViewById(R.id.et_password);
        show_result = (TextView) findViewById(R.id.show_result);

        username = et_username.getText().toString().trim();
        password = et_password.getText().toString().trim();
    }

    public void login(View view) {
        username = et_username.getText().toString().trim();
        password = et_password.getText().toString().trim();

        if (TextUtils.isEmpty(username) || TextUtils.isEmpty(password)) {
            Toast.makeText(this, "username与password不能为空", Toast.LENGTH_SHORT).show();
            return;
        }

        //使用传统get方式的请求server
//        new Thread_get().start();


        //使用传统的post方式请求server
        new Thread_post().start();

    }

    //传统的post方式请求server端
    class Thread_post extends Thread {
        @Override
        public void run() {
            try {
                URL url = new URL(path);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();

                //1.设置请求方式
                conn.setRequestMethod("POST");
                conn.setConnectTimeout(5000); //设置连接的超时事件是5秒

                //2.组合数据,一定要将数据进行URL编码
                String commitData = "username="+URLEncoder.encode(username,"UTF-8")+"&password="+URLEncoder.encode(password,"UTF-8");

                // 3. 指定content-type -实际上就是指定传输的数据类型
                conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");


                //4.指定content-length Content-Length: 数据的长度
                conn.setRequestProperty("Content-Length", commitData.length() + "");

                //5.打开输出流。告诉server，我要写数据了
                conn.setDoOutput(true);


                //6.開始写数据
                OutputStream os = conn.getOutputStream();
                os.write(commitData.getBytes());
//                os.close();

                int code = conn.getResponseCode();  //获取返回的成功代码
                Log.i(TAG, "code:---" + code);

                if (code == 200) {
                    //表示连接server成功返回信息
                    String data = ServerTools.getInfo(conn.getInputStream());

                    Log.i(TAG, "data:---" + data);
                    //使用消息处理机制，将数据传递给主线程
                    Message ms = new Message();
                    ms.what = SUCCESS;
                    ms.obj = data;
                    handler.sendMessage(ms);
                } else {
                    //使用消息处理机制，将数据传递给主线程
                    Message ms = new Message();
                    ms.what = FAILE;
                    handler.sendMessage(ms);
                }

            } catch (Exception e) {

                //使用消息处理机制，将数据传递给主线程
                Message ms = new Message();
                ms.what = NET_ERROR;
                handler.sendMessage(ms);
                e.printStackTrace();
            }
        }
    }

    //传统的get方式请求server端
    class Thread_get extends Thread {
        @Override
        public void run() {
            try {
                String getPath = path +
                        "?username=" + URLEncoder.encode(username, "UTF-8") +
                        "&password=" + URLEncoder.encode(password, "UTF-8");
                URL url = new URL(getPath);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();

                conn.setRequestMethod("GET");
                conn.setConnectTimeout(5000); //设置连接的超时事件是5秒
                int code = conn.getResponseCode();  //获取返回的成功代码

                Log.i(TAG, "code:---" + code);
                ;

                if (code == 200) {
                    //表示连接server成功返回信息
                    String data = ServerTools.getInfo(conn.getInputStream());

                    Log.i(TAG, "data:---" + data);
                    //使用消息处理机制，将数据传递给主线程
                    Message ms = new Message();
                    ms.what = SUCCESS;
                    ms.obj = data;
                    handler.sendMessage(ms);
                } else {
                    //使用消息处理机制，将数据传递给主线程
                    Message ms = new Message();
                    ms.what = FAILE;
                    handler.sendMessage(ms);
                }

            } catch (Exception e) {

                //使用消息处理机制，将数据传递给主线程
                Message ms = new Message();
                ms.what = NET_ERROR;
                handler.sendMessage(ms);
                e.printStackTrace();
            }
        }
    }

}

工具类:

public class ServerTools {

    //从服务端获取流数据进行转化成文本文件
    public static String getInfo(InputStream in) {

        //将数据流写在内存中
        ByteArrayOutputStream raf = new ByteArrayOutputStream();
        String data = null;

        try{
            byte[] bt = new byte[1024];
            int len =0 ;
            while((len = in.read(bt)) != -1){
                raf.write(bt,0,len);
            }

           data = raf.toString();
        }catch (Exception e){
            e.printStackTrace();
        }

        return data;
    }
}

Android的源码已经放在github中：

传统方式Demo地址：https://github.com/momxmo/HTTP_get_post

Apache提供的HttpClient API面向对象的方式Demo：https://github.com/momxmo/HttpClient_get_post

使用async-http-master流行框架进行http请求：https://github.com/momxmo/Http_android-async-http-master_Demo