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[操作系统]三种POST和GET的提交方式


      向服务器提交数据有两种方式,post和get。两者的区别主要有三点,安全性、长度限制、数据结构。其中get请求安全性相比较而言较差,数据长度受浏览器地址栏限制,没有方法体。两种都是较为重要的数据提交方式。现简单介绍一下三种post和get的提交方式。无论是哪种方法实现post和get,get 的访问路径都要携带数据,而post提交是把数据放在方法体中。

     普通方法实现get/post提交:    

     严格遵照Http协议进行数据传输。在安卓开发环境下,由于主线程不能进行网络访问,因此需要在开启一个子线程向服务器提交数据。为了更加直观的观察数据,可以在程序屏幕上显示服务器反馈信息。又由于子线程无法更改UI界面,因此需要引入Hnndler代理器。实现get/post提交基本步骤就是,获取URL路径,根据路径得到Http连接,用HttpURLConnection对象设置相关的http配置信息、提交方式以及获取反馈码。当响应码为200时表示提交成功,可以通过HttpURLConnection以流的形式获取反馈信息。 

         普通GRT提交方式:

public void load(View view){		final String qq = et_qq.getText().toString().trim();		final String pwd = et_pwd.getText().toString().trim();		if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) {			Toast.makeText(MainActivity.this, "qq号或密码为空", 0).show();	  	return;		}		final String path = "http://192.168.1.114:8080/qqload/qqload?qq=" + qq				+ "&pwd=" + pwd;		new Thread() {			public void run() {				try {					URL url = new URL(path);					HttpURLConnection conn = (HttpURLConnection) url							.openConnection();					conn.setRequestMethod("GET");					conn.setReadTimeout(5000);					int code = conn.getResponseCode();					if (code == 200) {						InputStream is = conn.getInputStream();						String result = StreamTools.ReadStream(is);						Message msg = Message.obtain();						msg.what = SUCCESS;						msg.obj = result;						handler.sendMessage(msg);					} else {						Message msg = Message.obtain();						msg.what = ERROR1;						handler.sendMessage(msg);					}				} catch (Exception e) {					// TODO Auto-generated catch block					e.printStackTrace();					Message msg = Message.obtain();					msg.what = ERROR2;					handler.sendMessage(msg);				}			}		}.start();	}

  

         普通POST提交方式:

public void load(View view){    final String qq = et_qq.getText().toString().trim();    final String pwd = et_pwd.getText().toString().trim();    if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) {      Toast.makeText(MainActivity.this, "qq号或密码为空", 0).show();      return;    }    final String path = "http://192.168.1.114:8080/qqload/qqload";    new Thread() {      public void run() {        try {          URL url = new URL(path);          HttpURLConnection conn = (HttpURLConnection) url              .openConnection();          conn.setRequestMethod("POST");          conn.setReadTimeout(5000);          conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");          String data = "qq="+URLEncoder.encode(qq,"utf-8")+"&pwd=" + URLEncoder.encode(pwd,"utf-8");           conn.setRequestProperty("Content-Length",String.valueOf(data.length()));          conn.setDoOutput(true);          conn.getOutputStream().write(data.getBytes());          int code = conn.getResponseCode();          if (code == 200) {            InputStream is = conn.getInputStream();            String result = StreamTools.ReadStream(is);            Message msg = Message.obtain();            msg.what = SUCCESS;            msg.obj = result;            handler.sendMessage(msg);          } else {            Message msg = Message.obtain();            msg.what = ERROR1;            handler.sendMessage(msg);          }        } catch (Exception e) {          // TODO Auto-generated catch block          e.printStackTrace();          Message msg = Message.obtain();          msg.what = ERROR2;          handler.sendMessage(msg);        }      }    }.start();  }

 

       用httpclien实现get/post提交的只需要一下几个步骤:

       1.     创建HttpClient对象,实现打开浏览器的功能

                       HttpClient client = new DefaultHttpClient();

   2.     输入地址或者数据 ,用到HttpGet()或HttpPost(),传入要访问的路径,得到HttpGet或HttpPost对象。

            HttpGet  httpGet = new HttpGet(path);

  3.     把获得的HttpGet或HttpPost对象发送到服务器,实现敲回车的功能,得到HttpResponse对象。

        HttpResponse response = client.execute(httpGet);

  4.     得到HttpResponse对象获取状态行中的状态码,判断状态码状态码。

         int code = response.getStatusLine().getStatusCode();

  5.     同样用HttpResponse对象获取相应内容,存入流对象。最后将得到的流对象转为字符串进行显示。

         InputStream is = response.getEntity().getContent();

    其中要注意的一点是用post请求时要传递值所以要多出一个步骤。具体而言,先创建一个list集合,集合的泛型用NameValuePair表示,类似于键值对的形式存储要传递的数据。接着向集合中添加要提交数据。最后用HttpPost对象把集合存入请求体中。

           用HttpClient实现GET提交:

public void load(View view){    final String qq = et_qq.getText().toString().trim();    final String pwd = et_pwd.getText().toString().trim();    if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) {      Toast.makeText(MainActivity.this, "qq号或密码为空", 0).show();      return;    }    final String path = "http://192.168.1.114:8080/qqload/qqload?qq=" + qq        + "&pwd=" + pwd;    new Thread() {      public void run() {        try {          HttpClient client = new DefaultHttpClient();          HttpGet httpget = new HttpGet(path);          HttpResponse response = client.execute(httpget);          int code = response.getStatusLine().getStatusCode();          if (code == 200) {            InputStream is = response.getEntity().getContent();            String result = StreamTools.ReadStream(is);            Message msg = Message.obtain();            msg.what = SUCCESS;            msg.obj = result;            handler.sendMessage(msg);          } else {            Message msg = Message.obtain();            msg.what = ERROR1;            handler.sendMessage(msg);          }        } catch (Exception e) {          // TODO Auto-generated catch block          e.printStackTrace();          Message msg = Message.obtain();          msg.what = ERROR2;          handler.sendMessage(msg);        }      }    }.start();  }

 

             用HttpClient实现POST提交:    

  public void load(View view){    final String qq = et_qq.getText().toString().trim();    final String pwd = et_pwd.getText().toString().trim();    if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) {      Toast.makeText(MainActivity.this, "qq号或密码为空", 0).show();      return;    }    final String path = "http://192.168.1.114:8080/qqload/qqload";    new Thread() {      public void run() {        try {          HttpClient client = new DefaultHttpClient();          HttpPost httppost = new HttpPost(path);          List<NameValuePair> parameter = new ArrayList();          parameter.add(new BasicNameValuePair("qq", qq));          parameter.add(new BasicNameValuePair("pwd", pwd));          httppost.setEntity(new UrlEncodedFormEntity(parameter,"utf-8"));          HttpResponse response = client.execute(httppost);          int code = response.getStatusLine().getStatusCode();          if (code == 200) {            InputStream is = response.getEntity().getContent();            String result = StreamTools.ReadStream(is);            Message msg = Message.obtain();            msg.what = SUCCESS;            msg.obj = result;            handler.sendMessage(msg);          } else {            Message msg = Message.obtain();            msg.what = ERROR1;            handler.sendMessage(msg);          }        } catch (Exception e) {          // TODO Auto-generated catch block          e.printStackTrace();          Message msg = Message.obtain();          msg.what = ERROR2;          handler.sendMessage(msg);        }      }    }.start();  }

 

         

        使用开源框架实现get/post提交:

        利用框架实现get/post提交不需要再开启子线程。直接在主线程进行get/post的提交,大大的减少了工作量。但操作前需要导包。然后直接创建一个AsyncHttpClient对象,用AsyncHttpClient对象的post方法和get方法,发送请求,并在AsyncHttpResponseHandler()对象中获得相应信息。同样若是post请求,仍旧需要传递值。这里可以用RequestParams对象添加要传递的值。

         在文件下添加jar包:

                           

           用开源框架实现GET提交:

public void load(View view){    final String qq = et_qq.getText().toString().trim();    final String pwd = et_pwd.getText().toString().trim();    if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) {      Toast.makeText(MainActivity.this, "qq号或密码为空", 0).show();      return;    }    final String path = "http://192.168.1.114:8080/qqload/qqload?qq=" + qq        + "&pwd=" + pwd;    AsyncHttpClient client = new AsyncHttpClient();    client.get(path, new AsyncHttpResponseHandler() {            @Override      public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {        // TODO Auto-generated method stub        tv_result.setText(new String(responseBody));      }            @Override      public void onFailure(int statusCode, Header[] headers,          byte[] responseBody, Throwable error) {        // TODO Auto-generated method stub        tv_result.setText("错误原因:" + new String(responseBody));      }    });  }

 

     

        用开源框架实现POST请求:

  public void load(View view){    final String qq = et_qq.getText().toString().trim();    final String pwd = et_pwd.getText().toString().trim();    if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) {      Toast.makeText(MainActivity.this, "qq号或密码为空", 0).show();      return;    }    final String path = "http://192.168.1.114:8080/qqload/qqload";    AsyncHttpClient client = new AsyncHttpClient();    RequestParams params = new RequestParams();    params.add("qq", qq);    params.add("pwd", pwd);    client.post(path,params,new AsyncHttpResponseHandler() {            @Override      public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {        // TODO Auto-generated method stub        tv_result.setText(new String(responseBody));      }            @Override      public void onFailure(int statusCode, Header[] headers,          byte[] responseBody, Throwable error) {        // TODO Auto-generated method stub        tv_result.setText(new String(responseBody));      }    });  }

       

          通过以上任何一种方式可以实现的功能是,从安卓手机端提交数据到服务器端,服务器端进行判断,并返回相应的结果。三种方式各有利弊,实现效果相同,在实际的使用过程中可以根据本身的需要进行选择。