post請求方式和get請求方式等網絡請求方式總結

一，幾種請求方式的解析
第一種：get請求方式請求數據
向服務器發索取數據的一種請求，get是獲取信息，而不是修改信息，數據不會被修改，get請求的參數會跟在url(路徑)後進行傳遞，請求的數據會附在URL之後，以？分割URL和傳輸數據，參數之間以&相連。
String url="http://192.168.1.117:8080/web2/servlet/LoginServlet?name="+URLEncoder.encode(name)+"&pass="+pass;
get傳輸的數據有大小限制，因爲GET是通過url提交數據，不同的瀏覽器對URL的長度的限制是不同的。get請求的數據會被瀏覽器緩存起來，用戶名和密碼將明文出現在URL上，其他人可以查到歷史瀏覽記錄，數據不太安全。
第二種：post請求方式請求數據
向服務器提交數據的一種請求，post請求則作爲http消息的實際內容發送給web服務器，數據放置在HTMLHeader內提交，post沒有限制提交數據，post比get更安全。
String path = "http://192.168.1.117:8080/web2/servlet/LoginServlet";
String data="name="+URLEncoder.encode(name)+"&pass="+pass;
HttpClient框架已經將handler對象封裝好了，所以比get和post方式更方便
第三種：HttpClient框架請求數據
HttpClient框架把請求的方法封裝成了一個框架
與get和post請求類似：只是使用的對象不同，HttpClient直接把get請求和post請求的方法進行了封裝
HttpClient hc = new DefaultHttpClient();
HttpGet hg = new HttpGet(path);//get請求
HttpPost hp=new HttpPost(path);//post請求
第四種：異步HttpClient框架請求數據
異步HttpClient框架比HttpClient框架更簡單，他是藉助第三方工具jar包裏封裝好的對象和方法實現請求數據的
AsyncHttpClient ahc = new AsyncHttpClient();
ahc.get(url, new MyResponseHandler());
二，需要注意的事項
1，無論哪種請求方式都需要添加網絡權限
2，路徑的格式必須與服務器提供的完全保持一致，否則不能連接
3，如果字段名字寫錯會出現登陸失敗的情況
4，不要忘記把路徑傳參添加到請求方法中。否則請求不了
5，只要出現一點問題，都不會請求成功，所以一定要細心
6，get請求和post請求的方法get和post必須大寫

下面可以具體看一下源碼：
1，get請求方式請求數據：
public class MainActivity extends Activity {
Handler handler=new Handler(){
   public void handleMessage(Message msg) {
       Toast.makeText(getApplicationContext(), (CharSequence) msg.obj, 0).show();
   };
};
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
   }

public void click(View v){
   EditText et_name=(EditText) findViewById(R.id.et_name);
   EditText et_pass=(EditText) findViewById(R.id.et_pass);
   final String name=et_name.getText().toString().trim();
   final String pass=et_pass.getText().toString().trim();
   new Thread(){
       public void run() {
           String path="http://192.168.1.117:8080/web2/servlet/LoginServlet?name="+URLEncoder.encode(name)+"&pass="+pass;
       try {
           URL url = new URL(path);
           HttpURLConnection conn = (HttpURLConnection) url.openConnection();
           conn.setRequestMethod("GET");
           conn.setReadTimeout(3000);
           conn.setConnectTimeout(3000);
           conn.connect();
           if(conn.getResponseCode()==200){
               InputStream is = conn.getInputStream();
               BufferedReader in = new BufferedReader(new InputStreamReader(is,"GBK"));
               StringBuffer buffer = new StringBuffer();
               String line="";
               while((line=in.readLine())!=null){
                   buffer.append(line);
               }
               String text=buffer.toString();
               Message msg = new Message();
               msg.obj=text;
               handler.sendMessage(msg);
           }
       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
       };
   }.start();
}

}
2，post請求方式請求數據
public class MainActivity extends Activity {
Handler handler=new Handler(){
   public void handleMessage(Message msg) {
       Toast.makeText(MainActivity.this, (String) msg.obj, 0).show();
   };
};
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
   }
public void click(View v){
   EditText et_name=(EditText) findViewById(R.id.et_name);
   EditText et_pass=(EditText) findViewById(R.id.et_pass);
   final String name=et_name.getText().toString().trim();
   final String pass=et_pass.getText().toString().trim();

   new Thread(){
       public void run() {
           String path = "http://192.168.1.117:8080/web2/servlet/LoginServlet";
           try {
               URL url = new URL(path);
               HttpURLConnection conn = (HttpURLConnection) url.openConnection();
               conn.setRequestMethod("POST");
               conn.setReadTimeout(3000);
               conn.setConnectTimeout(3000);
               String data="name="+URLEncoder.encode(name)+"&pass="+pass;
               conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
               conn.setRequestProperty("Content-Length", data.length()+"");
               conn.setDoOutput(true);
               OutputStream os = conn.getOutputStream();
               os.write(data.getBytes());
               conn.connect();
               if(conn.getResponseCode()==200){
                   InputStream is = conn.getInputStream();
                   BufferedReader in = new BufferedReader(new InputStreamReader(is,"GBK"));
                   StringBuffer buffer = new StringBuffer();
                   String line="";
                   while((line=in.readLine())!=null){
                       buffer.append(line);

                   }
                   String text=buffer.toString();
                   Message msg = handler.obtainMessage();
                   msg.obj=text;
                   handler.sendMessage(msg);
               }


           } catch (Exception e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       };
   }.start();
}
}
3，HttpClient框架請求數據
public class MainActivity extends Activity {
Handler handler=new Handler(){
   public void handleMessage(Message msg) {
       Toast.makeText(getApplicationContext(), (CharSequence) msg.obj, 0).show();
   };
};
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

   }
HttpClient框架get請求方式
   public void get(View v){
       EditText et_name = (EditText) findViewById(R.id.et_name);
       EditText et_pass = (EditText) findViewById(R.id.et_pass);

       final String name = et_name.getText().toString();
       final String pass = et_pass.getText().toString();

       new Thread(){
           public void run() {
               String path= "http://192.168.1.117:8080/web2/servlet/LoginServlet?name=" + URLEncoder.encode(name) + "&pass=" + pass;
               HttpClient hc = new DefaultHttpClient();
               HttpGet hg = new HttpGet(path);
               try {
                   HttpResponse hr = hc.execute(hg);
                   StatusLine sl = hr.getStatusLine();
                   if(sl.getStatusCode() == 200){
                       HttpEntity he = hr.getEntity();
                       InputStream is = he.getContent();
                       BufferedReader in = new BufferedReader(new InputStreamReader(is,"GBK"));
                   StringBuffer buffer = new StringBuffer();
                   String line="";
                   while((line=in.readLine())!=null){
                       buffer.append(line);
                   }
                   String text=buffer.toString();
                   Message msg = new Message().obtain();
                   msg.obj=text;
                   handler.sendMessage(msg);
                   }
               } catch (Exception e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               }
           };
       }.start();
   }
HttpClient框架post請求方式
public void post(View v){
   EditText et_name = (EditText) findViewById(R.id.et_name);
   EditText et_pass = (EditText) findViewById(R.id.et_pass);
   final String name = et_name.getText().toString();
   final String pass = et_pass.getText().toString();
   new Thread(){
       public void run() {
           String path="http://192.168.1.117:8080/web2/servlet/LoginServlet";
           HttpClient hc=new DefaultHttpClient();
           //不要忘了把path傳入
           HttpPost hp=new HttpPost(path);
           BasicNameValuePair bnvp1=new BasicNameValuePair("name",name);
           BasicNameValuePair bnvp2=new BasicNameValuePair("pass",pass);
           List<BasicNameValuePair> parameters=new ArrayList<BasicNameValuePair>();
           parameters.add(bnvp1);
           parameters.add(bnvp2);
           try {
               UrlEncodedFormEntity entity=new UrlEncodedFormEntity(parameters,"utf-8");
               hp.setEntity(entity);
               HttpResponse hr = hc.execute(hp);
               if(hr.getStatusLine().getStatusCode()==200){
                   InputStream is = hr.getEntity().getContent();
                   BufferedReader in = new BufferedReader(new InputStreamReader(is,"GBK")) ;
                       StringBuffer buffer = new StringBuffer();
                       String line="";
                       while((line=in.readLine())!=null){
                           buffer.append(line);
                       }
                       String text=buffer.toString();
                       Message msg = handler.obtainMessage();
                       msg.obj=text;
                       handler.sendMessage(msg);

               }
           } catch (Exception e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       };
   }.start();
}

}
4，異步HttpClient框架請求數據
先導入第三方工具包至src文件夾中
public class MainActivity extends Activity {

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
   }

   public void get(View v){
       EditText et_name = (EditText) findViewById(R.id.et_name);
       EditText et_pass = (EditText) findViewById(R.id.et_pass);

       final String name = et_name.getText().toString();
       final String pass = et_pass.getText().toString();
       String url = "http://192.168.1.117:8080/web2/servlet/LoginServlet?name=" + URLEncoder.encode(name) + "&pass=" + pass;
       AsyncHttpClient ahc = new AsyncHttpClient();
       ahc.get(url, new MyResponseHandler());
}
   public void post(View v){
           EditText et_name = (EditText) findViewById(R.id.et_name);
           EditText et_pass = (EditText) findViewById(R.id.et_pass);

           final String name = et_name.getText().toString();
           final String pass = et_pass.getText().toString();
           String url = "http://192.168.1.117:8080/web2/servlet/LoginServlet";
           AsyncHttpClient ahc = new AsyncHttpClient();
           RequestParams params = new RequestParams();
           params.add("name", name);
           params.add("pass", pass);
           ahc.post(url, params, new MyResponseHandler());
        }

        class MyResponseHandler extends AsyncHttpResponseHandler{
           public void onSuccess(int statusCode, Header[] headers,
                   byte[] responseBody) {
               try {
                   Toast.makeText(MainActivity.this, new String(responseBody,"GBK"), 0).show();
               } catch (UnsupportedEncodingException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               }

           }
           public void onFailure(int statusCode, Header[] headers,
                   byte[] responseBody, Throwable error) {
               Toast.makeText(MainActivity.this, "請求失敗", 0).show();

           }

}
}

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