volley post請求 gzip壓縮 json 傳輸

這裏以post請求說明，get請求相似設置請求頭及超時。

1.自定義request，繼承com.android.volley.Request

2.構造方法實現（basecallback,爲自定義的監聽，實現Response.Listener,ErrorListener接口）--post請求

String  params;
 public  static    int SOCKET_TIMEOUT=20000;
public  MyRequest(String url,String params, Response.Listener<String> listener, Response.ErrorListener errorListener){
     super(Method.POST,url,listener,errorListener);
    this.params=params;
}

1. </pre>

3.請求頭設置：重寫getHeaders方法

1. @Override  
      public Map<String, String> getHeaders() throws AuthFailureError  
      {  
   Map<String, String> headers = new HashMap<String, String>();  
   headers.put("Charset", "UTF-8");  
   headers.put("Content-Type", "application/x-javascript");  
   headers.put("Accept-Encoding", "gzip,deflate");  
   return headers;  
      }

設置字符集爲UTF-8,並採用gzip壓縮傳輸

4.超時設置：重寫getRetryPolicy方法

1. @Override  
      public RetryPolicy getRetryPolicy()  
      {  
   RetryPolicy retryPolicy = new DefaultRetryPolicy(SOCKET_TIMEOUT, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);  
   return retryPolicy;  
      }

5.請求參數組裝：重寫getBody方法

1. @Override  
      public byte[] getBody() throws AuthFailureError  
      {  
   return params == null ? super.getBody() : params.getBytes();  
      }

2. 6. 接收到gzip的數據 處理

3. @Override
   protected Response<String> parseNetworkResponse(NetworkResponse response) {
       String parsed =getRealString(response.data);
       return Response.success(parsed, HttpHeaderParser.parseCacheHeaders(response));
   }<pre name="code" class="java">private int getShort(byte[] data)
   {
       return (int) ((data[0] << 8) | data[1] & 0xFF);
   }
   
   public String getRealString(byte[] data)
   {
       byte[] h = new byte[2];
       h[0] = (data)[0];
       h[1] = (data)[1];
       int head = getShort(h);
       boolean t = head == 0x1f8b;
       InputStream in;
       StringBuilder sb = new StringBuilder();
       try
       {
           ByteArrayInputStream bis = new ByteArrayInputStream(data);
           if (t)
           {
               in = new GZIPInputStream(bis);
           }
           else
           {
               in = bis;
           }
           BufferedReader r = new BufferedReader(new InputStreamReader(in), 1000);
           for (String line = r.readLine(); line != null; line = r.readLine())
           {
               sb.append(line);
           }
           in.close();
       }
       catch (Exception e)
       {
           e.printStackTrace();
       }
       return sb.toString();
   }