通過HTTP認證將憑據傳遞給服務器並獲得響應的完整指南

Question

因此，我們知道如何執行http獲取和發佈連接。 http://exampledepot.com/egs/java.net/pkg.html 我們希望將憑據（uname，passwd）傳遞給任何Web服務器以訪問url或獲取響應。 而且我們不能將它作爲後期參數傳遞。 所以看看@這個非常簡單的代碼就可以做到這一切。

Answer 1

try 
    { 
     // Creatin the connection 
     URL url = new URL("http://yoururl"); 
     URLConnection conn = url.openConnection(); 

    //sendin the base64 encoded credentials thru d header 
    conn.setRequestProperty(
     "Authorization", 
     "Basic "+ BasicAuth.encode(username, password)); 

    // Get the response 
    BufferedReader rd = new BufferedReader(
     new InputStreamReader(conn.getInputStream())); 

    //readin d response till d end 
    while ((line = rd.readLine()) != null) { 
     // Process line... 
     Log.v("", line); 
    } 

    rd.close(); 
} 
catch (Exception e) { } 

爲了對憑證進行編碼，我使用了一個名爲「BasicAuth.java」的簡單外部類，您可以將它添加到您的項目中。 BasicAuth.java

public class BasicAuth { 
private BasicAuth() {} 

    // conversion table 
    private static byte[] cvtTable = { 
     (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', 
     (byte)'F', (byte)'G', (byte)'H', (byte)'I', (byte)'J', 
     (byte)'K', (byte)'L', (byte)'M', (byte)'N', (byte)'O', 
     (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', 
     (byte)'U', (byte)'V', (byte)'W', (byte)'X', (byte)'Y', 
     (byte)'Z', 
     (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', 
     (byte)'f', (byte)'g', (byte)'h', (byte)'i', (byte)'j', 
     (byte)'k', (byte)'l', (byte)'m', (byte)'n', (byte)'o', 
     (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', 
     (byte)'u', (byte)'v', (byte)'w', (byte)'x', (byte)'y', 
     (byte)'z', 
     (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', 
     (byte)'5', (byte)'6', (byte)'7', (byte)'8', (byte)'9', 
     (byte)'+', (byte)'/' 
    }; 

    /** 
    * Encode a name/password pair appropriate to 
    * use in an HTTP header for Basic Authentication. 
    * name  the user's name 
    * passwd the user's password 
    * returns String the base64 encoded name:password 
    */ 
    static String encode(String name, 
         String passwd) { 
     byte input[] = (name + ":" + passwd).getBytes(); 
     byte[] output = new byte[((input.length/3) + 1) * 4]; 
     int ridx = 0; 
     int chunk = 0; 

     /** 
     * Loop through input with 3-byte stride. For 
     * each 'chunk' of 3-bytes, create a 24-bit 
     * value, then extract four 6-bit indices. 
     * Use these indices to extract the base-64 
     * encoding for this 6-bit 'character' 
     */ 
     for (int i = 0; i < input.length; i += 3) { 
      int left = input.length - i; 

      // have at least three bytes of data left 
      if (left > 2) { 
       chunk = (input[i] << 16)| 
         (input[i + 1] << 8) | 
         input[i + 2]; 
       output[ridx++] = cvtTable[(chunk&0xFC0000)>>18]; 
       output[ridx++] = cvtTable[(chunk&0x3F000) >>12]; 
       output[ridx++] = cvtTable[(chunk&0xFC0) >> 6]; 
       output[ridx++] = cvtTable[(chunk&0x3F)]; 
      } else if (left == 2) { 
       // down to 2 bytes. pad with 1 '=' 
       chunk = (input[i] << 16) | 
         (input[i + 1] << 8); 
       output[ridx++] = cvtTable[(chunk&0xFC0000)>>18]; 
       output[ridx++] = cvtTable[(chunk&0x3F000) >>12]; 
       output[ridx++] = cvtTable[(chunk&0xFC0) >> 6]; 
       output[ridx++] = '='; 
      } else { 
       // down to 1 byte. pad with 2 '=' 
       chunk = input[i] << 16; 
       output[ridx++] = cvtTable[(chunk&0xFC0000)>>18]; 
       output[ridx++] = cvtTable[(chunk&0x3F000) >>12]; 
       output[ridx++] = '='; 
       output[ridx++] = '='; 
      } 
     } 
     return new String(output); 
    } 

}