Java中的HttpRequest：總是進入404

我編寫了這個HttpRequest方法，但由於某些原因，它始終轉到404 Not Found，即使文件位置在java進程沒有運行時存在。Java中的HttpRequest：總是進入404

import java.io.*; 
import java.net.*; 
import java.util.*; 

final class HttpRequest implements Runnable { 
    final static String CRLF = "\r\n"; 
    Socket socket; 

    // Constructor 
    public HttpRequest(Socket socket) throws Exception { 
     this.socket = socket; 
    } 

    // Implement the run() method of the Runnable interface. 
    public void run() { 
     try { 
      processRequest(); 
     } catch (Exception e) { 
      System.out.println(e); 
     } 
    } 

    private static void sendBytes(FileInputStream fis, OutputStream os) 
    throws Exception { 
    // Construct a 1K buffer to hold bytes on their way to the socket. 
    byte[] buffer = new byte[1024]; 
    int bytes = 0; 

    // Copy requested file into the socket's output stream. 
    while((bytes = fis.read(buffer)) != -1) { 
     os.write(buffer, 0, bytes); 
     } 
    } 

    private static String contentType(String fileName) { 
    if(fileName.endsWith(".htm") || fileName.endsWith(".html")) { 
     return "text/html"; 
    } 
    if(fileName.endsWith(".jpeg") || fileName.endsWith(".jpg")) { 
    return "image/jpeg"; 
    } 
    if(fileName.endsWith(".gif")) { 
    return "image/gif"; 
    } 
    return "application/octet-stream"; 
    } 

    private void processRequest() throws Exception { 
     // Get a reference to the socket's input and output streams. 
     InputStream is = socket.getInputStream(); 
     DataOutputStream os = new DataOutputStream(socket.getOutputStream()); 

     // Set up input stream filters. 
     BufferedReader br = new BufferedReader(new InputStreamReader(is)); 

     // Get the request line of the HTTP request message. 
     String requestLine = new String(br.readLine()); 

     // Display the request line. 
     System.out.println(); 
     System.out.println(requestLine); 

     // Get and display the header lines. 
     String headerLine = null; 
     while ((headerLine = br.readLine()).length() != 0) { 
      System.out.println(headerLine); 
     } 

    // Extract the filename from the request line. 
    StringTokenizer tokens = new StringTokenizer(requestLine); 
    tokens.nextToken(); // skip over the method, which should be "GET" 
    String fileName = tokens.nextToken(); 
    // Prepend a "." so that file request is within the current directory. 
    fileName = "." + fileName; 

    // Open the requested file. 
    FileInputStream fis = null; 
    boolean fileExists = true; 
    try { 
    fis = new FileInputStream(fileName); 
    } catch (FileNotFoundException e) { 
    fileExists = false; 
    } 

    // Construct the response message. 
    String statusLine = null; 
    String contentTypeLine = null; 
    String entityBody = null; 
    if (fileExists) { 
    statusLine = "200 OK" + CRLF; 
    contentTypeLine = "Content-type: " + 
     contentType(fileName) + CRLF; 
    } else { 
    statusLine = "404 NOT FOUND" + CRLF; 
    contentTypeLine = "Content Not Found!" + CRLF; 
    entityBody = "<HTML>" + 
     "<HEAD><TITLE>Not Found</TITLE></HEAD>" + 
     "<BODY>Not Found</BODY></HTML>"; 
    } 

    // Send the status line. 
    os.writeBytes(statusLine); 

    // Send the content type line. 
    os.writeBytes(contentTypeLine); 

    // Send a blank line to indicate the end of the header lines. 
    os.writeBytes(CRLF); 

    // Send the entity body. 
    if (fileExists) { 
    sendBytes(fis, os); 
    fis.close(); 
    } else { 
    os.writeBytes("File DNE: Content Not Found!"); 
    } 

     // Close streams and socket. 
     os.close(); 
     br.close(); 
     socket.close(); 
    } 
}

任何幫助將不勝感激......我覺得這是一些簡單的我失蹤。

來源

2012-02-20 user1034868

我跑你的代碼;它工作正常（除了一些小問題沒有正確打印標題，我試過的每個瀏覽器都願意完全忽略）。

你確定你的工作目錄是你期望的嗎？嘗試改變404消息是這樣的：

contentTypeLine = "Content Not Found: " + new File(fileName).getAbsolutePath() + CRLF;

僅供參考，我的一個測試工具運行它：

public static void main(String[] args) throws Exception { 
     final ServerSocket ss = new ServerSocket(8080); 
     while (true) 
      new HttpRequest(ss.accept()).run(); 
    }

來源

2012-02-20 01:30:37 FauxFaux

我不知道我是正確的測試它...你能指導我如何測試它？我非常肯定，當我不斷收到404的時候，我做錯了。 – user1034868 2012-02-20 02:44:34

Java中的HttpRequest：總是進入404

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