Question

我正在编写 HTTP WEB SERVER 代码。

直到现在我实施了 GET，HEAD 方法。现在我必须实现OPTIONS方法。但这次客户的shell没有收到任何回复。我不明白为什么会这样。请帮助我。我发布了我的代码，请帮助检测错误。

我的代码

客户端

public class Client {

    public static void main(String[] args) {
          HttpClient client = new HttpClient();
          client.getParams().setParameter("http.useragent", "Test Client");
          BufferedReader br = null;

          OptionsMethod method = new OptionsMethod("http://10.40.55.240:8080/");

          try {
            int returnCode = client.executeMethod(method);
            if(returnCode == 405 ) {
                System.out.println("The Options method is not implemented by this URI");                
            } else {
                System.out.println("REACH HERE");
                br = new BufferedReader(new InputStreamReader(/*What I put here to get socket InputStream*/);
                String readLine;
                while((readLine = br.readLine()) != null) {
                    System.out.println(readLine);
                }
            }
            //System.out.println(returnCode);
          } catch(Exception e) {
            e.printStackTrace();
          } finally {
                method.releaseConnection();
                if(br != null) {
                    try {
                        br.close();
                    }   
                    catch(Exception e) {}
                }
         }
    }
}

响应客户的服务器代码

           else if(methodName.equals("OPTIONS")) {
                System.out.println("GOING TO HANDLE OPTIONS REQUEST");

                printStream.print("HTTP/1.1 " + ServerSettings.HTTP_OK + " OK");
                printStream.write(EOL);
                printStream.print("Date: " + new Date());
                printStream.write(EOL);
                printStream.print("Allow: OPTIONS, GET, HEAD");
                printStream.write(EOL);
                printStream.print("Content-Length: 0");
                printStream.write(EOL);
            }

            inputStream.close();
    printStream.close();

请帮帮我，如何从服务器接收标题。

我应该在客户端的注释部分放置什么来接收标题。

br = new BufferedReader(new InputStreamReader(/*What I put here to get socket InputStream*/);

Answer 1

我得到了上述问题的答案，如下： -

由于Response Body没有Options Method。所以，这里服务器只响应Header，它可以在客户端shell上显示，使用以下语句： -

int returnCode = client.executeMethod(method);
if(returnCode == 405 ) {
        System.out.println("The Options method is not implemented by this URI");
} else {
        Header[] header = method.getResponseHeaders();
        for(int i = 0; i < header.length; i++) {
             System.out.println(header[i].getName() + ": " + header[i].getValue());
        }
}

如果对于其他方法，如果还有任何响应体，那么我们可以使用下面的代码，

try {
    int returnCode = client.executeMethod(method);
    if(returnCode == 405 ) {
        System.out.println("The XXX method is not implemented by this URI");
    } else {
        Header[] header = method.getResponseHeaders();
        for(int i = 0; i < header.length; i++) {
            System.out.println(header[i].getName() + ": " + header[i].getValue());
        }
        br = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream()));
        byte[] buf = new byte[1024];
        String readLine;
        while (((readLine = br.readLine()) != null)) {
            System.out.println(readLine);
        }
    }
  } catch(Exception e) {
        e.printStackTrace();
   } finally {
        System.out.println("close method");
        method.releaseConnection();
        try {
        br.close();
        } 
        catch(IOException ioe) {}
 }

为什么响应标头未显示在客户端的shell中？

1 个答案: