java - 在 java 套接字服务器中添加 HTTP header 到响应

Question

我不确定在哪里或使用什么命令将 HTTP header 添加到服务器的响应中。

import java.io.*;
import java.net.*;
import com.sun.net.httpserver.*;

public class Response {

private static final int BUFFER_SIZE = 9999;
Request request;
BufferedOutputStream output;
//constructor para el output
public Response(BufferedOutputStream output){
    this.output = output;
}
//Set del request
public void setRequest(Request request){
    this.request = request;
}

public void sendResource() throws IOException{

    File file = new File(Java_Server.Web_dir,request.getUri());
    byte [] bytearray = new byte[(int) file.length()];

    FileInputStream file_out = null;

    if(file.exists())
        file_out = new FileInputStream(file);  
    else{
        String errorMessage = "HTTP/1.1 404 File Not Found\r\n" +
      "Content-Type: text/html\r\n" +
      "Content-Length: 23\r\n" +
      "\r\n" +
      "<h1>File Not Found</h1>";
    output.write(errorMessage.getBytes());
    }

    BufferedInputStream bis = new BufferedInputStream(file_out);

    try{
        bis.read(bytearray,0,bytearray.length);
        output.write(bytearray,0 , bytearray.length);
        output.flush();
        output.close();
        return;
    }catch (IOException e){
        e.printStackTrace();
    }

}

内容被传送到浏览器，但没有 HTTP header ，例如，如果发送图像，浏览器不会显示图像，而是逐字节显示。

Answer 1

首选的方法是实现 Servlet 并在 Servlet 容器中运行它。然后调用 HttpServletResponse 对象上的 setHeader 方法:

public class ExampleServlet extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
        response.setHeader("X-Whatever-Header-Name-You-Want", "Value");
    }
}