(原)仿Http服务器下载响应

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;


public class HttpEngine {
	
	private ServerSocket serverSocket;
	
	public void start() throws IOException {
		serverSocket = new ServerSocket(8080, 3);
		
		while(true) {
			Socket socket = serverSocket.accept();
			parseRequest(socket);
			parseResponse(socket);
			socket.close();
		}
		
	}
	
	public void parseRequest(Socket socket) throws IOException {
		InputStream is = socket.getInputStream();
		byte[] b = new byte[is.available()];
		is.read(b);
		//is.close();
	}
	
	public void parseResponse(Socket socket) throws IOException {
		OutputStream os = socket.getOutputStream();
		
		File file = new File("D:\\document.pdf");
		StringBuilder httpHead = new StringBuilder();
		
		httpHead.append("HTTP/1.1 200 OK\r\n")
				.append("Server: Microsoft-IIS/5.0\r\n")
				.append("ContentType: application/x-download\r\n")
				.append("Content-Disposition: attachment;filename=" + file.getName()+ "\r\n")
				.append("Cache-control: private\r\n\r\n");
		
		os.write(httpHead.toString().getBytes());
		
		FileInputStream is = new FileInputStream(file);
		
		byte[] b = new byte[1024];
		
		while(is.read(b) != -1) {
			os.write(b);
		}
		
		os.flush();
		
		os.close();
	}
	
	public static void main(String args[]) throws Exception {
		new HttpEngine().start();
	}
}

 在浏览器地址栏中打http://localhost:8080就能得到下载文件了