看看这个小程序哪出问题了(网络编程)

优质创作者: Java技术领域

领域专家: 后端开发技术领域

2014-12-25 04:36:50



import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.*;

public class WebServer {



	protected void start() {

		ServerSocket s;

		System.out.println("WebServer starting up on port 80:");

		System.out.println("press ctrl-c to exit");

		try {

			s=new ServerSocket(80);

		} catch (IOException e) {

			// TODO Auto-generated catch block

			System.out.println("Error:"+e);

			return;//终止程序

		}

		//---------------------------------------------------

		System.out.println("Waiting for connection......");

		for(;;){

			try {

				Socket remote=s.accept();//阻塞

				System.out.println("Connected,sending data");

				

				BufferedReader br=new BufferedReader(new InputStreamReader(remote.getInputStream()));

				PrintWriter out=new PrintWriter(remote.getOutputStream());

				

				String res="客户端发来的信息：";

				System.out.println(res);

				while(!res.equals("")){//只要没有读到空行就继续

					res=br.readLine();

					System.out.println(res);

				}

				

				//向客户端(浏览器)发送信息

				out.println("HTTP/1.0 200 OK");

				out.println("Content-type:text/html");

				out.println("Server:Bot");

				out.println("<h1>浏览器，你好！</h1>");

				out.flush();//防止缓冲区还有内容没有送出

				System.out.println("响应完毕！");

				remote.close();

				

			} catch (IOException e) {

				// TODO Auto-generated catch block

				System.out.println("Error:"+e);

			}

		}

	}

	

	public static void main(String[] args) {

		new WebServer().start();

	}

	

}

为什么控制台输出两遍信息
并且浏览器没显示服务器发来的信息？

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skgary 2014-12-31

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1024以下的端口少用。 3楼贴出来的第17行就是这个请求。最后说一句，做这种应用，多看看相关的协议。

程猿薇茑 2014-12-26

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有谁知道如何打开win8的7号端口？


package test;
/*
 * 使用socket的getOutputStream和getInputStream实现一个简单的echo客户端
 * 用户在控制台键入的数据被返回发送给服务器
 */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class EchoClient {
	public static void main(String[] args) {
		String hostname = "localhost";
		BufferedReader networkIn = null;
		PrintWriter out = null;
		
		try {
			Socket s=new Socket(hostname,7);
			//分别获取此socket连接的OutputStream和InputStream
			networkIn=new BufferedReader(new InputStreamReader(s.getInputStream()));
			BufferedReader userIn=new BufferedReader(new InputStreamReader(System.in));
			out=new PrintWriter(s.getOutputStream());
			System.out.println("Connected to echo server,please enter data");
		
			while(true){
				String theLine=userIn.readLine();
				if(theLine.equals("exit")){
					break;
				}
				out.println(theLine);//把用户在控制台输入的数据写入socket的流中
				out.flush();//网络缓冲的数据写入流中
				System.out.println(networkIn.readLine());//从socket的流中读取数据并向控制台输出
			}
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
				try {
					if(networkIn!=null)
						networkIn.close();
					if(out!=null)out.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
		}
	}
}

此程序链接到本地7号端口没成功，我是win8

shixitong 2014-12-26

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//把这几个去掉，浏览器就能展示了
//out.println("HTTP/1.0 200 OK");
//out.println("Content-type:text/html");
//out.println("Server:Bot");

out.println("<h1>浏览器，你好！</h1>");
out.flush();//防止缓冲区还有内容没有送出
System.out.println("响应完毕！");

不过有点奇怪的是，我用IE测试是响应两遍（发了两遍请求）就象1楼说的但是我用火狐测试显示3遍具体内容如下

WebServer starting up on port 80:
press ctrl-c to exit
Waiting for connection......
Connected,sending data
客户端发来的信息：
GET / HTTP/1.1
Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/xaml+xml, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-xpsdocument, */*
Accept-Language: zh-cn
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; InfoPath.2; .NET CLR 2.0.50727; .NET4.0C; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; Shuame)
Accept-Encoding: gzip, deflate
Host: localhost
Connection: Keep-Alive

响应完毕！
Connected,sending data
客户端发来的信息：
GET /favicon.ico HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; InfoPath.2; .NET CLR 2.0.50727; .NET4.0C; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; Shuame)
Host: localhost
Connection: Keep-Alive

响应完毕！
Connected,sending data
客户端发来的信息：
GET / HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:34.0) Gecko/20100101 Firefox/34.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: keep-alive

响应完毕！

skgary 2014-12-26