java 仿浏览器读取web服务器数据

Question

1：写的程序读取不到文件，web服务器用的是tomcat，已经打开了，用浏览器也能正常访问到

        Socket s=new Socket("127.0.0.1",8080);
        PrintWriter pw=new PrintWriter(s.getOutputStream(),true);
        pw.println("GET /myweb/1.html HTTP/1.1");
        pw.print("Accept: */*");
        pw.println("Host: 127.0.0.1:8080");
        pw.println("Connection: close");
        pw.println();

        InputStream ins=s.getInputStream();
        byte[] buf=new byte[1024];
        int len=ins.read(buf);
        String str=new String(buf,0,len);
        System.out.println(str);

        s.close();

运行结果：

HTTP/1.1 400 Bad Request
Server: Apache-Coyote/1.1
Transfer-Encoding: chunked
Date: Wed, 10 Apr 2019 14:11:40 GMT
Connection: close

0

Answer 1

要看一下Html 请求头和响应头的格式

请求头需要两个换行
后面的每一行需要一个换行

package net.linxingyang.test;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class TestHttp {

    public static void main(String[] args) throws UnknownHostException, IOException {


        Socket socket = new Socket();
        socket.connect(new InetSocketAddress(InetAddress.getByName("www.baidu.com"), 80));

        OutputStream os = socket.getOutputStream();
        os.write("GET / HTTP/1.1\n\n".getBytes());
        // os.write("other header \n".getBytes());

        InputStream is = socket.getInputStream();
        int length = -1;
        byte[] bytes = new byte[1024];
        while (-1 != (length = is.read(bytes))) {
            if (0 != length) {
                System.out.print(new String(bytes, 0, length));
            }
        }
    }

}