简易HTTP服务器搭建-优快云博客

注意在开发前应该在所在的项目下的webroot目录下放入index.html文件

//主类

package com.jack.test;

import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class HttpServer {
   public static final String WEB_ROOT = System.getProperty("user.dir") + File.separator + "webroot";
   private static final String SHUTDOWN_COMMAND = "/SHUTDOWN";
   private boolean shutdown = false;

   public static void main(String[] args) {
       HttpServer server = new HttpServer();
       server.await();
   }

   public void await() {
       ServerSocket serverSocket = null;
       int port = 8080;
       try {
           serverSocket = new ServerSocket(port, 1, InetAddress.getByName("127.0.0.1"));
       } catch (Exception e) {
           e.printStackTrace();
           System.exit(1);
       }
       while (!shutdown) {
           Socket socket= null;
           InputStream input=null;
           OutputStream output =null;
           try {
               socket=serverSocket.accept();
               input=socket.getInputStream();
               output=socket.getOutputStream();
               Request request = new Request(input);
               request.parse();
               Response response = new Response(output);
               response.setRequest(request);
               response.sendStaticResource();
               socket.close();
               shutdown =request.getUri().equals(SHUTDOWN_COMMAND);
           } catch (Exception e) {
               e.printStackTrace();
               continue;
           }
       }
   }


}

package com.jack.test;

import java.io.IOException;
import java.io.InputStream;

public class Request {
   private InputStream input;
   private String uri;
   public Request(InputStream input) {
       super();
       this.input = input;
   }
   public void parse(){
   StringBuffer request = new StringBuffer(2048);
   int i;
   byte[] buffer = new byte[2048];

   try {
   i = input.read(buffer);
   }
   catch (IOException e) {
   e.printStackTrace();
   i = -1;
   }
   for (int j=0; j<i; j++) {
   request.append((char) buffer[j]);
   }

   System.out.print(request.toString());
   uri = parseUri(request.toString());
   }
   public String parseUri(String requestString){
   int index1, index2;
   index1 = requestString.indexOf(' ');

   if (index1 != -1) {
   index2 = requestString.indexOf(' ', index1 + 1);
   if (index2 > index1)
   return requestString.substring(index1 + 1, index2);
   }
   return null;
   }
   public String getUri() {
       return uri;
   }

}

package com.jack.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;

public class Response {
   private static final int BUFFER_SIZE=1024;
   Request request;
   OutputStream output;

   public Response(OutputStream output) {
       super();
       this.output = output;
   }

   public void setRequest(Request request) {
   this.request = request;
   }

   public void sendStaticResource() throws IOException {
   byte[] bytes = new byte[BUFFER_SIZE];
   FileInputStream fis = null;

   try {
   File file = new File(HttpServer.WEB_ROOT, request.getUri());
   if (file.exists()) {
   fis = new FileInputStream(file);
   int ch = fis.read(bytes, 0, BUFFER_SIZE);

   while (ch != -1) {
   output.write(bytes, 0, ch);
   ch = fis.read(bytes, 0, BUFFER_SIZE);
   }
   }
   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());
   }
   }
   catch (Exception e) {
   System.out.println(e.toString() );
   }
   finally {
   if (fis != null)
   fis.close();
   }
   }
}
运行HttpServer后，在开发工具中输入网址http://localhost:8080/index.html

成功后结构类似如下：

GET /index.html HTTP/1.1
Accept: application/x-ms-application, image/jpeg, application/xaml+xml, image/gif, image/pjpeg, application/x-ms-xbap, */*
Accept-Language: zh-CN
Cache-Control: no-cache
UA-CPU: AMD64
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; Trident/7.0; rv:11.0) like Gecko
Host: localhost:8080
Connection: Keep-Alive

GET /index.html HTTP/1.1
Accept: application/x-ms-application, image/jpeg, application/xaml+xml, image/gif, image/pjpeg, application/x-ms-xbap, */*
Accept-Language: zh-CN
UA-CPU: AMD64
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; Trident/7.0; rv:11.0) like Gecko
Host: localhost:8080
Connection: Keep-Alive