使用java 实现web服务器，源代码，实现能访问html，css,jpg,jpeg

package com.test; import java.io.*; import java.net.*; import java.util.Date; public class Response { String sentences = null; File file = null; public Response(Socket socket,String method ,String rout) { this.createSentences(method, rout); } void createSentences(String method,String rout) { file = new File(rout); //如果文件不存在 if(!file.exists()) { File file = new File("NotFound.html"); this.sentences = "HTTP/1.0 404 Not Found\r\n"; this.sentences +="MIME_version: 1.0\r\n"; this.sentences +="Connection: close\r\n"; Date date = new Date(); this.sentences += "Date: " + date.toString() +"\r\n"; this.sentences += "Content_Length: " + file.length() +"\r\n"; this.sentences += "Content_Type: text/html\r\n\r\n"; } //文件存在 else { this.sentences ="HTTP/1.0 200 OK\r\n"; this.sentences +="MIME_version: 1.0\r\n"; this.sentences +="Connection: close\r\n"; Date date = new Date(); this.sentences += "Date: " + date.toString() +"\r\n"; this.sentences += "Content_Length: " + this.file.length() +"\r\n"; //判断文件类型 System.out.println("文件路径：" + rout); String extension = rout.substring(rout.lastIndexOf('.') + 1); System.out.println(extension); if(extension.compareToIgnoreCase("html") == 0 || extension.compareToIgnoreCase("htm") == 0) { this.sentences +="Content_Type: " + "text/html\r\n\r\n"; } else if(extension.compareToIgnoreCase("gif")== 0) { this.sentences +="Content_Type: " + "image/gif\r\n\r\n"; } else if(extension.compareToIgnoreCase("css")==0) { this.sentences +="Content_Type: " + " text/css\r\n\r\n"; } else if(extension.compareToIgnoreCase("jpg") == 0 || extension.compareToIgnoreCase("jpeg") == 0 || extension.compareToIgnoreCase("jpe")==0) { this.sentences += "Accept-Encoding: gzip,deflate,sdch\r\n"; this.sentences +="Content_Type: " + "image/jpeg\r\n"; this.sentences += "Server: FileServer 1.0\r\n\r\n"; } else { } } } String getSentences() { return this.sentences; } }