import java.io.*; import java.net.*; /** * MyHttpServer 实现一个简单的HTTP服务器端,可以获取用户提交的内容 * 并给用户一个response * 因为时间的关系,对http头的处理显得不规范 * **/ public class MyHttpServer { //服务器根目录,post.html, upload.html都放在该位置 public static String WEB_ROOT = "c:/root"; //端口 private int port; //用户请求的文件的url private String requestPath; //mltipart/form-data方式提交post的分隔符, private String boundary = null; //post提交请求的正文的长度 private int contentLength = 0; public MyHttpServer(String root, int port) { WEB_ROOT = root; this.port = port; requestPath = null; } //处理GET请求 private void doGet(DataInputStream reader, OutputStream out) throws Exception { if (new File(WEB_ROOT + this.requestPath).exists()) { //从服务器根目录下找到用户请求的文件并发送回浏览器 InputStream fileIn = new FileInputStream(WEB_ROOT + this.requestPath); byte[] buf = new byte[fileIn.available()]; fileIn.read(buf); out.write(buf); out.close(); fileIn.close(); reader.close(); System.out.println("request complete."); } } //处理post请求 private void doPost(DataInputStream reader, OutputStream out) throws Exception { String line = reader.readLine(); while (line != null) { System.out.println(line); line = reader.readLine(); if ("".equals(line)) { break; } else if (line.indexOf("Content-Length") != -1) { this.contentLength = Integer.parseInt(line.substring(line.indexOf("Content-Length") + 16)); } //表明要上传附件, 跳转到doMultiPart方法。 else if(line.indexOf("multipart/form-data")!= -1){ //得multiltipart的分隔符 this.boundary = line.substring(line.indexOf("boundary") + 9); this.doMultiPart(reader, out); return; } } //继续读取普通post(没有附件)提交的数据 System.out.println("begin reading posted data......"); String dataLine = null; //用户发送的post数据正文 byte[] buf = {}; int size = 0; if (this.contentLength != 0) { buf = new byte[this.contentLength]; while(size<this.contentLength){ int c = reader.read(); buf[size++] = (byte)c; } System.out.println("The data user posted: " + new String(buf, 0, size)); } //发送回浏览器的内容 String response = ""; response += "HTTP/1.1 200 OK/n"; response += "Server: Sunpache 1.0/n"; response += "Content-Type: text/html/n"; response += "Last-Modified: Mon, 11 Jan 1998 13:23:42 GMT/n"; response += "Accept-ranges: bytes"; response += "/n"; String body = "<html><head><title>test server</title></head><body><p>post ok:</p>" + new String(buf, 0, size) + "</body></html>"; System.out.println(body); out.write(response.getBytes()); out.write(body.getBytes()); out.flush(); reader.close(); out.close(); System.out.println("request complete."); } //处理附件 private void doMultiPart(DataInputStream reader, OutputStream out) throws Exception { System.out.println("doMultiPart ......"); String line = reader.readLine(); while (line != null) { System.out.println(line); line = reader.readLine(); if ("".equals(line)) { break; } else if (line.indexOf("Content-Length") != -1) { this.contentLength = Integer.parseInt(line.substring(line.indexOf("Content-Length") + 16)); System.out.println("contentLength: " + this.contentLength); } else if (line.indexOf("boundary") != -1) { //获取multipart分隔符 this.boundary = line.substring(line.indexOf("boundary") + 9); } } System.out.println("begin get data......"); /*下面的注释是一个浏览器发送带附件的请求的全文,所有中文都是说明性的文字***** <HTTP头部内容略> ............ Cache-Control: no-cache <这里有一个空行,表明接下来的内容都是要提交的正文> -----------------------------7d925134501f6<这是multipart分隔符> Content-Disposition: form-data; name="myfile"; filename="mywork.doc" Content-Type: text/plain <附件正文>........................................ ................................................. -----------------------------7d925134501f6<这是multipart分隔符> Content-Disposition: form-data; name="myname"<其他字段或附件> <这里有一个空行> <其他字段或附件的内容> -----------------------------7d925134501f6--<这是multipart分隔符,最后一个分隔符多两个-> ****************************************************************/ /** * 上面的注释是一个带附件的multipart类型的POST的全文模型, * 要把附件去出来,就是要找到附件正文的起始位置和结束位置 * **/ if (this.contentLength != 0) { //把所有的提交的正文,包括附件和其他字段都先读到buf. byte[] buf = new byte[this.contentLength]; int totalRead = 0; int size = 0; while (totalRead < this.contentLength) { size = reader.read(buf, totalRead, this.contentLength - totalRead); totalRead += size; } //用buf构造一个字符串,可以用字符串方便的计算出附件所在的位置 String dataString = new String(buf, 0, totalRead); System.out.println("the data user posted:/n" + dataString); int pos = dataString.indexOf(boundary); //以下略过4行就是第一个附件的位置 pos = dataString.indexOf("/n", pos) + 1; pos = dataString.indexOf("/n", pos) + 1; pos = dataString.indexOf("/n", pos) + 1; pos = dataString.indexOf("/n", pos) + 1; //附件开始位置 int start = dataString.substring(0, pos).getBytes().length; pos = dataString.indexOf(boundary, pos) - 4; //附件结束位置 int end = dataString.substring(0, pos).getBytes().length; //以下找出filename int fileNameBegin = dataString.indexOf("filename") + 10; int fileNameEnd = dataString.indexOf("/n", fileNameBegin); String fileName = dataString.substring(fileNameBegin, fileNameEnd); /** * 有时候上传的文件显示完整的文件名路径,比如c:/my file/somedir/project.doc * 但有时候只显示文件的名字,比如myphoto.jpg. * 所以需要做一个判断。 */ if(fileName.lastIndexOf("//")!=-1){ fileName = fileName.substring(fileName.lastIndexOf("//") + 1); } fileName = fileName.substring(0, fileName.length()-2); OutputStream fileOut = new FileOutputStream("c://" + fileName); fileOut.write(buf, start, end-start); fileOut.close(); fileOut.close(); } String response = ""; response += "HTTP/1.1 200 OK/n"; response += "Server: Sunpache 1.0/n"; response += "Content-Type: text/html/n"; response += "Last-Modified: Mon, 11 Jan 1998 13:23:42 GMT/n"; response += "Accept-ranges: bytes"; response += "/n"; out.write("<html><head><title>test server</title></head><body><p>Post is ok</p></body></html>".getBytes()); out.flush(); reader.close(); System.out.println("request complete."); } public void service() throws Exception { ServerSocket serverSocket = new ServerSocket(this.port); System.out.println("server is ok."); //开启serverSocket等待用户请求到来,然后根据请求的类别作处理 //在这里我只针对GET和POST作了处理 //其中POST具有解析单个附件的能力 while (true) { Socket socket = serverSocket.accept(); System.out.println(socket.getInetAddress()); System.out.println("new request coming."); DataInputStream reader = new DataInputStream((socket.getInputStream())); String line = reader.readLine(); String method = line.substring(0, 4).trim(); OutputStream out = socket.getOutputStream(); this.requestPath = line.split(" ")[1]; System.out.println(method); if ("GET".equalsIgnoreCase(method)) { System.out.println("do get......"); this.doGet(reader, out); } else if ("POST".equalsIgnoreCase(method)) { System.out.println("do post......"); this.doPost(reader, out); } socket.close(); System.out.println("socket closed."); } } public static void main(String args[]) throws Exception { MyHttpServer server = new MyHttpServer("c:/root", 8080); server.service(); } }
时间: 2024-11-07 16:28:04