package com.socket.httpservertest; import java.io.File; import java.io.IOException; 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"; // shutdown command private static final String SHUTDOWN_COMMAND = "/SHUTDOWN"; // the shutdown command received private boolean shutdown = false; public static void main(String[] args) { HttpServer server = new HttpServer(); server.await(); } public void await() { // System.out.println(System.getProperty("user.dir")); ServerSocket serverSocket = null; int port = 8080; try { serverSocket = new ServerSocket(port, 1, InetAddress.getByName("127.0.0.1")); } catch (IOException e) { e.printStackTrace(); System.exit(1); } while (!shutdown) { Socket socket = null; InputStream input = null; OutputStream output = null; try { //接收了客户端发来的请求,否则一致是等待状态 socket = serverSocket.accept(); input = socket.getInputStream(); output = socket.getOutputStream(); // create Request object and parse Request request = new Request(input); request.parse(); //从请求中读取内容 // create Response object Response response = new Response(output); response.setRequest(request); response.sendStaticResource(); // Close the socket socket.close(); //check if the previous URI is a shutdown command shutdown = request.getUri().equals(SHUTDOWN_COMMAND); }catch (Exception e) { e.printStackTrace (); continue; } } } }
package com.socket.httpservertest; import java.io.IOException; import java.io.InputStream; public class Request { private InputStream input; private String uri; public Request(InputStream input) { this.input = input; } public void parse() { // Read a set of characters from the socket StringBuffer request = new StringBuffer(2048); int i; byte[] buffer = new byte[2048]; try { i = input.read(buffer); //将从输入流取2048长度的内容存到buffer字节数组中,如果内容不到2048,数组其他空间剩余空着 } 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()); } private String parseUri(String requestString) { int index1, index2; index1 = requestString.indexOf(' '); /* * http请求行的结构:方法 统一资源标识符(URI) 协议/版本(它们之间以空格分隔) * 例如:POST //examples/default.jsp HTTP/1.1 */ if (index1 != -1) {// index1 == -1表示没找到 index2 = requestString.indexOf(' ', index1 + 1);//从index+1位置开始寻找‘ ’ if (index2 > index1) return requestString.substring(index1 + 1, index2); } return null; } public String getUri() { return uri; } }
package com.socket.httpservertest; 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) { 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) { //ch==-1表示读到末尾了 output.write(bytes, 0, ch); //写出到浏览器 ch = fis.read(bytes, 0, BUFFER_SIZE);//再读会接上一次读的位置往下读,如果读到末尾就会返回-1,终止输出 } } else { // file not found 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) { // thrown if cannot instantiate a File object System.out.println(e.toString() ); } finally { if (fis!=null) fis.close(); } } }
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