一个简单的Web服务器
程序员文章站
2022-03-02 22:49:56
...
HttpServer, Request, Response
package com.iteye.wely.server;
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;
/**
* Created by shenhongxi on 16/3/21.
*/
public class HttpServer {
public static final String WEB_ROOT = System.getProperty("user.dir") + File.separator + "ixhong-tomcat-web/src/main/webapp";
private static final String SHUTDOWN_COMMAND = "SHUTDOWN";
private boolean shutdown = false;
public static void main(String[] args) {
HttpServer server = new HttpServer();
System.out.println(WEB_ROOT);
server.await();
}
private void await() {
ServerSocket serverSocket = null;
int port = 8080;
try {
serverSocket = new ServerSocket(port, 1, InetAddress.getByName("127.0.0.1"));
System.out.println("Server started!");
} catch (IOException 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.iteye.wely.server;
import java.io.IOException;
import java.io.InputStream;
/**
* Created by shenhongxi on 16/3/21.
*/
public class Request {
private InputStream input;
private String uri; // 性能考虑,用byte[]
public Request(InputStream input) {
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.println(request.toString());
uri = parseUri(request.toString());
}
private String parseUri(String requestStr) {
// GET /index.html HTTP/1.1
// Accept: text/plain; text/html
// ...
int index1 = requestStr.indexOf(' ');
int index2;
if (index1 != -1) {
index2 = requestStr.indexOf(' ', index1 + 1);
if (index2 > index1) {
return requestStr.substring(index1 + 1, index2);
}
}
return null;
}
public String getUri() {
return uri;
}
}
package com.iteye.wely.server;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* Created by shenhongxi on 16/3/21.
*/
public class Response {
private static final int BUFFER_SIZE = 1024;
Request request;
OutputStream output;
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 errorMsg = "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(errorMsg.getBytes());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (fis != null) {
fis.close();
}
}
}
public Response(OutputStream output) {
this.output = output;
}
public void setRequest(Request request) {
this.request = request;
}
}