Tomcat学习笔记（一）一个简单的Web服务器
2021-07-02 00:06
标签：name 统一 组成 常用 ann 字节 套接字 对象 shu Tomcat学习笔记（一）一个简单的Web服务器 标签：name 统一 组成 常用 ann 字节 套接字 对象 shu 原文地址：http://www.cnblogs.com/bjh1117/p/7131459.htmlpackage 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 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" + "
File Not Found
";
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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