最近用java简单实现了http服务器。主要是使用socket在端口监听浏览器的http请求，根据请求信息在服务器端进行路由（读取html页面），然后封装成http格式的响应返回到浏览器。代码如下:
项目大概这样。
HttpServer：
package server;
import java.io.*;
import java.net.*;
import router.SocketHandler;
/**
* http服务器启动类
* @author Administrator
*
*/
public class HttpServer {
static ServerSocket server = null ;
static Socket socket ;
static int PORT = 8888 ;
static String IP = "127.0.0.1";
public static void waiting(){
try {
server = new ServerSocket(PORT , 1, InetAddress.getByName(IP));
System.out.println("server waiting on " + PORT + " .....");
while(true){
socket = server.accept();
SocketHandler.handle(socket);
}
}catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
waiting();
}
}
socketHandler类:处理链接的socket。
package router;
import java.io.*;
import java.net.*;
/**
* 解析socket
* @author Administrator
*
*/
public class SocketHandler {
static Socket socket ;
static BufferedReader reader = null;
static PrintWriter out = null ;
static String requestUri = null ;
public static void handle(Socket socket){
SocketHandler.socket = socket ;
resoveRequest();
sendResponse();
close();
}
static void close(){
if( out != null)
out.close();
try {
if( reader != null)
reader.close();
if( socket != null)
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 解析request
*/
public static void resoveRequest(){
try {
reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String item = reader.readLine() ;
if( item != null ){
requestUri = item.split(" ")[1];
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 返回response数据
* @param out
*/
public static void sendResponse(){
String html = Router.getPageContent(requestUri);
try {
StringBuffer sb = new StringBuffer();
out = new PrintWriter(socket.getOutputStream());
/**
* response header
*///
//封装http响应
sb.append("HTTP/1.1 200\r\n");
sb.append("Server: EvergreenServer\r\n");
sb.append("Date: Mon, 3 April 2015 13:13:33 GMT\r\n");
sb.append("Content-type:text/html;\r\n");
sb.append("Content-Length: " + html.length() + "\r\n");
sb.append("\r\n");
/**
* content
*/
sb.append(html);
out.println(sb.toString());
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Router类:(主要实现对请求url的解析。将html内容返回给响应头。)
package router;
import java.io.*;
/**
* 路由类
* @author Administrator
*
*/
public class Router {
public static String getPageContent(String uri){
File file = new File("web-root" + (uri.lastIndexOf("?") != -1 ? (uri.substring(0, uri.lastIndexOf("?"))) : uri ));
StringBuffer sb = new StringBuffer();
if( file.exists() == false){
sb.append("<center>404 <h4 style=‘color:red;‘>Page Not Found</h4></center>");
}else{
BufferedReader bur = null ;
try {
bur = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
String str = null;
while( (str = bur.readLine()) != null)
sb.append(str);
} catch (Exception e) {
}finally{
if( bur != null)
try {
bur.close();
} catch (IOException e) {
}
}
}
return sb.toString() ;
}
public static void main(String[] args) {
}
}
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原文地址：http://7385573.blog.51cto.com/7375573/1629397
