<h3>最近復(fù)習(xí)計(jì)算機(jī)網(wǎng)絡(luò)唾戚，復(fù)習(xí)完應(yīng)用層之后對(duì)于理論知識(shí)還是沒有一個(gè)深刻的概念柳洋，索性就動(dòng)手用Java Socket API 模擬做一個(gè)HTTP服務(wù)器，鞏固一下應(yīng)用層的知識(shí)叹坦。</h3>
<blockquote>
HTTP基于TCP協(xié)議熊镣，協(xié)議采用了請(qǐng)求/響應(yīng)模型。客戶端向服務(wù)器發(fā)送一個(gè)請(qǐng)求绪囱，請(qǐng)求頭包含請(qǐng)求的方法测蹲、URL、協(xié)議版本毕箍、以及包含請(qǐng)求修飾符、客戶信息和內(nèi)容的類似于MIME的消息結(jié)構(gòu)道盏。服務(wù)器以一個(gè)狀態(tài)行作為響應(yīng)而柑，響應(yīng)的內(nèi)容包括消息協(xié)議的版本，成功或者錯(cuò)誤編碼加上包含服務(wù)器信息荷逞、實(shí)體元信息以及可能的實(shí)體內(nèi)容——百度百科媒咳。
話不多說，還是直接上圖种远。
</blockquote>
具體字段這里不作解釋涩澡，不懂的請(qǐng)先自己了解http協(xié)議。這里主要是根據(jù)請(qǐng)求響應(yīng)這一過程模擬HTTP服務(wù)器坠敷。
下面是代碼：
<pre>
package com.example.httpserver;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class HttpServer {
private static final Integer port = 80;//HTTP默認(rèn)端口80
public static void main(String[] args) {
ServerSocket serverSocket;
try {
//建立服務(wù)器Socket,監(jiān)聽客戶端請(qǐng)求
serverSocket = new ServerSocket(port);
System.out.println("Server is running on port:"+serverSocket.getLocalPort());
//死循環(huán)不間斷監(jiān)聽客戶端請(qǐng)求
while(true){
final Socket socket = serverSocket.accept();
System.out.println("biuld a new tcp link with client,the cient address:"+
socket.getInetAddress()+":"+socket.getPort());
//并發(fā)處理HTTP客戶端請(qǐng)求
service(socket);
}
} catch (IOException e) {
e.printStackTrace();
}
}
public static void service(Socket socket)
{
new Thread(){
public void run(){
InputStream inSocket;
try {
//獲取HTTP請(qǐng)求頭
inSocket = socket.getInputStream();
int size = inSocket.available();
byte[] buffer = new byte[size];
inSocket.read(buffer);
String request = new String(buffer);
System.out.println("ClientBrowser:\n"+request+"\n"
+ "------------------------------------------------------------------");
String firstLineOfRequest = "";
String[] heads;
String uri = "/index.html";
String contentType ="";
if(request.length() > 0){
firstLineOfRequest = request.substring(0,request.indexOf("\r\n"));
heads = firstLineOfRequest.split(" ");
uri = heads[1];
if(uri.indexOf("html") != -1){
contentType = "text/html";
}else{
contentType = "application/octet-stream";
}
}
//將響應(yīng)頭發(fā)送給客戶端
String responseFirstLine = "HTTP/1.1 200 OK\r\n";
String responseHead = "Content-Type:" + contentType +"\r\n";
OutputStream outSocket = socket.getOutputStream();
System.out.println("ServerResponse:\n"+responseFirstLine+"\n"+responseHead+"\n"
+ "--------------------------------------------------------------------");
outSocket.write(responseFirstLine.getBytes());
outSocket.write(responseHead.getBytes());
//通過HTTP請(qǐng)求中的uri讀取相應(yīng)文件發(fā)送給客戶端
FileInputStream writehtml = new FileInputStream(new File("wwwroot"+uri));
outSocket.write("\r\n".getBytes());
byte[] htmlbuffer = new byte[writehtml.available()];
if(writehtml !=null){
int len = 0;
System.out.println("writeHtml");
while((len = writehtml.read(htmlbuffer)) != -1){
outSocket.write(htmlbuffer, 0,len);
}
}
outSocket.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
}
}
</pre>
代碼看注釋也很容易理解∶钔現(xiàn)在我們?cè)跒g覽器中輸入服務(wù)器地址+要訪問的文件
在看我們控制臺(tái)輸出的內(nèi)容：
<h5>以上就是Java Socket 簡(jiǎn)單的模擬HTTP服務(wù)器全過程。</h5>
