Java Web基本实例

文章由LinuxBoy分享于2019-03-31 11:03:13热评（341）

Java Web基本实例

Java Web基本实例：

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

WebServer.java监听某个端口
public class WebServer {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int port=80;
if(args.length==1){
port=Integer.parseInt(args[0]);

} new WebServer().serverStart(port);
}

//对80端口监听
public void serverStart(int port){
try {
   ServerSocket serverScoket =new ServerSocket(port);
   while(true){
    Socket scoket=serverScoket.accept();
    new Processor(scoket).start();
   }
} catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
}
}
}

Processor.java 处理请求文件是否存在。存在则返回给客户端，不存在则返回404

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.Socket;

public class Processor extends Thread{
private Socket socket;
private final static String WEB_ROOT="E:\\zhxh\\web\\SpringSecurity";
private InputStream inputStream;
private OutputStream out;
public Processor(Socket socket){
this.socket=socket;
try {
inputStream=socket.getInputStream();
out=socket.getOutputStream();
} catch (IOException e) {

e.printStackTrace();
}
}
public void run(){
String fileName=parse(inputStream);//用户发过来的协议内容
sendFile(fileName);
}

public String parse(InputStream in){
String fileName="";
BufferedReader br=new BufferedReader(new InputStreamReader(in));
try {
String httpMessage=br.readLine();//获取第一行数据:用空格隔开的
     String[]content=httpMessage.split(" ");
     //1部分协议状态，2请求文件的名称，3协议版本号
     if(content.length!=3){
      sendErrorMessage(400,"客户请求错误");
      return null;
     }
     for(String str:content)
     System.out.println(str);
     fileName=content[1];
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return fileName;

}
public void sendErrorMessage(int errorCode,String errorMessage){
PrintStream pOut=new PrintStream(out);
pOut.println("HTTP/1.0 "+errorCode+" "+errorMessage+"");//协议版本，状态码，信息
pOut.println("content-type:text/html");
pOut.println();
pOut.println("<html><title>错误信息</title><body><h1>errorCode:"+errorCode+","+errorMessage+"</h1></body></html>");
pOut.close();
try {
out.close();
inputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
public void sendFile(String fileName){
PrintStream pOut=new PrintStream(out);
System.out.println(Processor.WEB_ROOT+fileName);
File file=new File(Processor.WEB_ROOT+fileName);
if(!file.exists()){
sendErrorMessage(404,"资源不存在");
}
else {
try {
   InputStream in=new FileInputStream(file);
   byte[]content=new byte[(int)file.length()];
   in.read(content);
pOut.println("HTTP/1.0 200 查询文件");//协议版本，状态码，信息
pOut.println("content-length:"+content.length);
pOut.println();
pOut.write(content);
pOut.flush();
pOut.close();
out.close();
inputStream.close();

} catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
} catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
}
}

}
}

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