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自己如何实现简单的http服务器

王朝java/jsp·作者佚名  2006-01-08
窄屏简体版  字體: |||超大  

文件名:MyHttpServerTest.java

import java.io.* ;

import java.net.* ;

import java.util.* ;

/**

* main

*/

public class MyHttpServerTest{

String m_szServerName;//server name

String m_szVersion;//server version

int m_nServerPort;//port

public MyHttpServerTest(String szServerName,String szVersion,int nServerPort){

this.m_szServerName =szServerName;

this.m_szVersion =szVersion;

this.m_nServerPort=nServerPort;

}

/**

* show version information

*/

public void showServerInformation(){

System.out.println("欢迎使用Newman的HTTP服务器!");

System.out.println("Server Name : "+this.m_szServerName);

System.out.println("Server Version: "+this.m_szVersion );

}

public void start (){

this.showServerInformation();

try{

ServerSocket server=new ServerSocket(this.m_nServerPort );

while(true){

Socket client=server.accept();

(new HttpClientThread(client)).run();

}

}

catch(Exception e){

e.printStackTrace();

System.exit(1);

}

}

public static void main(String args[]){

MyHttpServerTest server=new MyHttpServerTest("MyHttpServerTest","1.0",80);

server.start();

}

}

class HttpClientThread implements Runnable {

Socket m_sClient;

HTTPRequest m_Request;

HttpClientThread(Socket sClient)throws IOException{

this.m_sClient =sClient;

this.m_Request =new HTTPRequest(this.m_sClient );

}

public void run(){

try{

System.out.println(this.getConnectInfo());

BufferedOutputStream out=new BufferedOutputStream(this.m_sClient .getOutputStream ());

System.out.println( this.m_Request.getLog());

if(this.m_Request.isGetRequest())

this.processGetRequest(this.m_Request,out);

System.out.println("Request completed. Closing connection.");

this.m_sClient .close ();

}

catch(IOException e){

System.out.println("IOException occurred .");

e.printStackTrace();

}

}

/**

* get Connect Info

*/

public String getConnectInfo(){

String szClientHostName=this.m_sClient .getInetAddress().getHostName ();

String szClientAddress=this.m_sClient .getInetAddress ().getHostAddress();

int ClientPort=this.m_sClient .getPort ();

String szRet="";

szRet="Accepted connection from "+szClientHostName+"("+szClientAddress+") "+"on port "+ClientPort+".";

return szRet;

}

void processGetRequest(HTTPRequest request,BufferedOutputStream out)throws IOException {

String szFileName=request.getFileName ();

File file=new File (szFileName);

if(file.exists ())

this.sendFile (out,file);

else{//文件不存在时

System.out.println ("File "+file.getCanonicalPath()+" does not exist.");

String notfound="<html><head><title>Not Found</title></head><body><h1>"+

"Error 404-file not found</h1><p>"+

"File Name: "+file+" not found"+"<br>"+

"<a href=index.htm>Return Index</a>"+

"</body></html>";

file://out.write(new String("HTTP/1.0 404 no found").getBytes ());

out.write (new String ("HTTP/1.0 200 OK\r\n").getBytes ());

out.write(new String("Content_Length:"+notfound.length()+2).getBytes());

out.write(new String("Content_Type:text/html\r\n\r\n").getBytes ());

out.write(new String(" ").getBytes());

out.write(notfound.getBytes ());

out.flush();

}

}

void sendFile(BufferedOutputStream out,File file){

try{

DataInputStream din=new DataInputStream (new FileInputStream (file ));

int len=(int)file.length();

byte buffer[]=new byte [len];

din.readFully (buffer);

din.close();

out.write (new String ("HTTP/1.0 200 OK\r\n").getBytes ());

out.write (new String ("Content-Length: "+buffer.length +"\r\n").getBytes ());

out.write (new String ("Content-Type: text/html\r\n\r\n").getBytes ());

out.write (buffer);

out.flush ();

out.close ();

System.out.println("File sent: "+file.getCanonicalPath());

System.out.println("Number of bytes: "+len);

}

catch(Exception e){

try{

out.write(("HTTP/1.0 400 " + "No can do" + "\r\n").getBytes());

out.write("Content-Type: text/html\r\n\r\n".getBytes());

}

catch(IOException ioe){

System.out.println("Error retrieving "+file);

}

}

}

}

Vector m_vLines=new Vector ();

Socket m_sClient;

HttpInputStream m_In;

HTTPRequest(Socket client)throws IOException{

this.m_sClient =client;

this.m_In =new HttpInputStream(this.m_sClient.getInputStream());

this.getRequest ();

}

public String getLog(){

StringBuffer szRet=new StringBuffer() ;

szRet.append ("Received the following request:"+"\n");

Enumeration enum=m_vLines.elements ();

String szstr1="";

while(enum.hasMoreElements()){

szstr1=(String)enum.nextElement();

szRet.append (szstr1+"\n");

}

return szstr1.toString();

}

boolean isGetRequest() {

if(this.m_vLines .size ()>0){

String firstline=(String)this.m_vLines.elementAt (0);

if(firstline.length ()>0)

if(firstline.substring(0,3).equalsIgnoreCase ("GET"))

return true;

}

return false;

}

String getFileName() {

if(this.m_vLines .size ()>0){

String firstline=(String)this.m_vLines.elementAt (0);

String filename=firstline.substring (firstline.indexOf (" ")+1);

int n=filename.indexOf (" ");

if(n!=-1)

filename=filename.substring (0,n);

try{

if(filename.charAt(0)=='/' )

filename=filename.substring (1);

}

catch(StringIndexOutOfBoundsException ex){

}

if(filename.equals (""))

filename="index.htm";

if(filename.charAt (filename.length ()-1)=='/')

filename+="index.htm";//not understand

return filename;

}

else

return "";

}

public HttpInputStream getInputStream(){

return this.m_In ;

}

public HTTPRequest getRequest() throws IOException {

String line;

while(true){

line=this.m_In.readLine ();

if(line.length ()>0)

this.m_In.addLine(line);

else

break;

}

return this;

}

/**

* only use to recognize methed "get"

*/

class HttpInputStream extends FilterInputStream {

HttpInputStream(InputStream in){

super(in);

}

public void addLine(String line) {

m_vLines .addElement(line);

}

public String readLine() throws IOException {

StringBuffer result=new StringBuffer ();

boolean finished=false;

boolean isenter=false;

while(!finished){

int ch=-1;

ch=read();

if((isenter)&&(ch==10)){// if it is "\n\r"

result.setLength(result.length()-1);//had added "\n",remove it

return result.toString ();

}

if(ch==13)//if enter pressed

isenter=true;

else

isenter=false;

if(ch==-1)//end

return result.toString ();

else

result.append ((char)ch);

}

return result.toString ();

}

}

}

请多指教

 
 
 
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