//webserver.java 用java编写web服务器
import java.io.*;
import java.net.*;
public class webserver
{
public static void main(string args[])
{
int i=1, port=8080;
serversocket server=null;
socket client=null;
try
{
server=new serversocket(port);
system.out.println("web server is listening on port "+server.getlocalport());
for (;;)
{
client=server.accept(); //接受客户机的连接请求
new connectionthread(client,i).start();
i++;
}
}
catch (exception e) {system.out.println(e);}
}
}
/* connnectionthread类完成与一个web浏览器的通信 */
class connectionthread extends thread
{
socket client; //连接web浏览器的socket字
int counter; //计数器
public connectionthread(socket cl,int c)
{
client=cl;
counter=c;
}
public void run() //线程体
{
try
{
string destip=client.getinetaddress().tostring(); //客户机ip地址
int destport=client.getport(); //客户机端口号
system.out.println("connection "+counter+":connected to "+destip+" on port "+destport+".");
printstream outstream=new printstream(client.getoutputstream());
datainputstream instream=new datainputstream(client.getinputstream());
string inline=instream.readline(); //读取web浏览器提交的请求信息
system.out.println("received:"+inline);
if (getrequest(inline))
{ //如果是get请求
string filename=getfilename(inline);
file file=new file(filename);
if (file.exists())
{ //若文件存在，则将文件送给web浏览器
system.out.println(filename+" requested.");
outstream.println("http/1.0 200 ok");
outstream.println("mime_version:1.0");
outstream.println("content_type:text/html");
int len=(int)file.length();
outstream.println("content_length:"+len);
outstream.println("");
sendfile(outstream,file); //发送文件
outstream.flush();
}
else
{ //文件不存在时
string msg1="<html><head><title>not found</title></head><body><h1>error 404-file not found</h1></body></html>";
outstream.println("http/1.0 404 no found");
outstream.println("content_type:text/html");
outstream.println("content_length:"+msg1.length()+2);
outstream.println("");
outstream.println(msg1);
outstream.flush();
}
}
//instream.close();
//outstream.close();
long m1=1; //延时
while (m1<11100000) {m1++;}
client.close();
}
catch (ioexception e)
{
system.out.println("exception:"+e);
}
}
/* 获取请求类型是否为“get” */
boolean getrequest(string s)
{
if (s.length()>0)
{
if (s.substring(0,3).equalsignorecase("get")) return true;
}
return false;
}
/* 获取要访问的文件名 */
string getfilename(string s)
{
string f=s.substring(s.indexof(' ')+1);
f=f.substring(0,f.indexof(' '));
try
{
if (f.charat(0)=='/')
f=f.substring(1);
}
catch (stringindexoutofboundsexception e)
{
system.out.println("exception:"+e);
}
if (f.equals("")) f="index.html";
return f;
}
/*把指定文件发送给web浏览器 */
void sendfile(printstream outs,file file)
{
try
{
datainputstream in=new datainputstream(new fileinputstream(file));
int len=(int)file.length();
byte buf[]=new byte[len];
in.readfully(buf);
outs.write(buf,0,len);
/*
dataoutputstream ou=new dataoutputstream(system.out);
ou.write(buf,0,len);
*/
outs.flush();
in.close();
}
catch (exception e)
{
system.out.println("error retrieving file.");
system.exit(1);
}
}
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