该程序简单实现web服务器目前仅支持html和gif/jpeg格式下面是代码
import javaio* ;
import * ;
import javautil* ;
public class SimpleWebServer {
public static void main(String argv[]) throws Exception {
//Get the port as an argument
// Also you could hard code the port to point to or any other port
int port = (new Integer(argv[]))intValue();
// Establish the listen socket
ServerSocket socket = new ServerSocket(port);
while(true){
// Listen for a TCP connection request
Socket connection = socketaccept();
processRequest(connection);
}
}
private static void processRequest(Socket connection) throws Exception {
final String CRLF = \r\n;
Socket socket = connection;
// Get a reference to the sockets input and output streams
InputStream is = socketgetInputStream();
DataOutputStream os = new DataOutputStream(socketgetOutputStream());
// Set up input stream filters
BufferedReader br = new BufferedReader(new InputStreamReader(is));
// Get the request line of the HTTP request message
String requestLine = brreadLine();
// Extract the filename from the request line
StringTokenizer tokens = new StringTokenizer(requestLine);
tokensnextToken(); // skip over the method which should be GET
String fileName = tokensnextToken();
// Prepend a so that file request is within the current directory
fileName = /root/ + fileName ;
// Open the requested file
FileInputStream fis = null ;
boolean fileExists = true ;
try {
fis = new FileInputStream(fileName);
} catch (FileNotFoundException e) {
fileExists = false ;
}
// Construct the response message
String statusLine = null;
String contentTypeLine = null;
String entityBody = null;
if (fileExists) {
statusLine = HTTP/ OK + CRLF;
contentTypeLine = ContentType: +
contentType(fileName) + CRLF;
} else {
statusLine = HTTP/ Not Found + CRLF;
contentTypeLine = ContentType: text/html + CRLF;
entityBody = <HTML> +
<HEAD><TITLE>Not Found</TITLE></HEAD> +
<BODY>Not Found</BODY></HTML>;
}
// Send the status line
oswriteBytes(statusLine);
// Send the content type line
oswriteBytes(contentTypeLine);
// Send a blank line to indicate the end of the header lines
oswriteBytes(CRLF);
// Send the entity body
if (fileExists) {
sendBytes(fis os);
fisclose();
} else {
fileExists = false;
oswriteBytes(entityBody) ;
}
// Close streams and socket
osclose();
brclose();
socketclose();
}
private static void sendBytes(FileInputStream fis
OutputStream os) throws Exception {
// Construct a K buffer to hold bytes on their way to the socket
byte[] buffer = new byte[];
int bytes = ;
// Copy requested file into the sockets output stream
while ((bytes = fisread(buffer)) != ) {
oswrite(buffer bytes);
}
}
private static String contentType(String fileName) {
if(fileNameendsWith() || fileNameendsWith(l)) {
return text/html;
}
else if (fileNameendsWith(gif)) {
return image/gif;
}
else if (fileNameendsWith(jpg) || fileNameendsWith(jpeg)){
return image/jpeg;
}
return application/octetstream ;
}
}
