知识大全 Java实现简单web服务器

Posted 2022-07-19 知

篇首语：学向勤中得，萤窗万卷书。本文由小常识网(cha138.com)小编为大家整理，主要介绍了知识大全 Java实现简单web服务器相关的知识，希望对你有一定的参考价值。

Java实现简单web服务器 以下文字资料是由(全榜网网www.cha138.com)小编为大家搜集整理后发布的内容，让我们赶快一起来看一下吧！

　　该程序简单实现web服务器目前仅支持和gif/jpeg格式下面是代码

　　import java io * ;

　　import * ;

　　import java util * ;

　　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 = socket accept();

　　processRequest(connection);

　　private static void processRequest(Socket connection) throws Exception

　　final String CRLF = \\r\\n ;

　　Socket socket = connection;

　　// Get a reference to the socket s input and output streams

　　InputStream is = socket getInputStream();

　　DataOutputStream os = new DataOutputStream(socket getOutputStream());

　　// Set up input stream filters

　　BufferedReader br = new BufferedReader(new InputStreamReader(is));

　　// Get the request line of the HTTP request message

　　String requestLine = br readLine();

　　// Extract the filename from the request line

　　StringTokenizer tokens = new StringTokenizer(requestLine);

　　tokens nextToken(); // skip over the method which should be GET

　　String fileName = tokens nextToken();

　　// 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 = Content Type: +

　　contentType(fileName) + CRLF;

　　 else

　　statusLine = HTTP/ Not Found + CRLF;

　　contentTypeLine = Content Type: text/ + CRLF;

　　entityBody = <HTML> +

　　 <HEAD><TITLE>Not Found</TITLE></HEAD> +

　　 <BODY>Not Found</BODY></HTML> ;

　　// Send the status line

　　os writeBytes(statusLine);

　　// Send the content type line

　　os writeBytes(contentTypeLine);

　　// Send a blank line to indicate the end of the header lines

　　os writeBytes(CRLF);

　　// Send the entity body

　　if (fileExists)

　　sendBytes(fis os);

　　fis close();

　　 else

　　fileExists = false;

　　os writeBytes(entityBody) ;

　　// Close streams and socket

　　os close();

　　br close();

　　socket close();

　　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 socket s output stream

　　while ((bytes = fis read(buffer)) != )

　　os write(buffer bytes);

　　private static String contentType(String fileName)

　　if(fileName endsWith( ) || fileName endsWith(l ))

　　return text/ ;

　　else if (fileName endsWith( gif ))

　　return image/gif ;

　　else if (fileName endsWith( jpg ) || fileName endsWith( jpeg ))

　　return image/jpeg ;

　　return application/octet stream ;

cha138/Article/program/Java/hx/201311/25715