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An HTTPServer object is created using either of the following constructors If the constructor doesn t specify the port to be used, the TCP port number defaults to 80
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public HTTPServer() throws HTTPServerException public HTTPServer(int httpPort) throws HTTPServerException
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If the speci ed port is already in use by another thread or process, the constructor will be unable to create a ServerSocket to listen for connections on the speci ed port and will throw an HTTPServerException The HTTP root directory and index page default to webroot and indexhtml, respectively To change these defaults, an application can use the setHTTPRoot and setIndexPage methods
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public void setHTTPRoot(String httpRoot) public void setIndexPage(String indexPage)
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Both of the serviceRequest methods block inde nitely waiting for an inbound connection from a client (for example, a browser)
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public int serviceRequests() throws HTTPServerException public int serviceRequests(Object lock) throws HTTPServerException
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The only difference between the two is that the serviceRequests method that requires the lock parameter will synchronize on the lock before servicing an inbound connection This method should be used by an application that will be modifying the contents of les, at or below the Web root, from within another thread Either method will cause the server to create a new thread for each request The application typically dedicates a single thread that invokes the serviceRequests method in an in nite loop No other action is required of the application for HTTPServer to continue processing client GET requests Because HTTPServer is very small and simple by design, it doesn t meet every application s requirements as a general purpose Web server However, there exist powerful, full-featured, commercial grade HTTP servers5 written for TINI that support the Java servlet API Applications that need access to information provided by Web servers use the familiar URL classes in the javanet package There is one additional con guration parameter that can be set by an application using the URL classes: a proxy server Often corporate networks are protected behind a rewall and the only way HTTP requests can reach the Internet is through a proxy server A proxy server is simply a machine that receives requests from a client and forwards them to another server The proxy server has special privileges to communicate with hosts
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5 One such server (TiniHttpServer), available from Smart Software Consulting, is free and OpenSource It can be downloaded from http://wwwsmartsccom/tini/TiniHttpServer
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outside the rewall The TININet class provides the following methods for con guring the use of a proxy server
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public static boolean setProxyServer(String proxyServer) public static boolean setProxyPort(int proxyPort)
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The setProxyServer method takes the server name as a String representing either an IP address encoded in dotted-decimal notation or a DNS name The setProxyPort method takes an integer value specifying the 16-bit port number on which the proxy server receives HTTP requests Both the server and port are persistent across system reboots If setProxyServer is invoked with an empty String, it will disable the use of a proxy server By default, the URL protocol handling classes do not use a proxy Listing 53 shows a small application that reads the contents of a URL through a proxy server Listing 53 MiniBrowser
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import javanet*; import javaio*; import comdalsemitininetTININet; class MiniBrowser { public static void main(String[] args) { if (argslength != 3) { Systemoutprintln( "Usage: MiniBrowser URL proxy_server proxy_port"); Systemexit(1); } TININetsetProxyServer(args[1]); TININetsetProxyPort(IntegerparseInt(args[2])); try { URL u = new URL(args[0]); InputStream in = uopenConnection()getInputStream(); byte[] content = new byte[512]; int count = 0; do { count = inread(content); Systemoutwrite(content, 0, count); } while (count != -1); } catch (Exception e) { Systemoutprintln(egetMessage()); eprintStackTrace(); } } }
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MiniBrowser requires that the URL, proxy server name (or IP address), and proxy port be speci ed on the command line After setting both the proxy server and proxy port, it opens a connection to the speci ed URL It then reads the contents of the URL in 512-byte blocks and displays them using Systemout The following is the output from browsing the small HelloWeb application, from Section 263 In this test con guration one TINI is running the HelloWeb HTTP server application and another TINI (behind a rewall) is running MiniBrowser The only way for HTTP requests to escape the rewall is through the proxy server named wally on port 576
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TINI /> java MiniBrowsertini http://1983123182/indexhtml wallydalsemicom 576 <html> <head> <title>Hello Web!</title> </head> <body> <h1>Hello from TINI!</h1> </body> </html>
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The output should look familiar as it is identical to the contents of the indexhtml le that we created to be served by HelloWeb
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