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Unfortunately, the default Telnet client on Windows systems is GUI-based and awkward to use for this purpose The GUI window doesn t scroll and automatically clears its text after the request is processed And the Windows client doesn t handle the Unix line-ending convention properly Duplicating the HTTP request functionality with a standalone console-mode Java application is easy enough, however WebClientjava, listed in the following, is a simple Web client designed to be called from a command line:
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import javaio*; import javanet*; import javautil*; public class WebClient { /** * Mainline * Reads command line parameters and creates a new * <CODE>WebClient</CODE> object */ public static void main(String[] args) throws Exception { String host = "localhost"; int port = 80; for (int i = 0; i < argslength; i++) { String arg = args[i]; if (argstartsWith("-")) { if (argequals("-host")) { if (++i >= argslength) throw new RuntimeException ("no argument for " + arg); host = args[i]; } else if (argequals("-port")) { if (++i >= argslength) throw new RuntimeException ("no argument for " + arg); try { port = IntegerparseInt(args[i]); } catch (NumberFormatException e) {
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throw new RuntimeException ("Invalid port number [" + args[i] + "]"); } } else { Systemoutprintln("Invalid argument: " + arg); showUsage(); Systemexit(0); } } else { showUsage(); Systemexit(0); } } new WebClient(host, port); } /** * Displays the calling syntax */ public static void showUsage() { String[] text = { "usage: java WebClient" + " [-host <hostName>]" + " [-port <portNumber>]", }; for (int i = 0; i < textlength; i++) Systemoutprintln(text[i]); } /** * Creates and runs the web client * @param host the HTTP server * @param port the server port number * @exception IOException if a socket error occurs */ public WebClient(String host, int port) throws IOException {
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int contentLength = 0; // Open a socket to the web host Socket socket = new Socket(host, port); // Read input from user and echo it to web host BufferedReader in = new BufferedReader( new InputStreamReader(Systemin)); PrintWriter out = new PrintWriter(socketgetOutputStream()); // First line - request String line = inreadLine(); outprintln(line); // Header lines for (;;) { // Read and echo the line line = inreadLine(); if (line == null) throw new IOException("Unexpected EOF"); line = linetrim(); outprintln(line); // End of headers if (lineequals("")) break; // Otherwise, this is a header int p = lineindexOf(": "); if (p == -1) throw new IOException
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(line + " is not a valid header line"); String name = linesubstring(0, p)trim(); String value = linesubstring(p+1)trim(); if (nameequalsIgnoreCase("Content-Length")) { try { contentLength = IntegerparseInt(value); } catch (NumberFormatException e) { throw new IOException ("Invalid content length " + value); } } } // Read <contentLength> bytes of content if (contentLength > 0) { StringBuffer sb = new StringBuffer(); for (;;) { line = inreadLine(); if (line == null) break; sbappend(line); int len = sblength(); if (len < contentLength) continue; if (len > contentLength) sbsetLength(contentLength); break; } // Write data to output stream outprint(sbtoString()); } outflush(); // The server is now working on the request // Read its output and dump to stdout
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in = new BufferedReader( new InputStreamReader( socketgetInputStream())); out = new PrintWriter(Systemout); for (;;) { line = inreadLine(); if (line == null) break; outprintln(line); } // Close files inclose(); outclose(); socketclose(); } }
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WebClient s calling syntax is java WebClient [-host <hostName>] [-port <portNumber>] When started, it opens a socket connection to the specified host (default is localhost), and then waits for an HTTP request and optional headers to be entered from the keyboard Each line entered by the user is sent out over the socket Input terminates when a blank line is entered This signals to the HTTP server that no more headers will be sent and the request is complete, except possibly for data being sent with a POST request After the request is sent and processed, the server sends back a response, which is echoed to the console A typical exchange might be
D:\jspcr\Chap17\examples>java WebClient POST /jspcr/Chap17/examples/Echojsp HTTP/10 Content-type: application/x-www-form-urlencoded Content-length: 53 speed=on&power=on&flight=on&name=C+Kent&locale=en_US HTTP/11 200 OK
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