t.java

java编程的一些Applets例子。值得深入研究一下。

/* 
All code runs under JDK-beta and Navigator 2.0b1-3, proven with solaris 2.3 and win95.

Thomas Wendt	MT/FB16
Tel.: ++49561 804 6428	University of Kassel
email: [e-mail] http://www.uni-kassel.de/fb16/ipm/mt/staff/thwendte.html 

*/

/*
* Permission to use, copy, modify and distribute this software and its * documentation without fee is hereby granted provided that: * a) this notice with a reference to the original source and * the author appears in all copies or derivatives of this software. * b) a reference to the original source and the author appears in all files * generated using copies or derivatives of this software. *
* THE AUTHOR MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF * THIS SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. THE AUTHOR SHALL NOT BE LIABLE FOR * ANY DAMAGES SUFFERED BY ANYBODY AS A RESULT OF USING, MODIFYING OR * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. */

import java.io.*;
import java.lang.*;

/**
* doccnv - converts HTML-Dokuments generated using javadoc<br> * <p>
* Parameters:<pre>
* -in afile from javadoc
* -out afile to be generated
* -api apath to api-documentation, usually .../java/api/ or .../java/apidocs/ * -i	replaces images with its alternatives
* -u	unix-style output (lf only)
*</pre><p>
* Usage:<br>
* If api is given, it prepends all references to java.* classes and all references to images. * Because the commandline must not contain '|', ':' is used instead and internally replaced, if it * is not part of the protocol. The flag i overrides the api parameter for images in such a * manner, that the text in the 'alt' parameter of the image is used instead of using the image * itself. in and out must be given, api and the flags are optional. If neither api or the * flag exist, out would be a copy of in. in must not equal out.<br> *
* <p>Example: <br>
* java doccnv -in doccnv.html -out doccnv.htm -api file://h:/www/java/apidocs/ -iu<br> *
* <p>V b1.00, 11/12/95: Creation by Thomas Wendt (thw)<br> * V b1.01, 11/18/95: Cleaning up the code by thw<br> *
* <p><a href="http://www.uni-kassel.de/fb16/ipm/mt/java/javae.html"><b>origin</b></a> of doccnv. *
* @author <a href="http://www.uni-kassel.de/fb16/ipm/mt/staff/thwendte.html">Thomas Wendt</a> * @version b1.01, 11/18/1995
*/
class doccnv {
// Note: All needs to be static, because this class is never instantiated. 

/** The inputstream. */
public static DataInputStream is = null; 

/**
* The outputstream.
* Using <a href="java.io.PrintStream">PrintStream</a> would be nice, * but it does not allow handling of errors or setting EOL. */
public static DataOutputStream os = null; 

/** EOL for the lines written. Default: cr+lf, if unix flag set: lf. */ public static String crlf = "\r\n";

/* The filenames */
static String outputfile = "";
static String inputfile = "";

/**
* Do the job.
*/
public static void main(String args[]) { 
int i = 0, f, j, p;
String s;
boolean replImg = false;
boolean replApi = false;
String jPath = "";

System.out.println("doccnv by Thomas Wendt"); 

// while argument exist
while (i < args.length && args[i].startsWith("-")) { 
s = args[i++];
if (s.equals("-out")) { // filename of output 
if (i < args.length)
outputfile = args[i++];
else
System.err.println("-out requires a filename"); } else if (s.equals("-in")) { // filename of input 
if (i < args.length)
inputfile = args[i++];
else
System.err.println("-in requires a filename"); } else if (s.equals("-api")) { // pathname or URL of api, with ending / 
if (i < args.length) {
jPath = args[i++];
// '|' cant be given at cmdline, so use and convert ':' 
if ((p = jPath.indexOf(':',6)) > -1) {
jPath = jPath.substring(0,p)+'|'+jPath.substring(p+1); }
replApi = true;
} else
System.err.println("-api requires a pathname or URL"); } else { // check options
for (j = 1; j < s.length(); j++) {
switch (s.charAt(j)) {
case 'i': // replace image with its alt text 
replImg = true;
break;
case 'u': // use unix style output with lf only 
crlf = "\n";
break;
default: // nothing matches: print err msg 
System.err.println("illegal option " + s.charAt(j)); break;
}
}
}
}

// Quit, if param missing or wrong
if (inputfile.equals("") || outputfile.equals("") || inputfile.equals(outputfile)) { 
quit("Usage: java doccnv [-iu] [-api aURL] -out afile -in afile, out != in"); return;
} else if (!(replApi || replImg)) {
quit("Nothing to do!");
return;
}

// Open streams and exit, if error
try { is = new DataInputStream(new FileInputStream(inputfile)); } catch (java.io.IOException e) { quit("Error accessing "+inputfile); } try { os = new DataOutputStream(new FileOutputStream(outputfile)); } catch (java.io.IOException e) { quit("Error creating "+outputfile); } 

// Init some constants
String d = ""+'"'; // silly construction, isn't it? (no constructor for single char) String im = "<img ";
String src = " src="+d;
String ja = " href="+d+"java.";
String alt = " alt="+d;
String bo = "</body>";
boolean ok;

// while not eof
s = readln();
while (s != null) {

// Replace or extend img tags. Use while, because multiple img tags may exist. f = -1;
while ((f = s.indexOf(im,f+1)) > -1) {
if (replImg) {
p = s.indexOf(d,s.indexOf(alt,f))+1;
s = s.substring(p,s.indexOf(d,p));
} else if (replApi) {
p = s.indexOf(d, s.indexOf(src,f))+1;
s = s.substring(0,p)+jPath+s.substring(p); }
}

// Extend refs to the API. Use while, because multiple refs may exist. f = -1;
while (replApi && (f = s.indexOf(ja,f+1)) > -1) { 
p = s.indexOf(d,f)+1;
s = s.substring(0,p)+jPath+s.substring(p); }

// Last line? Then output some info about the program. if (s.indexOf(bo) > -1) {
String fi = "<a href="+d+"http://www.uni-kassel.de/fb16/ipm/mt/"; String la = ".html"+d+">";
println("<p><hr><p>Converted using "+fi+"java/javae"+la+"doccnv</a> by"); println(fi+"staff/thwendte"+la+"Thomas Wendt</a>"); }

// Output the converted line and read in the next one. println(s);
s = readln();
}

// Flush and/or close the streams.
try {
os.flush();
os.close();
}
catch (java.io.IOException e) { quit("Error flushing/closing "+outputfile); } try { is.close(); }
catch (java.io.IOException e) { }
}

/**
* Write a line to outputstream with error handling * Exit, if error occurs.
* @see #os
* @param s the line to write
*/
public static void println(String s) {
try { os.writeBytes(s+crlf); }
catch (java.io.IOException e) { quit("Error writing "+outputfile); } }

/**
* Read a line from inputstream with error handling * @see #is
* @return The line read or null, if eof or error. */
public static String readln() {
String s;
try { s = is.readLine(); }
catch (java.io.IOException e) { return null; } return s;
}

/**
* Exit
* Print an error message, if one is given. * @param s The text describing the Error. If null, exitcode = 0; 1 otherwise. */
public static void quit(String s) {
Runtime r = Runtime.getRuntime();
if (s != null) {
System.out.println();
System.err.println(s);
r.exit(1);
} else r.exit(0);
}

}
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/*
* Permission to use, copy, modify and distribute this software and its * documentation without fee for NON-COMMERCIAL purposes is hereby granted * provided that this notice with a reference to the original source and * the author appears in all copies or derivatives of this software. *
* THE AUTHOR MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF * THIS SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. THE AUTHOR SHALL NOT BE LIABLE FOR * ANY DAMAGES SUFFERED BY ANYBODY AS A RESULT OF USING, MODIFYING OR * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. */

import java.awt.*;
import java.lang.*;
import java.io.*;
import java.net.*;
import java.util.*;
import java.applet.*;

/**
* form - uses java as a form-substitute<br> *
* <p>Parameters:<br>
* desc=String	Question for Checkbox (Question)<br>
* subj=String	Fixed subject of message (Form)<br>
* comment=String	Label for Textarea (Comment)<br>
* href=String	recipient script/base path (don't send)<br>
* type=String	email, cgi (statistics)<br>
* recip=String	email adress of recipient (don't send)<br>
* buttons=String[2][] Button desc/transmit (Answer,x)<br> *
* <p>v1.00 prebeta by Thomas Wendt (thw)<br> * v1.10 changed to use statistics instead of smtp by thw<br> * v1.20, 10/19/95 use awt-buttons and input-line by thw<br> * v1.21, 11/18/95 cleaning up the code by thw<br> *
* <p><a href="http://www.uni-kassel.de/fb16/ipm/mt/java/javae.html"><b>origin</b></a> of form.<br> *
* @author <A HREF="http://www.uni-kassel.de/fb16/ipm/mt/staff/thwendt.html">Thomas Wendt</A> * @version b1.21 , 11/18/95
*/
public class form extends Applet {
/** The base URL or the recipient of the form. */ public String base;

/** The messages to send. */
public String msgs[] = new String[10];

/** The Text of the checkboxes. */
public String descs[] = new String[10];

/** The Subject of the message. */
public String subj;

/** The Recipient of the message. */
public String recip;

/** The buttons group */
public CheckboxGroup check = new CheckboxGroup(); 

/** The buttons count. */
public int cntbu=0;

/** The Text. */
public TextField text;

/** Use email? */
public boolean doMail = false;

/** Use cgi script? */
public boolean doCgi = false;

/** Read the attributes and setup the UI. */ public void init () {
// figure out what they want from me and set up according String attr = getParameter("type");
if (attr != null) {
if (attr.equalsIgnoreCase("cgi")) { doCgi = true; } // not impl. yet else if (attr.equalsIgnoreCase("email")) { doMail = true; } 
}
if ((base = getParameter("href")) == null && (!doMail)) { return; } if ((recip = getParameter("recip")) == null && (doMail || doCgi)) { return; } if ((subj = getParameter("subj")) == null) { subj = "Form"; } setLayout(new BorderLayout());

// our button
Panel pb = new Panel();
pb.add(new Button("Send"));

// set up the textfield
if ((attr = getParameter("comment")) == null) { attr = "Comment"; } Panel pt = new Panel();
Label la = new Label(attr, Label.LEFT);
pt.add(la);
pt.add(text = new TextField(30));

// we dont transmit text with statistics, but we need the field for layouting // Note: We can transmit text, it _is_ unsecure. The people maintaining _our_ // webserver will kill me, if _I_ do it in this way. if (!doMail && !doCgi) {
la.disable();
text.disable();
}

// setup checkboxes
if ((attr = getParameter("buttons")) == null) { attr = "Answer,x"; } StringTokenizer st = new StringTokenizer(attr, ","); while (st.hasMoreTokens()) {
descs[cntbu] = st.nextToken();
msgs[cntbu] = st.nextToken();
cntbu++;
}
if ((attr = getParameter("desc")) == null) { attr = "Question"; } Panel pc = new Panel();
pc.add(new Label(attr, Label.LEFT));
for (int i=0; i<cntbu; i++) { pc.add(new Checkbox(descs[i], check, i<1)); } 

// put all together in the applet
add("North", pc);
add("Center",pt);
add("South",pb);
}

/** Parameter Info. */
public String[][] getParameterInfo() {
String[][] info = {
{"desc", "String",	"Question for Checkbox (Question)"},
{"subj", "String",	"Fixed subject of message (Form)"},
{"comment", "String",	"Label for Textarea (Comment)"},
{"href", "String",	"base/script to send (dont send)"},
{"type", "String",	"email, cgi (statistics)"},
{"recip", "String",	"email of recipient (dont send)"},
{"buttons", "String[2][]", "Button desc/transmit (Answer,x)"}, };
return info;
}

/** Applet Info. */
public String getAppletInfo() {
return "form.java, V b1.21, 11/18/95 by Thomas Wendt, http://www.uni-kassel.de/fb16/ipm/mt/staff/thwendte.html"; }

/** Send the Form as email (not working now). */ public void sendMail(String S) { ;}

/** Send the Form using script get or statistics. */ public void send() {
// get label of checked box
String s = check.getCurrent().getLabel(); // and search, what to send in this case. for (int i = 0; i < cntbu; i++) { if (s.equals(descs[i])) { s = msgs[i]; } } showStatus("Connecting");
if (doMail) { sendMail(s); }
else {
try {
// calc the 'URL' of the script to get a dummy document // MAY ANYBODY GIVE ME A SCRIPT FOR THIS ???? if (doCgi) { s = base+"&R"+recip+"&S="+subj+"&B="+s+"&T="+text.getText(); } // or just touch another dummy document for statistics. else { s = base+s+".html"; }
URL url_ = new URL(s);
URLConnection urlc = url_.openConnection(); InputStream is = urlc.getInputStream();
byte b[] = new byte[400];
int i = is.read(b); // get the stuff, needed ?? is.close();
}
catch (Exception e) { }
}
// remove everything to avoid duplicates removeAll();
showStatus(" ");
}

/** Send the form, if 'send' button pressed. */ public boolean action(Event evt, Object obj) { 
if ("Send".equals(obj)) {
send();
return true;
} else { return false; }
}
}
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