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由JComponent生成BufferedImage

��米 — Fri, 14 Apr 2006 15:41:00 GMT

最�q�在弄swing�Q�需要由JComponent生成BufferedImage�Q�在CSDN上发��C��个好例子。下面是范例�Q?br />

Rectangle rect = comp.getBounds();
BufferedImage bufImage = new BufferedImage(rect.width,
rect.height,
BufferedImage.TYPE_INT_RGB);
Graphics g = bufImage.getGraphics();
g.translate(-rect.x, -rect.y);
comp.paint(g);

�q�样�Q�JComponent中的囑փ��׃��存到BufferedImage中了�?br />原文的链接：http://dev.csdn.net/article/13/13531.shtm

��米 2006-04-14 23:41 发表评论

如何��BufferedImage实例保存为BMP文�g

��米 — Mon, 04 Jul 2005 09:33:00 GMT

摘要: 要将BufferedImage实例保存为BMP文�g�Q�就需要知道BMP文�g的格式，可以参考我转蝲的文章：《BMP文�g格式》�?nbsp; 下面是我的将BufferedImage实例保存�?4位色BMP文�g的实现�?nbsp; ... 阅读全文

��米 2005-07-04 17:33 发表评论

关闭JBuilder2005的Smart MemberInsight功能

��米 — Wed, 15 Jun 2005 08:02:00 GMT

JBuilder 2005中多了一个Smart MemberInsight功能�Q�这个功能会��的匹配需要调用的�Ҏ��或者获取的属性。例如有一个赋值操作，左边是一个List�Q�右�Ҏ��用一个方法获取��|��那么当输�?."�Ӟ��JBuilder 2005会自动的扑ֈ�所有返回的��gؓList的方法�?BR> 不过�Q�这实在是一个不怎么讨好的方法。因为很多时候�ƈ不是只有一层方法调用的�Q�例如，当需要用一个方法获取一个实例，然后再用�q�个实例的方法获取需要的值时�Q�这个功能就昑־�很碍手了�?BR> �l�于�Q�我�q�是军_��关闭�q�个“智能”的功能。打开"Tools"—�?gt;"Preferences"�Q�在"Editor"的子��?CodeInsight"里，展开"MemberInsight"�Q�把"Default to Smart MemberInsight"�q�一��去掉。如下图所�C�：

��米 2005-06-15 16:02 发表评论

��米 — Tue, 14 Jun 2005 10:40:00 GMT

�q�个范例说明如何用JFreeChart�ȝ��单的��q��图，下面是一个JSP的简单范例：

<%@ page contentType="text/html; charset=GB2312" %>
<%@ page import="java.awt.*, java.text.*, java.util.*" %>
<%@ page import="org.jfree.chart.*" %>
<%@ page import="org.jfree.chart.axis.*" %>
<%@ page import="org.jfree.chart.labels.StandardCategoryItemLabelGenerator" %>
<%@ page import="org.jfree.chart.plot.*" %>
<%@ page import="org.jfree.chart.renderer.*" %>
<%@ page import="org.jfree.chart.servlet.ServletUtilities" %>
<%@ page import="org.jfree.data.DefaultCategoryDataset" %>
<%@ page import="org.jfree.ui.TextAnchor" %>

<%
  //The data for the bar chart
  double[] data = {85, 156, 179.5, 211, 123};
  //The labels for the bar chart
  String[] labels = {"Mon", "Tue", "Wed", "Thu", "Fri"};

  DefaultCategoryDataset dataset = new DefaultCategoryDataset();
  for (int i = 0; i < data.length; i++) {
    dataset.addValue(data[i], null, labels[i]);
  }

  JFreeChart chart = ChartFactory.createBarChart3D("Weekly Server Load", "Work Week 25", "MBytes", dataset, PlotOrientation.VERTICAL, false, false, false);
  chart.setBackgroundPaint(new Color(0xE1E1E1));

  CategoryPlot plot = chart.getCategoryPlot();

  // 讄��Y轴显�C�整�?/SPAN>
  NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
  rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

  CategoryAxis domainAxis = plot.getDomainAxis();
  //讄��距离囄��左端距离
  domainAxis.setLowerMargin(0.05);

  BarRenderer3D renderer = new BarRenderer3D();
  //讄��q��颜色
  renderer.setSeriesPaint(0, new Color(0xff00));
  plot.setRenderer(renderer);

  String filename = ServletUtilities.saveChartAsPNG(chart, 300, 280, null, session);
  String graphURL = request.getContextPath() + "/displayChart?filename=" + filename;
%>
<html>
<body topmargin="5" leftmargin="5" rightmargin="0">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    3D Bar Chart
div>
<br>
<img src="<%= graphURL %>" border=0>
body>
html>

��d��来的图：

和ChartDirector��d��来的囑ց�一个比较：

��米 2005-06-14 18:40 发表评论

��米 — Tue, 14 Jun 2005 09:46:00 GMT

以前一直是用JFreeChart�ȝ��计图的，不过JFreeChart��d��来的囑�Ş不够�_��Q�看��h��有些模糊�Q�今天在�|�上看到另外一个工具ChartDirector�Q�这是一个商业版本的工具�Q�不�q�也可以免费使用�Q�只是在��d��来的囑�Ş下面都有一条它的广告条�?BR> 下面是它的一个柱状图的例子：

范例�E�序�Q?BR>

<%@page import="ChartDirector.*" %>
<%
//The data for the bar chart
double[] data = {85, 156, 179.5, 211, 123};

//The labels for the bar chart
String[] labels = {"Mon", "Tue", "Wed", "Thu", "Fri"};

//Create a XYChart object of size 300 x 280 pixels
XYChart c = new XYChart(300, 280);

//Set the plotarea at (45, 30) and of size 200 x 200 pixels
c.setPlotArea(45, 30, 200, 200);

//Add a title to the chart
c.addTitle("Weekly Server Load");

//Add a title to the y axis
c.yAxis().setTitle("MBytes");

//Add a title to the x axis
c.xAxis().setTitle("Work Week 25");

//Add a bar chart layer with green (0x00ff00) bars using the given data
c.addBarLayer(data, 0xff00).set3D();

//Set the labels on the x axis.
c.xAxis().setLabels(labels);

//output the chart
String chart1URL = c.makeSession(request, "chart1");

//include tool tip for the chart
String imageMap1 = c.getHTMLImageMap("", "", "title='{xLabel}: {value} MBytes'")
    ;
%>
<html>
<body topmargin="5" leftmargin="5" rightmargin="0">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    3D Bar Chart
div>
<hr color="#000080">
<a href="viewsource.jsp?file=<%=request.getServletPath()%>">
    <font size="2" face="Verdana">View Chart Source Codefont>
a>
div>
<br>
<img src='<%=response.encodeURL("getchart.jsp?"+chart1URL)%>'
    usemap="#map1" border="0">
<map name="map1"><%=imageMap1%>map>
body>
html>

如果要在��q��剙��昄��数��|��可以调用Layer的setDataLabelFormat�Ҏ��讄��Q�范例：layer.setDataLabelFormat("{value}");

其它的例子可以参考它的文档的说明。ChartDirector的网址�Q?A >http://www.advsofteng.com

��米 2005-06-14 17:46 发表评论

用java.util.Timer定时执行��d��

��米 — Thu, 09 Jun 2005 02:29:00 GMT

如果要在�E�序中定时执行�Q务，可以使用java.util.Timer�q�个�c�d��现。��用Timer�c�需要一个��承了java.util.TimerTask的类。TimerTask是一个虚�c�，需要实现它的run�Ҏ��Q�实际上是他implements了Runnable接口�Q�而把run�Ҏ��留给子类实现�?BR> 下面是我的一个例子：

class Worker extends TimerTask {
  public void run() {
    System.out.println("我在工作啦！");
  }
}

Timer�cȝ��schedule�Ҏ��或者scheduleAtFixedRate�Ҏ��启动定时执行�Q�schedule重蝲了四个版本，scheduleAtFixedRate重蝲了两个。每个方法的实现都不同，下面是每个方法的说明�Q?BR>

schedule

public void schedule(TimerTask task,
                     long delay)

Schedules the specified task for execution after the specified delay.

Parameters:: task - task to be scheduled.; delay - delay in milliseconds before task is to be executed.
Throws:: IllegalArgumentException - if delay is negative, or delay + System.currentTimeMillis() is negative.; IllegalStateException - if task was already scheduled or cancelled, or timer was cancelled.

说明�Q�该�Ҏ��会在讑֮�的�g时后执行一�ơ�Q务�?BR>

schedule

public void schedule(TimerTask task,
                     Date time)

Schedules the specified task for execution at the specified time. If the time is in the past, the task is scheduled for immediate execution.

Parameters:: task - task to be scheduled.; time - time at which task is to be executed.
Throws:: IllegalArgumentException - if time.getTime() is negative.; IllegalStateException - if task was already scheduled or cancelled, timer was cancelled, or timer thread terminated.

说明�Q�该�Ҏ��会在指定的时间点执行一�ơ�Q务�?BR>

schedule

public void schedule(TimerTask task,
                     long delay,
                     long period)

Schedules the specified task for repeated fixed-delay execution, beginning after the specified delay. Subsequent executions take place at approximately regular intervals separated by the specified period.

In fixed-delay execution, each execution is scheduled relative to the actual execution time of the previous execution. If an execution is delayed for any reason (such as garbage collection or other background activity), subsequent executions will be delayed as well. In the long run, the frequency of execution will generally be slightly lower than the reciprocal of the specified period (assuming the system clock underlying Object.wait(long) is accurate).

Fixed-delay execution is appropriate for recurring activities that require "smoothness." In other words, it is appropriate for activities where it is more important to keep the frequency accurate in the short run than in the long run. This includes most animation tasks, such as blinking a cursor at regular intervals. It also includes tasks wherein regular activity is performed in response to human input, such as automatically repeating a character as long as a key is held down.

Parameters:: task - task to be scheduled.; delay - delay in milliseconds before task is to be executed.; period - time in milliseconds between successive task executions.
Throws:: IllegalArgumentException - if delay is negative, or delay + System.currentTimeMillis() is negative.; IllegalStateException - if task was already scheduled or cancelled, timer was cancelled, or timer thread terminated.

说明�Q�该�Ҏ��会在指定的�g时后执行��d��Q��ƈ且在讑֮�的周期定时执行�Q务�?BR>

schedule

public void schedule(TimerTask task,
                     Date firstTime,
                     long period)

Schedules the specified task for repeated fixed-delay execution, beginning at the specified time. Subsequent executions take place at approximately regular intervals, separated by the specified period.

Parameters:: task - task to be scheduled.; firstTime - First time at which task is to be executed.; period - time in milliseconds between successive task executions.
Throws:: IllegalArgumentException - if time.getTime() is negative.; IllegalStateException - if task was already scheduled or cancelled, timer was cancelled, or timer thread terminated.

说明�Q�该�Ҏ��会在指定的时间点执行��d��Q�然后从该时间点开始，在设定的周期定时执行��d��。特别的�Q�如果设定的旉��点在当前旉��之前�Q��Q务会被马上执行，然后开始按照设定的周期定时执行��d��?BR>

scheduleAtFixedRate

public void scheduleAtFixedRate(TimerTask task,
                                long delay,
                                long period)

Schedules the specified task for repeated fixed-rate execution, beginning after the specified delay. Subsequent executions take place at approximately regular intervals, separated by the specified period.

In fixed-rate execution, each execution is scheduled relative to the scheduled execution time of the initial execution. If an execution is delayed for any reason (such as garbage collection or other background activity), two or more executions will occur in rapid succession to "catch up." In the long run, the frequency of execution will be exactly the reciprocal of the specified period (assuming the system clock underlying Object.wait(long) is accurate).

Fixed-rate execution is appropriate for recurring activities that are sensitive to absolute time, such as ringing a chime every hour on the hour, or running scheduled maintenance every day at a particular time. It is also appropriate for recurring activities where the total time to perform a fixed number of executions is important, such as a countdown timer that ticks once every second for ten seconds. Finally, fixed-rate execution is appropriate for scheduling multiple repeating timer tasks that must remain synchronized with respect to one another.

Parameters:: task - task to be scheduled.; delay - delay in milliseconds before task is to be executed.; period - time in milliseconds between successive task executions.
Throws:: IllegalArgumentException - if delay is negative, or delay + System.currentTimeMillis() is negative.; IllegalStateException - if task was already scheduled or cancelled, timer was cancelled, or timer thread terminated.

说明�Q�该�Ҏ��和schedule的相同参数的版本�c�M��Q�不同的是，如果该�Q务因为某些原因（例如垃圾攉��Q�而�g�q�执行，那么接下来的��d��会尽可能的快速执行，以赶上特定的旉��炏V�?BR>

scheduleAtFixedRate

public void scheduleAtFixedRate(TimerTask task,
                                Date firstTime,
                                long period)

Schedules the specified task for repeated fixed-rate execution, beginning at the specified time. Subsequent executions take place at approximately regular intervals, separated by the specified period.

Parameters:: task - task to be scheduled.; firstTime - First time at which task is to be executed.; period - time in milliseconds between successive task executions.
Throws:: IllegalArgumentException - if time.getTime() is negative.; IllegalStateException - if task was already scheduled or cancelled, timer was cancelled, or timer thread terminated.

说明�Q�和上一个方法类伹{�?BR>
下面是我的一个测试片断：

  public static void main(String[] args) throws Exception {
    Timer timer = new Timer(false);
    timer.schedule(new Worker(), new Date(System.currentTimeMillis() + 1000));
  }

��米 2005-06-09 10:29 发表评论

��米 — Thu, 02 Jun 2005 08:30:00 GMT

摘要: 利用JavaMail的API可以快速的实现发送邮件的功能。下面是我��用的一个简单的实例�Q�实��C��单的文本邮�g的发送�? import java.io.*;import java.util.*;import javax.activation.*;import javax.mail.*;... 阅读全文

��米 2005-06-02 16:30 发表评论

��米 — Wed, 25 May 2005 09:00:00 GMT

以前在写�E�序的时候，��到需要比较两个有可能为null的实例时�Q��ؓ了避免出现NullPointerException�Q�经常用�q�样的一�D�代码来比较�Q?BR>

    Object obj1 = "abc";
    Object obj2 = "cde";

    if ((obj1 == null && obj2 == null) || (obj1 != null && obj1.equals(obj2))
        || (obj2 != null && obj2.equals(obj1))) {
      System.out.println("equals");
    }

�q�样的程序，读�v来真是挺拗口。我一直没有想��C��么好的方法解册��个问题，直到今天在看到JDK的AbstractList源码的equals�Ҏ��的实现时�Q�看到这一�D�：

if (!(o1==null ? o2==null : o1.equals(o2)))
return false;

原来用三元运��符可以很好的解册��个问题，呵呵�Q�我前面的程序可以改写成�Q?BR>

    Object obj1 = "abc";
    Object obj2 = "cde";

    if (obj1 == null ? obj2 == null : obj1.equals(obj2))
      System.out.println("equals");

真是��z�多了！

��米 2005-05-25 17:00 发表评论

��米 — Wed, 25 May 2005 07:02:00 GMT

      从对象池中获取的实例�Q�因为�ƈ不清楚该channel是否已经讄��成正��的状态，所以在使用时最好重新设�|�一遍。有以下几点需要注意：
      1.在��用阻塞IO�Ӟ��需要把该channel讄��成阻塞的�Q�即需要调用SocketChannel.configureBlocking(true);
      2.在��用非��d��IO�Ӟ��需要把该channel讄��成非��d��的，即需要调用SocketChannel.configureBlocking(false);
      3.如果该channel注册了selector�Q�那么在�q�回该实例到对象池中�Q�需要把注册的selector清除�Q�即需要调用Selector的close�Ҏ��?BR>
      下面是一�D�应用场景的例子�Q?BR>

        // 把命令输�?/SPAN>
        channel.configureBlocking(true);
        PrintWriter writer = new PrintWriter(channel.socket().getOutputStream(), false);
        writer.write(command.endsWith("\n") ? command : command + "\n");
        writer.flush();

        channel.configureBlocking(false);

        // 创徏Selector
        Selector selector = Selector.open();
        // 向Selector注册我们需要的READ事�g
        SelectionKey skey = channel.register(selector, SelectionKey.OP_READ);

        boolean stop = false;
        int n = 0;
        int read = 0;
        ByteBuffer buffer = ByteBuffer.allocate(1024);

        // 轮询
        while (!stop) {
          // 获取Selector�q�回的时间�?/SPAN>
          n = selector.select();

          // 当传回的值大�?事，��M��件发生了
          if (n > 0) {
         // 处理发生的事�?/SPAN>

          }
        }

        selector.close();

��米 2005-05-25 15:02 发表评论

��米 — Tue, 24 May 2005 09:47:00 GMT

在JDK1.3版本中引入了Dynamic Proxy的代理机�Ӟ��通过实现java.lang.reflect.InvocationHandler接口�Q�可以实现拦截需要改写的�Ҏ��。下面是一个简单范例�?BR> 有下面一个接口TestInterface和它的一个实现TestImpl�Q?BR>

package sample.proxy;

/**
*

Title:

*
*

Description:

*
*

Company:

*
* @author George Hill
* @version 1.0
*/

public interface TestInterface {

public String print();

}

package sample.proxy;

/**
*

Title:

*
*

Description:

*
*

Company:

*
* @author George Hill
* @version 1.0
*/

public class TestImpl implements TestInterface {

  public String print() {
    return "Hello, it's from TestImpl class";
  }

}

下面拦截print�Ҏ��Q�调用自��q��实现�Q�这需要实现java.lang.reflect.InvocationHandler接口�?BR>

package sample.proxy;

import java.lang.reflect.*;

/**
*

Title:

*
*

Description:

*
*

Company:

*
* @author George Hill
* @version 1.0
*/

public class TestHandler implements InvocationHandler {

  TestInterface test;

  /**
   * ��动态代理绑定到指定的TestInterface
   * @param test TestInterface
   * @return TestInterface �l�定代理后的TestInterface
   */
  public TestInterface bind(TestInterface test) {
    this.test = test;

    TestInterface proxyTest = (TestInterface) Proxy.newProxyInstance(
      test.getClass().getClassLoader(), test.getClass().getInterfaces(), this);

    return proxyTest;
  }

  /**
   * �Ҏ��调用拦截器，拦截print�Ҏ��
   * @param proxy Object
   * @param method Method
   * @param args Object[]
   * @return Object
   * @throws Throwable
   */
  public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
    // 如果调用的是print�Ҏ��Q�则替换�?/SPAN>
    if ("print".equals(method.getName())) {
      return "HaHa, It's come from TestHandler";
    } else {
      return method.invoke(this.test, args);
    }
  }

}

下面是测试用例：

package sample.test;

import junit.framework.*;

import sample.proxy.*;

/**
*

Title:

*
*

Description:

*
*

Company:

*
* @author George Hill
* @version 1.0
*/

public class TestDynamicProxy extends TestCase {

  private TestInterface test = null;

  protected void setUp() throws Exception {
    super.setUp();
    TestHandler handler = new TestHandler();
    // 用handler�ȝ��成实�?/SPAN>
    test = handler.bind(new TestImpl());
  }

  protected void tearDown() throws Exception {
    test = null;
    super.tearDown();
  }

  public void testPrint() {
    System.out.println(test.print());
  }

}

�q�行��试用例�Q�可以看到输出的是“HaHa, It's come from TestHandler”�?img src ="http://www.aygfsteel.com/georgehill/aggbug/5126.html" width = "1" height = "1" />

��米 2005-05-24 17:47 发表评论

��米 — Fri, 20 May 2005 06:08:00 GMT

摘要: 使用Jakarta Commons Pool可以�Ҏ��需要快速的实现自己的对象池�Q�只需要实现PoolableObjectFactory或者KeyedPoolableObjectFactory接口。KeyedPoolableObjectFactory和PoolableObjectFactory的不同之处在于KeyedPoolabl... 阅读全文

��米 2005-05-20 14:08 发表评论

用NIO实现的简单的�|�络服务器端

��米 — Wed, 18 May 2005 04:21:00 GMT

下面是我的一个简单的�|�络服务器端的程序，�E�序的流�E�是监听ACCEPT事�g�Q�然后往客户端输��Z��串字�W�串。是不是很简单�?IMG height=19 src="http://www.aygfsteel.com/Emoticons/teeth_smile.gif" width=19 border=0>

package sample.nio;

import java.io.*;
import java.net.*;
import java.nio.channels.*;
import java.util.*;

/**
*

Title:

*
*

Description:

*
*

Company:

*
* @author George Hill
* @version 1.0
*/

public class Server {

  private int port;

  public Server(int port) {
    this.port = port;
  }

  public void startServer() throws IOException {
    // 创徏ServerSocketChannel�q�且�l�定到指定的端口
    ServerSocketChannel ssc = ServerSocketChannel.open();
    InetSocketAddress address = new InetSocketAddress(InetAddress.getLocalHost(), port);
    ssc.socket().bind(address);
    ssc.configureBlocking(false);

    // 创徏Selector�Q��ƈ且注册ACCEPT事�g
    Selector selector = Selector.open();
    SelectionKey skey = ssc.register(selector, SelectionKey.OP_ACCEPT);

    boolean stop = false;
    int n = 0;

    System.out.println("Server Start");

    // 轮询
    while (!stop) {
      // 获取Selector�q�回的时间�?/SPAN>
      n = selector.select();

      // 当传回的值大�?事，��L��间发生了
      if (n > 0) {
        Set set = selector.selectedKeys();
        Iterator it = set.iterator();

        while (it.hasNext()) {
          skey = (SelectionKey) it.next();
          it.remove();

          if (skey.isAcceptable()) {
            // 从channel()中取得刚刚注册的Channel
            Socket socket = ((ServerSocketChannel) skey.channel()).accept().socket();

            PrintWriter writer = new PrintWriter(socket.getOutputStream(), true);

            // ��?Hello, World"写入
            writer.write("Hello, World!\n");

            // 睡眠3�U?/SPAN>
            try {
              Thread.sleep(3000);
            } catch (InterruptedException ie) {
            }

            // ��?EXIT"写入Buffer
            writer.write("EXIT");

            // 退出程�?/SPAN>
            writer.close();
            // stop = true;
          }
        }
      }
    }

    ssc.close();
    System.out.println("Server Stop");
  }

  public static void main(String[] args) throws Exception {
    Server server = new Server(5000);
    server.startServer();
  }
}

��米 2005-05-18 12:21 发表评论

用NIO实现的两�U�网�l�程序客��L��

��米 — Wed, 18 May 2005 04:18:00 GMT

摘要: 最�q�在做有关Socket的程序，写了两个客户端程序，�W�一个客��L��E�序如下�Q? 1package sample.nio; 2 3import java.io.IOException; 4import java.net.*; 5import&nb... 阅读全文

��米 2005-05-18 12:18 发表评论

如何使用JCE的DES�q�行加密解密

��米 — Wed, 18 May 2005 03:55:00 GMT

从JDK1.4开始，SUN提供了JCE包，可以实现多种加密��法。下面是我的一个用JCE�q�行DES加密解密的程序：

package sample;

import java.security.*;
import javax.crypto.*;

/**
*

Title:

*
*

Description:

*
*

Company:

*
* @author George Hill
* @version 1.0
*/

public class Test {

  // 加密使用的Key
  private SecretKey key;

  // 加密��法�Q�JCE可用DES,DESede和Blowfish
  private static final String algorithm = "DES";

  public Test() throws NoSuchAlgorithmException {
    KeyGenerator generator = KeyGenerator.getInstance(algorithm);
    key = generator.generateKey();
  }

  /**
   * 利用DES��法加密
   * @param s String 需要加密的字符�?BR>   * @return String 加密后的字符�?BR>   * @throws Exception
   */
  public String encryptData(String s) throws Exception {
    Cipher c = Cipher.getInstance(algorithm);
    c.init(Cipher.ENCRYPT_MODE, key);

    return new String(c.doFinal(s.getBytes()));
  }

  /**
   * 利用DES��法解密
   * @param s String 需要解密的字符�?BR>   * @return String 解密后的字符�?BR>   * @throws Exception
   */
  public String decryptData(String s) throws Exception {
    Cipher c = Cipher.getInstance(algorithm);
    c.init(Cipher.DECRYPT_MODE, key);

    return new String(c.doFinal(s.getBytes()));
  }

  /**
   * ��试�E�序
   * @param args String[]
   * @throws Exception
   */
  public static void main(String[] args) throws Exception {
    String s = "Hello";
    Test test = new Test();
    String encrypt = test.encryptData(s);
    System.out.println(encrypt);
    String decrypt = test.decryptData(encrypt);
    System.out.println(decrypt);
  }
}

在实际的使用中，往往需要对加密后的byte数组�q�行转换�Q�可以自己实现�{换，或者用一些第三方的API�?img src ="http://www.aygfsteel.com/georgehill/aggbug/4485.html" width = "1" height = "1" />

��米 2005-05-18 11:55 发表评论

��米 — Mon, 16 May 2005 06:04:00 GMT

在JBuilder X中编辑XML文�g�Ӟ��每做修改都要停顿很长的时��_��可能是在��查XML的格式是否正��。例如我在编辑Struts的有效性校验文件validation.xml文�g�Ӟ��常常写一��段内容都要五六分钟的时候。��我无法忍受，不得不用其它的��Y件编辑，例如UltraEdit。现�?005中已�l�没有这个问题。我感觉2005在编辑Struts的内�Ҏ��Q�速度都比以前的版本要快�?img src ="http://www.aygfsteel.com/georgehill/aggbug/4334.html" width = "1" height = "1" />

��米 2005-05-16 14:04 发表评论

��米 — Thu, 12 May 2005 07:33:00 GMT

摘要: 在网��늼��E�中�Q�经帔R��要��用到附加码这��L��一个东西，防止黑客用程序用�I��D法去破解密码。下面是我的一个附加码的Servlet实现�? 1import java.awt.*; 2import java.awt.image.*; 3import... 阅读全文

��米 2005-05-12 15:33 发表评论

如何在JBuilder2005中新增Server

��米 — Thu, 12 May 2005 03:56:00 GMT

最�q�把自己的IDE从JBuilderX升��C��2005�Q�虽然在�~�辑Struts的配�|�文件的时候感觉快了些�Q�但是��M��q�是很吃机器。以前的一些项目都是跑在Tomcat 4.0.6的环境下的，�?005中却没有了Tomcat 4.0的Server。�ؓ了让开发环境和�q�行环境一��_��我决定给2005加上Tomcat 4.0的Server。经�q�一天的摸烦�Q�终于成功�?BR> 一开始我以�ؓ用Configure Servers里面的Copy功能�Q�把Tomcat 4.1的拷贝成4.0的就可以了，但是Tomcat跑不��h��Q�因�?.1�?.0的server.xml文�g的格式是不一��L��Q�在4.1中的server.xml文�g格式如下�Q?/P>

1xml version="1.0" encoding="UTF-8"?>
2
3<Server debug="0" port="8081" shutdown="SHUTDOWN">
4  <Service name="Tomcat-Standalone">
5    <Connector acceptCount="10" className="org.apache.coyote.tomcat4.CoyoteConnector" connectionTimeout="60000" debug="0" maxProcessors="75" minProcessors="5" port="8080" useURIValidationHack="false"/>
6    <Engine debug="0" defaultHost="localhost" name="Standalone">
7      <Host appBase="D:\jbproject\xxxxx\Tomcat\webapps" debug="0" name="localhost" unpackWARs="true"/>
8    Engine>
9  Service>
10Server>

�?.0中的server.xml文�g格式如下�Q?/P>

1xml version="1.0" encoding="UTF-8"?>
2
3<Server debug="0" port="8081" shutdown="SHUTDOWN">
4  <Service name="Tomcat-Standalone">
5    <Connector acceptCount="10" className="org.apache.catalina.connector.http.HttpConnector" connectionTimeout="60000" debug="0" maxProcessors="75" minProcessors="5" port="8080"/>
6    <Engine debug="0" defaultHost="localhost" name="Standalone">
7      <Host appBase="D:\jbproject\xxxxx\Tomcat\webapps" debug="0" name="localhost" unpackWARs="true">
8        <Context debug="0" docBase="D:\jbproject\xxxxx\admin" path="/admin" reloadable="true" workDir="D:\jbproject\xxxxx\Tomcat\work\admin"/>
9      Host>
10    Engine>
11  Service>
12Server>
13

�?.1中把具体的Context攑ֈ�了webapps目录下面�Q�所以�ƈ不能��单的copy�q�来��可以用�?BR>
在JBuilder 2005中，每个Server都是以plugin的�Ş式加入的�Q�具体的jar文�g攑֜�lib目录下面的servers目录里面。用WinRAR打开tomcat-jbsp.jar文�g�Q�可以看到里面有Tomcat33*.class和Tomcat40*.class�Q�也��是说其实JBuilder 2005其实是有�q�些server的配�|�信息的�Q�只是它隐藏了。那么怎么把它打开呢？�{�案��在MANIFEST.MF文�g里面�Q�修改前的文件内容如下：

1Implementation-Vendor: Borland Software Corp.
2Implementation-Version: 011.000.236.000
3Implementation-Title: JBuilder 2005, English Edition
4OpenTools-Servers: com.borland.jbuilder.server.tomcat.Tomcat50Server
5 com.borland.jbuilder.server.tomcat.Tomcat41Server
6

在后面再增加一行：com.borland.jbuilder.server.tomcat.Tomcat40Server。保存，�q�且重启JBuilder 2005�Q�点击Enterprise->Configure Servers�Q�你��可以看到里面多了一个Tomcat4.0的Server。呵呵，大功告成�Q?BR>
�c�M��的还可以��d��其它的Server�Q�不�q�只限于JBuilder 2005本��n有的Server。如果熟悉JBuilder 的plugin的大虑֮�全可以自��q��E�解冟�?BR>

��米 2005-05-12 11:56 发表评论

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由JComponent生成BufferedImage

如何���BufferedImage实例保存为BMP文�g

关闭JBuilder2005的Smart MemberInsight功能

用java.util.Timer定时执行��d��

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用NIO实现的简单的�|�络服务器端

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如何在JBuilder2005中新增Server

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