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YeeYang — Mon, 25 May 2009 02:32:00 GMT

1 import javax.swing.text.AttributeSet;
2 import javax.swing.text.BadLocationException;
3 import javax.swing.text.PlainDocument;
4
5 public class LimitedDocument extends PlainDocument {
6
7     private int maxLength = -1;
8     private String allowCharAsString = null;
9
10     public LimitedDocument() {
11         super();
12     }
13
14     public LimitedDocument(int maxLength, String str) {
15         super();
16         this.maxLength = maxLength;
17         allowCharAsString = str;
18     }
19
20     @Override
21     public void insertString(int offset, String str, AttributeSet attrSet)
22             throws BadLocationException {
23
24         if (str == null) {
25             return;
26         }
27
28         if (allowCharAsString != null && str.length() == 1) {
29             if (allowCharAsString.indexOf(str) == -1) {
30                 return;
31             }
32         }
33
34         char[] charVal = str.toCharArray();
35         String strOldValue = getText(0, getLength());
36         byte[] tmp = strOldValue.getBytes();
37
38         if (maxLength != -1 && (tmp.length + charVal.length > maxLength)) {
39             return;
40         }
41
42         super.insertString(offset, str, attrSet);
43     }
44 }

用法�Q?br />

1 LimitedDocument Input = new LimitedDocument(maxLength,allowCharAsString);
2 maxLength 为最大输入长度，allowCharAsString 为允许输入的字符
3 jTextField.setDocument(Input); �q�用到文本框�?/span>

例如�Q?br />

1 String AllowChar = "0123456789";
2 LimitedDocument Input = new LimitedDocument(11,AllowChar)

YeeYang 2009-05-25 10:32 发表评论

YeeYang — Sun, 24 May 2009 03:18:00 GMT

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

public class DESPlus {
private static String strDefaultKey = "national";
private Cipher encryptCipher = null;
private Cipher decryptCipher = null;

/**
* ��byte数组转换��C?6�q�制值的字符�Ԍ�� 如：(x��)byte[]{8,18}转换为：(x��)0813�Q?和public static byte[]
* hexStr2ByteArr(String strIn) 互�ؓ(f��)可逆的转换�q�程
*
* @param arrB
* 需要�{换的byte数组
* @return 转换后的字符�?
* @throws Exception
* 本方法不处理��M��异常阅读全文

YeeYang 2009-05-24 11:18 发表评论

YeeYang — Sat, 23 May 2009 02:27:00 GMT

1 import java.security.MessageDigest;
2 import java.security.*;
3 import java.security.spec.*;
4
5 /*
6  * To change this template, choose Tools | Templates
7  * and open the template in the editor.
8  */
9 /**
10  *
11  * @author Administrator
12  */
13 public class MD5 {
14     public final static String MD5(String s) {
15         char hexDigits[] = {
16             '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
17             'e', 'f'
18         };
19         try {
20             byte[] strTemp = s.getBytes();
21             MessageDigest mdTemp = MessageDigest.getInstance("MD5");
22             mdTemp.update(strTemp);
23             byte[] md = mdTemp.digest();
24             int j = md.length;
25             char str[] = new char[j * 2];
26             int k = 0;
27             for (int i = 0; i < j; i++) {
28                 byte byte0 = md[i];
29                 str[k++] = hexDigits[byte0 >>> 4 & 0xf];
30                 str[k++] = hexDigits[byte0 & 0xf];
31             }
32             return new String(str);
33         } catch (Exception e) {
34             return null;
35         }
36     }
37 }
38

YeeYang 2009-05-23 10:27 发表评论

YeeYang — Fri, 22 May 2009 02:35:00 GMT

下面��是在jFrame下的一些方法经验积累，可能很微��很不�v��|��或许�Ҏ(gu��)��手有点点帮助�Q�我�?x��)不定时更新一下的�Q?br />
1�Q�改变界面�ؓ(f��)�pȝ��默认状态：(x��)

1     //需要导入这个包
2     import javax.swing.UIManager;
3
4     //改变界面为系�l�默认状�?nbsp;
5
6     try {
7
8         UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); //讄��界面样式
9
10         javax.swing.SwingUtilities.updateComponentTreeUI(this); //更新界面
11
12     } catch (Exception ex) { //捕捉错误
13
14         ex.printStackTrace(); //输出错误
15
16     }

2�Q�取消窗口的最大化�Q?br />

1 setResizable(false); //取消最大化

3�Q�窗口居中显�C�：(x��)

1 setLocationRelativeTo(null); //居中昄��

4�Q�取消标题栏昄��Q?br />

1 setUndecorated(true); //取消标题栏显�C?/span>

注意�Q�这个方法是从jdk1.4版本以后增加的，以前版本是没有的�Q�这个方法必��d��jFrame昄��之前调用�Q�显�C�Z��后调用，�?x��)出错�?br />

YeeYang 2009-05-22 10:35 发表评论

JAVA�Q�获取本机外�|�IP地址的小工具

YeeYang — Tue, 19 May 2009 15:35:00 GMT

本�h的思�\是让�E�序去访问（HttpURLConnection�Q�一个可以查IP地址的，然后把这个网��下载（F(tu��n)ileOutputStream�Q�到本地�Q�通过�Q�BufferedReader�Q�去��d��那个临时文�g�Q�最后通过操作文�g�Q�F(tu��n)ile�Q�，把��(f��)时文件删除，�q�以弹出“对话�?#8221;形式把获取的“外网IP”昄��出来�?br />
提供几个查IP反回��面相对��单的�|�址�Q�访问不同的�|�址�Q�读取关键字�W�串的时候可能会(x��)不同�Q�请做出相应的修攏V�?br />

http://www.bliao.com/ip.phtml
http://www.5di1.com/getip/getip.asp
http://www.m5home.com/myip
http://vbnet.mvps.org/resources/tools/getpublicip.shtml

下面是程序的源码�Q�可以参考一下：(x��)

  1 import java.io.File;
  2 import java.io.FileReader;
  3 import java.io.BufferedReader;
  4 import java.io.FileOutputStream;
  5 import java.io.IOException;
  6 import java.io.InputStream;
  7 import java.net.HttpURLConnection;
  8 import java.net.MalformedURLException;
  9 import java.net.URL;
10 import javax.swing.JOptionPane;
11
12 /**
13  * GetPublicIP �c?br /> 14  *
15  * @author YeeYang
16  *
17  * @version 1.0
18  *
19  */
20 public class GetPublicIP {
21
22     /**/
23     /**
24      * �ȝ��序入�?br /> 25      *
26      * @param args
27      *            输入参数数组
28      */
29     public static void main(String[] args) {
30         String pIP = GetPublicIP("http://www.bliao.com/ip.phtml", "IP_Temp.tmp");
31         JOptionPane.showConfirmDialog(null, pIP, "�(zh��n)�的外网IP地址",
32                 JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE);
33     }
34
35     /**/
36     /**
37      * 获取已下载的文�g里的字符�?IP地址)
38      *
39      * @return 获取的外�|�IP地址
40      * @throws Exception
41      */
42     public static String GetPublicIP(String urlStr, String tempSaveStr) {
43
44         // 下蝲操作 - 开�?nbsp;�Q�下载网�l�文件获取相关IP地址�q�保存�(sh��)ؓ(f��)临时文�gIP.shtml
45         int chByte = 0; // ��d��输入��的数据长度
46         URL url = null; // �|�络的url地址
47         HttpURLConnection httpConn = null; // http�q�接
48         InputStream in = null; // 输入��?/span>
49         FileOutputStream out = null; // 文�g输出��?/span>
50         try {
51             url = new URL(urlStr);
52             httpConn = (HttpURLConnection) url.openConnection();
53             HttpURLConnection.setFollowRedirects(true);
54             httpConn.setRequestMethod("GET");
55             httpConn.setRequestProperty("User-Agent",
56                     "Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)");
57
58             in = httpConn.getInputStream();
59             out = new FileOutputStream(new File("tempSaveStr"));
60
61             chByte = in.read();
62             while (chByte != -1) {
63                 out.write(chByte);
64                 // System.out.println(chByte);
65                 chByte = in.read();
66             }
67         } catch (MalformedURLException e) {
68             e.printStackTrace();
69         } catch (IOException e) {
70             e.printStackTrace();
71         } finally {
72             try {
73                 out.close();
74                 in.close();
75                 httpConn.disconnect();
76             } catch (Exception ex) {
77                 ex.printStackTrace();
78             }
79         }
80         // 下蝲操作 - �l�束
81
82         // 获取IP操作 - 开�?nbsp;: 从��(f��)时文件IP.shtml中读取IP地址
83         String IP = null;
84         try {
85             BufferedReader br = new BufferedReader(
86                     new FileReader("tempSaveStr"));
87             IP = br.readLine();
88             br.close();
89         } catch (Exception e) {
90             e.printStackTrace();
91         }
92         // 获取IP操作 - �l�束
93
94         // 删除操作 - 开�?nbsp;�Q�删除��(f��)时文件IP.shtml
95         try {
96             java.io.File myDelFile = new java.io.File("tempSaveStr");
97             myDelFile.delete();
98         } catch (Exception e) {
99             System.out.println("Wrong Del");
100             e.printStackTrace();
101         }
102         // 删除操作 - �l�束
103
104         return IP;
105     }
106 }

对于源码中第55,56两行�Q�我是设�|��ؓ(f��)模拟IE下蝲的，可以通过修改�Q�达到模拟FireFox的目的，代码如下�Q?br />

1 httpConn.setRequestProperty("User-Agent","Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14");

YeeYang 2009-05-19 23:35 发表评论