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诗语江南 — Wed, 12 Dec 2007 05:19:00 GMT

一,做一个最��单的Applet:

1,�~�译JAVA�c�：(x��)

{TOMCAT_HOME} = D:\tomcat6

假设�?/span>D:\tomcat6\webapps\testweb\test目录中新�?/span>hello目录�Q�在hello目录中新�?/span>java�c?/span>HelloWorld.java:

package hello;

import java.awt.*;

import java.applet.*;

//必须�l�承Appelet�c?/span>

public class HelloWorld extends Applet {

public void paint(Graphics g )

{

//向外输出的字�W�串

g.drawString("Hello HelloWorldd!",5,35);

}

�?/span>CMD命��o(h��)行中�~�译该类:

C:\Documents and Settings\Administrator>d:

D:>cd D:\tomcat6\webapps\testweb\test

D:>javac hello\HelloWorld.java

2�Q�在�|�页中嵌�?/span>Applet:

�?/span>D:\tomcat6\webapps\testweb\test目录中新�?/span>testHello.html文�g�Q?/span>

HelloWorld! Applet

codebase="."

CODE="hello.HelloWorld.class"

name="HelloWorld"

WIDTH=200

HEIGHT=100

ALIGN = middle

3�Q�运行查�?/span>Applet:

appletviewer是一个专门用来运行查�?/span>applet的工��P��直接在命令行上敲打就可以

�?/span>CMD命��o(h��)行中

>d:

>cd D:\tomcat6\webapps\testweb\test

>appletviewer testHello.html

如果启动�?/span>TOMCAT�Q�也可以在浏览器中浏览，不过有些��览器不支持�Q�需�?/span>JAVA插�g才可以看到效果，比如遨游�Q�我是在IE6.0中运行可以看到�?/span>

二，Applet�q�一步处理：(x��)

如果��x��|�页中的Applet标签转换�?/span>或�?/span>形式�Q�需要做以下工作�Q?/span>

4�Q�将hello目录打包�Q?/span>

>d:

>cd D:\tomcat6\webapps\testweb\test

>jar -cvf hello.jar ./hello

5,使用htmlconverter工具来�{换：(x��)

1)下蝲htmlconverter==>http://java.sun.com/products/plugin/1.3/docs/html_converter.html

2)下蝲后是一个压�~�文�Ӟ��解压�~�后成�ؓ(f��)一�?/span>jar包，假设�?/span>jar包在D:\tomcat6\webapps\testweb\test�?/span>

>d:

>cd D:\tomcat6\webapps\testweb\test

>java -jar htmlconv1_3.jar helloworld.jsp (注：(x��)不清�?/span>htmlconverter怎么用的�Q�可以敲命��o(h��)查看帮助�Q?/span>java -jar htmlconv1_3.jar -help)

此时helloworld.jsp中的代码��被转换成如下样式：(x��)

HelloWorld! Applet

19F9331-3110-11d4-991C-005004D3B3DB"

WIDTH = 200 HEIGHT = 100 NAME = "HelloWorld" ALIGN = middle codebase="http://java.sun.com/products/plugin/1.3.0_02/jinstall-130_02-win32.cab#Version=1,3,0,2">

1.3.0_02">

1.3.0_02" CODE = "hello.HelloWorld.class" CODEBASE = "." ARCHIVE = "HelloWorld.jar" NAME = "HelloWorld" WIDTH = 200 HEIGHT = 100 ALIGN = middle scriptable=false pluginspage="http://java.sun.com/products/plugin/1.3.0_02/plugin-install.html">

�q�样转换��已�l�完成，此时再用appletviewer��L��看，效果和前面一�?/span>

诗语江南 2007-12-12 13:19 发表评论

诗语江南 — Sun, 14 Oct 2007 14:16:00 GMT

本文转自BeanSoft: http://m.tkk7.com/beansoft/archive/2007/10/09/151368.html

常见�?Tomcat 5 表单�~�码提交后�ؕ码的解决�Ҏ(gu��)��有很�? 有改 Tomcat Connector 属性的, 有加�q��o(h��)器的. 但是 Tomcat 自带的那个过滤器只解决了 POST 方式的�ؕ码却不能处理 GET 方式的�ؕ�? 在这里那我就�l�出一个不需要修改�Q�?Tomcat 配置文�g的完��解决中文问题的�q��o(h��)器的代码:

首先是我们的��试��面:

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
    "-//W3C//DTD HTML 4.01 Transitional//EN">
    
    
    表单���试��面
    
    
    "action.jsp">
    GET 方式: "name" value="GET 中文">
    
    
    "action.jsp" method="POST">
    POST 方式: "name" value="POST 中文">

和普通的表单没有��M��区别.

然后��是表单提交��面 action.jsp:

<%@ page language="java" pageEncoding="GBK"%>
    
    
    参数: <%=request.getParameter("name") %>

接着是过滤器的配�|�文�?web.xml (�?2.5 版本也可�?:

xml version="1.0" encoding="UTF-8"?>
    <web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <filter>
    <filter-name>TomcatFormFilterfilter-name>
    <filter-class>filters.TomcatFormFilterfilter-class>
    filter>
    <filter-mapping>
    <filter-name>TomcatFormFilterfilter-name>
    <url-pattern>*.jspurl-pattern>
    filter-mapping>
    <welcome-file-list>
    <welcome-file>index.jspwelcome-file>
    welcome-file-list>
    web-app>

最后最关键的就是我们的�q��o(h��)器代码了, �?GET 方式使用��h��包装�? �?POST 方式则用 setCharacterEncoding():

package filters;
    import java.io.IOException;
    import javax.servlet.Filter;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import javax.servlet.ServletException;
    import  javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletRequestWrapper;
    import javax.servlet.http.HttpServletResponse;
    public class TomcatFormFilter implements Filter {
    /**
          * Request.java
          * �?HttpServletRequestWrapper �q�行扩充, 不媄(ji��ng)响原来的功能�q�能提供所有的 HttpServletRequest
          * 接口中的功能. 它可以统一的对 Tomcat 默认讄���下的中文问题�q�行解决而只需要用新的 Request 对象替换��面中的
          * request 对象卛_��.
          */
    class Request extends HttpServletRequestWrapper
    {
    public Request(HttpServletRequest request) {
    super(request);
    }
    /**
             * 转换��p��单读取的数据的内�?
             * �?ISO 字符转到 GBK.
             */
    public String toChi(String input) {
    try {
    byte[] bytes = input.getBytes("ISO8859-1");
    return new String(bytes, "GBK");
    }
    catch (Exception ex) {
    }
    return null;
    }
    /**
             * Return the HttpServletRequest holded by this object.
             */
    private HttpServletRequest getHttpServletRequest()
    {
    return (HttpServletRequest)super.getRequest();
    }
    /**
             * ��d��参数 -- 修正了中文问�?
             */
    public String getParameter(String name)
    {
    return toChi(getHttpServletRequest().getParameter(name));
    }
    /**
             * ��d��参数列表 - 修正了中文问�?
             */
    public String[] getParameterValues(String name)
    {
    String values[] = getHttpServletRequest().getParameterValues(name);
    if (values != null) {
    for (int i = 0; i < values.length; i++) {
    values[i] = toChi(values[i]);
    }
    }
    return values;
    }
    }
    public void destroy() {
    }
    public void doFilter(ServletRequest request, ServletResponse response,
    FilterChain chain) throws IOException, ServletException {
    HttpServletRequest httpreq = (HttpServletRequest)request;
    if(httpreq.getMethod().equals("POST")) {
    request.setCharacterEncoding("GBK");
    } else {
    request = new Request(httpreq);
    }
    chain.doFilter(request, response);
    }
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    }

怎么�? 是不是很��单也很方便呢?

诗语江南 2007-10-14 22:16 发表评论

�l�计字符串中的重复部分�ƈ整理输出

诗语江南 — Fri, 05 Oct 2007 05:36:00 GMT

import java.util.*;
/*
* @author 诗语江南
* @function �l�计字符串中的重复部分�ƈ整理输出,
*      我用了两�U�方法来�?
*/
public class StrShowTimes{
public static void main(String[] r){
  String str = "帅哥,��女,帅哥,野兽,��女,帅哥";

  Map s1 = strTimesWithMap(str);
  Set keys = s1.keySet();
  Iterator it = keys.iterator();
  while(it.hasNext()){
   String key = (String)it.next();
   int value = (Integer) s1.get(key);
   System.out.print(key + ": " + value+ ", ");
  }
  System.out.println();

  strTimesWithArray(str);
}

//使用HashMap的方�?该方法比较简�?br /> public static Map strTimesWithMap(String str){
  //key: 子字�W�串 String , value: 重复�ơ数 Integer
  Map strMap = new HashMap();
  String[] strArr = str.split(",");
  for(int i =0; i< strArr.length ; i++){
   String key = strArr[i] ;
   if(strMap.containsKey(key)){
    int value = (Integer) strMap.get(key);
    strMap.put(key,++value);
   }else{
    strMap.put(key,1);
   }
  }
  return strMap;
}

//使用双数�l�的�Ҏ(gu��)��,一个字�W�串数组存字�W�串
//一个整形数�l�存与字�W�串数组对应位置上的字符串出现的�ơ数
public static void strTimesWithArray(String str){
  String[] tempArr = str.split(",");
  int i , end = 0 , len = tempArr.length;
  String[] strArr = new String[len];
  int[] intArr = new int[len];
  boolean isChange ;
  for(i = 0 ; i < len ; i++){
   isChange = false;
   for(int j = 0 ; j < end ; j++){
    if(tempArr[i].equals(strArr[j])){
     intArr[j] = intArr[j] +1 ;
     isChange = true;
     break;
    }
   }
   if(isChange) continue;
   strArr[end] = tempArr[i];
   intArr[end++] = 1;
  }
  for(i = 0 ; i < end ; i++){
   System.out.print(strArr[i] + ": " + intArr[i] + " ");
  }
}

}

诗语江南 2007-10-05 13:36 发表评论

冒��排序

诗语江南 — Thu, 27 Sep 2007 16:14:00 GMT

package sort;
import java.io.*;
import java.util.*;
/*
* @author NoGodMe
* @function 使用冒��法排�?br /> */
public class SortBubble {

public static void main(String[] args) throws IOException {
  SortBubble mp = new SortBubble();
  int[] intBeforeSort = mp.getIntData();
  int[] intAfterSort = mp.sortWithBubble(intBeforeSort);
  for(int i:intAfterSort){
   System.out.println(i);
  }
}

//获取从命令行输入的N个数�?�?1作�ؓ(f��)�l�束标志,�q�且-1不计��在�?br /> public int[] getIntData() throws IOException{
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  List intList = new ArrayList();
  String temp = null;
  while( (temp = br.readLine()) != null ){
   if(temp.length() == 0) continue;
   int i = Integer.parseInt(temp.trim());
   if(i == -1) break;
   intList.add(i);
  }

  int[] intArr = new int[intList.size()];
  int count = 0;
  for(Integer i:intList){
   intArr[count++] = i.intValue();
  }

  return intArr;
}

//冒��排序�?br /> public int[] sortWithBubble(int[] data){
  int temp;
  boolean isChange = false;
  for(int i = 0 ; i < data.length - 1 ; i++){
   isChange = false;
   for(int j = 0 ; j < data.length - 1; j++){
    if(data[j] > data[j + 1]){
     temp = data[j];
     data[j] = data[j + 1];
     data[j + 1] = temp;
     isChange = true;
    }
   }
   if(!isChange) break;
  }
  return data;
}

}

诗语江南 2007-09-28 00:14 发表评论

诗语江南 — Mon, 17 Sep 2007 16:44:00 GMT

摘要: 0�?需要标识符
a) 不在函数�?
1�?非法表达式开�?
b) 可能:丢失括号 .
2. no data found
a) 可能:setInt(1,100)�?没有100�q�个�?
3. 找不到符�?
a) 可能:没导入包
4. 指定了无效URL
a) 可能:数据库名或IP错误,卌��接出�?
阅读全文

诗语江南 2007-09-18 00:44 发表评论