国际化的东西带来的问题还真的好多，各国语言不同，所使用的字符集都不一样，JAVA，Mysql，Tomcat，浏览器等等用的字符集也不一样，这几天气得我都说了好几次不用什么Struts，Mysql，Tomcat了，全部都是自己写出来好了，用统一的编码统一的字符集，可惜能力不够，说说而已，问题还是得解决。在网上查了好久，自己也实践了好多天，问题终于算是解决了。
因为要考虑到很多国的语言，一开始就把项目立足于国际化，在把连接方式从Struts连接池改为Tomcat的连接池之后，原来我遇到的乱码有
1、资源文件里读出来在页面上的乱码；
2、数据库读出来的乱码
3、数据库写进去的乱码
4、在ActionForm验证不通过Errors返回的乱码，也就是request，IE参数传递的乱码了。
5、有一个JS写的时间选择跳出框，如果在charset=UTF-8的时候就出错，但如果我改为charset=GBK或GB2312时就一切正常了，很奇怪的现象，我还找不出答案来。
哇，好多的乱码。。。。头都大了好几天。
下面是我的解决方法
1、资源文件里读出来在页面上的乱码：这个最容易解决了，把写好的ApplicationResources.properties文件，在DOC底下用 native2ascii -encoding gb2312 ApplicationResources.properties
ApplicationResources_zh_CN.properties 命令来个字符编码转换，将原来的中文转为Unicode编码就搞定了中文简体，繁体也用同样的命令，只是把 bg2312 改为 bgk 就可以了。
2、数据库读写的乱码，刚开始的时候因为受以前的SQL Server+JDBC 影响（在那时写入数据库是可以不用做什么工作的，只是在读出来的时候来个 gbk = new String(iso.getBytes("ISO-8859-1"), "GBK") 转换就行了）我也都在把读写都在转换，搞得好复杂也很麻烦，后来在连接池连接代码jdbc:mysql://localhost:3306/database?autoReconnect=true&useUnicode=true&characterEncoding=GBK那里加上一个&useUnicode=true&characterEncoding=GBK，保证了在数据库操作时候使用了统一的编码字符集，又解决了两个乱码问题，一举两得，嘿嘿。
4、request,response的乱码在网上找了好久，也有两个解决的办法，也是来个转换，还有种办法是写一个过滤器，我选择了后者，因为简单：），这方法用到两个文件，一个是 filter ,一个是 web.xml 文件，代码在后面。
5、至于JS的这个问题，还没办法，只好在JSP页面上改为<%@ page contentType=“text/html; charset=GBK“%>了，反正这样也没问题。
到此为止，乱码问题总算告一段落了，感觉蛮不错的，郁闷了这么久，终于可以高兴了好大一段子了。
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过滤器使用代码：EncodingFilter.java
package com.***.***.***;
import javax.servlet.*;
import java.io.IOException;
/**
* <p>Filter that sets the character encoding to be used in parsing the
* incoming request, either unconditionally or only if the client did not
* specify a character encoding. Configuration of this filter is based on
* the following initialization parameters:</p>
* <ul>
* <li><strong>encoding</strong> - The character encoding to be configured
* for this request, either conditionally or unconditionally based on
* the <code>ignore</code> initialization parameter. This parameter
* is required, so there is no default.</li>
* <li><strong>ignore</strong> - If set to "true", any character encoding
* specified by the client is ignored, and the value returned by the
* <code>selectEncoding()</code> method is set. If set to "false,
* <code>selectEncoding()</code> is called <strong>only</strong> if the
* client has not already specified an encoding. By default, this
* parameter is set to "true".</li>
* </ul>
*
* <p>Although this filter can be used unchanged, it is also easy to
* subclass it and make the <code>selectEncoding()</code> method more
* intelligent about what encoding to choose, based on characteristics of
* the incoming request (such as the values of the <code>Accept-Language</code>
* and <code>User-Agent</code> headers, or a value stashed in the current
* user's session.</p>
*
*/
public class EncodingFilter implements Filter {
// ----------------------------------------------------- Instance Variables
/**
* The default character encoding to set for requests that pass through
* this filter.
*/
protected String encoding = null;
/**
* The filter configuration object we are associated with. If this value
* is null, this filter instance is not currently configured.
*/
protected FilterConfig filterConfig = null;
/**
* Should a character encoding specified by the client be ignored?
*/
protected boolean ignore = true;
// --------------------------------------------------------- Public Methods
/**
* Take this filter out of service.
*/
public void destroy() {
this.encoding = null;
this.filterConfig = null;
}
/**
* Select and set (if specified) the character encoding to be used to
* interpret request parameters for this request.
*
* @param request The servlet request we are processing
* @param result The servlet response we are creating
* @param chain The filter chain we are processing
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet error occurs
*/
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
// Conditionally select and set the character encoding to be used
if (ignore || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null)
request.setCharacterEncoding(encoding);
}
// Pass control on to the next filter
chain.doFilter(request, response);
}
/**
* Place this filter into service.
*
* @param filterConfig The filter configuration object
*/
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
String value = filterConfig.getInitParameter("ignore");
if (value == null)
this.ignore = true;
else if (value.equalsIgnoreCase("true"))
this.ignore = true;
else if (value.equalsIgnoreCase("yes"))
this.ignore = true;
else
this.ignore = false;
}
// ------------------------------------------------------ Protected Methods
/**
* Select an appropriate character encoding to be used, based on the
* characteristics of the current request and/or filter initialization
* parameters. If no character encoding should be set, return
* <code>null</code>.
* <p>
* The default implementation unconditionally returns the value configured
* by the <strong>encoding</strong> initialization parameter for this
* filter.
*
* @param request The servlet request we are processing
*/
protected String selectEncoding(ServletRequest request) {
return (this.encoding);
}
}//EOC
WEB.XML文件：将下面的代码放在WEB.xml文件的<display-name>下面就行了
<filter>
<filter-name>encodingFilter</filter-name>
<display-name>EncodingFilter</display-name>
<description>Set the request encoding</description>
<filter-class>com.voip.admin.util.EncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GB18030</param-value>
</init-param>
<init-param>
<param-name>ignore</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
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