适合情况 -> 从jsp传入到action时的乱码情况,这里以GBK为例

1.建立一个用于转换编码的filter
文件位置举例:src.util.SetCharacterEncodingFilter.java

复制代码 代码如下:
package util;

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.UnavailableException;

/**
* Example filter that sets the character encoding to be used in parsing the
* incoming request
*/
public class SetCharacterEncodingFilter implements Filter {

/**
* Take this filter out of service.
*/
public void destroy() {
}
/**
* Select and set (if specified) the character encoding to be used to
* interpret request parameters for this request.
*/
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)throws IOException, ServletException {

request.setCharacterEncoding("gbk");

// 传递控制到下一个过滤器
chain.doFilter(request, response);
}

public void init(FilterConfig filterConfig) throws ServletException {
}
}

2.修改web.xml,在struts的FilterDispatcher映射之前添加2个filter
复制代码 代码如下:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http:///xml/ns/javaee/web-app_2_5.xsd">
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<filter>
<filter-name>Set Character Encoding</filter-name>
<filter-class>util.SetCharacterEncodingFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>Set Character Encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<filter>
<filter-name>struts-cleanup</filter-name>
<filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>
</filter>
<filter-mapping>
<filter-name>struts-cleanup</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>




<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>

3.你的JSP头应该有
<%@ page language="java" pageEncoding="GBK"%>

4.在struts.xml中修改默认的编码设定
复制代码 代码如下:
<struts>
<constant name="struts.i18n.encoding" value="gbk"></constant>

...
...
...

</struts>

基本上就这样可以解决大多传入的字符乱码问题

PS:如果是数据库提取字符乱码,比如mysql,确认你的数据库内字符是gbk,并且连接字符串指定了字符编码
<property name="url" value="jdbc:mysql://localhost/database?useUnicode=true&amp;characterEncoding=gbk"></property>