自己總結的（建議使用方法1）
方法一：
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寫個過濾器類：
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;
public class Filter1 implements Filter {
 private FilterConfig filterConfig=null;
    private String encoding=null;
    public void init(FilterConfig filterConfig) throws ServletException {
  // TODO 自動生成方法存根
   this.filterConfig=filterConfig;
         this.encoding=this.filterConfig.getInitParameter("encoding");
 }
    public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain chain) throws IOException, ServletException {
  // TODO 自動生成方法存根 
         if(encoding!=null)
         {
         request.setCharacterEncoding(encoding);  
         }
         chain.doFilter(request, response);
}
 public void destroy() {
  // TODO 自動生成方法存根
  this.encoding=null;
        this.filterConfig=null;
 }
}
再在項目的web.xml中配置如下：
     <filter>
   <filter-name>filter1</filter-name>
   <filter-class>com.tools.Filter1</filter-class>
    <init-param>
    <param-name>encoding</param-name>
    <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
   <filter-name>filter1</filter-name>
   <url-pattern>/*</url-pattern>
  </filter-mapping>
注意：所有的JSP頁面的類型均為<%@ page contentType="text/html; charset=UTF-8"%>
//////////////////////////////////////////////////////////////////////////////

方法二：
/////////////////////////////////////////////////////////////////////////
在struts中的可以重寫ActionServlet類的process方法
package tools;//包
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.*;
import org.apache.struts.action.ActionServlet;

public class MyActionServlet extends ActionServlet{

 
 private static final long serialVersionUID = 6864646927139403188L;
   public MyActionServlet()
   {
   
   }
 protected void process(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
  request.setCharacterEncoding("UTF-8");
  super.process(request, response);
 }

}
再在項目的web.xml中
   <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>tools.MyActionServlet</servlet-class>/////////////根據自己的的MyActionSerclet所在的位置
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>3</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>3</param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping> 
</web-app>

注意：所有的JSP頁面的類型均為<%@ page contentType="text/html; charset=UTF-8"%>
1中方法=====================================================
要是數據庫是MYSQL還要在applicationContext.xml配置中加
<property name="url" value="jdbc:mysql://localhost:3306/j2ee?useUnicode=true&amp;characterEncoding=UTF-8"></property>

2中方法.****************************************************
MYSQL 中的hibernate.cfg.xml在<session-factory>和</session-factory>之間加入這么一段：
        <property name="connection.useUnicode">true</property>
        <property name="connection.characterEncoding">UTF-8</property>

這樣一來，是可以解決亂碼問題。