(1):用过滤器 
新建一个类ChineseFilter 
//生成自己的过滤器 
 
package org.perfect.struts.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.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
 
public class ChineseFilter extends HttpServlet implements Filter { 
 
private FilterConfig filterConfig; 
 
public void init(FilterConfig filterConfig) throws ServletException { 
this.filterConfig = filterConfig; 
} 
 
public void doFilter(ServletRequest request, ServletResponse response, 
FilterChain filterChain) { 
try { 
 
String encoding=filterConfig.getInitParameter("encoding");//从WEB.xml配置文件中取出参数，这样我们可以通过配置修改编码格式． 
request.setCharacterEncoding(encoding);//设置请求的编码格式 
System.out.println(encoding); 
filterChain.doFilter(request, response);//关键 
} catch (ServletException sx) { 
filterConfig.getServletContext().log(sx.getMessage()); 
} catch (IOException iox) { 
filterConfig.getServletContext().log(iox.getMessage()); 
} 
} 
 
 
public void destroy() { 
} 
 
protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException { 
super.doGet(arg0, arg1); 
} 
 
protected void doPost(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException { 
super.doPost(arg0, arg1); 
} 
} 
编译后把.class文件放到项目的web-inf的classes中 
然后在修改web.xml 
加上 
 
<filter> 
<filter-name>ChineseFilter</filter-name> 
<filter-class>org.perfect.struts.filters.ChineseFilter</filter-class> 
<init-param> 
<param-name>encoding</param-name> 
<param-value>GBK</param-value> 
</init-param> 
</filter> 
<filter-mapping> 
<filter-name>ChineseFilter</filter-name> 
<url-pattern>/*</url-pattern> 
</filter-mapping> 
重启服务器,应该可以了 
第二种方式是: 
把获取来的参数重新编码 
String username = new String(request.getParameter("username").getBytes("iso-8859-1"),"GBK"); 
这样也可以了