一个中文过滤器代码

package com.itcast.filter;

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 SetCodeFilter implements Filter {

public void destroy() {
// TODO Auto-generated method stub

}

public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
req.setCharacterEncoding("utf8");
chain.doFilter(req,res);
}

public void init(FilterConfig arg0) throws ServletException {

}

}

相应的web.xml文件中的配置是：

<filter>
<filter-name>setCodeFilter</filter-name>
<filter-class>com.itcast.filter.SetCodeFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>setCodeFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>setCodeFilter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>