使用Filter对Request进行统一编码

package test.encoding;




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 SetCharacterEncoding implements Filter ...{


protected String encoding=null;


protected FilterConfig filterconfig=null;


protected boolean ignore=true;




public void destroy() ...{


// TODO Auto-generated method stub




}




public void doFilter(ServletRequest request, ServletResponse response,




FilterChain arg2) throws IOException, ServletException ...{




if(ignore||(request.getCharacterEncoding()==null))...{


String encoding=this.selectEncoding(request);




if(encoding!=null)...{


request.setCharacterEncoding(encoding);


}


}


arg2.doFilter(request, response);




}






public void init(FilterConfig filterconfig) throws ServletException ...{


this.filterconfig=filterconfig;


String encoding=filterconfig.getInitParameter("encoding");


String value=filterconfig.getInitParameter("ignore");


if(value==null)




...{


ignore=true;


}




else if(value.equalsIgnoreCase("true"))...{


ignore=true;


}




else if(value.equalsIgnoreCase("yes"))...{


ignore=true;


}




else...{


ignore=false;


}




}




public String selectEncoding(ServletRequest request)...{


return (this.encoding);


}




}




<filter>


<filter-name>setCharacterEncoding</filter-name>


<filter-class>test.encoding.SetCharacterEncoding</filter-class>


<init-param>


<param-name>encoding</param-name>


<param-value>gb2312</param-value>


</init-param>




</filter>


<filter-mapping>


<filter-name>setCharacterEncoding</filter-name>


<url-pattern>/*</url-pattern>


</filter-mapping>