一个解决JSP中文乱码的过滤器

package com.jsp.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 SetCharacterEncodingFilter implements Filter{


protected String encoding=null;
protected FilterConfig filterConfig=null;
protected boolean ignore=true;


public void destroy(){
this.encoding=null;
this.filterConfig=null;
}


public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain)
throws IOException,ServletException{


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


String encoding=selectEncoding(request);
if(encoding!=null)
request.setCharacterEncoding(encoding);
}

chain.doFilter(request,response);

}

public void init(FilterConfig filterConfig) throws ServletException{
this.filterConfig=filterConfig;
this.encoding=filterConfig.getInitParameter("encoding");
String value=filterConfig.getInitParameter("ignore");
if(value==null) this.ignore=true;
else if(value.equalsIgnoreCase("true")) this.ignore=true;
else if(value.equalsIgnoreCase("yes")) this.ignore=true;
else this.ignore=false;
}

protected String selectEncoding (ServletRequest request){
return (this.encoding);
}

}

还需要配置xml文件。只要在xml文件里加入以下一段代码即可。

<filter>
<filter-name>setcharcode</filter-name>
<filter-class>com.jsp.filter.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>setcharcode</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

处理网页中文乱码的方法很多，过滤器只是一种。