过滤器实现统一编码

package org.zln.utils.filter;

import javax.servlet.*;
import java.io.IOException;

/**
* Created by sherry on 2015/2/6 0006 15:40.
*/
public class CharactorFilter implements Filter {
String encoding = null;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
encoding = filterConfig.getInitParameter("encoding");
}

@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
if (encoding != null){
servletRequest.setCharacterEncoding(encoding);
servletResponse.setContentType("text/html;charset="+encoding);
System.out.println(" ---字符过滤---"+encoding);
}
filterChain.doFilter(servletRequest,servletResponse);
}

@Override
public void destroy() {
encoding = null;
}
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">

<!--字符过滤器-->
<filter>
<filter-name>CharactorFilter</filter-name>
<filter-class>org.zln.utils.filter.CharactorFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharactorFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

</web-app>