過濾器

web.xml

  <!-- 編碼過濾器 -->
  <filter>
  <filter-name>guolvqi</filter-name>
  <filter-class>com.prozj.filter.GuoLvQi</filter-class>
  <init-param>
   <param-name>encoding</param-name>
   <param-value>UTF-8</param-value>
  </init-param>
  </filter>
  <filter-mapping>
  <filter-name>guolvqi</filter-name>
  <url-pattern>/*</url-pattern>
  </filter-mapping>

 

filter實現類

private String coding="";
public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {
  
HttpServletRequest req=(HttpServletRequest)request;
HttpServletResponse resp=(HttpServletResponse)response;
req.setCharacterEncoding(coding);
resp.setCharacterEncoding(coding);
chain.doFilter(req, resp);
 }
public void init(FilterConfig filterConfig) throws ServletException {
 coding=filterConfig.getInitParameter("encoding")==null?"gbk":filterConfig.getInitParameter("encoding");
 }