过滤器Filter

新建一个class 导入filter的接口
public class EncodingFilter implements Filter {



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

}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
System.out.println("encodingFilter doFilter-----");
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");

chain.doFilter(request,response);
}
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
System.out.println("过滤器初始化");
}

}
回到web.xml里面
  <!-- 配置过滤器 -->

  <filter>

  <filter-name>encodingFilter</filter-name>

  <filter-class>com.neusoft.servlet.EncodingFilter</filter-class>

  </filter>

  <!-- 定义过滤器路径 -->

  <filter-mapping>

  <filter-name>encodingFilter</filter-name>

  <url-pattern>/*</url-pattern>

  </filter-mapping>