拦截器 ‹filter› ‹filter-mapping›

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说明

<filter>

过滤器元素将一个名字与一个实现javax.servlet.Filter接口的类相关联

<filter-mapping>

一旦命名了一个过滤器，就要利用filter-mapping元素把它与一个或多个servlet或JSP页面相关联

@Override

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

    //请求传递前处理

    chain.doFilter(request, response);

    //请求处理后处理

}

<filter>

  <filter-name>characterEncodingFilter</filter-name>

  <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

  <init-param>

    <!-- 设置编码方式 -->

    <param-name>encoding</param-name>

    <param-value>UTF-8</param-value>

  </init-param>

  <init-param>

    <!-- 强制请求对象使用encoding的编码方式 -->

    <param-name>forceRequestEncoding</param-name>

    <param-value>true</param-value>

  </init-param>

  <init-param>

    <!-- 强制响应对象使用encoding的编码方式 -->

    <param-name>forceResponseEncoding</param-name>

    <param-value>true</param-value>

  </init-param>

</filter>

<!-- 为Servlet关联过滤器 -->

<filter-mapping>

  <filter-name>characterEncodingFilter</filter-name>

  <url-pattern>/*</url-pattern>

</filter-mapping>

<filter>

  <filter-name>xxx</filter-name>

  <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>

  <init-param>

    <param-name>targetBeanName</param-name>

    <param-value>simpleFilter</param-value>

  </init-param>

</filter>

<filter-mapping>

  <filter-name>xxx</filter-name>

  <url-pattern>/*</url-pattern>

</filter-mapping>