web.xml中配置编码过滤器两种方式

在web.xml配置filter时一定要放在所有过滤器之前

    <!--处理中文乱码-->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern><!-- 写成/时，上传时会乱码 -->
    </filter-mapping>

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public class EncodingFilter implements Filter {

    private String encoding = "utf-8";

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        if(filterConfig.getInitParameter("encoding")!=null){
            encoding=filterConfig.getInitParameter("encoding");
        }
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest)servletRequest;
        HttpServletResponse response=(HttpServletResponse)servletResponse;
        request.setCharacterEncoding(encoding);
        response.setCharacterEncoding(encoding);
        filterChain.doFilter(request,response);
    }


    @Override
    public void destroy() {

    }
}

  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>com.imooc.oa.global.EncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>utf-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/</url-pattern>
  </filter-mapping>

（记录于慕课网SSM oa项目）

  <!--配置编码过滤器，一定要放在所有过滤器之前-->
  <filter>
    <filter-name>CharacterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceRequestEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
    <init-param>
      <param-name>forceResponseEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

（记录于尚硅谷ssm-crud项目）