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  • Servlet过滤器---编码转换过滤器

    该实例用于将请求与相应的编码设置为当前网站的默认编码

    java类:

    import java.io.IOException;
    
    import javax.servlet.Filter;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    
    public class EncodingFilter implements Filter {
        
        private String charEncoding = null;
    
        public EncodingFilter() {
        }
    
        /**
         * @see Filter#init(FilterConfig)
         */
        public void init(FilterConfig fConfig) throws ServletException {
            charEncoding = fConfig.getInitParameter("charEncoding");
            if (charEncoding == null || charEncoding.equals("null")) {
                throw new ServletException("EncodingFilter中的编码设置为空");
            }
        }
    
        /**
         * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
         */
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
            // 将设置的编码与请求的编码进行比较,若不同,则将请求的编码设置为设置的编码
            if (!charEncoding.equals(request.getCharacterEncoding())) {
                request.setCharacterEncoding(charEncoding);
            }
            // 将相应的编码设置为设置的编码
            response.setCharacterEncoding(charEncoding);
            chain.doFilter(request, response);
            
        }
    
        /**
         * @see Filter#destroy()
         */
        public void destroy() {
            // TODO Auto-generated method stub
        }

    web.xml:

    <filter>
          <filter-name>encodingFilter</filter-name>
          <filter-class>com.hudongwu.filter.EncodingFilter</filter-class>
          <init-param>
              <param-name>charEncoding</param-name>
              <param-value>UTF-8</param-value>
          </init-param>
      </filter>
      <filter-mapping>
          <filter-name>encodingFilter</filter-name>
          <url-pattern>/*</url-pattern>
      </filter-mapping>

     Servlet过滤器---目录

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  • 原文地址:https://www.cnblogs.com/xiaobaizhiqian/p/7587446.html
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