Filter 应用之编码过滤器

  web.xml 文件的配置

<filter>
 	<filter-name>Filter1</filter-name>
 	<filter-class>D20210224.CharFilter</filter-class>
 </filter>
 <filter-mapping>
 	<filter-name>Filter1</filter-name>
 	<url-pattern>/*</url-pattern>
 </filter-mapping>

  CharFilter 类的实现

public class CharFilter implements Filter {
    
    
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    
    
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
//		response.setContentType("text/html charaset=UTF-8");
		chain.doFilter(request, response);
	}
}