J2EE过滤器

本文并无高深含量 只为数据备份 谢谢
web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
	<filter>
		<filter-name>filterJ</filter-name>
		<filter-class>com.test.FilterCharSet</filter-class>
		<init-param>
			<description>text/html</description>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>filterJ</filter-name>
		<url-pattern>*.txt</url-pattern>
	</filter-mapping>
</web-app>

过滤器

private String encode = null;
@Override
	public void doFilter(ServletRequest srequest, ServletResponse sresponse,
			FilterChain chain) throws IOException, ServletException {
		if (null != encode) {
			HttpServletRequest request = (HttpServletRequest)srequest;
			HttpServletResponse response = (HttpServletResponse)sresponse;
			
			// 对请求进行编码设置
			request.setCharacterEncoding(encode);		//把请求用指定的方法编码
			response.setContentType("text/html");
			response.setCharacterEncoding(encode);	//把返回响应指定 编码方式
			System.out.println("------------过滤编码-------------" + encode);
		}
		// 把处理权限交给下一个过滤器
		chain.doFilter(srequest, sresponse);

		
	}

	@Override
	public void init(FilterConfig config) throws ServletException {
		//获取在web.xml文件中配置了的编码格式的信息
		this.encode = config.getInitParameter("encoding");		
	}