JavaWeb——字符编码过滤器

编写一个EncodingFilter

1.读取web.xml文件中配置的当前WEB应用的初始化参数encoding

2.指定请求的字符编码为1读取到的编码

3.调用chain.doFilter()方法"放行"请求

 

   web.xml

 

<context-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </context-param>

 

 

<filter> <filter-name>EncodingFilter</filter-name> <filter-class>com.demo.filter.EncodingFilter</filter-class> </filter> <filter-mapping> <filter-name>EncodingFilter</filter-name> <url-pattern>/filter/b.jsp</url-pattern> </filter-mapping>

 

　　

 

EncodingFilter

 

 

package com.demo.filter; import javax.servlet.FilterChain; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; public class EncodingFilter extends HttpFilter { private String encoding; @Override protected void init() { encoding = getFilterConfig().getServletContext().getInitParameter("encoding"); System.out.println(encoding); } @Override public void doFilter(HttpServletResponse response, HttpServletRequest request, FilterChain filterChain) throws IOException, ServletException { request.setCharacterEncoding(encoding); filterChain.doFilter(request,response); } }

 

　　

 

转载于:https://www.cnblogs.com/yangHS/p/11196011.html

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