javaweb过滤器与器_java过滤器配置_java器怎么写(7)

<filter>

<filter-name>AutologinFilter</filter-name>

<filter-class>cn.itcast.filter.AutologinFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>AutologinFilter</filter-name>

<!-- 因配置文件中默认的主页index.jsp，所访问根路径的时候，默认会跳转到主页上，所以，我们配置 url-pattern使用index.jsp -->

<url-pattern>/index.jsp</url-pattern>

</filter-mapping>

<!-- =======================过滤器配置=============================== -->

需求：请求参数在每一个servlet中单独中文乱码处理，代码重复

优化的思路，使用一个过滤器，在请求到达servlet之前，先对象request对象进行设置编码

要对所有的请求都要进行设置编码，都要拦截，进行增强，url-pattern:/*

过滤器代码：

package cn.itcast.filter;

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;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

publicclass EncodingFilter implements Filter{

@Override

publicvoid init(FilterConfig filterConfig) throws ServletException {

}

@Override

publicvoid doFilter(ServletRequest request, ServletResponse response,

FilterChain chain) throws IOException, ServletException {

// 强制转换request response

HttpServletRequest req = (HttpServletRequest)request;

HttpServletResponse res = (HttpServletResponse)response;

//处理响应乱码

res.setContentType("text/html;charset=utf-8");

//处理POST请求乱码

req.setCharacterEncoding("utf-8");

chain.doFilter(req, res);

本文来自电脑杂谈，转载请注明本文网址：
http://www.pc-fly.com/a/shouji/article-47577-7.html