用Filter解决乱码和jsp缓存问题

最新推荐文章于 2025-08-14 09:11:10 发布

转载最新推荐文章于 2025-08-14 09:11:10 发布 · 79 阅读

文章标签：

#java #web.xml

本文介绍了解决Web应用中常见的乱码问题和JSP页面缓存问题的方法。通过创建自定义过滤器（CharSetFilter和CacheFilter），分别设置字符集编码为UTF-8并禁止浏览器缓存JSP页面，确保了数据正确显示且提高了安全性。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

1) 乱码Filter:

新建一个：CharSetFilter

package com.my.filter;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;

public class CharSetFilter implements Filter {
    public CharSetFilter() {}
    
    public void init(FilterConfig config) throws ServletException {
    }
    
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse)resp;
        HttpServletRequest request = (HttpServletRequest)req;
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=\"utf-8\"");
        chain.doFilter(request,response);
    }
    
    public void destroy() {
    }
}

修改web.xml

    <filter>
        <filter-name>charsetFilter</filter-name>
        <filter-class>com.my.filter.CharSetFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>charsetFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

2) JSP缓存问题：

新建一个：CacheFilter

package com.my.filter;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;

public class CacheFilter implements Filter {
    public CacheFilter() {}
    
    public void init(FilterConfig config) throws ServletException {
    }
    
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse)resp;
        HttpServletRequest request = (HttpServletRequest)req;
        response.setDateHeader("Expires",-1);
        response.setHeader("Cache-Control","no-cache");
        response.setHeader("Pragma","no-cache");
        chain.doFilter(request, response);
    }
    
    public void destroy() {
    }
}

修改web.xml

    <filter>
        <filter-name>cahceFilter</filter-name>
        <filter-class>com.my.filter.CacheFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>cahceFilter</filter-name>
        <url-pattern>*.jsp</url-pattern>
    </filter-mapping>