发布网友 发布时间:2022-04-23 12:54
共3个回答
热心网友 时间:2022-04-22 23:00
1.首先建一个类(例charset.java),该类实现Filter接口
package com; //com包
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;
public class charset implements Filter {
public void destroy() {
}
public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain arg2) throws IOException, ServletException {
//方法拷贝过来即可
}
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
}
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2.在工程WebRoot/WEB-INIF/web.xml配置文件中写入以下代码:
<filter>
<filter-name>名字(可自定义)</filter-name>
<filter-class>类名</filter-class>
</filter>
<filter-mapping>
<filter-name>同上</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
热心网友 时间:2022-04-23 00:18
配置当然是放在web.xml文件里,映射到相应的类就是了。
热心网友 时间:2022-04-23 01:53
1.先写一个过滤器,实现Filter接口
在doFilter方法中判断用户是否登录(一般将登录信息存放在session中) 如果已登录,则放行否则跳转到登录页面
2.在web.xml配置过滤器
<filter>
<filter-name>自定义</filter-name>
<filter-class>类名</filter-class>
</filter>
<filter-mapping>
<filter-name>同上</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>