Java web项目中的强制登录功能实现代码

为了避免直接进入项目中存在的页面，使用filter过滤器

新建一个类loginfilter:

package com.tjcu.filter;
 
import com.tjcu.entity.user;
 
import javax.servlet.*;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import javax.servlet.http.httpsession;
import java.io.ioexception;
 
public class loginfilter implements filter{
    @override
    public void init(filterconfig filterconfig) throws servletexception {
 
    }
 
    @override
    public void dofilter(servletrequest servletrequest, servletresponse servletresponse, filterchain filterchain) throws ioexception, servletexception {
        httpservletrequest request = (httpservletrequest) servletrequest;
        httpsession session = request.getsession();
        user user = (user) session.getattribute("user");
        httpservletresponse response = (httpservletresponse) servletresponse;
        if (user!=null) {
            filterchain.dofilter(request,response);
        }else {
            response.sendredirect(request.getcontextpath()+"/login.jsp");
        }
    }
 
    @override
    public void destroy() {
 
    }
}

在web文件中通知服务器开发了这个过滤器

web.xml:

  <filter>
    <filter-name>loginfilter</filter-name>
    <filter-class>com.tjcu.filter.loginfilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>loginfilter</filter-name>
    <url-pattern>/main/*</url-pattern>
  </filter-mapping>

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