SpringAOP实现登录验证的操作代码

要求任何操作都建立在已经登录的基础上，登录操作除外。。。。

使用spring aop不仅简单，还不会对其他部件中产生影响

以下具体代码实现：

package com.joey.util;
 
import org.apache.logging.log4j.logmanager;
import org.apache.logging.log4j.logger;
import org.aspectj.lang.proceedingjoinpoint;
import org.aspectj.lang.annotation.around;
import org.aspectj.lang.annotation.aspect;
import org.aspectj.lang.annotation.pointcut;
import org.springframework.stereotype.component;
import org.springframework.web.context.request.requestcontextholder;
import org.springframework.web.context.request.servletrequestattributes;
import org.springframework.web.servlet.modelandview;
 
import javax.servlet.http.httpservletrequest;

/**
 * 登录验证aop
 */
@component
@aspect
public class loginhelper {
 
    private static logger logger = logmanager.getlogger(loginhelper.class.getname());
 
    @pointcut("within(com.joey.controller..*)&&!within(com.joey.controller.indexcontroller)") // indexcontroller中写了登录方法
    public void login() {
    }
 
    @around("login()")
    public object auth(proceedingjoinpoint joinpoint) throws throwable {
        // 获取session中的用户信息
     httpservletrequest request = ((servletrequestattributes) requestcontextholder.getrequestattributes()).getrequest();
        string username = (string) request.getsession().getattribute("username");
 
        if (username == null) {
            logger.info("未登录");
            return new modelandview("redirect:/login");
        }
        logger.info("username: " + username);
        return joinpoint.proceed();
    }
}
既然要从session中获取用户信息，那么肯定要先保存的。可以自登录方法中保存username

package com.joey.controller;

import com.joey.model.user;
import com.joey.service.userservice;
import org.apache.logging.log4j.logmanager;
import org.apache.logging.log4j.logger;
import org.springframework.stereotype.controller;
import org.springframework.web.bind.annotation.requestmapping;
import org.springframework.web.bind.annotation.requestmethod;
import org.springframework.web.servlet.modelandview;

import javax.annotation.resource;
import javax.servlet.http.httpservletrequest;

@controller
@requestmapping("/")
public class indexcontroller {
private static logger logger = logmanager.getlogger(indexcontroller.class.getname());

@resource(name = "userservice")
private userservice userservice;

@requestmapping(value = {"", "index", "login"}, method = requestmethod.get)
public string index() {
    return "login";
}

/**
 * 管理员/普通用户登陆
 *
 * @param username
 * @param password
 * @return
 */
@requestmapping(value = {"login"}, method = requestmethod.post)
public modelandview login(httpservletrequest request, string username, string password) {
    int id;
    try {
        id = userservice.login(username, password);
    } catch (exception e) {
        e.printstacktrace();
        logger.info("not found");
        return new modelandview("login")
                .addobject("msg", "try again");
    }
    user user = userservice.selectbyprimarykey(id);
    request.getsession().setattribute("username", user.getname());  // 保存username到session看这里
    return new modelandview(user.getadmin() == 1 ? "admin" : "home")
            .addobject("id", user.getid())
            .addobject("username", user.getname())
            .addobject("description", user.getdescription())
            .addobject("isadmin", user.getadmin() == 1 ? "admin" : "user");
}

@requestmapping(value = "home", method = requestmethod.get)
public string home() {
    return "admin";
}

}

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