emr_research/src/main/java/com/emr/controller/LoginController.java

package com.emr.controller;

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.IncorrectCredentialsException;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * @author HJL
 * @create 2019/4/29
 */
@Controller
public class LoginController {

    @RequestMapping(value = "/toLogin")
    public String toLogin(Model model) {
        return "Login";
    }
    //实现用户登录@PathVariable("username")
    /*@ResponseBody*/
    @RequestMapping(value = "/login")
    public String Login(@RequestParam("username")String username, @RequestParam("password")String password, Model model) {
        UsernamePasswordToken token = new UsernamePasswordToken(username, password);
        //token.setRememberMe(true);
        Subject subject = SecurityUtils.getSubject();
        String error = null;

        try {

            subject.login(token);
        } catch (UnknownAccountException e) {
            error = "用户名/密码错误";
        } catch (IncorrectCredentialsException e) {
            error = "用户名/密码错误";
        } catch (AuthenticationException e) {
            //其他错误，比如锁定，如果想单独处理请单独catch处理
            error = "其他错误：" + e.getMessage();
        }
        System.out.println("error:" + error);

        if (error != null) {//出错了，返回登录页面
            model.addAttribute("error", error);
            return "login";
        } else {//登录成功

        }
        //登录成功后会跳转到successUrl配置的链接，不用管下面返回的链接
        return "index";
    }
}