shiro的身份登录

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.ExcessiveAttemptsException;
import org.apache.shiro.authc.IncorrectCredentialsException;
import org.apache.shiro.authc.LockedAccountException;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ShiroController {
	protected final static Logger logger = LogManager.getLogger(ShiroController.class);
	
	/**
	 * 身份验证
	 * @param username
	 * @param password
	 * @return
	 */
	@RequestMapping(value = "/login", method = RequestMethod.POST)
    public String login(@RequestParam("phone") String phone, @RequestParam("password") String password) {
        // 从SecurityUtils里边创建一个 subject
        Subject subject = SecurityUtils.getSubject();
        // 在认证提交前准备 token（令牌）
        UsernamePasswordToken token = new UsernamePasswordToken(phone, password);
        // 执行认证登陆
        try {
            subject.login(token);
        } catch (UnknownAccountException uae) {
            return "未知账户";
        } catch (IncorrectCredentialsException ice) {
            return "密码不正确";
        } catch (LockedAccountException lae) {
            return "账户已锁定";
        } catch (ExcessiveAttemptsException eae) {
            return "用户名或密码错误次数过多";
        } catch (AuthenticationException ae) {
            return "用户名或密码不正确！";
        }
        if (subject.isAuthenticated()) {
            return "登录成功";
        } else {
            token.clear();
            return "登录失败";
        }
    }
	
	/**
	 * 退出登录
	 * @return
	 */
	@RequestMapping(value="logout",method=RequestMethod.GET)
	public String logout(){
		Subject subject = SecurityUtils.getSubject();
		try {
			subject.logout();
		} catch (Exception e) {
			logger.error("errorMessage:" + e.getMessage());
		}
		return "退出成功";
	}
	
}