package com.system.controller;import com.system.exception.CustomException;
import com.system.po.Userlogin;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.Subject;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;/*** Created by 李杨勇.*/
@Controller
public class LoginController {//登录跳转@RequestMapping(value = "/login", method = {RequestMethod.GET})public String loginUI() throws Exception {return "../../login";}//登录表单处理@RequestMapping(value = "/login", method = {RequestMethod.POST})public String login(Userlogin userlogin) throws Exception {//Shiro实现登录UsernamePasswordToken token = new UsernamePasswordToken(userlogin.getUsername(),userlogin.getPassword());Subject subject = SecurityUtils.getSubject();//如果获取不到用户名就是登录失败，但登录失败的话，会直接抛出异常subject.login(token);if (subject.hasRole("admin")&userlogin.getRole()==0) {return "redirect:/admin/showStudent";} else if (subject.hasRole("teacher")&userlogin.getRole()==1) {return "redirect:/teacher/showCourse";} else if (subject.hasRole("student")&userlogin.getRole()==2) {return "redirect:/student/showCourse";}else throw new CustomException("请选择正确的身份登陆");}}

package com.system.controller;/*** 文件上传下载*/
@Controller
@RequestMapping("/file")
public class FileController {@Resource(name = "fileServiceImpl")private FileService fileService;@RequestMapping("/upload")public String  fileUpload(@RequestParam MultipartFile file, FileVO filevo, HttpServletRequest request) throws IOException {//上传路径保存设置// 把文件写到磁盘String fileName = file.getOriginalFilename();String[] str = fileName.split("\\.");String uuid = UUID.randomUUID().toString().replaceAll("-","");String headPath = "E://upload/" + uuid+ "."+str[str.length-1];File dest = new File(headPath);file.transferTo(dest);filevo.setFileID(uuid);filevo.setFilePath(headPath);filevo.setUserID(null);try {fileService.save(filevo);} catch (Exception e) {e.printStackTrace();}return "redirect:/admin/showFile";}@RequestMapping("/downFile")public void down(HttpServletRequest request, HttpServletResponse response,String fileID) throws Exception{FileVO fileVO = fileService.findById(fileID);String fileName = fileVO.getFilePath();String[] str = fileName.split("\\.");InputStream bis = new BufferedInputStream(new FileInputStream(new File(fileName)));String filename =  fileVO.getFileName()+"\\."+str[str.length-1];filename = URLEncoder.encode(filename,"UTF-8");response.addHeader("Content-Disposition", "attachment;filename=" + filename);response.setContentType("multipart/form-data");BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());int len = 0;while((len = bis.read()) != -1){out.write(len);out.flush();}out.close();}}

package com.system.exception;/***  系统自定义异常类，针对预期异常，需要在程序中抛出此类的异常*/
public class CustomException extends Exception {//异常信息public String message;public CustomException(String message) {super(message);this.message=message;}public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}
}

CREATE TABLE `college` (`collegeID` int(11) NOT NULL,`collegeName` varchar(200) NOT NULL COMMENT '课程名',PRIMARY KEY (`collegeID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;insert  into `college`(`collegeID`,`collegeName`) values (1,'计算机系'),(2,'设计系'),/*Table structure for table `course` */DROP TABLE IF EXISTS `course`;CREATE TABLE `course` (`courseID` int(11) NOT NULL,`courseName` varchar(200) NOT NULL COMMENT '课程名称',`teacherID` int(11) NOT NULL,`courseTime` varchar(200) DEFAULT NULL COMMENT '开课时间',`classRoom` varchar(200) DEFAULT NULL COMMENT '开课地点',`courseWeek` int(200) DEFAULT NULL COMMENT '学时',`courseType` varchar(20) DEFAULT NULL COMMENT '课程类型',`collegeID` int(11) NOT NULL COMMENT '所属院系',`score` int(11) NOT NULL COMMENT '学分',PRIMARY KEY (`courseID`),KEY `collegeID` (`collegeID`),KEY `teacherID` (`teacherID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;/*Data for the table `course` */insert  into `course`(`courseID`,`courseName`,`teacherID`,`courseTime`,`classRoom`,`courseWeek`,`courseType`,`collegeID`,`score`) values (1,'C语言程序设计',1001,'周二','科401',18,'必修课',1,3),(3,'数据结构',1001,'周四','科401',18,'必修课',1,2),(4,'Java程序设计',1002,'周五','科401',18,'必修课',1,2),(5,'英语',1002,'周四','X302',18,'必修课',2,2),(6,'服装设计',1003,'周一','科401',18,'选修课',2,2);/*Table structure for table `role` */DROP TABLE IF EXISTS `role`;CREATE TABLE `role` (`roleID` int(11) NOT NULL,`roleName` varchar(20) NOT NULL,`permissions` varchar(255) DEFAULT NULL COMMENT '权限',PRIMARY KEY (`roleID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;insert  into `role`(`roleID`,`roleName`,`permissions`) values (0,'admin',NULL),(1,'teacher',NULL),(2,'student',NULL);/*Table structure for table `selectedcourse` */DROP TABLE IF EXISTS `selectedcourse`;CREATE TABLE `selectedcourse` (`courseID` int(11) NOT NULL,`studentID` int(11) NOT NULL,`mark` int(11) DEFAULT NULL COMMENT '成绩',KEY `courseID` (`courseID`),KEY `studentID` (`studentID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;/*Data for the table `selectedcourse` */insert  into `selectedcourse`(`courseID`,`studentID`,`mark`) values (2,10001,12),(1,10001,95),(1,10002,66),(2,10003,99),(5,10001,NULL),/*Table structure for table `student` */DROP TABLE IF EXISTS `student`;CREATE TABLE `student` (`userID` int(11) NOT NULL AUTO_INCREMENT,`userName` varchar(200) NOT NULL,`sex` varchar(20) DEFAULT NULL,`birthYear` date DEFAULT NULL COMMENT '出生日期',`grade` date DEFAULT NULL COMMENT '入学时间',`collegeID` int(11) NOT NULL COMMENT '院系id',PRIMARY KEY (`userID`),KEY `collegeID` (`collegeID`)
) ENGINE=InnoDB AUTO_INCREMENT=10008 DEFAULT CHARSET=utf8;/*Data for the table `student` */insert  into `student`(`userID`,`userName`,`sex`,`birthYear`,`grade`,`collegeID`) values (9999,'mike1','男','1996-09-03','2019-11-13',3),(10001,'小红','男','2020-03-02','2020-03-02',1),(10002,'小绿','男','2020-03-10','2020-03-10',1),(10003,'小陈','女','1996-09-02','2015-09-02',2),/*Table structure for table `teacher` */DROP TABLE IF EXISTS `teacher`;CREATE TABLE `teacher` (`userID` int(11) NOT NULL AUTO_INCREMENT,`userName` varchar(200) NOT NULL,`sex` varchar(20) DEFAULT NULL,`birthYear` date NOT NULL,`degree` varchar(20) DEFAULT NULL COMMENT '学历',`title` varchar(255) DEFAULT NULL COMMENT '职称',`grade` date DEFAULT NULL COMMENT '入职时间',`collegeID` int(11) NOT NULL COMMENT '院系',PRIMARY KEY (`userID`),KEY `collegeID` (`collegeID`)
) ENGINE=InnoDB AUTO_INCREMENT=1004 DEFAULT CHARSET=utf8;/*Data for the table `teacher` */insert  into `teacher`(`userID`,`userName`,`sex`,`birthYear`,`degree`,`title`,`grade`,`collegeID`) values (1001,'刘老师','女','1990-03-08','硕士','副教授','2015-09-02',2),(1002,'张老师','女','1996-09-02','博士','讲师','2015-09-02',1),(1003,'软老师','女','1996-09-02','硕士','助教','2017-07-07',1);/*Table structure for table `userlogin` */CREATE TABLE `userlogin` (`userID` int(11) NOT NULL AUTO_INCREMENT,`userName` varchar(200) NOT NULL,`password` varchar(200) NOT NULL,`role` int(11) NOT NULL DEFAULT '2' COMMENT '角色权限',PRIMARY KEY (`userID`),KEY `role` (`role`)
) ENGINE=InnoDB AUTO_INCREMENT=23 DEFAULT CHARSET=utf8;