基于SSM实现学生管理系统

@RequestMapping("/student")
@Controller
public class StudentController {
 
 @Autowired
 private StudentService studentService;
 @Autowired
 private ClazzService clazzService;
 /**
 * 学生列表页
 * @param model
 * @return
 */
 @RequestMapping(value="/list",method=RequestMethod.GET)
 public ModelAndView list(ModelAndView model){
 model.setViewName("student/student_list");
 List<Clazz> clazzList = clazzService.findAll();
 model.addObject("clazzList",clazzList );
 model.addObject("clazzListJson",JSONArray.fromObject(clazzList));
 return model;
 }
 
 /**
 * 获取学生列表
 * @param name
 * @param page
 * @return
 */
 @RequestMapping(value="/get_list",method=RequestMethod.POST)
 @ResponseBody
 public Map<String, Object> getList(
 @RequestParam(value="name",required=false,defaultValue="") String name,
 @RequestParam(value="clazzId",required=false) Long clazzId,
 HttpServletRequest request,
 Page page
 ){
 Map<String, Object> ret = new HashMap<String, Object>();
 Map<String, Object> queryMap = new HashMap<String, Object>();
 queryMap.put("username", "%"+name+"%");
 Object attribute = request.getSession().getAttribute("userType");
 if("2".equals(attribute.toString())){
 //说明是学生
 Student loginedStudent = (Student)request.getSession().getAttribute("user");
 queryMap.put("username", "%"+loginedStudent.getUsername()+"%");
 }
 if(clazzId != null){
 queryMap.put("clazzId", clazzId);
 }
 queryMap.put("offset", page.getOffset());
 queryMap.put("pageSize", page.getRows());
 ret.put("rows", studentService.findList(queryMap));
 ret.put("total", studentService.getTotal(queryMap));
 return ret;
 }
 
 /**
 * 编辑学生信息
 * @param clazz
 * @return
 */
 @RequestMapping(value="/edit",method=RequestMethod.POST)
 @ResponseBody
 public Map<String, String> edit(Student student){
 Map<String, String> ret = new HashMap<String, String>();
 if(StringUtils.isEmpty(student.getUsername())){
 ret.put("type", "error");
 ret.put("msg", "学生姓名不能为空！");
 return ret;
 }
 if(StringUtils.isEmpty(student.getPassword())){
 ret.put("type", "error");
 ret.put("msg", "学生登录密码不能为空！");
 return ret;
 }
 if(student.getClazzId() == null){
 ret.put("type", "error");
 ret.put("msg", "请选择所属班级！");
 return ret;
 }
 if(isExist(student.getUsername(), student.getId())){
 ret.put("type", "error");
 ret.put("msg", "该姓名已存在！");
 return ret;
 }
 student.setSn(StringUtil.generateSn("S", ""));
 if(studentService.edit(student) <= 0){
 ret.put("type", "error");
 ret.put("msg", "学生添加失败！");
 return ret;
 }
 ret.put("type", "success");
 ret.put("msg", "学生修改成功！");
 return ret;
 }
 
 
 /**
 * 添加学生信息
 * @param student
 * @return
 */
 @RequestMapping(value="/add",method=RequestMethod.POST)
 @ResponseBody
 public Map<String, String> add(Student student){
 Map<String, String> ret = new HashMap<String, String>();
 if(StringUtils.isEmpty(student.getUsername())){
 ret.put("type", "error");
 ret.put("msg", "学生姓名不能为空！");
 return ret;
 }
 if(StringUtils.isEmpty(student.getPassword())){
 ret.put("type", "error");
 ret.put("msg", "学生登录密码不能为空！");
 return ret;
 }
 if(student.getClazzId() == null){
 ret.put("type", "error");
 ret.put("msg", "请选择所属班级！");
 return ret;
 }
 if(isExist(student.getUsername(), null)){
 ret.put("type", "error");
 ret.put("msg", "该姓名已存在！");
 return ret;
 }
 student.setSn(StringUtil.generateSn("S", ""));
 if(studentService.add(student) <= 0){
 ret.put("type", "error");
 ret.put("msg", "学生添加失败！");
 return ret;
 }
 ret.put("type", "success");
 ret.put("msg", "学生添加成功！");
 return ret;
 }
 
 /**
 * 删除学生信息
 * @param ids
 * @return
 */
 @RequestMapping(value="/delete",method=RequestMethod.POST)
 @ResponseBody
 public Map<String, String> delete(
 @RequestParam(value="ids[]",required=true) Long[] ids
 ){
 Map<String, String> ret = new HashMap<String, String>();
 if(ids == null || ids.length == 0){
 ret.put("type", "error");
 ret.put("msg", "请选择要删除的数据！");
 return ret;
 }
 try {
 if(studentService.delete(StringUtil.joinString(Arrays.asList(ids), ",")) <= 0){
 ret.put("type", "error");
 ret.put("msg", "删除失败！");
 return ret;
 }
 } catch (Exception e) {
 // TODO: handle exception
 ret.put("type", "error");
 ret.put("msg", "该学生下存在其他信息，请勿冲动！");
 return ret;
 }
 ret.put("type", "success");
 ret.put("msg", "学生删除成功！");
 return ret;
 }
 
 /**
 * 上传用户头像图片
 * @param photo
 * @param request
 * @param response
 * @return
 * @throws IOException
 */
 @RequestMapping(value="/upload_photo",method=RequestMethod.POST)
 @ResponseBody
 public Map<String, String> uploadPhoto(MultipartFile photo,
 HttpServletRequest request,
 HttpServletResponse response
 ) throws IOException{
 Map<String, String> ret = new HashMap<String, String>();
 if(photo == null){
 //文件没有选择
 ret.put("type", "error");
 ret.put("msg", "请选择文件！");
 return ret;
 }
 if(photo.getSize() > 10485760){
 //文件没有选择
 ret.put("type", "error");
 ret.put("msg", "文件大小超过10M，请上传小于10M的图片！");
 return ret;
 }
 String suffix = photo.getOriginalFilename().substring(photo.getOriginalFilename().lastIndexOf(".") + 1,photo.getOriginalFilename().length());
 if(!"jpg,png,gif,jpeg".contains(suffix.toLowerCase())){
 ret.put("type", "error");
 ret.put("msg", "文件格式不正确，请上传jpg,png,gif,jpeg格式的图片！");
 return ret;
 }
 String savePath = request.getServletContext().getRealPath("/") + "\\upload\\";
 System.out.println(savePath);
 File savePathFile = new File(savePath);
 if(!savePathFile.exists()){
 savePathFile.mkdir();//如果不存在，则创建一个文件夹upload
 }
 //把文件转存到这个文件夹下
 String filename = new Date().getTime() + "." + suffix;
 photo.transferTo(new File(savePath + filename ));
 ret.put("type", "success");
 ret.put("msg", "图片上传成功！");
 ret.put("src", request.getServletContext().getContextPath() + "/upload/" + filename);
 return ret;
 }
 
 private boolean isExist(String username,Long id){
 Student student = studentService.findByUserName(username);
 if(student != null){
 if(id == null){
 return true;
 }
 if(student.getId().longValue() != id.longValue()){
 return true;
 }
 }
 return false;
 }
}