gson（基于SSM框架的在线考试系统设计）

基于SSM框架的在线考试系统分为学生和教师两种角色。 学生可以注册、登录，进入系统后如果有教师安排的考试，可以进行考试和查看已经结束的考试结果。

教师拥有基本信息管理、班级管理、教师管理、学生管理、考试管理、试题管理、考试安排管理和查看以往考试结果等功能，对整个系统拥有最高管理权限。

public class GradeInfoHandler { @Autowired @Qualifier("gson") private Gson gson; @Autowired private GradeInfoService gradeInfoService; private Logger logger = Logger.getLogger(GradeInfoHandler.class); /** * 获取所有年级集合 * @return */ @RequestMapping(value="/grades") public ModelAndView getGrades() { logger.info("获取所有年级"); ModelAndView model = new ModelAndView(); model.setViewName("admin/grades"); //获取所有年级 List<GradeInfo> grades = gradeInfoService.getGrades(); model.addObject("grades", grades); return model; } /** * 预添加年级处理 * @param map * @return */ @RequestMapping("/preAddGrade") public String preAddGrade(Map<String, Object> map) { logger.info("年级添加预处理"); map.put("grade", new GradeInfo()); return "admin/gradeedit"; } /** * 添加年级 * @param grade * @param request * @return */ @RequestMapping(value="/grade", method=RequestMethod.POST) public String isAddGrade(GradeInfo grade, HttpServletRequest request) { logger.info("添加年级 "+grade); if (grade == null) { logger.error("年级 "+grade+" 为空"); request.setAttribute("error", "年级添加失败，请稍后再试！"); return "error"; } int row = gradeInfoService.isAddGrade(grade); if (row < 1) { logger.error("年级添加失败"); request.setAttribute("error", "年级添加失败，请稍后再试！"); return "error"; } return "redirect:grades"; } /** * 预修改年级处理 * @param gradeId 待修改年级编号 * @param map * @return */ @RequestMapping(value="/grade/update/{gradeId}", method=RequestMethod.GET) public String preUpdateGrade(@PathVariable("gradeId") Integer gradeId, Map<String, Object> map) { logger.info("年级修改预处理"); map.put("grade", gradeInfoService.getGradeById(gradeId)); return "/admin/gradeedit"; } /** * 修改年级信息 * @param grade * @param request * @return */ @RequestMapping(value="/grade/update/grade", method=RequestMethod.PUT) public String isUpdateGrade(GradeInfo grade, HttpServletRequest request) { logger.info("修改年级 "+grade+" 的信息"); int row = gradeInfoService.isUpdateGrade(grade); if (row < 1) { logger.error("年级修改失败"); request.setAttribute("error", "年级修改失败，请稍后再试！"); return "/error"; } return "redirect:/grades"; } /** * 删除年级 * @param gradeId * @param request * @return */ @RequestMapping(value="grade/del/{gradeId}", method=RequestMethod.DELETE) public String isDelGrade(@PathVariable("gradeId") Integer gradeId, HttpServletRequest request) { logger.info("删除年级 "+gradeId); int row = gradeInfoService.isDelGrade(gradeId); if (row < 1) { logger.error("年级删除失败"); request.setAttribute("error", "年级删除失败，请稍后再试！"); return "/error"; } return "redirect:/grades"; } }

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