Java如何进行食品溯源系统的实现，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
一、项目运行
环境配置：
Jdk1.8 + Tomcat8.5 + Mysql + HBuilderX（Webstorm也行）+ Eclispe（IntelliJ IDEA,Eclispe,MyEclispe,Sts都支持）。
项目技术：
Springboot + Maven + mybatis+ Vue 等等组成，B/S模式 + Maven管理等等。
系统控制器:
@RequestMapping("/system")@Controllerpublic class SystemController { @Autowiredprivate OperaterLogService operaterLogService;@Autowiredprivate UserService userService;@Autowiredprivate DatabaseBakService databaseBakService; @Autowiredprivate StaffService staffService;@Autowiredprivate OrderAuthService orderAuthService; private Logger log = LoggerFactory.getLogger(SystemController.class);@RequestMapping(value="/login",method=RequestMethod.GET)public String login(Model model){model.addAttribute("loginTypes", LoginType.values());return "admin/system/login";}@RequestMapping(value="/login",method=RequestMethod.POST)@ResponseBodypublic Result<Boolean> login(HttpServletRequest request,String username,String password,String cpacha,Integer type){if(StringUtils.isEmpty(username)){return Result.error(CodeMsg.ADMIN_USERNAME_EMPTY);}if(StringUtils.isEmpty(password)){return Result.error(CodeMsg.ADMIN_PASSWORD_EMPTY);} //表示实体信息合法，开始验证验证码是否为空if(StringUtils.isEmpty(cpacha)){return Result.error(CodeMsg.CPACHA_EMPTY);}//说明验证码不为空，从session里获取验证码Object attribute = request.getSession().getAttribute("admin_login");if(attribute == null){return Result.error(CodeMsg.SESSION_EXPIRED);}//表示session未失效，进一步判断用户填写的验证码是否正确if(!cpacha.equalsIgnoreCase(attribute.toString())){return Result.error(CodeMsg.CPACHA_ERROR);} if(type == LoginType.ADMINISTRATOR.getCode()){//表示验证码正确，开始查询数据库，检验密码是否正确User findByUsername = userService.findByUsername(username);//判断是否为空if(findByUsername == null){return Result.error(CodeMsg.ADMIN_USERNAME_NO_EXIST);}//表示用户存在，进一步对比密码是否正确if(!findByUsername.getPassword().equals(password)){return Result.error(CodeMsg.ADMIN_PASSWORD_ERROR);}//表示密码正确，接下来判断用户状态是否可用if(findByUsername.getStatus() == User.ADMIN_USER_STATUS_UNABLE){return Result.error(CodeMsg.ADMIN_USER_UNABLE);}//检查用户所属角色状态是否可用if(findByUsername.getRole() == null || findByUsername.getRole().getStatus() == Role.ADMIN_ROLE_STATUS_UNABLE){return Result.error(CodeMsg.ADMIN_USER_ROLE_UNABLE);}//检查用户所属角色的权限是否存在if(findByUsername.getRole().getAuthorities() == null || findByUsername.getRole().getAuthorities().size() == 0){return Result.error(CodeMsg.ADMIN_USER_ROLE_AUTHORITES_EMPTY);}//检查一切符合，可以登录，将用户信息存放至sessionrequest.getSession().setAttribute(SessionConstant.SESSION_USER_LOGIN_KEY, findByUsername);request.getSession().setAttribute("loginType",type); //销毁session中的验证码request.getSession().setAttribute("admin_login", null);//将登陆记录写入日志库operaterLogService.add("用户【"+username+"】于【" + StringUtil.getFormatterDate(new Date(), "yyyy-MM-dd HH:mm:ss") + "】登录系统！");log.info("用户成功登录，user = " + findByUsername);}else{Staff byJobNumber = staffService.findByNameAndIsStatus(username);//判断是否为空if(byJobNumber == null){return Result.error(CodeMsg.ADMIN_USERNAME_NO_EXIST);} //表示用户存在，进一步对比密码是否正确if(!byJobNumber.getPassword().equals(password)){return Result.error(CodeMsg.ADMIN_PASSWORD_ERROR);} //检查用户所属角色状态是否可用if(byJobNumber.getRole() == null || byJobNumber.getRole().getStatus() == Role.ADMIN_ROLE_STATUS_UNABLE){return Result.error(CodeMsg.ADMIN_USER_ROLE_UNABLE);} //检查用户所属角色的权限是否存在if(byJobNumber.getRole().getAuthorities() == null || byJobNumber.getRole().getAuthorities().size() == 0){return Result.error(CodeMsg.ADMIN_USER_ROLE_AUTHORITES_EMPTY);}//检查一切符合，可以登录，将用户信息存放至sessionrequest.getSession().setAttribute(SessionConstant.SESSION_STAFF_LOGIN_KEY, byJobNumber);request.getSession().setAttribute("loginType",type);//销毁session中的验证码request.getSession().setAttribute("admin_login", null);//将登陆记录写入日志库operaterLogService.add("用户【"+username+"】于【" + StringUtil.getFormatterDate(new Date(), "yyyy-MM-dd HH:mm:ss") + "】登录系统！");log.info("员工成功登录，user = " + byJobNumber);} return Result.success(true);}@RequestMapping(value="/index")public String index(Model model){model.addAttribute("operatorLogs", operaterLogService.findLastestLog(10));model.addAttribute("userTotal", userService.total());model.addAttribute("operatorLogTotal", operaterLogService.total());model.addAttribute("databaseBackupTotal", databaseBakService.total());model.addAttribute("onlineUserTotal", SessionListener.onlineUserCount);return "admin/system/index";}@RequestMapping(value="/logout")public String logout(){Integer loginType = (Integer) SessionUtil.get("loginType");if(loginType == LoginType.ADMINISTRATOR.getCode()){User loginedUser = SessionUtil.getLoginedUser();if(loginedUser != null){SessionUtil.set(SessionConstant.SESSION_USER_LOGIN_KEY, null);}}else if(loginType == LoginType.STAFF.getCode()){Staff loginedStaff = SessionUtil.getLoginedStaff();if(loginedStaff != null){SessionUtil.set(SessionConstant.SESSION_STAFF_LOGIN_KEY,null);}}return "redirect:login";}@RequestMapping(value="/no_right")public String noRight(){return "admin/system/no_right";}@RequestMapping(value="/update_userinfo",method=RequestMethod.GET)public String updateUserInfo(){return "admin/system/update_userinfo";}@RequestMapping(value="/update_userinfo",method=RequestMethod.POST)public String updateUserInfo(User user){User loginedUser = SessionUtil.getLoginedUser();loginedUser.setEmail(user.getEmail());loginedUser.setMobile(user.getMobile());loginedUser.setHeadPic(user.getHeadPic());//首先保存到数据库userService.save(loginedUser);//更新session里的值SessionUtil.set(SessionConstant.SESSION_USER_LOGIN_KEY, loginedUser);return "redirect:update_userinfo";}@RequestMapping(value="/update_pwd",method=RequestMethod.GET)public String updatePwd(){return "admin/system/update_pwd";}@RequestMapping(value="/update_pwd",method=RequestMethod.POST)@ResponseBodypublic Result<Boolean> updatePwd(@RequestParam(name="oldPwd",required=true)String oldPwd,@RequestParam(name="newPwd",required=true)String newPwd){Integer loginType = (Integer) SessionUtil.get("loginType");if(loginType == LoginType.ADMINISTRATOR.getCode()){User loginedUser = SessionUtil.getLoginedUser();if(!loginedUser.getPassword().equals(oldPwd)){return Result.error(CodeMsg.ADMIN_USER_UPDATE_PWD_ERROR);}if(StringUtils.isEmpty(newPwd)){return Result.error(CodeMsg.ADMIN_USER_UPDATE_PWD_EMPTY);}if(newPwd.length()<4 || newPwd.length()>32){return Result.error(CodeMsg.ADMIN_USER_PWD_LENGTH_ERROR);}loginedUser.setPassword(newPwd);//保存数据库userService.save(loginedUser);//更新sessionSessionUtil.set(SessionConstant.SESSION_USER_LOGIN_KEY, loginedUser);}else{Staff loginedStaff = SessionUtil.getLoginedStaff(); Staff staff = staffService.find(loginedStaff.getId());if(!staff.getPassword().equals(oldPwd)){return Result.error(CodeMsg.ADMIN_USER_UPDATE_PWD_ERROR);}if(StringUtils.isEmpty(newPwd)){return Result.error(CodeMsg.ADMIN_USER_UPDATE_PWD_EMPTY);} staff.setPassword(newPwd); CodeMsg codeMsg = ValidateEntityUtil.validate(staff);if (codeMsg.getCode() != CodeMsg.SUCCESS.getCode()){return Result.error(codeMsg);} loginedStaff.setPassword(newPwd);//保存数据库staffService.save(loginedStaff);//更新sessionSessionUtil.set(SessionConstant.SESSION_STAFF_LOGIN_KEY, loginedStaff);} return Result.success(true);}@RequestMapping(value="/operator_log_list")public String operatorLogList(Model model,OperaterLog operaterLog,PageBean<OperaterLog> pageBean){model.addAttribute("pageBean", operaterLogService.findList(operaterLog, pageBean));model.addAttribute("operator", operaterLog.getOperator());model.addAttribute("title", "日志列表");return "admin/system/operator_log_list";}@RequestMapping(value="/auth_order",method=RequestMethod.POST)@ResponseBodypublic Result<Boolean> authOrder(@RequestParam(name="orderSn",required=true)String orderSn,@RequestParam(name="phone",required=true)String phone){ OrderAuth orderAuth = new OrderAuth();orderAuth.setMac(StringUtil.getMac());orderAuth.setOrderSn(orderSn);orderAuth.setPhone(phone);orderAuthService.save(orderAuth);AppConfig.ORDER_AUTH = 1;return Result.success(true);} @RequestMapping(value="/delete_operator_log",method=RequestMethod.POST)@ResponseBodypublic Result<Boolean> delete(String ids){if(!StringUtils.isEmpty(ids)){String[] splitIds = ids.split(",");for(String id : splitIds){operaterLogService.delete(Long.valueOf(id));}}return Result.success(true);}@RequestMapping(value="/delete_all_operator_log",method=RequestMethod.POST)@ResponseBodypublic Result<Boolean> deleteAll(){operaterLogService.deleteAll();return Result.success(true);}}后台用户管理控制器:
@RequestMapping("/admin/user")@Controllerpublic class UserController { @Autowiredprivate UserService userService;@Autowiredprivate RoleService roleService;@Autowiredprivate OperaterLogService operaterLogService;@RequestMapping(value="/list")public String list(Model model,User user,PageBean<User> pageBean){model.addAttribute("title", "用户列表");model.addAttribute("username", user.getUsername());model.addAttribute("pageBean", userService.findList(user, pageBean));return "admin/user/list";}@RequestMapping(value="/add",method=RequestMethod.GET)public String add(Model model){model.addAttribute("roles", roleService.findAll());return "admin/user/add";}@RequestMapping(value="/add",method=RequestMethod.POST)@ResponseBodypublic Result<Boolean> add(User user){//用统一验证实体方法验证是否合法CodeMsg validate = ValidateEntityUtil.validate(user);if(validate.getCode() != CodeMsg.SUCCESS.getCode()){return Result.error(validate);}if(user.getRole() == null || user.getRole().getId() == null){return Result.error(CodeMsg.ADMIN_USER_ROLE_EMPTY);}//判断用户名是否存在if(userService.isExistUsername(user.getUsername(), 0l)){return Result.error(CodeMsg.ADMIN_USERNAME_EXIST);}//到这说明一切符合条件，进行数据库新增if(userService.save(user) == null){return Result.error(CodeMsg.ADMIN_USE_ADD_ERROR);}operaterLogService.add("添加用户，用户名：" + user.getUsername());return Result.success(true);}@RequestMapping(value="/edit",method=RequestMethod.GET)public String edit(Model model,@RequestParam(name="id",required=true)Long id){model.addAttribute("roles", roleService.findAll());model.addAttribute("user", userService.find(id));return "admin/user/edit";}@RequestMapping(value="/edit",method=RequestMethod.POST)@ResponseBodypublic Result<Boolean> edit(User user){//用统一验证实体方法验证是否合法CodeMsg validate = ValidateEntityUtil.validate(user);if(validate.getCode() != CodeMsg.SUCCESS.getCode()){return Result.error(validate);}if(user.getRole() == null || user.getRole().getId() == null){return Result.error(CodeMsg.ADMIN_USER_ROLE_EMPTY);}if(user.getId() == null || user.getId().longValue() <= 0){return Result.error(CodeMsg.ADMIN_USE_NO_EXIST);}if(userService.isExistUsername(user.getUsername(), user.getId())){return Result.error(CodeMsg.ADMIN_USERNAME_EXIST);}//到这说明一切符合条件，进行数据库保存User findById = userService.find(user.getId());//讲提交的用户信息指定字段复制到已存在的user对象中,该方法会覆盖新字段内容BeanUtils.copyProperties(user, findById, "id","createTime","updateTime");if(userService.save(findById) == null){return Result.error(CodeMsg.ADMIN_USE_EDIT_ERROR);}operaterLogService.add("编辑用户，用户名：" + user.getUsername());return Result.success(true);}@RequestMapping(value="/delete",method=RequestMethod.POST)@ResponseBodypublic Result<Boolean> delete(@RequestParam(name="id",required=true)Long id){try {userService.delete(id);} catch (Exception e) {return Result.error(CodeMsg.ADMIN_USE_DELETE_ERROR);}operaterLogService.add("删除用户，用户ID：" + id);return Result.success(true);}}后台角色管理控制器:
@RequestMapping("/admin/role")@Controllerpublic class RoleController { private Logger log = LoggerFactory.getLogger(RoleController.class);@Autowiredprivate MenuService menuService;@Autowiredprivate OperaterLogService operaterLogService;@Autowiredprivate RoleService roleService;@RequestMapping(value="/list")public String list(Model model,Role role,PageBean<Role> pageBean){model.addAttribute("title", "角色列表");model.addAttribute("name", role.getName());model.addAttribute("pageBean", roleService.findByName(role, pageBean));return "admin/role/list";}@RequestMapping(value="/add",method=RequestMethod.GET)public String add(Model model){List<Menu> findAll = menuService.findAll();model.addAttribute("topMenus",MenuUtil.getTopMenus(findAll));model.addAttribute("secondMenus",MenuUtil.getSecondMenus(findAll));model.addAttribute("thirdMenus",MenuUtil.getThirdMenus(findAll));return "admin/role/add";}@RequestMapping(value="/add",method=RequestMethod.POST)@ResponseBodypublic Result<Boolean> add(Role role){//用统一验证实体方法验证是否合法CodeMsg validate = ValidateEntityUtil.validate(role);if(validate.getCode() != CodeMsg.SUCCESS.getCode()){return Result.error(validate);}if(roleService.save(role) == null){return Result.error(CodeMsg.ADMIN_ROLE_ADD_ERROR);}log.info("添加角色【"+role+"】");operaterLogService.add("添加角色【"+role.getName()+"】");return Result.success(true);}@RequestMapping(value="/edit",method=RequestMethod.GET)public String edit(@RequestParam(name="id",required=true)Long id,Model model){List<Menu> findAll = menuService.findAll();model.addAttribute("topMenus",MenuUtil.getTopMenus(findAll));model.addAttribute("secondMenus",MenuUtil.getSecondMenus(findAll));model.addAttribute("thirdMenus",MenuUtil.getThirdMenus(findAll));Role role = roleService.find(id);model.addAttribute("role", role);model.addAttribute("authorities",JSONArray.toJSON(role.getAuthorities()).toString());return "admin/role/edit";}@RequestMapping(value="/edit",method=RequestMethod.POST)@ResponseBodypublic Result<Boolean> edit(Role role){//用统一验证实体方法验证是否合法CodeMsg validate = ValidateEntityUtil.validate(role);if(validate.getCode() != CodeMsg.SUCCESS.getCode()){return Result.error(validate);}Role existRole = roleService.find(role.getId());if(existRole == null){return Result.error(CodeMsg.ADMIN_ROLE_NO_EXIST);}existRole.setName(role.getName());existRole.setRemark(role.getRemark());existRole.setStatus(role.getStatus());existRole.setAuthorities(role.getAuthorities());if(roleService.save(existRole) == null){return Result.error(CodeMsg.ADMIN_ROLE_EDIT_ERROR);}log.info("编辑角色【"+role+"】");operaterLogService.add("编辑角色【"+role.getName()+"】");return Result.success(true);}@RequestMapping(value="delete",method=RequestMethod.POST)@ResponseBodypublic Result<Boolean> delete(@RequestParam(name="id",required=true)Long id){try {roleService.delete(id);} catch (Exception e) {// TODO: handle exceptionreturn Result.error(CodeMsg.ADMIN_ROLE_DELETE_ERROR);}log.info("编辑角色ID【"+id+"】");operaterLogService.add("删除角色ID【"+id+"】");return Result.success(true);}}Java有哪些集合类
Java中的集合主要分为四类：1、List列表：有序的，可重复的；2、Queue队列：有序，可重复的；3、Set集合：不可重复；4、Map映射：无序，键唯一，值不唯一。
看完上述内容，你们掌握Java如何进行食品溯源系统的实现的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注编程网行业资讯频道，感谢各位的阅读！
