spring+springmvc+mybatis 开发JAVA单体应用

时间：2020-11-07 21:53:24|栏目：JAVA代码|点击：次

myshop 概述

myshop项目是根据视频教程 Java 单体应用做的一个练习项目，目前完成了登录功能、用户管理、类别管理后续有时间会继续做其它的功能。趁着双11花了99元一年买了台阿里云服务器，演示地址>> myshop

项目地址 https://gitee.com/yehuabin/myshop

项目结构

my-shop-dependencies：管理jar包的版本，所有项目依赖此项目

my-shop-commons：项目通用工具、实体类

my-shop-domain: POJO类，对于数据库一张表

my-shop-web-admin：后台管理功能

my-shop-web-api、my-shop-web-ui：商城前端展示部分，目前还没开发

BaseDao

public interface BaseDao<T> {
 int create(T model);
 int update(T model);
 int delete(int id);
 T getById(int id);
}

BaseDao定义了通用的数据操作接口其它具体的操作接口都继承该dao

public interface TbUserDao extends BaseDao<TbUser> {
 TbUser getByUserNameAndPasswrod(Map<String,String> param);
 List<TbUser> getByPage(PageQuery<TbUserQuery> pageQuery);
 int getCount(PageQuery<TbUserQuery> pageQuery);
}

TbUserDao继承BaseDao并定义了自己特有的一些接口

BaseService

public interface BaseService<T extends BaseEntity> {
 BaseResult create(T model);
 T getById(int id);
 BaseResult update(T model);
 BaseResult delete(int id);
}

BaseService定义通用的服务接口，T 就是某个具体的domain对象

然后给这个通用服务接口定义一个通用的实现 BaseServiceImpl。实现通用的CRUD

public abstract class BaseServiceImpl<T extends BaseEntity,D extends BaseDao<T>> implements BaseService<T> {
 @Autowired
 protected D dao;
 @Override
 public BaseResult create(T model) {
  BaseResult baseResult = EntityValidator.validate(model);
  if (!baseResult.isSuccess()) {
   return baseResult;
  }
  model.setCreated(new Date());
  model.setUpdated(new Date());
  return getBaseResult(dao.create(model),"新增失败");
 }
 public T getById(int id) {
  return dao.getById(id);
 }
 public BaseResult update(T model)
 {
  BaseResult baseResult = EntityValidator.validate(model);
  if (!baseResult.isSuccess()) {
   return baseResult;
  }
  model.setUpdated(new Date());
  return getBaseResult(dao.update(model),"更新失败");
 }
 public BaseResult delete(int id) {
  return getBaseResult(dao.delete(id),"删除失败");
 }
 private BaseResult getBaseResult(int row,String error){
  BaseResult baseResult = BaseResult.success();
  if(row<=0){
   baseResult=BaseResult.fail(error);
  }
  return baseResult;
 }
}

用户服务继承BaseService并扩展了两个方法

public interface UserService extends BaseService<TbUser> {
  PageResult<TbUser> getByPage(PageQuery<TbUserQuery> pageQuery);
  TbUser login(String userName, String password);
}

用户服务的具体实现

@Service
public class UserServiceImpl extends BaseServiceImpl<TbUser,TbUserDao> implements UserService {
 @Override
 public BaseResult create(TbUser tbUser) {
  if (StringUtils.isBlank(tbUser.getPassword())) {
   return BaseResult.fail("密码不能为空");
  }
  tbUser.setPassword(md5DigestAsHex(tbUser.getPassword()));
  return super.create(tbUser);
 }
 @Override
 public PageResult<TbUser> getByPage(PageQuery<TbUserQuery> pageQuery) {
  PageResult<TbUser> result = new PageResult<>();
  List<TbUser> list = dao.getByPage(pageQuery);
  int count=dao.getCount(pageQuery);
  result.setData(list);
  result.setRecordsTotal(count);
  result.setRecordsFiltered(count);
  return result;
 }
 @Override
 public BaseResult update(TbUser tbUser) {
  if (StringUtils.isNotBlank(tbUser.getPassword())) {
   tbUser.setPassword(md5DigestAsHex(tbUser.getPassword()));
  }
  return super.update(tbUser);
 }
 @Override
 public TbUser login(String userName, String password) {
  Map<String, String> param = new HashMap<>();
  param.put("userName", userName);
  param.put("password", md5DigestAsHex(password));
  System.out.println(param.get("password"));
  return dao.getByUserNameAndPasswrod(param);
 }
 private String md5DigestAsHex(String password){
  return DigestUtils.md5DigestAsHex(password.getBytes());
 }
}

BaseController

BaseController定义了通用的列表页、表单页、删除操作的跳转

public abstract class BaseController<T extends BaseEntity,S extends BaseService<T>> {
 @Autowired
 protected S service;
 @ModelAttribute
 public T getModel(Integer id) {
  T model=initFormEntity();
  if (id != null && id > 0) {
   model = service.getById(id);
  }
  return model;
 }
 @RequestMapping("/list")
 public String list(Model model) {
  return getJspPath()+"/list";
 }
 @RequestMapping(value = {"/create", "edit"}, method = RequestMethod.GET)
 public String form() {
  return getJspPath()+"/form";
 }
 @RequestMapping("/detail")
 public String detail() {
  return getJspPath()+"/detail";
 }
 @ResponseBody
 @RequestMapping("/delete")
 public BaseResult delete(int id) {
  return service.delete(id);
 }
 @RequestMapping(value = {"/create", "edit"}, method = RequestMethod.POST)
 public String form(T entity, Model model) {
  BaseResult baseResult;
  if (entity.getId() != null && entity.getId() > 0) {
   baseResult = service.update(entity);
  } else {
   baseResult = service.create(entity);
  }
  //新增或者修改成功返回列表页
  if (baseResult.isSuccess()) {
   return "redirect:list";
  }
  //失败显示错误信息
  model.addAttribute("result", baseResult);
  return getJspPath()+"/form";
 }
 protected abstract T initFormEntity();
 protected String getJspPath(){
  return getClass().getSimpleName().toLowerCase().replace("controller","");
 }
}

任何其它模块只要继承BaseController，就可以自动跳转到列表、表单、删除等页面，可以大大减少代码量

具体的UserController只需要实现特有的业务逻辑就可以

@Controller
@RequestMapping("/user")
public class UserController extends BaseController<TbUser,UserService> {
 @ResponseBody
 @RequestMapping("/page")
 public PageResult<TbUser> page(PageQuery<TbUserQuery> pageQuery, TbUserQuery query) {
  pageQuery.setQuery(query);
  PageResult<TbUser> tbUsers = service.getByPage(pageQuery);
  return tbUsers;
 }
 @Override
 protected TbUser initFormEntity() {
  return new TbUser();
 }
}

总结

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