本文主要是介绍项目实战：新增@Controller和@Service@Repository@Autowire四个注解，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
1、@Controller
package com.csdn.mymvc.annotation; import java.lang.annotation.*; @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Inherited public @interface Controller { }2、@Service
package com.csdn.mymvc.annotation; import java.lang.annotation.*; @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Inherited public @interface Service { }3、@Repository
package com.csdn.mymvc.annotation; import java.lang.annotation.*; @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Inherited public @interface Repository { }4、@Autowire
package com.csdn.mymvc.annotation; import java.lang.annotation.*; @Target(ElementType.FIELD) @Retention(RetentionPolicy.RUNTIME) @Inherited public @interface Autowire { }
1、FruitController
package com.csdn.fruit.servlet; import com.csdn.fruit.dto.PageInfo; import com.csdn.fruit.dto.PageQueryParam; import com.csdn.fruit.dto.Result; import com.csdn.fruit.pojo.Fruit; import com.csdn.fruit.service.FruitService; import com.csdn.fruit.util.RequestUtil; import com.csdn.fruit.util.ResponseUtil; import com.csdn.mymvc.annotation.*; import jakarta.servlet.ServletException; import jakarta.servlet.http.HttpServletRequest; import jakarta.servlet.http.HttpServletResponse; import java.io.IOException; @Controller @RequestMapping("/fruit") public class FruitController {@Autowireprivate FruitService fruitService;@GetMapping("/index")protected void index(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {Integer pageNo = 1;String pageNoStr = req.getParameter("pageNo");if (pageNoStr != null && !"".equals(pageNoStr)) {pageNo = Integer.parseInt(pageNoStr);}String keyword = "";String keywordStr = req.getParameter("keyword");if (keywordStr != null) {keyword = keywordStr;}PageQueryParam pageQueryParam = new PageQueryParam(pageNo, 5, keyword);PageInfo<Fruit> pageInfo = fruitService.getFruitPageInfo(pageQueryParam);Result result = Result.OK(pageInfo);ResponseUtil.print(resp, result);}@PostMapping("/add")protected void add(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {Fruit fruit = (Fruit) RequestUtil.readObject(req, Fruit.class);fruitService.addFruit(fruit);ResponseUtil.print(resp, Result.OK());}@GetMapping("/del")protected void del(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {Integer fid = Integer.parseInt(req.getParameter("fid"));fruitService.delFruit(fid);ResponseUtil.print(resp, Result.OK());}@GetMapping("/edit")protected void edit(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {Integer fid = Integer.parseInt(req.getParameter("fid"));Fruit fruit = fruitService.getFruitById(fid);ResponseUtil.print(resp, Result.OK(fruit));}@GetMapping("/getFname")public void getFname(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String fname = req.getParameter("fname");Fruit fruit = fruitService.getFruitByFname(fname);ResponseUtil.print(resp, fruit == null ? Result.OK() : Result.Fail());}@PostMapping("/update")protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {Fruit fruit = (Fruit) RequestUtil.readObject(req, Fruit.class);fruitService.updateFruit(fruit);ResponseUtil.print(resp, Result.OK());} }2、FruitServiceImpl
package com.csdn.fruit.service.impl; import com.csdn.fruit.dao.FruitDao; import com.csdn.fruit.dto.PageInfo; import com.csdn.fruit.dto.PageQueryParam; import com.csdn.fruit.pojo.Fruit; import com.csdn.fruit.service.FruitService; import com.csdn.mymvc.annotation.Autowire; import com.csdn.mymvc.annotation.Service; import java.util.List; @Service public class FruitServiceImpl implements FruitService {@Autowireprivate FruitDao fruitDao ;@Overridepublic PageInfo<Fruit> getFruitPageInfo(PageQueryParam pageQueryParam) {Integer pageNo = pageQueryParam.getPageNo();Integer pageSize = pageQueryParam.getPageSize();String keyword = pageQueryParam.getKeyword();List<Fruit> fruitList = fruitDao.getFruitList(pageNo, pageSize, keyword);Integer recordCount = fruitDao.getRecordCount(pageQueryParam.getKeyword());PageInfo<Fruit> fruitPageInfo = new PageInfo<>(fruitList, pageNo, recordCount);return fruitPageInfo;}@Overridepublic void addFruit(Fruit fruit) {if (fruitDao.getFruitByFname(fruit.getFname()) == null) {fruitDao.addFruit(fruit);}}@Overridepublic void updateFruit(Fruit fruit) {fruitDao.updateFruit(fruit);}@Overridepublic void delFruit(Integer fid) {fruitDao.delFruitByFid(fid);}@Overridepublic Fruit getFruitById(Integer fid) {return fruitDao.getFruitByFid(fid);}@Overridepublic Fruit getFruitByFname(String fname) {return fruitDao.getFruitByFname(fname);} }3、FruitDaoImpl
package com.csdn.fruit.dao.impl; import com.csdn.fruit.dao.FruitDao; import com.csdn.fruit.pojo.Fruit; import com.csdn.mymvc.annotation.Repository; import com.csdn.mymvc.dao.BaseDao; import java.util.List; @Repository public class FruitDaoImpl extends BaseDao<Fruit> implements FruitDao {@Overridepublic void addFruit(Fruit fruit) {String sql = "insert into t_fruit values (0,?,?,?,?)";super.executeUpdate(sql, fruit.getFname(), fruit.getPrice(), fruit.getFcount(), fruit.getRemark());}@Overridepublic void delFruit(String fname) {String sql = "delete from t_fruit where fname=?";super.executeUpdate(sql, fname);}//通过 fid 删除水果库存记录@Overridepublic void delFruitByFid(Integer fid) {super.executeUpdate("delete from t_fruit where fid = ? ", fid);}//通过 fid 可以修改所有的属性值@Overridepublic void updateFruit(Fruit fruit) {String sql = "update t_fruit set fname=?,price=?,fcount=?,remark=? where fid = ?";super.executeUpdate(sql, fruit.getFname(), fruit.getPrice(), fruit.getFcount(), fruit.getRemark(), fruit.getFid());}@Overridepublic List<Fruit> getFruitList() {return super.executeQuery("select * from t_fruit");}@Overridepublic List<Fruit> getFruitList(Integer pageNo, Integer pageSize) {return super.executeQuery("select * from t_fruit limit ?,?", (pageNo - 1) * pageSize, pageSize);}@Overridepublic List<Fruit> getFruitList(Integer pageNo, Integer pageSize, String keyword) {return super.executeQuery("select * from t_fruit where fname like ? or remark like? limit ?,?", "%" + keyword + "%", "%" + keyword + "%", (pageNo - 1) * pageSize, pageSize);}@Overridepublic Fruit getFruitByFname(String fname) {return load("select * from t_fruit where fname = ?", fname);}@Overridepublic Fruit getFruitByFid(Integer fid) {return load("select * from t_fruit where fid=?", fid);}@Overridepublic Integer getRecordCount() {String sql = "select count(*) from t_fruit";return ((Long) executeComplexQuery(sql).get(0)[0]).intValue();}@Overridepublic Integer getRecordCount(String keyword) {String sql = "select count(*) from t_fruit where fname like ? or remark like ? ";return ((Long) executeComplexQuery(sql, "%" + keyword + "%", "%" + keyword + "%").get(0)[0]).intValue();} }
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