SpringBoot（四）：SpringBoot整合JdbcTemplate

个人其实偏向于使用类似于JdbcTemplate这种的框架，返回数据也习惯于接受Map/List形式，而不是转化成对象，一是前后台分离转成json方便，另外是返回数据格式，数据字段可以通过SQL控制，而不是返回整个对象字段数据，或者通过VO方式。当然更多人习惯于采用Bean形式，所以这里也同样使用Bean.

一、数据准备

CREATE TABLE `tb_user` (  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'ID',  `username` varchar(50) NOT NULL COMMENT '用户名',  `age` int(11) NOT NULL COMMENT '年龄',  `ctm` datetime NOT NULL COMMENT '创建时间',  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8

INSERT INTO `db_test`.`tb_user` (`username`, `age`, `ctm`) VALUES('张三', '18', NOW()) ;INSERT INTO `db_test`.`tb_user` (`username`, `age`, `ctm`) VALUES('李四', '20', NOW()) ;INSERT INTO `db_test`.`tb_user` (`username`, `age`, `ctm`) VALUES('王五', '19', NOW()) ;

二、引入依赖

<!-- jdbcTemplate --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><!-- MySQL连接 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency>

另外web依赖也需要，因为我们采用MVC模式。

<!-- Add typical dependencies for a web application --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency>

三、数据库配置文件

一如既往，我们采用yaml文件配置，当然properties文件也是一样。

注意点，SpringBoot默认采用tomcat-jdbc连接池，如果需要C3P0，DBCP，Druid等作为连接池，需要加入相关依赖以及配置，这里不作说明，采用默认配置即可。

spring:  datasource:    driver-class-name: com.mysql.jdbc.Driver    url: jdbc:mysql://localhost:3306/db_user    username: root    password: root

四、代码

项目结构如下：

实体类User.class

package cn.saytime.bean;import java.util.Date;/** * @ClassName cn.saytime.bean.User * @Description * @date 2017-07-04 22:47:28 */public class User {private int id;private String username;private int age;private Date ctm;public User() {}public User(String username, int age) {this.username = username;this.age = age;this.ctm = new Date();}// Getter、Setter}

UserDao.class

package cn.saytime.dao;import cn.saytime.bean.User;import java.util.List;/** * @ClassName cn.saytime.dao.UserDao * @Description * @date 2017-07-04 22:48:45 */public interface UserDao {User getUserById(Integer id);public List<User> getUserList();public int add(User user);public int update(Integer id, User user);public int delete(Integer id);}

UserDaoImpl.class

package cn.saytime.dao.impl;import cn.saytime.bean.User;import cn.saytime.dao.UserDao;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.jdbc.core.BeanPropertyRowMapper;import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.stereotype.Repository;import java.util.Date;import java.util.List;/** * @ClassName cn.saytime.dao.impl.UserDaoImpl * @Description * @date 2017-07-04 22:50:07 */@Repositorypublic class UserDaoImpl implements UserDao {@Autowiredprivate JdbcTemplate jdbcTemplate;@Overridepublic User getUserById(Integer id) {List<User> list = jdbcTemplate.query("select * from tb_user where id = ?", new Object[]{id}, new BeanPropertyRowMapper(User.class));if(list!=null && list.size()>0){return list.get(0);}else{return null;}}@Overridepublic List<User> getUserList() {List<User> list = jdbcTemplate.query("select * from tb_user", new Object[]{}, new BeanPropertyRowMapper(User.class));if(list!=null && list.size()>0){return list;}else{return null;}}@Overridepublic int add(User user) {return jdbcTemplate.update("insert into tb_user(username, age, ctm) values(?, ?, ?)",user.getUsername(),user.getAge(), new Date());}@Overridepublic int update(Integer id, User user) {return jdbcTemplate.update("UPDATE tb_user SET username = ? , age = ? WHERE id=?",user.getUsername(),user.getAge(), id);}@Overridepublic int delete(Integer id) {return jdbcTemplate.update("DELETE from tb_user where id = ? ",id);}}

UserService.class

package cn.saytime.service;import cn.saytime.bean.User;import org.springframework.stereotype.Service;import java.util.List;/** * @ClassName cn.saytime.service.UserService * @Description * @date 2017-07-04 22:49:05 */public interface UserService {User getUserById(Integer id);public List<User> getUserList();public int add(User user);public int update(Integer id, User user);public int delete(Integer id);}

UserServiceimpl.class

package cn.saytime.service.impl;import cn.saytime.bean.User;import cn.saytime.dao.UserDao;import cn.saytime.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import java.util.List;/** * @ClassName cn.saytime.service.impl.UserServiceImpl * @Description * @date 2017-07-04 22:49:27 */@Servicepublic class UserServiceImpl implements UserService {@Autowiredprivate UserDao userDao;@Overridepublic User getUserById(Integer id) {return userDao.getUserById(id);}@Overridepublic List<User> getUserList() {return userDao.getUserList();}@Overridepublic int add(User user) {return userDao.add(user);}@Overridepublic int update(Integer id, User user) {return userDao.update(id, user);}@Overridepublic int delete(Integer id) {return userDao.delete(id);}}

JsonResult.class 通用json返回类

package cn.saytime.bean;public class JsonResult {private String status = null;private Object result = null;public JsonResult status(String status) {this.status = status;return this;}// Getter Setter}

UserController.class（Restful风格）

package cn.saytime.web;import cn.saytime.bean.JsonResult;import cn.saytime.bean.User;import cn.saytime.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.http.HttpStatus;import org.springframework.http.ResponseEntity;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;import java.util.List;/** * @ClassName cn.saytime.web.UserController * @Description * @date 2017-07-04 22:46:14 */@RestControllerpublic class UserController {@Autowiredprivate UserService userService;/** * 根据ID查询用户 * @param id * @return */@RequestMapping(value = "user/{id}", method = RequestMethod.GET)public ResponseEntity<JsonResult> getUserById (@PathVariable(value = "id") Integer id){JsonResult r = new JsonResult();try {User user = userService.getUserById(id);r.setResult(user);r.setStatus("ok");} catch (Exception e) {r.setResult(e.getClass().getName() + ":" + e.getMessage());r.setStatus("error");e.printStackTrace();}return ResponseEntity.ok(r);}/** * 查询用户列表 * @return */@RequestMapping(value = "users", method = RequestMethod.GET)public ResponseEntity<JsonResult> getUserList (){JsonResult r = new JsonResult();try {List<User> users = userService.getUserList();r.setResult(users);r.setStatus("ok");} catch (Exception e) {r.setResult(e.getClass().getName() + ":" + e.getMessage());r.setStatus("error");e.printStackTrace();}return ResponseEntity.ok(r);}/** * 添加用户 * @param user * @return */@RequestMapping(value = "user", method = RequestMethod.POST)public ResponseEntity<JsonResult> add (@RequestBody User user){JsonResult r = new JsonResult();try {int orderId = userService.add(user);if (orderId < 0) {r.setResult(orderId);r.setStatus("fail");} else {r.setResult(orderId);r.setStatus("ok");}} catch (Exception e) {r.setResult(e.getClass().getName() + ":" + e.getMessage());r.setStatus("error");e.printStackTrace();}return ResponseEntity.ok(r);}/** * 根据id删除用户 * @param id * @return */@RequestMapping(value = "user/{id}", method = RequestMethod.DELETE)public ResponseEntity<JsonResult> delete (@PathVariable(value = "id") Integer id){JsonResult r = new JsonResult();try {int ret = userService.delete(id);if (ret < 0) {r.setResult(ret);r.setStatus("fail");} else {r.setResult(ret);r.setStatus("ok");}} catch (Exception e) {r.setResult(e.getClass().getName() + ":" + e.getMessage());r.setStatus("error");e.printStackTrace();}return ResponseEntity.ok(r);}/** * 根据id修改用户信息 * @param user * @return */@RequestMapping(value = "user/{id}", method = RequestMethod.PUT)public ResponseEntity<JsonResult> update (@PathVariable("id") Integer id, @RequestBody User user){JsonResult r = new JsonResult();try {int ret = userService.update(id, user);if (ret < 0) {r.setResult(ret);r.setStatus("fail");} else {r.setResult(ret);r.setStatus("ok");}} catch (Exception e) {r.setResult(e.getClass().getName() + ":" + e.getMessage());r.setStatus("error");e.printStackTrace();}return ResponseEntity.ok(r);}}

五、测试

GET http://localhost:8080/users 获取用户列表 

GET http://localhost:8080/user/{id} 根据ID获取用户信息 

POST http://localhost:8080/user 添加用户（注意提交格式以及内容） 

PUT http://localhost:8080/user/{id} 根据ID修改用户信息 

再次查询所有用户信息

DELETE http://localhost:8080/user/{id} 根据ID删除用户

 

最终用户数据

 

测试结果通过，ok