标签:ash unicode character varchar img string 企业 date amp
一、介绍
1.springboot是spring项目的总结+整合
当我们搭smm,ssh,ssjdbc等组合框架时,各种配置不胜其烦,不仅是配置问题,在添加各种依赖时也是让人头疼,关键有些jar包之间还会出现冲突,让你的项目出现难以解决的问题。基于这种情况,springboot横空出世,在考虑到Struts控制层框架有漏洞,springboot放弃(大多数企业同样如此)了Struts,转而代之是springMVC,不过,springboot是自动集成springMVC的,不需要任何配置,不需要任何依赖,直接使用各种控制层注解。springboot是springcloud的基础,是开启微服务时代的钥匙。
二、新建springboot工程
1. 使用idea2019新建project,选择spring Initializr,next
2. 填写坐标信息,next
3. Developer Tools选择Lombok, Web选择Spring Web Starter,SQL选择JDBC API、MySQL Driver,next
lombok是为了省去实体类中getter/setter方法,使之在运行时动态添加getter/setter
4. 填写项目名已经存放位置,finish
三、项目构建
1. 数据库准备(两张表,分别是user用户表和phone手机表,且是一对多关系)
create database ssdj; CREATE TABLE `user` ( `id` int(11) NOT NULL AUTO_INCREMENT, `password` varchar(255) DEFAULT NULL, `username` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8; CREATE TABLE `phone` ( `id` int(11) NOT NULL AUTO_INCREMENT, `brand` varchar(255) DEFAULT NULL, `user_id` int(11) DEFAULT NULL, PRIMARY KEY (`id`), KEY `FK_8t3jhwmmlxpq3qcwcy1a3alts` (`user_id`), CONSTRAINT `FK_8t3jhwmmlxpq3qcwcy1a3alts` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8; insert into user(username,password) values(1001,123); insert into phone(brand,user_id) values (‘华为‘,1),(‘iphone‘,1);
2. pom.xml(不用动,默认)
3. 配置文件
application.properties
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver spring.datasource.url=jdbc:mysql://localhost:3306/ssdj?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT spring.datasource.username=root spring.datasource.password=root
数据库连接要添加时区,否则可能会报错
4.项目包结构
分成util、core、entity、dao、service、controller等结构包
5. 需要一个SqlFactory工具类来制造动态SQL语句
package club.xcreeper.springboot_jdbctemplete.util; import java.lang.reflect.Field; import java.util.HashMap; import java.util.Map; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class SqlFactory { private String tableName; public Object[] params; public SqlFactory(Class<?> clazz) { tableName = clazz.getSimpleName().toLowerCase(); } private final static Logger logger = LoggerFactory.getLogger(SqlFactory.class); private Map<String,Object> objectToMap(Object entity) { Field[] fields = entity.getClass().getDeclaredFields(); Map<String,Object> map = new HashMap<String,Object>(); for(Field field : fields) { field.setAccessible(true);//允许访问属性 Object value = null; try { value = field.get(entity); } catch (IllegalArgumentException | IllegalAccessException e) { e.printStackTrace(); } if(value != null) { map.put(field.getName(), value); } } return map; } public String getDeleteSql() { StringBuilder sql = new StringBuilder("delete from ").append(tableName).append(" where id = ?"); logger.info(sql.toString()); return sql.toString(); } public String getSelectOneSql() { StringBuilder sql = new StringBuilder("select * from ").append(tableName).append(" where id = ?"); logger.info(sql.toString()); return sql.toString(); } public String getInsertSql(Object entity) { Map<String,Object> map = this.objectToMap(entity); map.remove("id"); params = new Object[map.size()]; StringBuilder stringBuiler = new StringBuilder("insert into ").append(tableName).append("("); for(String key : map.keySet()) { stringBuiler.append(key).append(","); } stringBuiler.deleteCharAt(stringBuiler.length()-1).append(") values ("); int i = 0; for(String key : map.keySet()) { stringBuiler.append("?,"); params[i] = map.get(key); i++; } stringBuiler.deleteCharAt(stringBuiler.length()-1).append(")"); map = null; logger.info(stringBuiler.toString()); return stringBuiler.toString(); } public String getUpdateSql(Object entity) { Map<String,Object> map = this.objectToMap(entity); params = new Object[map.size()]; params[params.length-1] = map.remove("id"); StringBuilder stringBuiler = new StringBuilder("update ").append(tableName).append(" set "); int i = 0; for(String key : map.keySet()) { stringBuiler.append(key).append("=?,"); params[i] = map.get(key); i++; } stringBuiler.deleteCharAt(stringBuiler.length()-1).append(" where id = ?"); map = null; logger.info(stringBuiler.toString()); return stringBuiler.toString(); } public String getSelectList(Object entity) { Map<String,Object> map = this.objectToMap(entity); map.remove("id"); params = new Object[map.size()]; StringBuilder stringBuiler = new StringBuilder("select * from ").append(tableName).append(" where "); int i = 0; for(String key : map.keySet()) { stringBuiler.append(key).append("=? and "); params[i] = map.get(key); i++; } stringBuiler.delete(stringBuiler.length()-4, stringBuiler.length()); map = null; logger.info(stringBuiler.toString()); return stringBuiler.toString(); } }
6.需要有一个通用的Dao接口及实现类来完成核心操作
package club.xcreeper.springboot_jdbctemplete.Core.dao; import java.io.Serializable; import java.util.List; public interface CoreDao<T> { int insert(T t); int delete(Serializable id); int update(T t); T getOne(Serializable id); List<T> getList(T t); }
package club.xcreeper.springboot_jdbctemplete.Core.dao.impl; import club.xcreeper.springboot_jdbctemplete.Core.dao.CoreDao; import club.xcreeper.springboot_jdbctemplete.util.SqlFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.BeanPropertyRowMapper; import org.springframework.jdbc.core.JdbcTemplate; import java.io.Serializable; import java.lang.reflect.ParameterizedType; import java.util.List; public class CoreDaoImpl<T> implements CoreDao<T> { private Class<T> clazz; private SqlFactory sqlFactory; @SuppressWarnings("unchecked") public CoreDaoImpl() { this.clazz = (Class<T>)((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0]; sqlFactory = new SqlFactory(this.clazz); } @Autowired private JdbcTemplate jdbcTemplate; @Override public int insert(T t) { return jdbcTemplate.update(sqlFactory.getInsertSql(t),sqlFactory.params); } @Override public int delete(Serializable id) { return jdbcTemplate.update(sqlFactory.getDeleteSql(),id); } @Override public int update(T t) { return jdbcTemplate.update(sqlFactory.getUpdateSql(t),sqlFactory.params); } @Override public T getOne(Serializable id) { return jdbcTemplate.queryForObject(sqlFactory.getSelectOneSql(),new BeanPropertyRowMapper<T>(this.clazz),id); } @Override public List<T> getList(T t) { return jdbcTemplate.query(sqlFactory.getSelectList(t),new BeanPropertyRowMapper<T>(this.clazz),sqlFactory.params); } }
7. 实体类
package club.xcreeper.springboot_jdbctemplete.entity; import lombok.Getter; import lombok.Setter; import lombok.ToString; @ToString public class User { @Setter @Getter private Integer id; @Setter @Getter private String username; @Setter @Getter private String password; }
package club.xcreeper.springboot_jdbctemplete.entity; import lombok.Getter; import lombok.Setter; import lombok.ToString; @ToString public class Phone { @Getter@Setter private Integer id; @Getter@Setter private String brand; @Getter@Setter private Integer user_id; }
8. dao接口及其实现,只需继承核心dao即可
package club.xcreeper.springboot_jdbctemplete.dao; import club.xcreeper.springboot_jdbctemplete.Core.dao.CoreDao; import club.xcreeper.springboot_jdbctemplete.entity.User; public interface UserDao extends CoreDao<User> { }
package club.xcreeper.springboot_jdbctemplete.dao; import club.xcreeper.springboot_jdbctemplete.Core.dao.CoreDao; import club.xcreeper.springboot_jdbctemplete.entity.Phone; public interface PhoneDao extends CoreDao<Phone> { }
package club.xcreeper.springboot_jdbctemplete.dao.impl; import club.xcreeper.springboot_jdbctemplete.Core.dao.impl.CoreDaoImpl; import club.xcreeper.springboot_jdbctemplete.dao.UserDao; import club.xcreeper.springboot_jdbctemplete.entity.User; import org.springframework.stereotype.Repository; @Repository public class UserDaoImpl extends CoreDaoImpl<User> implements UserDao { }
package club.xcreeper.springboot_jdbctemplete.dao.impl; import club.xcreeper.springboot_jdbctemplete.Core.dao.impl.CoreDaoImpl; import club.xcreeper.springboot_jdbctemplete.dao.PhoneDao; import club.xcreeper.springboot_jdbctemplete.entity.Phone; import org.springframework.stereotype.Repository; @Repository public class PhoneDaoImpl extends CoreDaoImpl<Phone> implements PhoneDao { }
9. service接口及其实现
package club.xcreeper.springboot_jdbctemplete.service; import club.xcreeper.springboot_jdbctemplete.entity.User; import java.util.List; public interface UserService { int insert(User user); int delete(int id); int update(User user); User getOne(int id); List<User> getList(User user); }
package club.xcreeper.springboot_jdbctemplete.service; import club.xcreeper.springboot_jdbctemplete.entity.Phone; import java.util.List; public interface PhoneService { int insert(Phone phone); int delete(int id); int update(Phone phone); Phone getOne(int id); List<Phone> getList(Phone phone); }
package club.xcreeper.springboot_jdbctemplete.service.impl; import club.xcreeper.springboot_jdbctemplete.dao.UserDao; import club.xcreeper.springboot_jdbctemplete.entity.User; import club.xcreeper.springboot_jdbctemplete.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; @Service public class UserServiceImpl implements UserService { @Autowired private UserDao userDao; @Override public int insert(User user) { return userDao.insert(user); } @Override public int delete(int id) { return userDao.delete(id); } @Override public int update(User user) { return userDao.update(user); } @Override public User getOne(int id) { return userDao.getOne(id); } @Override public List<User> getList(User user) { return userDao.getList(user); } }
package club.xcreeper.springboot_jdbctemplete.service.impl; import club.xcreeper.springboot_jdbctemplete.dao.PhoneDao; import club.xcreeper.springboot_jdbctemplete.entity.Phone; import club.xcreeper.springboot_jdbctemplete.service.PhoneService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; @Service public class PhoneServiceImpl implements PhoneService { @Autowired private PhoneDao phoneDao; @Override public int insert(Phone phone) { return phoneDao.insert(phone); } @Override public int delete(int id) { return phoneDao.delete(id); } @Override public int update(Phone phone) { return phoneDao.update(phone); } @Override public Phone getOne(int id) { return phoneDao.getOne(id); } @Override public List<Phone> getList(Phone phone) { return phoneDao.getList(phone); } }
10. controller
package club.xcreeper.springboot_jdbctemplete.controller; import club.xcreeper.springboot_jdbctemplete.entity.User; import club.xcreeper.springboot_jdbctemplete.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.List; @RestController @RequestMapping("/user") public class UserController { @Autowired private UserService userService; @GetMapping(value = "/{id}") public User getOne(@PathVariable int id) { return userService.getOne(id); } @GetMapping(params = {"username","password","username!=","password!="}) public List<User> getList(User user) { return userService.getList(user); } }
11. 启动项目,并用postman测试接口
javaweb各种框架组合案例(七):springboot+jdbcTemplete+通用dao+restful
标签:ash unicode character varchar img string 企业 date amp
原文地址:https://www.cnblogs.com/xiaogblog/p/11134938.html