整合Spring-SpringMVC-MyBatis实现简单前后端交互
(1)环境要求
IDEA
MySQL
Tomcat
Maven
(2)数据库环境
id name pwd
1 Hunter 12
2 Nexa 34
3 Kennys 56
4 Niko 78
(3)SSM基本环境搭建
1.新建Maven项目,项目添加Web app支持
2.在pom.xml中导入相关依赖
junit
junit
4.12
test
mysql
mysql-connector-java
8.0.22
com.mchange
c3p0
0.9.5.2
javax.servlet
servlet-api
2.5
provided
javax.servlet.jsp
jsp-api
2.2
provided
javax.servlet
jstl
1.2
org.mybatis
mybatis
3.5.6
org.mybatis
mybatis-spring
2.0.5
org.springframework
spring-webmvc
5.2.10.RELEASE
org.springframework
spring-jdbc
5.2.10.RELEASE
org.projectlombok
lombok
1.18.12
provided
3.Maven资源过滤问题设置
src/main/java
**/*.properties
**/*.xml
false
src/main/resources
**/*.properties
**/*.xml
false
4.搭建基本结构和框架配置
org.hac.controller
org.hac.pojo
org.hac.dao
org.hac.service
applicationContext.xml(Spring核心配置文件)
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
(4)Mybatis层编写
1.数据库配置文件 database.properties
jdbc.driver=com.mysql.cj.jdbc.Driver
#jdbc.serverTimezone=UTC
jdbc.url=jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=hac0207
2.IDEA关联数据库
关联数据库
3.编写mybatis-config.xml
/p>
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
4.编写具体的接口、类、Mapper配置文件(分Dao层和Servcie层)
1)编写数据库对应的实体类
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private int id;
private String name;
private String pwd;
}
2)定义dao层的Mapper接口
public interface UserMapper {
void addUser(User user);
void deleteUser(int id);
void updateUser(User user);
List selectUser();
User selectUserById(int id);
}
3)编写接口对应的Mapper.xml文件
/p>
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
insert into user (id,name,pwd) values (#{id},#{name},#{pwd})
delete from user where id=#{id}
update user set name=#{name},pwd=#{pwd} where id=#{id}
select * from user
select * from user where id=#{id};
4)编写Service层的接口和实现类
public interface UserService {
void addUser(User user);
void deleteUser(int id);
void updateUser(User user);
List selectUser();
User selectUserById(int id);
}
public class UserServiceImpl implements UserService {
private UserMapper userMapper;
public void setUserMapper(UserMapper userMapper) {
this.userMapper = userMapper;
}
public void addUser(User user) {
userMapper.addUser(user);
}
public void deleteUser(int id) {
userMapper.deleteUser(id);
}
public void updateUser(User user) {
userMapper.updateUser(user);
}
public List selectUser() {
return userMapper.selectUser();
}
public User selectUserById(int id) {
return userMapper.selectUserById(id);
}
}
(5)Spring层编写
1.配置Spring整合Mybatis,数据源使用c3p0连接池;
2.编写Spring整合Mybatis的相关的配置文件:Spring-dao.xml
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
3.Spring整合Service层
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd">
(6)SpringMVC层编写
Spring配置中说明
在XML中配置了这个标签后,spring可以自动扫描base-package下面或者子包下面的java文件,如果扫描有@Component @Service @Controller等这些注解的类,则把这些类注册为bean。
1.web.xml配置文件
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
DispatcherServlet
org.springframework.web.servlet.DispatcherServlet
contextConfigLocation
classpath:applicationContext.xml
1
DispatcherServlet
/
endcodingFilter
org.springframework.web.filter.CharacterEncodingFilter
endcoding
utf-8
endcodingFilter
/*
15
2.spring-mvc.xml配置文件
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
3.Spring配置整合文件:applicationContext.xml
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
(7)Controller编写
1.UserController编写
@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
@Qualifier("userServiceImpl")
private UserServiceImpl userService;
@RequestMapping("/selectUser")
public String selectUser(Model model){
List users=userService.selectUser();
model.addAttribute("msg",users);
return "user";
}
}
(8)起始页和跳转页编写
1.编写首页index.jsp
首页这是首页
2.检索成员的跳转页user.jsp
User${msg}
(9)配置Tomcat测试
起始页
跳转页
(10)问题排查
1.资源过滤问题
src/main/java
**/*.properties
**/*.xml
false
src/main/resources
**/*.properties
**/*.xml
false
2.需要检查target目录中是否缺少配置文件,必要时手动添加
3.运行Tomcat前检查项目设置中的Artifacts中是否导入了相关的jar包
4.MySQL8.0以上版本中,配置文件database.properties中设置应多"jc"和注意时区设置
jdbc.driver=com.mysql.cj.jdbc.Driver
5.spring-dao配置文件中关联数据库配置文件中路径设置要加上classpath:
(11)SSM搭建思维导图
项目目录
思维导图
以上;
懂了吗,那就去用SpringBoot吧doge~~