SpringBoot整合SSM项目

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SpringBoot整合SSM项目
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1.1.1 系统架构图

1.1.2 创建数据库表
创建mybatisdb数据库，设置utf8字符集。

创建user表：

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`user_id` int(11) NOT NULL AUTO_INCREMENT COMMENT '用户id',
`user_name` varchar(100) COLLATE utf8mb4_bin NOT NULL DEFAULT '' COMMENT '用户名',
`birthday` bigint(20) NOT NULL DEFAULT '0' COMMENT '生日',
`address` varchar(200) COLLATE utf8mb4_bin NOT NULL DEFAULT '' COMMENT '住址',
`create_time` bigint(20) NOT NULL DEFAULT '0' COMMENT '创建时间',
`update_time` bigint(20) NOT NULL DEFAULT '0' COMMENT '更新时间',
`create_by` varchar(64) COLLATE utf8mb4_bin NOT NULL DEFAULT '' COMMENT '创建者ID或名称',
`update_by` varchar(64) COLLATE utf8mb4_bin NOT NULL DEFAULT '' COMMENT '更新者ID或名称',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=56 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin COMMENT='商品品牌';

insert into `user`(`user_name`,`birthday`,`address`,`create_time`,`create_by`) values
('张三',1546393586074,'桂州村', 1546393586074, 'admin'),
('李四',1546393586074,'王府井', 1546393586074, 'admin');
1.1.3 创建SpringBoot工程，创建simple project，类型为jar

1.1.4 pom.xml
额外需要的jar，还得自己依赖，例如：mysql驱动包，阿里的数据源druid包

pasting

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.2.RELEASE</version>
<relativePath/> 
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Spring Boot整合SSM</description>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<mybatis-plus.version>2.1.9</mybatis-plus.version>
<druid.version>1.1.5</druid.version>
</properties>

<dependencies>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${druid.version}</version>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>
1.1.5 User.java
```
package com.example.demo.entity;

import lombok.Data;

import java.io.Serializable;

@Data
public class User implements Serializable {
    private static final long serialVersionUID = 1L;

    private Integer id;
    private String name;
// 不用Date类型做日期，因为实际开发中数据库表不会用Date类型
//    @DateTimeFormat(pattern="yyyy-MM-dd")
//    private Date birthday;
private String birthday;
    private String address;
}
```
1.1.6 UserMapper.xml
```
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.staritgp.platform.demo.mapper.SysDeptMapper">


<resultMap id="BaseResultMap" type="com.example.demo.entity.User">
      <id column="user_id" property="userId" />
      <result column="user_name" property="userName" />
      <result column="birthday" property="birthday" />
      <result column="address" property="address" />
      <result column="create_time" property="createTime" />
      <result column="update_time" property="updateTime" />
      <result column="create_by" property="createBy" />
      <result column="update_by" property="updateBy" />
   </resultMap>


<sql id="Base_Column_List">
user_id AS userId, user_name AS userName, birthday AS birthday, address AS address, create_time AS createTime, update_time AS updateTime, create_by AS createBy, update_by AS updateBy
    </sql>


   <select id="findAll" resultType="com.example.demo.entity.User">
select
      <include refid="Base_Column_List"></include>
from sys_dept where 1=1
      <if test="userName != null and userName != ''">

AND user_name like CONCAT('%',#{userName},'%')
      </if>
      <if test="userId != null and userId != ''">
AND user_id = #{userId}
      </if>
      <if test="createTime != null">
AND create_time = #{createTime}
      </if>
      <if test="updateTime != null">
AND update_time = #{updateTime}
      </if>
      <if test="createBy != null and createBy != ''">
AND create_by = #{createBy}
      </if>
      <if test="updateBy != null and updateBy != ''">
AND update_by = #{updateBy}
      </if>
   </select>

</mapper>
 
```
1.1.7 UserMapper.java 接口
package com.example.demo.mapper;

import com.example.demo.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import java.util.List;

@Mapper
public interface UserMapper {

/**
* 自定义分页sql，调用xml方式
* @param user
* @return
*/
List<User> findAll(User user);

// 调用注解方式
@Select("select * from user where user_id=#{id}")
public User findById(Integer id);
}
1.1.8 UserService.java
package com.example.demo.service.impl;

import com.example.demo.entity.User;
import com.example.demo.mapper.UserMapper;
import com.example.demo.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 UserMapper userMapper;

@Override public User findById(Integer id) {
return userMapper.findById(id);
}

@Override public List<User> findAll(User user) {
return userMapper.findAll(user);
}
}
1.1.9 UserServiceImpl.java
```
package com.example.demo.service.impl;

import com.example.demo.entity.User;
import com.example.demo.mapper.UserMapper;
import com.example.demo.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 UserMapper userMapper;

@Override public User findById(Integer id) {
        return userMapper.findById(id);
}

    @Override public List<User> findAll(User user) {
        return userMapper.findAll(user);
}
} 
```
1.1.10 UserController.java
使用@RestController替代@Controller和@ResponseBody（返回json串）

package com.example.demo.controller;

import com.example.demo.entity.User;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
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(value = "/user")
public class UserController {
@Autowired
private UserService userService;

@RequestMapping("/find")
public List<User> findAll(User user) {
return userService.findAll(user);
}

@RequestMapping("/get/{id}")
public User findById(@PathVariable Integer id){
return userService.findById(id);
}

}
1.1.11 application.yml
全局配置文件，yml为新的配置文件方式，注意其中格式为空格，不能有tab。

配置端口，配置数据源，配置mybatis全局配置。

注意：如果端口，启动时日志显示8080，说明此文件未加载。检查原因一般是文件名或者路径不正确。

# 服务端口
server:
port: 8081
# 数据连接池配置，druid 比 c3p0 还牛逼
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/mybatisdb
username: root
password: root
# com.example.demo 的子目录中的内容都会打印日志
logging:
level:
com.example.demo: debug
1.1.12 RunApplication.java
package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
// 扫描该包下的所有内容，什么mapperscan都不用管，约定大于配置
@ComponentScan(basePackages = {"com.example.demo"})
public class DemoApplication {

public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}

}
1.2         拓展：约定大于配置

1.2.1      在哪里约定的？

各组件都有注解形式的自动配置类，可以点进去看看，Spring帮我们定义了一个约定，遵守这个约定可以少好多事情，而且还不容易出错。

spring-boot-autoconfigure-1.5.4.RELEASE.jar

mybatis-spring-boot-autoconfigure-1.3.0.jar

pagehelper-spring-boot-autoconfigure-1.2.2.jar

1.3         实现CRUD操作

1.3.1      注解方式接口

剩下的CRUD方法，你们可以自行完善一下当做练手。

1.3.2      UserController
```
package com.example.demo.controller;

import com.example.demo.entity.User;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
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(value = "/user")
public class UserController {
    @Autowired
private UserService userService;

@RequestMapping("/find")
    public List<User> findAll(User user) {
        return userService.findAll(user);
}

    @RequestMapping("/get/{id}")
    public User findById(@PathVariable Integer id){
        return userService.findById(id);
}

    @RequestMapping("/update")
    public String update(User user) {
        return userService.update(user);
}

    // delete不做物理删除，只是标记为删除
@RequestMapping("/delete")
    public Boolean finddeleteAll(User user) {
        return userService.delete(user);
}

    @RequestMapping("/add")
    public User add(User user) {
        return userService.add(user);
}
} 
```
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原文地址：https://www.cnblogs.com/wood-life/p/10302041.html

SpringBoot整合SSM项目

更多内容参见个人技术博客，无广告欢迎关注

1.1.1 系统架构图

1.1.2 创建数据库表

1.1.4 pom.xml

1.1.5 User.java

1.1.6 UserMapper.xml

1.1.7 UserMapper.java 接口

1.1.8 UserService.java

1.1.9 UserServiceImpl.java

1.1.10 UserController.java

1.1.11 application.yml

1.1.12 RunApplication.java

1.2 拓展：约定大于配置

1.2.1 在哪里约定的？

1.3 实现CRUD操作

1.3.1 注解方式接口

1.3.2 UserController