JavaEE-自定义SSM-环境搭建-测试程序

1. 环境搭建

1.1 结构说明

1.2 创建父项目

项目名：myssm-parent-quan12

1.3 创建核心项目

项目名：myssm-core-quan12

配置pom文件（4个坐标）

xml 复制代码

    <dependencies>
        <!-- 内置tomcat -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <version>2.3.12.RELEASE</version>
        </dependency>
        <!-- yaml解析 -->
        <dependency>
            <groupId>org.yaml</groupId>
            <artifactId>snakeyaml</artifactId>
            <version>1.26</version>
        </dependency>
        <!--  lombok        -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.24</version>
        </dependency>
        <!--  fastjson      -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.83</version>
        </dependency>
    </dependencies>

1.4 测试项目

项目名：myssm-test-quan12

配置pom文件（2个坐标）

xml 复制代码

    <dependencies>
        <!-- 自定义核心项目 -->
        <dependency>
            <groupId>com.czxy</groupId>
            <artifactId>myssm-core-quan12</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <!--MySQL数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.32</version>
        </dependency>
    </dependencies>

2. 编写测试程序

2.0 编写流程

编写内容：
- yml文件
- 启动类：@MySpringBootApplication、MySpringApplication.run()
- domain
- 数据访问层dao：@MyMapper
- 业务层service：@MyService
- 控制器web：@MyRestController、@MyRequestMapping、@MyGetMapping、@MyPostMapping
【注意】测试程序编写完成后，将会出现大量错误，核心core没有完成任何功能

2.1 编写yml文件

yml 复制代码

server:
  port: 9090
spring:
  datasource:
    driverClassName: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/cloud_db1?useUnicode=true&characterEncoding=utf8
    username: root
    password: '1234'

2.2 启动类

java 复制代码

package com.czxy;


@MySpringBootApplication
public class MyTestApplication {
    public static void main(String[] args) {
        MySpringApplication.run(MyTestApplication.class, args);
    }
}

注意：程序报错属于正常现象，后面核心编写完成后将解决。

2.3 JavaBean：User

java 复制代码

package com.czxy.domain;

import lombok.Data;


@Data
public class User {
    private Integer uid;
    private String username;
    private String password;
    private Integer age;
}

/*
CREATE TABLE `t_user` (
  `uid` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(50) DEFAULT NULL,
  `password` varchar(32) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  PRIMARY KEY (`uid`)
)
 */

2.4 Mapper

java 复制代码

package com.czxy.mapper;

import com.czxy.domain.User;

import java.util.List;


@MyMapper
public interface UserMapper {

    @MySelect("select * from t_user")
    public List<User> selectAll();
}

2.5 Service

接口

java 复制代码

package com.czxy.service;

import com.czxy.domain.User;

import java.util.List;


public interface UserService {

    public List<User> selectAll();
}

实现类

java 复制代码

package com.czxy.service.impl;

import com.czxy.domain.User;
import com.czxy.mapper.UserMapper;
import com.czxy.service.UserService;

import javax.annotation.Resource;
import java.util.List;


@MyService
public class UserServiceImpl implements UserService {

    @Resource
    private UserMapper userMapper;

    @Override
    public List<User> selectAll() {
        return userMapper.selectAll();
    }
}

2.6 Controller

java 复制代码

package com.czxy.controller;

import com.czxy.domain.User;
import com.czxy.service.UserService;

import javax.annotation.Resource;
import java.util.List;


@MyRestController
@MyRequestMapping("/user")
public class UserController {

    @Resource
    private UserService userService;

    @MyGetMapping
    public List<User> selectAll() {
        List<User> userList = userService.selectAll();
        return userList;
    }
}