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）

  
      <dependencies>
          
          <dependency>
              <groupId>org.springframework.bootgroupId>
              <artifactId>spring-boot-starter-tomcatartifactId>
              <version>2.3.12.RELEASEversion>
          dependency>
          
          <dependency>
              <groupId>org.yamlgroupId>
              <artifactId>snakeyamlartifactId>
              <version>1.26version>
          dependency>
          
          <dependency>
              <groupId>org.projectlombokgroupId>
              <artifactId>lombokartifactId>
              <version>1.18.24version>
          dependency>
          
          <dependency>
              <groupId>com.alibabagroupId>
              <artifactId>fastjsonartifactId>
              <version>1.2.83version>
          dependency>
      dependencies>
  
  

1.4 测试项目

• 项目名：myssm-test-quan12

  

• 配置pom文件（2个坐标）

      <dependencies>
          
          <dependency>
              <groupId>com.czxygroupId>
              <artifactId>myssm-core-quan12artifactId>
              <version>1.0-SNAPSHOTversion>
          dependency>
          
          <dependency>
              <groupId>mysqlgroupId>
              <artifactId>mysql-connector-javaartifactId>
              <version>5.1.32version>
          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

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

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

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

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

  package com.czxy.service;
  
  import com.czxy.domain.User;
  
  import java.util.List;
  
  
  public interface UserService {
  
      public List<User> selectAll();
  }
  
  

• 实现类

  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

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;
    }
}