java

SpringBoot+MyBatis+MySQL环境搭建

2019-05-24  本文已影响0人  WilsonGuo

用IDEA开始搭建一个Springboot项目:

1,选中“Spring Initializr”, 以默认选项为准

点击“Next”

修改“Group”和“Artifact”两项,点击“Next”

进入下一项:

以上3张截图的内容为主,点击“Next”,进入工程目录,如下图:

新建目录:controller、mapper、model、service

*目录介绍:

A.java目录下放入业务代码:

controller、mapper、model、service

B.resources是存放项目资源,

1.templates放置模板(html页面)

2.static放置css、图片、js等静态资源文件

application.properties文件中的内容如下:

#端口

server.port=8888

#设置spring-boot编码格式

spring.banner.charset=UTF-8

server.tomcat.uri-encoding=UTF-8

spring.http.encoding.charset=UTF-8

spring.http.encoding.enabled=true

spring.messages.encoding=UTF-8

#视图层控制 用MVC方式访问templates下的HTML

#让Springboot支持jsp

spring.mvc.view.prefix=calsspath:/templates/

spring.mvc.view.suffix=.jsp

spring.mvc.static-path-pattern=/static/**

spring.resources.static-locations=classpath:/static/

spring.thymeleaf.mode=HTML

spring.thymeleaf.encoding=UTF-8

#页面热加载,否则没法看到实时页面

spring.thymeleaf.cache =false

spring.thymeleaf.prefix=classpath:/templates/

spring.thymeleaf.suffix=.html

#MySql配置

spring.datasource.url =jdbc:mysql://localhost:3306/TEST

spring.datasource.username =root

spring.datasource.password =********

spring.datasource.driverClassName =com.mysql.cj.jdbc.Driver

mybatis.type-aliases-package=com.example.mydemo.model

# AOP 切面

# 添加@EnableAspectJAutoProxy。

spring.aop.auto=true

# 是否要创建基于子类(CGLIB)的代理(true),而不是基于标准的基于Java接口的代理(false)。

spring.aop.proxy-target-class=false


前提是假设MySQL中已有数据库“TEST”,含有表“person” 字段id 、name、age

如上面的配置文件信息,截图如下:

各个Java类文件内容:

MydemoApplication类:

import org.mybatis.spring.annotation.MapperScan;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.web.servlet.config.annotation.EnableWebMvc;

@MapperScan("com.example.mydemo.mapper")

@EnableWebMvc

@SpringBootApplication

public class MydemoApplication {

public static void main(String[] args) {

SpringApplication.run(MydemoApplication.class, args);

}

}


UserController类内容:

import com.example.mydemo.service.UserService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;

@Controller

public class UserController {

@Autowired

    private UserServiceuserService;

@RequestMapping("/index")//过滤器

    public String index(){

return "MyHtml";

}

@RequestMapping("/showUser/{id}")

public String selectUser(@PathVariable int id,Model model){

model.addAttribute("name",userService.selectUser(id).toString());

return "greets";

}

}


UserMapper类内容:

import com.example.mydemo.model.Person;

import org.apache.ibatis.annotations.Select;

import org.springframework.stereotype.Repository;

import java.util.ArrayList;

@Repository

public interface UserMapper {

@Select("SELECT * FROM person WHERE id = #{id}")

Person selectUser(int id);//返回一个person对象

}


Person类:

public class Person {

private Integerid;

private Stringname;

private Integerage;

public Integer getId() {

return id;

}

public void setId(Integer id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Integer getAge() {

return age;

}

public void setAge(Integer age) {

this.age = age;

}

@Override

    public String toString() {

return "id="+id+", name="+name+", age="+age;

}

}


UserService类内容:

import com.example.mydemo.mapper.UserMapper;

import org.springframework.beans.factory.annotation.Autowired;

import com.example.mydemo.model.Person;

import org.springframework.stereotype.Service;

import java.util.ArrayList;

@Service

public class UserService {

@Autowired

    public UserMapperuserMapper;

public Person selectUser(int id){

return userMapper.selectUser(id);

}

}


资源结构目录下的资源介绍:

templates目录下新建MyHtml.html和greets.html文件,static目录下新建test.css文件

MyHtml.html内容如下:

<!DOCTYPE html>

<html lang="en">

<head>

<meta charset="UTF-8"/>

<title>Title</title>

<link rel="stylesheet" href="/test.css" type="text/css"/>

</head>

<body>

<h1>Hello World</h1>

<img src="imag.png" alt="hello">

</body>

</html>

greets.html文件内容如下:

<!DOCTYPE html>

<html lang="en">

<html xmlns:th="http://www.thymeleaf.org">

<head>

<meta charset="UTF-8">

<title>Title</title>

</head>

<body>

<p th:text="'Hello, ' + ${name} + '!'" />

</body>

</html>


test.css目录如下:

body{

color:red;

}

**************************************************

启动工程后,在浏览器中输入:

http://localhost:8888/index

出现如下界面:

在浏览器中输入:

http://localhost:8888/showUser/1

出现如下界面:

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