原文地址：http://blog.csdn.net/webzhuce/article/details/54428885
本文继续在《在Spring Boot应用中使用JSP开发网页》基础上介绍如何连接数据库MySQL。
修改pom.xml文件
在项目的pom.xml文件上增加如下代码，添加依赖文件。
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
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设置全局配置文件
在src/main/resources/application.properties中设置数据源和jpa配置。
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/apple
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driverClassName = com.mysql.jdbc.Driver
# Specify the DBMS
spring.jpa.database = MYSQL
# Show or not log for each sql query
spring.jpa.show-sql = true
# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update
# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
# stripped before adding them to the entity manager)
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect- 1
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需要添加的配置都在上面的代码中，不需要另外的XML配置和Java配置。上面代码中的数据库配置，你需要换成你的数据库的地址和用户名密码。hibernate的ddl-auto=update配置表名，数据库的表和列会自动创建。
MySQL数据库
安装mysql，MySQL官方下载连接。安装后，建立一个名为student的表。我的表如下：
建立实体
在包com.neon.apple下新建一个model包，然后在model下建立Student类。Student类用来创建一个Student实体，Student包含三个属性id,name,sex,age和telephone。Student实体和Mysql数据库的student表相对应，如上图。
package com.neon.apple.model;
import javax.persistence.*;
@Entity
public class Student {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
private Long age;
private String telephone;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Long getAge() {
return age;
}
public void setAge(Long age) {
this.age = age;
}
public String getTelephone() {
return telephone;
}
public void setTelephone(String telephone) {
this.telephone = telephone;
}
}
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实体的数据访问层StudentRespositroy
在包com.neon.apple下新建一个repositroy包，然后在respositroy下建立StudentRepositroy接口。StudentRepositroy接口继承CrudRespositroy，CrudRepositroy已经实现了save,delete,deleteAll,findOne和findAll。
package com.neon.apple.repository;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import com.neon.apple.model.Student;
@Repository
public interface StudentRepository extends CrudRepository<Student, Long>{
Student findStudentById(Long id);
}
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编写控制器Controller和JSP页面
在之前com.neon.apple.controller包的LoginController类中继续编辑，完整代码如下：
package com.neon.apple.controller;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.neon.apple.model.Student;
import com.neon.apple.repository.StudentRepository;
@Controller
public class LoginController {
@Autowired
StudentRepository studentRepository;
@RequestMapping("/")
public String home() {
return "index";
}
@RequestMapping(value="/testdb")
public String testDataBase(Map<String, Object> model){
Long id = (long) 1;
Student stu = studentRepository.findStudentById(id);
model.put("student", stu);
return "testDataBase";
}
}
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建立testDataBase.jsp文件，用来简单显示MySQL数据库student表的数据，代码如下。
<!DOCTYPE html>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<div>
<span>${student.name}</span>
</div>
<div>
<span>${student.age}</span>
</div>
</body>
<script src="/static/js/jquery-3.1.1.min.js"></script>
</html>- 1
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测试结果
运行后，浏览器显示如下：
