Spring boot data jpa 一

Posted 2020-10-21 ^梦幻星空^

一、maven pom.xml文件

<?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>

    <groupId>com.ltchu</groupId>
    <artifactId>design</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>design</name>
    <description>ltchu‘s graduation design</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

　　　　　　<dependency>
　　　　　　　　<groupId>org.springframework.boot</groupId>
　　　　　　　　<artifactId>spring-boot-starter-thymeleaf</artifactId>
　　　　　　</dependency>

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

    </dependencies>

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

</project>

 

二、properties配置文件

spring.datasource.url = jdbc:mysql://127.0.0.1:3306/design?characterEncoding=UTF-8&useSSL=false
spring.datasource.username = root
spring.datasource.password = root
spring.datasource.driver-class-name = com.mysql.jdbc.Driver

#建表策略，这里用update，即根据实体更新表结构
spring.jpa.hibernate.ddl-auto = update

#thymeleaf模板
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.content-type=text/html
spring.thymeleaf.mode=HTML5
spring.thymeleaf.cache=false

 

三、实体类

package com.ltchu.design.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import org.hibernate.annotations.GenericGenerator;

@Entity
@Table(name="person")
public class Person {

    @Id
    //本来jpa是不支持uuid的，但借用hibernate的方法可以实现。
    @GeneratedValue(generator = "uuid")
    @GenericGenerator(name = "uuid", strategy = "org.hibernate.id.UUIDHexGenerator")
    private String id;
    
    private String name;
　　
　　 public Person(String id, String name) {
        super();
        this.id = id;
        this.name = name;
    }

　　...　　setter / getter方法

}

 

四、Repository

package com.ltchu.design.repository;
import org.springframework.data.repository.CrudRepository;
import com.ltchu.design.model.Person;

public interface PersonRepository extends CrudRepository<Person, String> {

}

 

五、TestController

package com.ltchu.design.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.ltchu.design.model.Person;
import com.ltchu.design.repository.PersonRepository;

@Controller
public class TestController {

    @Autowired
    private PersonRepository personRepository;
    
    @RequestMapping(value = {"/", "/home"})
　　 @ResponseBody
    public String home() {
        personRepository.save(new Person("zhangsan"));
        return "home";
    }
    
}

 

六、DesignApplication

package com.ltchu.design;
import java.util.TimeZone;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DesignApplication {

    public static void main(String[] args) {
        TimeZone.setDefault(TimeZone.getTimeZone("Asia/Shanghai"));
        SpringApplication.run(DesignApplication.class, args);
    }
}

 

七、html文件

<!DOCTYPE html>
<html>
　　<head>
　　　　<meta charset="UTF-8"/>
　　　　<title>home title</title>
　　</head>
　　<body>
　　　　啊啦啦啦
　　</body>
</html>