SpringBoot-创建RESTful风格的 http接口访问jpa 来操作数据库

1.开发工具IDE:Intellij Idea，数据库mysql

（SpringBoot，创建RESTful 接口很方便，只要建立好数据模型，然后创建一个模型仓库接口就ok了）

2.开始开发

2.1项目目录清单：

新建SpringBoot Initializr 项目 选择jpa 和rest repository依赖，自己添加mysql-connector 类 用来连接mysql数据库

2.2 pom.xml内容：

<?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.example</groupId>    <artifactId>demo</artifactId>    <version>0.0.1-SNAPSHOT</version>    <packaging>jar</packaging>    <name>demo</name>    <description>Demo project for Spring Boot</description>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.5.6.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>        <java.version>1.8</java.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-data-jpa</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-data-rest</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>

2.2 Person类代码：

package com.example.demo;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;@Entitypublic class Person {    @Id    @GeneratedValue(strategy = GenerationType.IDENTITY)    private long Id;    private String firstName;    private String lastName;    public void setId(long id) {        Id = id;    }    public void setFirstName(String firstName) {        this.firstName = firstName;    }    public void setLastName(String lastName) {        this.lastName = lastName;    }    public long getId() {        return Id;    }    public String getFirstName() {        return firstName;    }    public String getLastName() {        return lastName;    }}

2.3PersonRepository接口代码：

package com.example.demo;import org.springframework.data.repository.PagingAndSortingRepository;import org.springframework.data.repository.query.Param;import org.springframework.data.rest.core.annotation.RepositoryRestResource;import org.springframework.stereotype.Repository;import java.util.List;@RepositoryRestResource(collectionResourceRel = "people",path = "people")//这个注解不是必须的，只是用来改变默认路径，如果去掉这行注解，默认路径就成*****/persons了public interface PersonRepositroy extends PagingAndSortingRepository<Person,Long> {    List<Person> findByLastName(@Param("name")String name);}

2.4application.properties 配置文件代码:

spring.datasource.url=jdbc:mysql://localhost:3306/你的数据库spring.datasource.username=账号spring.datasource.password=密码spring.jpa.hibernate.ddl-auto=create

3.测试

3.1访问htpp://locaohost:8080/ 和http://localhost:8080/people 看一下

//http:localhost:8080 的返回{  "_links" : {    "persons" : {      "href" : "http://localhost:8080/persons{?page,size,sort}",      "templated" : true    },    "profile" : {      "href" : "http://localhost:8080/profile"    }  }}//http://localhost:8080/people的返回{  "_embedded" : {    "people" : [ ]  },  "_links" : {    "self" : {      "href" : "http://localhost:8080/people{?page,size,sort}",      "templated" : true    },    "profile" : {      "href" : "http://localhost:8080/profile/people"    },    "search" : {      "href" : "http://localhost:8080/people/search"    }  },  "page" : {    "size" : 20,    "totalElements" : 0,    "totalPages" : 0,    "number" : 0  }}

3.2

控制台输入一下命令 想数据库添加数据(我是linux系统，windows的可以用postman工具进行post测试

$ curl -i -X POST -H "Content-Type:application/json" -d "{  \"firstName\" : \"Frodo\",  \"lastName\" : \"Baggins\" }" http://localhost:8080/people

-i 显示响应的头文件信息
-X POST 表明发送的是post请求，用来 添加数据
-H “Content-Type:application/json” 设置请求内容为json格式的数据
-d “{ \”firstName\” : \”Frodo\”, \”lastName\” : \”Baggins\” }” 要发送的Json数据 ,\ 为转义字符表明要保留引号

3.3 其他的自己测试吧，比如findByLastName等等