REST web服务已成为在web上应用程序集成的首选方式。在其核心中，REST定义了系统由客户端交互的资源组成。这些资源以超媒体驱动的方式实现。Spring MVC为构建这些服务提供了坚实的基础。但是，对于多域对象系统，即使实施REST web服务的最简单原则也可能相当乏味，并且导致大量样板代码。

Spring Data REST构建在Spring Data repositories之上，并自动将其导出为REST资源。它利用超媒体来允许客户端查找存储库暴露的功能，并将这些资源自动集成到相关的超媒体功能中。

根据model，生成HAL风格的restful API
根据model，维护实体之间的关系
支持分页
允许动态地过滤集合资源
允许通过处理Spring ApplicationEvents处理REST请求。
目前支持JPA，MongoDB，Neo4j，Solr，Cassandra，Gemfire。
支持自定义

将Spring Data REST添加到Spring Boot项目

dependencies {     ...     compile "org.springframework.boot:spring-boot-starter-data-rest:$spring_boot_version"     ... }

完整的build.gradle文件

group 'name.quanke.kotlin' version '1.0-SNAPSHOT'  buildscript {     ext.kotlin_version = '1.2.10'     ext.spring_boot_version = '1.5.4.RELEASE'     ext.springfox_swagger2_version = '2.7.0'     ext.mysql_version = '5.1.21'     ext.mybatis_version = '1.1.1'     repositories {         mavenCentral()     }     dependencies {         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"         classpath("org.springframework.boot:spring-boot-gradle-plugin:$spring_boot_version")  //        Kotlin整合SpringBoot的默认无参构造函数，默认把所有的类设置open类插件         classpath("org.jetbrains.kotlin:kotlin-noarg:$kotlin_version")         classpath("org.jetbrains.kotlin:kotlin-allopen:$kotlin_version")     } }  apply plugin: 'kotlin' apply plugin: "kotlin-spring" // See https://kotlinlang.org/docs/reference/compiler-plugins.html#kotlin-spring-compiler-plugin apply plugin: 'org.springframework.boot' apply plugin: "kotlin-jpa"  //https://stackoverflow.com/questions/32038177/kotlin-with-jpa-default-constructor-hell jar {     baseName = 'chapter11-6-7-service'     version = '0.1.0' } repositories {     mavenCentral() }   dependencies {     compile "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"     compile("org.jetbrains.kotlin:kotlin-reflect:${kotlin_version}")      compile "org.springframework.boot:spring-boot-starter-data-jpa:$spring_boot_version"     compile "org.springframework.boot:spring-boot-starter-data-rest:$spring_boot_version"     compile "mysql:mysql-connector-java:$mysql_version"       testCompile "org.springframework.boot:spring-boot-starter-test:$spring_boot_version"     testCompile "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"  }  compileKotlin {     kotlinOptions.jvmTarget = "1.8" } compileTestKotlin {     kotlinOptions.jvmTarget = "1.8" }

创建对象User

 import javax.persistence.*  /**  * Created by http://quanke.name on 2018/1/10.  */  @Entity data class User(         @Id         @GeneratedValue(strategy = GenerationType.AUTO)         var id: Long = -1,         @Column(nullable = false)         var username: String = "",          var password: String = ""   )

创建UserRepository

增加@RepositoryRestResource注解关于@RepositoryRestResource详细的使用介绍，请参考： https://springcloud.cc/spring-data-rest-zhcn.html

 import name.quanke.kotlin.chaper11_6_7.entity.User import org.springframework.data.jpa.repository.JpaRepository import org.springframework.data.jpa.repository.Query import org.springframework.data.repository.query.Param import org.springframework.data.rest.core.annotation.RepositoryRestResource  @RepositoryRestResource(path="user") interface UserRepository : JpaRepository<User, Long> {      fun findByUsername(username: String): List<User>      fun findByUsernameAndPassword(username: String, password: String?): User      @Query("from User u where u.username=:username")     fun findUser(@Param("username") username: String): User  }

配置

在application.yml文件中增加

spring:   datasource:     url: jdbc:mysql://localhost:3306/test     username: root     password: 123456     driver-class-name: com.mysql.jdbc.Driver

启动

import org.springframework.boot.SpringApplication import org.springframework.boot.autoconfigure.SpringBootApplication   /**  * Created by http://quanke.name on 2018/1/9.  */  //参考：http://blog.csdn.net/soul_code/article/details/54108105  @SpringBootApplication class Application  fun main(args: Array<String>) {     SpringApplication.run(Application::class.java, *args) }

测试

访问 127.0.0.1:8080/user

{     "_embedded": {         "users": [             {                 "username": "http://gof.quanke.name",                 "password": "1111",                 "_links": {                     "self": {                         "href": "http://127.0.0.1:8083/user/73"                     },                     "user": {                         "href": "http://127.0.0.1:8083/user/73"                     }                 }             },             {                 "username": "java.quanke.name",                 "password": "12",                 "_links": {                     "self": {                         "href": "http://127.0.0.1:8083/user/74"                     },                     "user": {                         "href": "http://127.0.0.1:8083/user/74"                     }                 }             },             {                 "username": "test.quanke.name",                 "password": "aa",                 "_links": {                     "self": {                         "href": "http://127.0.0.1:8083/user/75"                     },                     "user": {                         "href": "http://127.0.0.1:8083/user/75"                     }                 }             },             {                 "username": "es.quanke.name",                 "password": "12",                 "_links": {                     "self": {                         "href": "http://127.0.0.1:8083/user/76"                     },                     "user": {                         "href": "http://127.0.0.1:8083/user/76"                     }                 }             },             {                 "username": "as.quanke.name",                 "password": "12",                 "_links": {                     "self": {                         "href": "http://127.0.0.1:8083/user/77"                     },                     "user": {                         "href": "http://127.0.0.1:8083/user/77"                     }                 }             },             {                 "username": "vertx.quanke.name",                 "password": "12",                 "_links": {                     "self": {                         "href": "http://127.0.0.1:8083/user/78"                     },                     "user": {                         "href": "http://127.0.0.1:8083/user/78"                     }                 }             }         ]     },     "_links": {         "self": {             "href": "http://127.0.0.1:8083/user{?page,size,sort}",             "templated": true         },         "profile": {             "href": "http://127.0.0.1:8083/profile/user"         },         "search": {             "href": "http://127.0.0.1:8083/user/search"         }     },     "page": {         "size": 20,         "totalElements": 6,         "totalPages": 1,         "number": 0     } }

访问 127.0.0.1:8083/user/73

注意： 73 是user id 根据自己的实际情况测试

{     "username": "http://gof.quanke.name",     "password": "1111",     "_links": {         "self": {             "href": "http://127.0.0.1:8083/user/73"         },         "user": {             "href": "http://127.0.0.1:8083/user/73"         }     } }

Spring Data REST 能做的事情很多，这篇文章先介绍到这里，先在这里埋个坑，之后会出更加详细的文章说Spring Data REST。

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