Spring Boot 与 kotlin 实战-Spring Boot 与 Kotlin 使用Spring Data Rest创建HAL风格Restful接口 - 书目录

Spring Boot 与 kotlin 实战-Spring Boot 与 Kotlin 使用Spring Data Rest创建HAL风格Restful接口

Spring Boot 与 Kotlin 使用Spring Data Rest创建HAL风格Restful接口

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

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

返回:

{
“_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

返回:

{
“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。

参考

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转载链接:http://woquanke.com/posts/42854/