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服務器之家 - 編程語言 - JAVA教程 - Spring Boot 與 Kotlin 上傳文件的示例代碼

Spring Boot 與 Kotlin 上傳文件的示例代碼

2021-03-25 10:17quanke JAVA教程

這篇文章主要介紹了Spring Boot 與 Kotlin 上傳文件的示例代碼，小編覺得挺不錯的，現在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

如果我們做一個小型的web站，而且剛好選擇的kotlin 和Spring Boot技術棧，那么上傳文件的必不可少了，當然，如果你做一個中大型的web站，那建議你使用云存儲，能省不少事情。

這篇文章就介紹怎么使用kotlin 和Spring Boot上傳文件

構建工程

如果對于構建工程還不是很熟悉的可以參考《我的第一個Kotlin應用》

完整 build.gradle 文件

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group 'name.quanke.kotlin'
version '1.0-SNAPSHOT'
 
buildscript {
  ext.kotlin_version = '1.2.10'
  ext.spring_boot_version = '1.5.4.RELEASE'
  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的默認無參構造函數，默認把所有的類設置open類插件
    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'
 
 
jar {
  baseName = 'chapter11-5-6-service'
  version = '0.1.0'
}
repositories {
  mavenCentral()
}
 
 
dependencies {
  compile "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"
  compile "org.springframework.boot:spring-boot-starter-web:$spring_boot_version"
  compile "org.springframework.boot:spring-boot-starter-thymeleaf:$spring_boot_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"
}

創建文件上傳controller

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import name.quanke.kotlin.chaper11_5_6.storage.StorageFileNotFoundException
import name.quanke.kotlin.chaper11_5_6.storage.StorageService
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.core.io.Resource
import org.springframework.http.HttpHeaders
import org.springframework.http.ResponseEntity
import org.springframework.stereotype.Controller
import org.springframework.ui.Model
import org.springframework.web.bind.annotation.*
import org.springframework.web.multipart.MultipartFile
import org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder
import org.springframework.web.servlet.mvc.support.RedirectAttributes
 
import java.io.IOException
import java.util.stream.Collectors
 
 
/**
 * 文件上傳控制器
 * Created by http://quanke.name on 2018/1/12.
 */
 
@Controller
class FileUploadController @Autowired
constructor(private val storageService: StorageService) {
 
  @GetMapping("/")
  @Throws(IOException::class)
  fun listUploadedFiles(model: Model): String {
 
    model.addAttribute("files", storageService
        .loadAll()
        .map { path ->
          MvcUriComponentsBuilder
              .fromMethodName(FileUploadController::class.java, "serveFile", path.fileName.toString())
              .build().toString()
        }
        .collect(Collectors.toList()))
 
    return "uploadForm"
  }
 
  @GetMapping("/files/{filename:.+}")
  @ResponseBody
  fun serveFile(@PathVariable filename: String): ResponseEntity<Resource> {
 
    val file = storageService.loadAsResource(filename)
    return ResponseEntity
        .ok()
        .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + file.filename + "\"")
        .body(file)
  }
 
  @PostMapping("/")
  fun handleFileUpload(@RequestParam("file") file: MultipartFile,
             redirectAttributes: RedirectAttributes): String {
 
    storageService.store(file)
    redirectAttributes.addFlashAttribute("message",
        "You successfully uploaded " + file.originalFilename + "!")
 
    return "redirect:/"
  }
 
  @ExceptionHandler(StorageFileNotFoundException::class)
  fun handleStorageFileNotFound(exc: StorageFileNotFoundException): ResponseEntity<*> {
    return ResponseEntity.notFound().build<Any>()
  }
 
}

上傳文件服務的接口

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import org.springframework.core.io.Resource
import org.springframework.web.multipart.MultipartFile
 
import java.nio.file.Path
import java.util.stream.Stream
 
interface StorageService {
 
  fun init()
 
  fun store(file: MultipartFile)
 
  fun loadAll(): Stream<Path>
 
  fun load(filename: String): Path
 
  fun loadAsResource(filename: String): Resource
 
  fun deleteAll()
 
}

上傳文件服務

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import org.springframework.beans.factory.annotation.Autowired
import org.springframework.core.io.Resource
import org.springframework.core.io.UrlResource
import org.springframework.stereotype.Service
import org.springframework.util.FileSystemUtils
import org.springframework.util.StringUtils
import org.springframework.web.multipart.MultipartFile
import java.io.IOException
import java.net.MalformedURLException
import java.nio.file.Files
import java.nio.file.Path
import java.nio.file.Paths
import java.nio.file.StandardCopyOption
import java.util.stream.Stream
 
@Service
class FileSystemStorageService @Autowired
constructor(properties: StorageProperties) : StorageService {
 
  private val rootLocation: Path
 
  init {
    this.rootLocation = Paths.get(properties.location)
  }
 
  override fun store(file: MultipartFile) {
    val filename = StringUtils.cleanPath(file.originalFilename)
    try {
      if (file.isEmpty) {
        throw StorageException("Failed to store empty file " + filename)
      }
      if (filename.contains("..")) {
        // This is a security check
        throw StorageException(
            "Cannot store file with relative path outside current directory " + filename)
      }
      Files.copy(file.inputStream, this.rootLocation.resolve(filename),
          StandardCopyOption.REPLACE_EXISTING)
    } catch (e: IOException) {
      throw StorageException("Failed to store file " + filename, e)
    }
 
  }
 
  override fun loadAll(): Stream<Path> {
    try {
      return Files.walk(this.rootLocation, 1)
          .filter { path -> path != this.rootLocation }
          .map { path -> this.rootLocation.relativize(path) }
    } catch (e: IOException) {
      throw StorageException("Failed to read stored files", e)
    }
 
  }
 
  override fun load(filename: String): Path {
    return rootLocation.resolve(filename)
  }
 
  override fun loadAsResource(filename: String): Resource {
    try {
      val file = load(filename)
      val resource = UrlResource(file.toUri())
      return if (resource.exists() || resource.isReadable) {
        resource
      } else {
        throw StorageFileNotFoundException(
            "Could not read file: " + filename)
 
      }
    } catch (e: MalformedURLException) {
      throw StorageFileNotFoundException("Could not read file: " + filename, e)
    }
 
  }
 
  override fun deleteAll() {
    FileSystemUtils.deleteRecursively(rootLocation.toFile())
  }
 
  override fun init() {
    try {
      Files.createDirectories(rootLocation)
    } catch (e: IOException) {
      throw StorageException("Could not initialize storage", e)
    }
 
  }
}

自定義異常

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open class StorageException : RuntimeException {
 
  constructor(message: String) : super(message)
 
  constructor(message: String, cause: Throwable) : super(message, cause)
}
class StorageFileNotFoundException : StorageException {
 
  constructor(message: String) : super(message)
 
  constructor(message: String, cause: Throwable) : super(message, cause)
}

配置文件上傳目錄

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import org.springframework.boot.context.properties.ConfigurationProperties
 
@ConfigurationProperties("storage")
class StorageProperties {
 
  /**
   * Folder location for storing files
   */
  var location = "upload-dir"
 
}

啟動Spring Boot

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/**
 * Created by http://quanke.name on 2018/1/9.
 */
 
@SpringBootApplication
@EnableConfigurationProperties(StorageProperties::class)
class Application {
 
  @Bean
  internal fun init(storageService: StorageService) = CommandLineRunner {
    storageService.deleteAll()
    storageService.init()
  }
 
  companion object {
 
    @Throws(Exception::class)
    @JvmStatic
    fun main(args: Array<String>) {
      SpringApplication.run(Application::class.java, *args)
    }
  }
}

創建一個簡單的 html模板 src/main/resources/templates/uploadForm.html

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<html xmlns:th="http://www.thymeleaf.org">
<body>
 
<div th:if="${message}">
  <h2 th:text="${message}"/>
</div>
 
<div>
  <form method="POST" enctype="multipart/form-data" action="/">
    <table>
      <tr>
        <td>File to upload:</td>
        <td><input type="file" name="file"/></td>
      </tr>
      <tr>
        <td></td>
        <td><input type="submit" value="Upload"/></td>
      </tr>
    </table>
  </form>
</div>
 
<div>
  <ul>
    <li th:each="file : ${files}">
      <a th:href="${file}" rel="external nofollow" th:text="${file}"/>
    </li>
  </ul>
</div>
 
</body>
</html>

配置文件 application.yml

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spring:
 http:
  multipart:
   max-file-size: 128KB
   max-request-size: 128KB

更多Spring Boot 和 kotlin相關內容，歡迎關注 《Spring Boot 與 kotlin 實戰》

源碼：

https://github.com/quanke/spring-boot-with-kotlin-in-action/

參考:

https://spring.io/guides/gs/uploading-files/

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。

原文鏈接：https://www.jianshu.com/p/d4952e71360b

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