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确定好服务器端文件保存的位置确定好请求参数名#xff08;前后端要保持一致的喔#xff09;如果手机是通过usb连接到电脑的#xff0c;需要执行一下#xff1a; adb reverse tcp:8080 tcp:8080 AndroidManifest.xml的application/节点中加上: android:usesC…准备
确定好服务器端文件保存的位置确定好请求参数名前后端要保持一致的喔如果手机是通过usb连接到电脑的需要执行一下 adb reverse tcp:8080 tcp:8080 AndroidManifest.xml的application/节点中加上: android:usesCleartextTraffictrue 引入依赖: implementation(com.google.net.cronet:cronet-okhttp:0.1.0)
开始
Android端
Activity(ComponentActivity)private lateinit var imagePicker: ActivityResultLauncherPickVisualMediaRequestoverride fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)imagePicker registerForActivityResult(ActivityResultContracts.PickVisualMedia()) {context.contentResolver.openInputStream(it)?.use {val file File(File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS), TempFiles).smartCreate(true), Image_${currentTimeMillis}.png).smartCreate()it.copyTo(FileOutputStream(file))launch(Dispatchers.Main) { launch(Dispatchers.IO) { val clint OkHttpClient()val requestBody MultipartBody.Builder().apply {setType(MultipartBody.FORM)// 这个 file 是前后端参数名保持一致不然springboot报错addFormDataPart(file, imageFile!!.name, RequestBody.create(MediaType.parse(image/*),imageFile))}.build()val responseBody clint.newCall(Request.Builder().post(requestBody).url(http://localhost:8080/upload).build()).execute().body()logE { ${responseBody?.string()} }}}}}
}inline val currentTimeMillis: Longget() System.currentTimeMillis()fun File.smartCreate(isDir: Boolean false): File {if (!exists()) {parentFile?.mkdirs()if (isDir) mkdir() else createNewFile()}return this
}服务端(Spring Boot)
1.在application.properties文件中配置文件相关的参数
spring.servlet.multipart.max-request-size50MB
spring.servlet.multipart.max-file-size50MB# 上传的文件保存在哪个文件下这里保存到项目文件夹下的upload文件夹
# 也可以指定其他文件夹把路径复制上就行比如 upload.file.pathC:\Users\Public\Pictures
upload.file.pathupload2.写Controller方法
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;RestController
public class TestController {Value(${upload.file.path})private String uploadPathStr;/*** 保持请求参数名一致* * param file* return*/PostMapping(/upload)public ResponseBody boolean upload(RequestParam(file) MultipartFile file){if(file null || file.isEmpty() || filename null || filename.isEmpty())return false;try(InputStream inputStream file.getInputStream()) {Path uploadPath Paths.get(uploadPathStr);if(!uploadPath.toFile().exists())uploadPath.toFile().mkdirs();Files.copy(inputStream, Paths.get(uploadPathStr).resolve(file.getOriginalFilename()), StandardCopyOption.REPLACE_EXISTING);System.out.println(upload file , filename is file.getOriginalFilename() , filePath Paths.get(uploadPathStr).resolve(file.getOriginalFilename()).toAbsolutePath().toString());return true;}catch (IOException e) {e.printStackTrace();return false;}}
}运行调试即可…
