package com.glxp.api.util; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileItemFactory; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.http.MediaType; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.commons.CommonsMultipartFile; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; public class MultipartFileTest { private static final Logger log = LoggerFactory.getLogger(MultipartFileTest.class); private MultipartFileTest() { } public static void main(String[] args) { // 本地文件转为MultipartFile类型 String fileName="D:\\1s\\a6294b6b58de15136bb827dd1efdc76.jpg"; fileName = fileName.substring(fileName.lastIndexOf("/")); } public static MultipartFile getMultipartFile(InputStream inputStream, String fileName) { FileItem fileItem = createFileItem(inputStream, fileName); return new CommonsMultipartFile(fileItem); } public static MultipartFile[] getMultipartFiles(InputStream[] inputStream, String fileName) { // 多文件转换 int length = inputStream.length; MultipartFile[] multipartFiles = new MultipartFile[length]; for (int i = 0; i < length; i++) { FileItem fileItem = createFileItem(inputStream[i], fileName); multipartFiles[i] = new CommonsMultipartFile(fileItem); } return multipartFiles; } public static FileItem createFileItem(InputStream inputStream, String fileName) { FileItemFactory factory = new DiskFileItemFactory(16, null); FileItem fileItem = factory.createItem("file", MediaType.MULTIPART_FORM_DATA_VALUE, true, fileName); int read = 0; OutputStream os = null; byte[] buffer = new byte[10 * 1024 * 1024]; try { os = fileItem.getOutputStream(); while ((read = inputStream.read(buffer, 0, 4096)) != -1) { os.write(buffer, 0, read); } inputStream.close(); } catch (IOException e) { log.error("os write exception", e); throw new IllegalArgumentException("文件流输出失败"); } finally { if (os != null) { try { os.close(); } catch (IOException e) { log.error("stream os close exception", e); } } if (inputStream != null) { try { inputStream.close(); } catch (IOException e) { log.error("stream inputStream close exception", e); } } } return fileItem; } }