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文件转base64字符串
/** * file转换为base64 * 注意：这里转换为base64后，是不包含文件head头的 */public static String fileToBase64(File file) { Base64.Encoder base64 = Base64.getEncoder(); String base64Str = null; try (FileInputStream fis = new FileInputStream(file); ByteArrayOutputStream bos = new ByteArrayOutputStream()) { byte[] b = new byte[1024]; int n; while ((n = fis.read(b)) != -1) { bos.write(b, 0, n); } base64Str = base64.encodeToString(bos.toByteArray()); } catch (IOException e) { e.printStackTrace(); } return base64Str;}
base64字符串转文件
/** * base64转化为file，并保存到指定路径下 */public static void base64ToFile(String base, String path) { if (StringUtils.isBlank(base)) { return; } Base64.Decoder decoder = Base64.getDecoder(); try (OutputStream out = new FileOutputStream(path)) { byte[] bytes = decoder.decode(base); for (int i = 0; i < bytes.length; ++i) { if (bytes[i] < 0) { bytes[i] += 256; } } out.write(bytes); out.flush(); } catch (IOException e) { e.printStackTrace(); }}
base64转化为file流
/** * base64转化为file流 */public static File base64ToFile(String base64) { if (base64 == null || "".equals(base64)) { return null; } byte[] buff = Base64.getDecoder().decode(base64); File file; try { file = File.createTempFile("tmp", null); } catch (IOException e) { e.printStackTrace(); return null; } try (FileOutputStream out = new FileOutputStream(file)) { out.write(buff); } catch (IOException e) { e.printStackTrace(); } return file;}
base64转MultipartFile
import org.springframework.web.multipart.MultipartFile;import java.io.*;import java.util.Base64;/** * @author 笑小枫 */public class Base64DecodedMultipartFile implements MultipartFile { private final byte[] imgContent; private final String header; private final String fileName; public Base64DecodedMultipartFile(byte[] imgContent, String header, String fileName) { this.imgContent = imgContent; this.header = header.split(";")[0]; this.fileName = fileName; } @Override public String getName() { return fileName + "." + header.split("/")[1]; } @Override public String getOriginalFilename() { return fileName + "." + header.split("/")[1]; } @Override public String getContentType() { return header.split(":")[1]; } @Override public boolean isEmpty() { return imgContent == null || imgContent.length == 0; } @Override public long getSize() { return imgContent.length; } @Override public byte[] getBytes() { return imgContent; } @Override public InputStream getInputStream() { return new ByteArrayInputStream(imgContent); } @Override public void transferTo(File dest) throws IOException, IllegalStateException { try (FileOutputStream fos = new FileOutputStream(dest)) { fos.write(imgContent); } } /** * base64转multipartFile **/ public static MultipartFile base64Convert(String base64, String header, String fileName) { Base64.Decoder decoder = Base64.getDecoder(); byte[] b = decoder.decode(base64); //取索引为1的元素进行处理 for (int i = 0; i < b.length; ++i) { if (b[i] < 0) { b[i] += 256; } } // 处理过后的数据通过Base64DecodeMultipartFile转换为MultipartFile对象 return new Base64DecodedMultipartFile(b, header, fileName); }}
byte数组转MultiPartFile
POM导入
<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.5</version></dependency><dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>RELEASE</version></dependency>
代码部分
byte[] bytes = message.getPacket();InputStream inputStream = new ByteArrayInputStream(bytes);MultipartFile file = new MockMultipartFile(ContentType.APPLICATION_OCTET_STREAM.toString(), inputStream);
MultipartFile转化为byte数组
byte[] bytes= file.getBytes();
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