Java 中使用 Jersey 实现上传文件(附加密和解密)

Jersey 简介

Jersey 是开源的 RESTful 框架,实现了 JAX-RS 规范,提供了更多的特性和工具, 可以进一步地简化 RESTful serviceclient 开发,与 Struts 类似,它同样可以和 HibernateSpring 框架整合。此处使用它实现文件上传功能。
引入依赖

pom.xml 中添加 Jersey 相关依赖

com.sun.jersey jersey-client 1.18.1

然后创建一个名为 FileUtils 的文件工具类。
生成临时文件方法

/** * MultipartFile 生成临时文件 * @param multipartFile * @param tempFilePath 临时文件路径 * @return File 临时文件 */ public static File multipartFileToFile(MultipartFile multipartFile, String tempFilePath) {File file = new File(tempFilePath); // 获取文件原名 String originalFilename = multipartFile.getOriginalFilename(); // 获取文件后缀 String suffix = originalFilename.substring(originalFilename.lastIndexOf(".")); if (!file.exists()) { file.mkdirs(); } // 创建临时文件 File tempFile = new File(tempFilePath + "\\" + UUID.randomUUID().toString().replaceAll("-", "") + suffix); try { if (!tempFile.exists()) { // 写入临时文件 multipartFile.transferTo(tempFile); } } catch (IOException e) { e.printStackTrace(); } return tempFile; }

加密/解密文件方法

// 加密/解密文件的密钥 public static final int CRYPTO_SECRET_KEY = 0x99; /** * 加密/解密文件 * @param srcFile 原文件 * @param encFile 加密/解密后的文件 * @return 加密/解密后的文件 * @throws Exception */ public static File cryptoFile(File srcFile, File encFile) throws Exception {InputStream inputStream = new FileInputStream(srcFile); OutputStream outputStream = new FileOutputStream(encFile); while ((FILE_DATA = https://www.it610.com/article/inputStream.read())> -1) { outputStream.write(FILE_DATA ^ CRYPTO_SECRET_KEY); } inputStream.close(); outputStream.flush(); outputStream.close(); return encFile; }

上传文件方法

/** * 上传文件 * @param fileServerPath文件服务器地址 * @param folderPath存放的文件夹路径(比如存放在文件服务器的 upload 文件夹下,即 ”/upload“) * @param uploadFile需要上传的文件 * @param isCrypto是否加密 * @return String文件上传后的全路径 */ public static String uploadByJersey(String fileServerPath, String folderPath, File uploadFile, boolean isCrypto) {String suffix = uploadFile.getName().substring(uploadFile.getName().lastIndexOf(".")); String randomFileName = UUID.randomUUID().toString().replaceAll("-", "") + suffix; String fullPath = fileServerPath + folderPath + "/" + randomFileName; try { if (isCrypto) { // 创建待上传的文件 File cryptoFile = new File(uploadFile.getPath().substring(0, uploadFile.getPath().lastIndexOf(".")) + "crypto" + uploadFile.getPath().substring(uploadFile.getPath().lastIndexOf("."))); // 执行加密并覆盖原文件 uploadFile = cryptoFile(uploadFile, cryptoFile); } // 创建 Jersey 服务器 Client client = Client.create(); WebResource wr = client.resource(fullPath); // 上传文件 wr.put(String.class, fileToByte(uploadFile)); } catch (Exception e) { e.printStackTrace(); } return fullPath; }

下载文件方法

/** * 下载文件 * @param url文件路径 * @param filePath文件保存路径 * @param fileName文件名称(包含文件后缀) * @param isCrypto是否解密 * @return File */ public static File downloadByURL(String url, String filePath, String fileName, boolean isCrypto) {File file = new File(filePath); if (!file.exists()) { file.mkdirs(); } FileOutputStream fileOut; HttpURLConnection httpURLConnection; InputStream inputStream; try { URL httpUrl = new URL(url); httpURLConnection = (HttpURLConnection) httpUrl.openConnection(); httpURLConnection.setDoInput(true); httpURLConnection.setDoOutput(true); httpURLConnection.setUseCaches(false); httpURLConnection.connect(); inputStream = httpURLConnection.getInputStream(); BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream); if (!filePath.endsWith("\\")) { filePath += "\\"; } file = new File(filePath + fileName); fileOut = new FileOutputStream(file); BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOut); byte[] bytes = new byte[4096]; int length = bufferedInputStream.read(bytes); //保存文件 while (length != -1) { bufferedOutputStream.write(bytes, 0, length); length = bufferedInputStream.read(bytes); } bufferedOutputStream.close(); bufferedInputStream.close(); httpURLConnection.disconnect(); } catch (Exception e) { e.printStackTrace(); } if (isCrypto) { try { // 创建解密文件 File cryptoFile = new File(((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest().getServletContext().getRealPath("/") +"\\temp\\" + UUID.randomUUID().toString().replaceAll("-", "") + file.getName().substring(file.getName().lastIndexOf("."))); // 执行解密 cryptoFile(file, cryptoFile); // 删除下载的原文件 file.delete(); // 保存解密后的文件 file = cryptoFile; } catch (Exception e) { e.printStackTrace(); } } return file; }

删除文件方法
【Java 中使用 Jersey 实现上传文件(附加密和解密)】
/** * 删除文件服务器上的文件 * @param url 文件路径 * @return boolean */ public static boolean deleteByJersey(String url) {try { Client client = new Client(); WebResource webResource = client.resource(url); webResource.delete(); return true; } catch (UniformInterfaceException e) { e.printStackTrace(); } catch (ClientHandlerException e) { e.printStackTrace(); } return false; }

完整工具类

import com.sun.jersey.api.client.Client; import com.sun.jersey.api.client.ClientHandlerException; import com.sun.jersey.api.client.UniformInterfaceException; import com.sun.jersey.api.client.WebResource; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletRequest; import java.io.*; import java.net.HttpURLConnection; import java.net.URL; import java.util.UUID; public class FileUtils {// 加密/解密文件的密钥 public static final int CRYPTO_SECRET_KEY = 0x99; public static int FILE_DATA = 0; /** * 加密/解密 文件 * @param srcFile 原文件 * @param encFile 加密/解密后的文件 * @throws Exception */ public static void cryptoFile(File srcFile, File encFile) throws Exception {InputStream inputStream = new FileInputStream(srcFile); OutputStream outputStream = new FileOutputStream(encFile); while ((FILE_DATA = https://www.it610.com/article/inputStream.read())> -1) { outputStream.write(FILE_DATA ^ CRYPTO_SECRET_KEY); } inputStream.close(); outputStream.flush(); outputStream.close(); }/** * MultipartFile 生成临时文件 * @param multipartFile * @param tempFilePath 临时文件路径 * @return File 临时文件 */ public static File multipartFileToFile(MultipartFile multipartFile, String tempFilePath) {File file = new File(tempFilePath); // 获取文件原名 String originalFilename = multipartFile.getOriginalFilename(); // 获取文件后缀 String suffix = originalFilename.substring(originalFilename.lastIndexOf(".")); if (!file.exists()) { file.mkdirs(); } // 创建临时文件 File tempFile = new File(tempFilePath + "\\" + UUID.randomUUID().toString().replaceAll("-", "") + suffix); try { if (!tempFile.exists()) { // 写入临时文件 multipartFile.transferTo(tempFile); } } catch (IOException e) { e.printStackTrace(); } return tempFile; }/** * 上传文件 * @param fileServerPath文件服务器地址 * @param folderPath存放的文件夹路径(比如存放在文件服务器的 upload 文件夹下,即 ”/upload“) * @param uploadFile需要上传的文件 * @param isCrypto是否加密 * @return String文件上传后的全路径 */ public static String uploadByJersey(String fileServerPath, String folderPath, File uploadFile, boolean isCrypto) {String suffix = uploadFile.getName().substring(uploadFile.getName().lastIndexOf(".")); String randomFileName = UUID.randomUUID().toString().replaceAll("-", "") + suffix; String fullPath = fileServerPath + folderPath + "/" + randomFileName; try { if (isCrypto) { // 创建加密文件 File cryptoFile = new File(uploadFile.getPath().substring(0, uploadFile.getPath().lastIndexOf(".")) + "crypto" + uploadFile.getPath().substring(uploadFile.getPath().lastIndexOf("."))); // 执行加密 cryptoFile(uploadFile, cryptoFile); // 保存加密后的文件 uploadFile = cryptoFile; } // 创建 Jersey 服务器 Client client = Client.create(); WebResource wr = client.resource(fullPath); // 上传文件 wr.put(String.class, fileToByte(uploadFile)); } catch (Exception e) { e.printStackTrace(); } return fullPath; }/** * 下载文件 * @param url文件路径 * @param filePath文件保存路径 * @param fileName文件名称(包含文件后缀) * @param isCrypto是否解密 * @return File */ public static File downloadByURL(String url, String filePath, String fileName, boolean isCrypto) {File file = new File(filePath); if (!file.exists()) { file.mkdirs(); } FileOutputStream fileOut; HttpURLConnection httpURLConnection; InputStream inputStream; try { URL httpUrl = new URL(url); httpURLConnection = (HttpURLConnection) httpUrl.openConnection(); httpURLConnection.setDoInput(true); httpURLConnection.setDoOutput(true); httpURLConnection.setUseCaches(false); httpURLConnection.connect(); inputStream = httpURLConnection.getInputStream(); BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream); if (!filePath.endsWith("\\")) { filePath += "\\"; } file = new File(filePath + fileName); fileOut = new FileOutputStream(file); BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOut); byte[] bytes = new byte[4096]; int length = bufferedInputStream.read(bytes); //保存文件 while (length != -1) { bufferedOutputStream.write(bytes, 0, length); length = bufferedInputStream.read(bytes); } bufferedOutputStream.close(); bufferedInputStream.close(); httpURLConnection.disconnect(); } catch (Exception e) { e.printStackTrace(); } if (isCrypto) { try { // 创建解密文件 File cryptoFile = new File(((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest().getServletContext().getRealPath("/") +"\\temp\\" + UUID.randomUUID().toString().replaceAll("-", "") + file.getName().substring(file.getName().lastIndexOf("."))); // 执行解密 cryptoFile(file, cryptoFile); // 删除下载的原文件 file.delete(); // 保存解密后的文件 file = cryptoFile; } catch (Exception e) { e.printStackTrace(); } } return file; }/** * 删除文件服务器上的文件 * @param url 文件路径 * @return boolean */ public static boolean deleteByJersey(String url) {try { Client client = new Client(); WebResource webResource = client.resource(url); webResource.delete(); return true; } catch (UniformInterfaceException e) { e.printStackTrace(); } catch (ClientHandlerException e) { e.printStackTrace(); } return false; }/** * File转Bytes * @param file * @return byte[] */ public static byte[] fileToByte(File file) {byte[] buffer = null; try { FileInputStream fileInputStream = new FileInputStream(file); ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); byte[] bytes = new byte[1024]; int n; while ((n = fileInputStream.read(bytes)) != -1) { byteArrayOutputStream.write(bytes, 0, n); } fileInputStream.close(); byteArrayOutputStream.close(); buffer = byteArrayOutputStream.toByteArray(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return buffer; } }

测试上传

/** * @param multipartFile 上传文件 * @param isCrypto 是否加密文件 * @return */ @Test public String upload(MultipartFile multipartFile, boolean isCrypto) {HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest(); // 生成临时文件 File tempFile = FileUtil.multipartFileToFile(multipartFile, request.getServletContext().getRealPath("/") + "\\static\\temp"); // 上传文件并返回文件路径 String uploadFilePath = FileUtil.uploadByJersey("http://localhost:8080", "/upload", tempFile, isCrypto); if (uploadFilePath != null) { return "上传成功"; } else { return "上传失败"; } }

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