Java 文件下载服务端

import org.springframework.http.HttpHeaders; import org.springframework.web.bind.annotation.*; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletResponse; import java.io.*; import java.net.URLEncoder; import java.util.List; @RestController public class DownloadController { public static void main(String[] args) { } /** * @RequestBody String str : 接收单个参数（接收JSON字符串后可格式化为JSON对象解析） * @RequestBody FileDTO fileDTO : 接收JSON参数 */ @RequestMapping(value = "download", method = RequestMethod.GET) public void download(HttpServletResponse response) throws IOException { FileInputStream in = null; BufferedInputStream bfIn = null; ServletOutputStream outputStream = null; File file = null; try { String filePath = System.getProperty("user.dir") + "\\" + "155.pdf"; System.out.println("filePath = [" + filePath + "]"); file = new File(filePath); in = new FileInputStream(file); bfIn = new BufferedInputStream(in); // 图片 // response.setContentType("image/jpeg"); // pdf文件 response.setContentType("application/pdf"); response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filePath.substring(0, filePath.lastIndexOf(".")), "utf-8") + filePath.substring(filePath.lastIndexOf("."))); outputStream = response.getOutputStream(); byte[] buff = new byte[1024]; int len; while ((len = bfIn.read(buff)) != -1) { outputStream.write(buff, 0 , buff.length); } } catch (Exception e) { throw e; } finally { if (outputStream != null) { outputStream.close(); } if (bfIn != null) { bfIn.close(); } if (in != null) { in.close(); } } } /** * 从请求头（HttpHeaders）中获取文件名（单个文件） * @param response 响应对象 * @param headers 请求头 * @throws IOException */ @RequestMapping(value = "download2", method = RequestMethod.POST) public void download(HttpServletResponse response, @RequestHeader HttpHeaders headers) throws IOException { FileInputStream in = null; BufferedInputStream bfIn = null; ServletOutputStream outputStream = null; File file = null; try { System.out.println("headers = [" + headers.size() + "]"); // 从请求头获取文件名 List<String> fileNameList = headers.get("fileName"); String fileName = fileNameList.get(0); System.out.println("fileName = [" + fileName + "]"); String filePath = System.getProperty("user.dir") + "\\" + fileName; System.out.println("filePath = [" + filePath + "]"); file = new File(filePath); in = new FileInputStream(file); bfIn = new BufferedInputStream(in); // 图片 // response.setContentType("image/jpeg"); // pdf文件 response.setContentType("application/pdf"); response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName.substring(0, fileName.indexOf(".")), "utf-8") + filePath.substring(filePath.lastIndexOf("."))); outputStream = response.getOutputStream(); byte[] buff = new byte[1024]; int len; while ((len = bfIn.read(buff)) != -1) { outputStream.write(buff, 0 , buff.length); } } catch (Exception e) { throw e; } finally { if (outputStream != null) { outputStream.close(); } if (bfIn != null) { bfIn.close(); } if (in != null) { in.close(); } } } } download1 请求示例：

download2 请求示例：