环境：jdk1.8，springboot2.5.3,项目端口号：9100

1.待转换的文件

一、路径

二、文件内容

2.controller中代码

package com.example.pdf.controller;import com.example.pdf.service.GetFileStreamService;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;import javax.servlet.http.HttpServletResponse;/** * @author * @date 2024/3/29 16:28 * @describe */@RestController@RequestMapping(value = "test")public class GetFileStreamController { @Resource private GetFileStreamService getFileStreamService;/** * 获取文件流 */ @GetMapping("getFileStream") public void getFileStream(HttpServletResponse response) { getFileStreamService.getFileStream(response); }}

3.service中代码

package com.example.pdf.service;import javax.servlet.http.HttpServletResponse;/** * @author * @date 2024/3/29 16:30 * @describe */public interface GetFileStreamService { /** * 获取文件流 * @param response */ void getFileStream(HttpServletResponse response);}

4.实现类代码

package com.example.pdf.service.impl;import com.example.pdf.service.GetFileStreamService;import org.springframework.stereotype.Service;import javax.servlet.http.HttpServletResponse;import java.io.File;import java.io.FileInputStream;import java.io.OutputStream;/** * @author * @date 2024/3/29 16:31 * @describe */@Servicepublic class GetFileStreamServiceImpl implements GetFileStreamService { /** * 获取文件流 */ @Override public void getFileStream(HttpServletResponse response) { // 指定文件路径，获取file文件 File file = new File("E:\\Desktop\\temps\\test.pdf"); try { // 将文件转为文件输入流 FileInputStream fileInputStream = new FileInputStream(file); // 获取响应的输出流 OutputStream outputStream = response.getOutputStream(); // 将文件转成字节数组，再将数组写入响应的输出流 byte[] buffer = new byte[1024]; int bytesRead = -1; while ((bytesRead = fileInputStream.read(buffer)) != -1) { outputStream.write(buffer, 0, bytesRead); } // 刷新输出流 outputStream.flush(); // 关闭流 fileInputStream.close(); outputStream.close(); } catch (Exception e) { e.printStackTrace(); } }}

5.postman中访问结果示例

6.浏览器中访问结果示例