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  */ @Service public 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