java将文件转成流文件返回给前端

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

packagecom.example.pdf.controller;importcom.example.pdf.service.GetFileStreamService;importorg.springframework.web.bind.annotation.GetMapping;importorg.springframework.web.bind.annotation.RequestMapping;importorg.springframework.web.bind.annotation.RestController;importjavax.annotation.Resource;importjavax.servlet.http.HttpServletResponse;/**
 * @author 
 * @date 2024/3/29 16:28
 * @describe
 */@RestController@RequestMapping(value ="test")publicclassGetFileStreamController{@ResourceprivateGetFileStreamService getFileStreamService;/**
     * 获取文件流
     */@GetMapping("getFileStream")publicvoidgetFileStream(HttpServletResponse response){
        getFileStreamService.getFileStream(response);}}

3.service中代码

packagecom.example.pdf.service;importjavax.servlet.http.HttpServletResponse;/**
 * @author 
 * @date 2024/3/29 16:30
 * @describe
 */publicinterfaceGetFileStreamService{/**
     * 获取文件流
     * @param response
     */voidgetFileStream(HttpServletResponse response);}

4.实现类代码

packagecom.example.pdf.service.impl;importcom.example.pdf.service.GetFileStreamService;importorg.springframework.stereotype.Service;importjavax.servlet.http.HttpServletResponse;importjava.io.File;importjava.io.FileInputStream;importjava.io.OutputStream;/**
 * @author
 * @date 2024/3/29 16:31
 * @describe
 */@ServicepublicclassGetFileStreamServiceImplimplementsGetFileStreamService{/**
     * 获取文件流
     */@OverridepublicvoidgetFileStream(HttpServletResponse response){// 指定文件路径，获取file文件File file =newFile("E:\\Desktop\\temps\\test.pdf");try{// 将文件转为文件输入流FileInputStream fileInputStream =newFileInputStream(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 =newbyte[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