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

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