中小企业网站积木式搭建,wordpress 侧边栏代码,简单网站建设,文创产品设计案例及理念前言#xff1a;这边汇总了一下目前SpringBoot项目当中常见文件上传和下载的功能#xff0c;一共三种常见的下载方式和一种上传方式#xff0c;特此做一个笔记分享。 目录
一、pom依赖
二、yml配置文件
三、文件下载
3.1、使用Spring框架提供的下载方式
3.2、通过IOUti… 前言这边汇总了一下目前SpringBoot项目当中常见文件上传和下载的功能一共三种常见的下载方式和一种上传方式特此做一个笔记分享。 目录
一、pom依赖
二、yml配置文件
三、文件下载
3.1、使用Spring框架提供的下载方式
3.2、通过IOUtils以流的形式下载
3.3、边读边下载
四、文件上传
五、工具类完整代码
六、Gitee源码
七、总结 一、pom依赖 dependenciesdependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-web/artifactId/dependencydependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-test/artifactIdscopetest/scope/dependency/dependencies
二、yml配置文件
# Spring配置
spring:# 文件上传servlet:multipart:# 单个文件大小max-file-size: 10MB# 设置总上传的文件大小max-request-size: 20MB
server:port: 9090三、文件下载
3.1、使用Spring框架提供的下载方式
关键代码 /*** 使用Spring框架自带的下载方式* param filePath* param fileName* return*/public ResponseEntityResource download(String filePath,String fileName) throws Exception {fileName URLEncoder.encode(fileName,UTF-8);File file new File(filePath);if(!file.exists()){throw new Exception(文件不存在);}return ResponseEntity.ok().header(HttpHeaders.CONTENT_DISPOSITION,attachment; filename fileName ).body(new FileSystemResource(filePath));}
请求层
RestController
RequestMapping(/file)
public class FileController {Autowiredprivate FileUtil fileUtil;GetMapping(/spring/download)public ResponseEntityResource download() throws Exception {String filePath D:\\1.jpg;String fileName Spring框架下载.jpg;return fileUtil.download(filePath,fileName);}}
浏览器输入http://localhost:9090/file/spring/download 下载完成。
3.2、通过IOUtils以流的形式下载
关键代码 /*** 通过IOUtils以流的形式下载* param filePath* param fileName* param response*/public void download(String filePath , String fileName, HttpServletResponse response) throws Exception {fileName URLEncoder.encode(fileName,UTF-8);File filenew File(filePath);if(!file.exists()){throw new Exception(文件不存在);}response.setHeader(Content-disposition,attachment;filename fileName);FileInputStream fileInputStream new FileInputStream(file);IOUtils.copy(fileInputStream,response.getOutputStream());response.flushBuffer();fileInputStream.close();}
请求层
RestController
RequestMapping(/file)
public class FileController {Autowiredprivate FileUtil fileUtil;GetMapping(/io/download)public void ioDownload(HttpServletResponse response) throws Exception {String filePath D:\\1.jpg;String fileName IO下载.jpg;fileUtil.download(filePath,fileName,response);}}
浏览器访问http://localhost:9090/file/io/download 下载成功。
3.3、边读边下载
关键代码 /*** 原始的方法下载一些小文件边读边下载的* param filePath* param fileName* param response* throws Exception*/public void downloadTinyFile(String filePath,String fileName, HttpServletResponse response)throws Exception{File file new File(filePath);fileName URLEncoder.encode(fileName, UTF-8);if(!file.exists()){throw new Exception(文件不存在);}FileInputStream in new FileInputStream(file);response.setHeader(Content-Disposition, attachment;filenamefileName);OutputStream out response.getOutputStream();byte[] b new byte[1024];int len 0;while((len in.read(b))!-1){out.write(b, 0, len);}out.flush();out.close();in.close();}
请求层
RestController
RequestMapping(/file)
public class FileController {Autowiredprivate FileUtil fileUtil;GetMapping(/tiny/download)public void tinyDownload(HttpServletResponse response) throws Exception {String filePath D:\\1.jpg;String fileName tiny下载.jpg;fileUtil.downloadTinyFile(filePath,fileName,response);}}浏览器输入http://localhost:9090/file/tiny/download 下载成功。
四、文件上传
使用MultipartFile上传文件 /*** 上传文件* param multipartFile* param storagePath* return* throws Exception*/public String upload(MultipartFile multipartFile, String storagePath) throws Exception{if (multipartFile.isEmpty()) {throw new Exception(文件不能为空);}String originalFilename multipartFile.getOriginalFilename();String newFileName UUID.randomUUID()_originalFilename;String filePath storagePathnewFileName;File file new File(filePath);if (!file.getParentFile().exists()) {file.getParentFile().mkdirs();}multipartFile.transferTo(file);return filePath;}
请求层
RestController
RequestMapping(/file)
public class FileController {Autowiredprivate FileUtil fileUtil;PostMapping(/multipart/upload)public String download(MultipartFile file) throws Exception {String storagePath D:\\;return fileUtil.upload(file,storagePath);}}
使用postman工具测试 在D盘找到此文件。
五、工具类完整代码
package com.example.file.utils;import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.util.UUID;/*** 文件工具类* author HTT*/
Component
public class FileUtil {/*** 使用Spring框架自带的下载方式* param filePath* param fileName* return*/public ResponseEntityResource download(String filePath,String fileName) throws Exception {fileName URLEncoder.encode(fileName,UTF-8);File file new File(filePath);if(!file.exists()){throw new Exception(文件不存在);}return ResponseEntity.ok().header(HttpHeaders.CONTENT_DISPOSITION,attachment; filename fileName ).body(new FileSystemResource(filePath));}/*** 通过IOUtils以流的形式下载* param filePath* param fileName* param response*/public void download(String filePath , String fileName, HttpServletResponse response) throws Exception {fileName URLEncoder.encode(fileName,UTF-8);File filenew File(filePath);if(!file.exists()){throw new Exception(文件不存在);}response.setHeader(Content-disposition,attachment;filename fileName);FileInputStream fileInputStream new FileInputStream(file);IOUtils.copy(fileInputStream,response.getOutputStream());response.flushBuffer();fileInputStream.close();}/*** 原始的方法下载一些小文件边读边下载的* param filePath* param fileName* param response* throws Exception*/public void downloadTinyFile(String filePath,String fileName, HttpServletResponse response)throws Exception{File file new File(filePath);fileName URLEncoder.encode(fileName, UTF-8);if(!file.exists()){throw new Exception(文件不存在);}FileInputStream in new FileInputStream(file);response.setHeader(Content-Disposition, attachment;filenamefileName);OutputStream out response.getOutputStream();byte[] b new byte[1024];int len 0;while((len in.read(b))!-1){out.write(b, 0, len);}out.flush();out.close();in.close();}/*** 上传文件* param multipartFile* param storagePath* return* throws Exception*/public String upload(MultipartFile multipartFile, String storagePath) throws Exception{if (multipartFile.isEmpty()) {throw new Exception(文件不能为空);}String originalFilename multipartFile.getOriginalFilename();String newFileName UUID.randomUUID()_originalFilename;String filePath storagePathnewFileName;File file new File(filePath);if (!file.getParentFile().exists()) {file.getParentFile().mkdirs();}multipartFile.transferTo(file);return filePath;}}六、Gitee源码
码云地址SpringBoot实现文件上传和下载
七、总结
以上就是SpringBoot实现文件上传和下载功能的笔记一键复制使用即可。
