给Java接口

二、下载文件1、前端调用Java接口下载文件2、Java接口下载网络文件到本地3、前端调用Java接口下载网络文件

一、上传文件

org.springframework.web.bind.annotation.PostMapping;

import

org.springframework.web.bind.annotation.RequestPart;

import

org.springframework.web.bind.annotation.RestController;

import

org.springframework.web.multipart.MultipartFile;import

java.io.File;

return*/PostMapping(/upload)public

String

{log.info(上传的信息headerImg{}photos{},headerImg.getSize(),photos.length);if(!headerImg.isEmpty()){//保存到文件服务器OSS服务器String

originalFilename

headerImg.getOriginalFilename();headerImg.transferTo(new

File(E:\\workspace\\boot-05-web-01\\headerImg\\originalFilename));}if(photos.length

0){for

photo.getOriginalFilename();photo.transferTo(new

File(E:\\workspace\\boot-05-web-01\\photos\\originalFilename));}}}return

OK;}}yaml配置

spring:servlet:multipart:max-file-size:

10MB

单次请求上传文件最大值file-size-threshold:

4KB

我这里是将前端接收过来的文件转发到另外一个接口也就是一种上传操作。

如果你要将本地文件上传过去那么修改下代码读取本地文件格式转化一下即可。

RestTemplateConfig

org.springframework.context.annotation.Bean;

import

org.springframework.context.annotation.Configuration;

import

org.springframework.web.client.RestTemplate;Configuration

public

{log.info(上传的信息headerImg{}photos{},headerImg.getSize(),photos.length);String

urlhttp://127.0.0.1:8080//upload2;//封装请求头HttpHeaders

httpHeaders

HttpHeaders();httpHeaders.set(Content-Type,

MediaType.MULTIPART_FORM_DATA_VALUE

;charsetUTF-8);httpHeaders.set(test1,

Object

LinkedMultiValueMap();//文件处理FileSystemResource

headerImgFile

FileSystemResource(multipartFile2File(headerImg));form.add(headerImg,

headerImgFile);FileSystemResource[]

photosArr

FileSystemResource[photos.length];for

(int

FileSystemResource(multipartFile2File(photos[i]));form.add(photos,

photosArr[i]);}HttpEntityMultiValueMapString,

Object

restTemplate.postForObject(url,

result;}private

multipartFile.getOriginalFilename();//

获取文件前缀String

fileName.lastIndexOf(.));//获取文件后缀String

suffix

fileName.substring(fileName.lastIndexOf(.));try

file

suffix);//将原文件转换成新建的临时文件multipartFile.transferTo(file);file.deleteOnExit();return

file;}

{if(!headerImg.isEmpty()){//保存到文件服务器OSS服务器String

originalFilename

headerImg.getOriginalFilename();headerImg.transferTo(new

File(E:\\workspace\\boot-05-web-01\\headerImg\\originalFilename));}if(photos.length

0){for

photo.getOriginalFilename();photo.transferTo(new

File(E:\\workspace\\boot-05-web-01\\photos\\originalFilename));}}}return

upload2

org.springframework.core.io.Resource;

import

org.springframework.http.HttpHeaders;

import

org.springframework.http.ResponseEntity;

import

org.springframework.web.bind.annotation.GetMapping;

import

org.springframework.web.bind.annotation.PathVariable;

import

org.springframework.web.bind.annotation.RequestMapping;

import

org.springframework.web.bind.annotation.RestController;

import

org.springframework.web.servlet.support.ServletUriComponentsBuilder;import

java.io.IOException;

E:\\workspace\\boot-05-web-01\\photos;GetMapping(/files/{fileName:.})public

String

Paths.get(FILE_DIRECTORY).resolve(fileName).normalize();Resource

resource

FileUrlResource(String.valueOf(filePath));if

(!resource.exists())

HttpHeaders();headers.add(HttpHeaders.CONTENT_DISPOSITION,

attachment;

ResponseEntity.ok().headers(headers).body(resource);}}测试方法

http://127.0.0.1:8080/files/andriod1749898216865912222.jpg

2、Java接口下载网络文件到本地

GetMapping(/downloadNetFileToLocal)public

Object

downloadNetFileToLocal(RequestParam(url)

String

fileUrl.split(/)[fileUrl.split(/).length-1];URL

url

url.openConnection();connection.setRequestMethod(GET);connection.setConnectTimeout(5000);InputStream

inputStream

connection.getInputStream();FileOutputStream

fileOutputStream

FileOutputStream(E:\\workspace\\boot-05-web-01\\photos\\fileName);byte[]

buffer

byteread;fileOutputStream.write(buffer,0,byteread);}fileOutputStream.close();result.put(bytes,bytesum);result.put(code,200);return

http://127.0.0.1:8080/downloadNetFileToLocal?urlhttps://img-blog.csdnimg.cn/166e183e84094c44bbc8ad66500cef5b.jpeg

3、前端调用Java接口下载网络文件

GetMapping(/downloadNetFile)public

ResponseEntity?

downloadNetFile(RequestParam(url)

String

fileUrl.split(/)[fileUrl.split(/).length-1];URL

url

url.openConnection();connection.setRequestMethod(GET);connection.setConnectTimeout(5000);InputStream

inputStream

connection.getInputStream();byte[]

bytes

streamToByteArray(inputStream);HttpHeaders

headers

HttpHeaders();headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);headers.setContentLength(bytes.length);headers.setContentDispositionFormData(attachment,

fileName);return

ByteArrayOutputStream();//创建输出流对象byte[]

new

bos.toByteArray();bos.close();return

array;}测试地址http://127.0.0.1:8080/downloadNetFile?urlhttps://img-blog.csdnimg.cn/166e183e84094c44bbc8ad66500cef5b.jpeg