Spring boot 文件上传与文件转发

Spring boot 文件上传与文件转发
开发过程中应该离不开文件上传这一关的吧
   例如:  即时通讯和各种社交网站啊，为了让人关注到自己，也为了把自己更好的介绍给别人，头像上传，财务系统  想到财务就想到了excel   整天和excel打交道的人   excel上传，批量数据等
那么Spring boot里面怎么来实现文件上传呢？以及如果只是做文件上传的中转站而目标服务器是在其它地方呢？

新引入的包

[XML]  纯文本查看 复制代码

?

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18

< dependency >              < groupId >org.apache.httpcomponents</ groupId >              < artifactId >httpmime</ artifactId >              < version >4.5.10</ version >          </ dependency >          < dependency >              < groupId >org.apache.httpcomponents</ groupId >              < artifactId >httpclient</ artifactId >              < version >4.5.10</ version >          </ dependency >             <!-- [url]https://mvnrepository.com/artifact/commons-httpclient/commons-httpclient[/url] -->             < dependency >              < groupId >commons-fileupload</ groupId >              < artifactId >commons-fileupload</ artifactId >              < version >1.3.1</ version >          </ dependency >

文件转发的工具类

[Java]  纯文本查看 复制代码

?

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

package com.example.demo.util;    import java.io.IOException; import java.nio.charset.Charset;    import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.ContentType; import org.apache.http.entity.mime.MultipartEntityBuilder; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils; import org.springframework.web.multipart.MultipartFile;       public class HttpClientUtil {         public static String httpClientUploadFile(String url,MultipartFile file) { //        String remote_url = url;// 第三方服务器请求地址          CloseableHttpClient httpClient = HttpClients.createDefault();          String result = "" ;          try {              String fileName = file.getOriginalFilename();              HttpPost httpPost = new HttpPost(url);              MultipartEntityBuilder builder = MultipartEntityBuilder.create();              builder.addBinaryBody( "file" , file.getInputStream(), ContentType.MULTIPART_FORM_DATA, fileName); // 文件流              builder.addTextBody( "type" , "2" ); // 类似浏览器表单提交，对应input的name和value              HttpEntity entity = builder.build();              httpPost.setEntity(entity);              HttpResponse response = httpClient.execute(httpPost); // 执行提交              HttpEntity responseEntity = response.getEntity();              if (responseEntity != null ) {                  // 将响应内容转换为字符串                  result = EntityUtils.toString(responseEntity, Charset.forName( "UTF-8" ));              }          } catch (IOException e) {              e.printStackTrace();          } catch (Exception e) {              e.printStackTrace();          } finally {              try {                  httpClient.close();              } catch (IOException e) {                  e.printStackTrace();              }          }          return result;      } }

[Java]  纯文本查看 复制代码

?

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18

package com.example.demo.config;    import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.multipart.commons.CommonsMultipartResolver;    @Configuration public class ConfigBean {         @Bean      public CommonsMultipartResolver multipartResolver(){          CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();          multipartResolver.setDefaultEncoding( "UTF-8" );          multipartResolver.setMaxUploadSize( 104857600 );          multipartResolver.setMaxInMemorySize( 40960 );          return multipartResolver;      } }

[Java]  纯文本查看 复制代码

?

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

@RequestMapping (value = "/uploadFile/upload" , method = RequestMethod.POST)      @ResponseBody      public String upload( @RequestParam (value = "file" ) MultipartFile file) {          if (file.isEmpty()) {              return "上传失败，请选择文件" ;          }          String filename = UUID.randomUUID().toString();          String suffix = "" ;          String originalFilename = file.getOriginalFilename();          // 截取文件的后缀名          if (originalFilename.contains( "." )) {              suffix = originalFilename.substring(originalFilename.lastIndexOf( "." ));          }          String fileName = filename + suffix;          String filePath = "D:\\A\\B\\D\\" ;          File dest = new File(filePath + fileName);          try {              file.transferTo(dest);              return "上传成功" ;          } catch (IOException e) {          }          return "上传失败！" ;      }         @RequestMapping (value = "/uploadFile/uploadPermanent" , method = RequestMethod.POST)      @ResponseBody      public String uploadPermanent( @RequestParam (value = "file" ) MultipartFile file) {          String url = "http://192.168.1.56:9090" ;          String ss= HttpClientUtil.httpClientUploadFile(url+ "/uploadFile/upload" ,file);          return ss;      }

如图就说明文件上传已经好了 


这里环绕了两次，一次是到中转方法上的，一个是到目标方法上，当然这里是把中转服务器和目标服务器写到了一起，但是场景是满足中转条件的
当然还有非常多的方法来帮助我们办到这些