Spring boot 文件上傳與文件轉發

Spring boot 文件上傳與文件轉發
開發過程中應該離不開文件上傳這一關的吧
   例如:  即時通訊和各種社交網站啊，為了讓人關注到自己，也為了把自己更好的介紹給別人，頭像上傳，財務系統  想到財務就想到了excel   整天和excel打交道的人   excel上傳，批量數據等
那么Spring boot里面怎么來實現文件上傳呢？以及如果只是做文件上傳的中轉站而目標服務器是在其它地方呢？

新引入的包

[XML]  純文本查看 復制代碼

?

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 >

文件轉發的工具類

[Java]  純文本查看 復制代碼

?

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;// 第三方服務器請求地址          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" ); // 類似瀏覽器表單提交，對應input的name和value              HttpEntity entity = builder.build();              httpPost.setEntity(entity);              HttpResponse response = httpClient.execute(httpPost); // 執行提交              HttpEntity responseEntity = response.getEntity();              if (responseEntity != null ) {                  // 將響應內容轉換為字符串                  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]  純文本查看 復制代碼

?

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]  純文本查看 復制代碼

?

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 "上傳失敗，請選擇文件" ;          }          String filename = UUID.randomUUID().toString();          String suffix = "" ;          String originalFilename = file.getOriginalFilename();          // 截取文件的后綴名          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 "上傳成功" ;          } catch (IOException e) {          }          return "上傳失敗！" ;      }         @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;      }

如圖就說明文件上傳已經好了 


這里環繞了兩次，一次是到中轉方法上的，一個是到目標方法上，當然這里是把中轉服務器和目標服務器寫到了一起，但是場景是滿足中轉條件的
當然還有非常多的方法來幫助我們辦到這些