spring：文件上传RESTFUL Web服务

• Z时代
• 2024-01-10
• 分类：问答

我正在使用Spring 4.0为RESTFUL Web服务创建POC。如果仅传递String或任何其他基本数据类型，则效果很好。

@RequestMapping(value="/upload/file", method=RequestMapping.post)
public String uploadFile(@RequestParam("fileName", required=false) String fileName){
    logger.info("initialization of object");
    //----------------------------------------
     System.out.Println("name of File : " + fileName);
    //----------------------------------------
}

这很好。但是，如果我想将字节流或文件对象传递给函数，如何编写具有这些参数的函数？以及如何编写具有传递字节流功能的Client？

@RequestMapping(value="/upload/file", method=RequestMapping.post)
public String uploadFile(@RequestParam("file", required=false) byte [] fileName){
     //---------------------
     // 
}

我尝试了此代码，但收到415错误。

@RequestMapping(value = "/upload/file", method = RequestMethod.POST, consumes="multipart/form-data")
public @ResponseBody String uploadFileContentFromBytes(@RequestBody MultipartFormDataInput input,  Model model) {
    logger.info("Get Content. "); 
  //------------
   }

客户端代码-使用apache HttpClient

private static void executeClient() {
    HttpClient client = new DefaultHttpClient();
    HttpPost postReqeust = new HttpPost(SERVER_URI + "/file");
    try{
        // Set Various Attributes
        MultipartEntity multipartEntity = new MultipartEntity();
        multipartEntity.addPart("fileType" , new StringBody("DOCX"));
        FileBody fileBody = new FileBody(new File("D:\\demo.docx"), "application/octect-stream");
        // prepare payload
        multipartEntity.addPart("attachment", fileBody);
        //Set to request body
        postReqeust.setEntity(multipartEntity);
        HttpResponse response = client.execute(postReqeust) ;
        //Verify response if any
        if (response != null)
        {
            System.out.println(response.getStatusLine().getStatusCode());
        }
    }
    catch(Exception ex){
        ex.printStackTrace();
    }

回答：

您可以如下创建您的休息服务。

@RequestMapping(value="/upload", method=RequestMethod.POST)
    public @ResponseBody String handleFileUpload( 
            @RequestParam("file") MultipartFile file){
            String name = "test11";
        if (!file.isEmpty()) {
            try {
                byte[] bytes = file.getBytes();
                BufferedOutputStream stream = 
                        new BufferedOutputStream(new FileOutputStream(new File(name + "-uploaded")));
                stream.write(bytes);
                stream.close();
                return "You successfully uploaded " + name + " into " + name + "-uploaded !";
            } catch (Exception e) {
                return "You failed to upload " + name + " => " + e.getMessage();
            }
        } else {
            return "You failed to upload " + name + " because the file was empty.";
        }
    }

对于客户端，请执行以下操作。

import java.io.File;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.ContentBody;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.util.EntityUtils;
public class Test {
  public static void main(String[] args) throws Exception {
    HttpClient httpclient = new DefaultHttpClient();
    httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
    HttpPost httppost = new HttpPost("http://localhost:8080/upload");
    File file = new File("C:\\Users\\Kamal\\Desktop\\PDFServlet1.pdf");
    MultipartEntity mpEntity = new MultipartEntity();
    ContentBody cbFile = new FileBody(file, "multipart/form-data");
    mpEntity.addPart("file", cbFile);
    httppost.setEntity(mpEntity);
    System.out.println("executing request " + httppost.getRequestLine());
    HttpResponse response = httpclient.execute(httppost);
    HttpEntity resEntity = response.getEntity();
    System.out.println(response.getStatusLine());
    if (resEntity != null) {
      System.out.println(EntityUtils.toString(resEntity));
    }
    if (resEntity != null) {
      resEntity.consumeContent();
    }
    httpclient.getConnectionManager().shutdown();
  }
}

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