Question

我最近使用Spring 4，编写RESTful控制器通常没问题。有一个遗留的Web应用程序，它使用java.net.HTTPUrlConnection进行多部分上传。我们上传了3条数据： 1是PDF文件，我们有字节，然后其他两个数据只是2个字符串字段。

首先让我向您展示Spring REST控制器以接受数据：

@RequestMapping(value = "/save", method = RequestMethod.POST, produces = "application/json", consumes = "multipart/form-data")
public @ResponseBody boolean saveData(@RequestPart(value = "field1") String field1, @RequestPart(value = "field2") String field2, @RequestParam(value = "pdfbytes") String pdfbytes)
{
    System.out.println("saveData: field1=" + field1);
    System.out.println("saveData: field2=" + field2);
    System.out.println("saveData: pdfbytes=" + pdfbytes);
    boolean response = true;

    return response;
}

前端的代码，用于使用＆＃39; java.net.HttpURLConnection＆＃39;发送数据。看起来像这样：

String boundary = MultiPartFormOutputStream.createBoundary();

URL uploadDocumentUrl = new URL(protocol + "://" + host + UPLOAD_EDITED_DOCUMENT);

    HttpURLConnection urlConn = (HttpURLConnection) MultiPartFormOutputStream.createConnection(uploadDocumentUrl);
    urlConn.setRequestProperty("Content-Type", MultiPartFormOutputStream.getContentType(boundary));
    urlConn.setRequestProperty("Connection", "Keep-Alive");
    urlConn.setRequestProperty("Cache-Control", "no-cache");
    urlConn.setRequestProperty("User-Agent", userAgent);
    urlConn.setRequestMethod("POST");

    MultiPartFormOutputStream out = new MultiPartFormOutputStream(urlConn.getOutputStream(), boundary);

    String pdfbytes= getEncodedDocument(pdf);

    out.writeField("field1", field1);
    out.writeField("field2", field2);
    out.writeField("pdfbytes", pdfbytes);

    out.close();
    int responseCode = urlConn.getResponseCode();
    String responseMessage = urlConn.getResponseMessage();

＆＃34; MultiPartFormOutputStream＆＃34;是一个自定义对象，它是为通过HttpUrlConnection发送数据而创建的，它是非常标准的代码。我现在确实相信它。

那么，根据我们发送数据的方式，我是否需要更改Controller以执行任何不同的操作，或者看起来不错？

现在这里是代码，我用于单元测试控制器：

@Test
public void testMockUpload() throws Exception
{
    // Load resource being uploaded
    byte[] pdfbytes = getByteArrayFromFile(FILENAME);

    MockMultipartFile firstFile = new MockMultipartFile("field1", "", "text/plain", "field1 data".getBytes());
    MockMultipartFile secondFile = new MockMultipartFile("field2", "", "text/plain", "field2 data".getBytes());
    MockMultipartFile jsonFile = new MockMultipartFile("pdfbytes", "", "text/plain", pdfbytes);

    MockHttpServletRequestBuilder requestBuilder = MockMvcRequestBuilders.fileUpload(BASE_URL + "/save").file(firstFile).file(secondFile).file(jsonFile)
    .with(user(USERNAME).roles("role1", "role2")).contentType(MediaType.MULTIPART_FORM_DATA_VALUE);

    this.mockMvc.perform(requestBuilder).andDo(print()).andExpect(status().isOk());
}

我现在得到的错误是： org.springframework.web.method.annotation.MethodArgumentConversionNotSupportedException

我正在调查。如果我需要对如何创建测试进行任何更改，我对此非常开放。最终，我将在发送代码，接收控制器和单元测试之间进行同步。

提前致谢！像往常一样，如果有任何其他数据或信息，我可以提供，请告诉我。谢谢！

Answer 1

要上传一个文件，您可以将RequestParam类型定义为org.springframework.web.multipart.MultipartFile;

@RequestMapping(value = "/save", method = RequestMethod.POST, produces = "application/json", consumes = "multipart/form-data")
            public @ResponseBody boolean saveData(@RequestParam(value = "file") MultipartFile file)
            {
                return response;
            }

对于多个文件，我尝试创建一个Wrapper表单：

public class UploadForm{

   private List<MultipartFile> files;
}

在控制器中绑定到此：

@RequestMapping(value = "/save", method = RequestMethod.POST, produces = "application/json", consumes = "multipart/form-data")
    public @ResponseBody boolean saveData(@ModelAttribute uploadForm)
    {
        return response;
    }

然后使用Spring对索引字段的支持来绑定到集合：

测试：

MockMultipartFile firstFile = new MockMultipartFile("files[0]", "", "text/plain", "field1 data".getBytes());
    MockMultipartFile secondFile = new MockMultipartFile("files[1]", "", "text/plain", "field2 data".getBytes());
    MockMultipartFile jsonFile = new MockMultipartFile("files[2]", "", "text/plain", pdfbytes);

客户端：

out.writeField("files[0]", file1Bytes);
out.writeField("files[1]", file2Bytes);
...

使用多部分数据和单元测试进行Spring MVC文件上传

1 个答案: