Apache Http客户端4表单发布多部分数据

Question

我需要通过HTTP请求（其中之一是文件）将某些表单参数发布到服务器。所以我使用Apache HTTP客户端是这样的...

HttpPost httpPost = new HttpPost(urlStr); 

params = [] 
params.add(new BasicNameValuePair("username", "bond")); 
params.add(new BasicNameValuePair("password", "vesper")); 
params.add(new BasicNameValuePair("file", payload)); 

httpPost.setEntity(new UrlEncodedFormEntity(params)); 
httpPost.setHeader("Content-type", "multipart/form-data"); 

CloseableHttpResponse response = httpclient.execute(httpPost); 

服务器返回一个错误，堆栈跟踪是..

the request was rejected because no multipart boundary was found 
at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:954) 
at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:331) 
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:351) 
at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126) 
at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:156) 

我从我需要以某种方式拿出其他职位了解边界，这是在内容中找不到的字符串。但是，我如何在上面的代码中创建这个边界？它应该是另一个参数吗？只需要一个代码示例即可。

Answer 1

我接受gustf的答案，因为它摆脱了我是有例外的，所以我认为我是在正确的轨道，但它并不完整。下面是我最后得到它的工作...

File payload = new File("/Users/CasinoRoyaleBank") 
MultipartEntity entity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE); 
entity.addPart("file", new FileBody(payload)) 
entity.addPart("username", new StringBody("bond")) 
entity.addPart("password", new StringBody("vesper")) 
httpPost.setEntity(entity); 
CloseableHttpResponse response = httpclient.execute(httpPost); 

Answer 2

正如例外所述，您尚未指定“多部分边界”。这是一个字符串，充当请求中不同部分之间的分隔符。但在你看来，你似乎没有处理任何不同的部分。

你可能想要使用的是MultipartEntityBuilder，所以你不必担心它是如何工作的。

应该没做到以下几点

 HttpPost httpPost = new HttpPost(urlStr); 

     File payload = new File("/Users/CasinoRoyaleBank"); 

     HttpEntity entity = MultipartEntityBuilder.create() 
       .setMode(HttpMultipartMode.BROWSER_COMPATIBLE) 
       .addBinaryBody("file", payload) 
       .addTextBody("username", "bond") 
       .addTextBody("password", "vesper") 
       .build(); 
     httpPost.setEntity(entity); 

然而，这里应该是下面，但没有使用过时的方法/构造的@AbuMariam发现兼容的版本。

 File payload = new File("/Users/CasinoRoyaleBank"); 

     ContentType plainAsciiContentType = ContentType.create("text/plain", Consts.ASCII); 
     HttpEntity entity = MultipartEntityBuilder.create() 
       .setMode(HttpMultipartMode.BROWSER_COMPATIBLE) 
       .addPart("file", new FileBody(payload)) 
       .addPart("username", new StringBody("bond", plainAsciiContentType)) 
       .addPart("password", new StringBody("vesper", plainAsciiContentType)) 
       .build(); 
     httpPost.setEntity(entity); 

     CloseableHttpResponse response = httpclient.execute(httpPost); 

的UrlEncodedFormEntity通常不用于多，其默认值为内容类型application/x-www-form-urlencoded