使用Android通过JSON上传照片到服务器

Question

我正尝试将照片上传到我的服务器。但是我对如何以JSON提交多部分请求感到困惑。这是我迄今为止的代码。

// Set up HTTP client. 
HttpClient client = DefaultHttpClient(); 

// Multi-part content body. 
MultipartEntity mpEntity = new MultipartEntity(); 
ContentBody content = new FileBody(source, "image/jpeg"); 
mpEntity.addPart("user[photo]", content); 

// Put method. 
HttpPut method = new HttpPut(url); 
method.setHeader("Accept", "application/json"); 
method.setHeader("Content-type", "application/json"); 
method.setHeader("Accept-Encoding", "gzip"); 
method.setEntity(mpEntity); 
response = client.execute(method); 

// Result. 
HttpEntity responseEntity = response.getEntity(); 

我从我的Rails服务器得到的错误是：

所有的

Error occurred while parsing request parameters. 
Contents: [garbled data] 

Answer 1

这适用于Rails服务器。

// Target URL. 
// Add '.json' to end of the URL. This will make Rails 
// accept the request as JSON but yet allow the multi-part content 
// encoding below. 
String url = "http://blahblah.com/users/123.json" 

// Set up HTTP client. 
HttpClient client = DefaultHttpClient(); 

// Multi-part content body. 
MultipartEntity mpEntity = new MultipartEntity(); 
ContentBody content = new FileBody(source, "image/jpeg"); 
mpEntity.addPart("user[photo]", content); 

// Put method. 
HttpPut method = new HttpPut(url); 
method.setEntity(mpEntity); 
response = client.execute(method); 

// Result. 
HttpEntity responseEntity = response.getEntity(); 

工程！

Answer 2

首先，这是不特定的Android在所有。这属于HTTP相关的问题。我会回答它。

使用application/json内容类型不能发送多部分http消息。您应该在消息中使用适当的多部分内容类型。虽然在你的例子中你只传递一个部分，所以在技术上不需要多部分。但是，这取决于您的Rails服务器作为请求的期望。