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因此,我最近将Volley API集成到了我的应用中以提供云存储解决方案(REST)。因为,在尝试通过HTTP POST发送RDF(文本/海龟)数据之前,我从来没有使用API。由于我发送GET和POST请求(通过Postman Chrome应用程序),每当我收到200和201响应时,REST服务器都能正常工作。虽然我设法通过API发送一个简单的GET请求,但是当我发送HTTP POST时,发生了400错误。使用Google volley API发送RDF数据的HTTP POST请求
的代码如下:
//the RDF turtle payload to send over HTTP POST
final String bodyPost = "@prefix : <http://xxx.xxx.xxx.gr/xxx/schema/xxx#> ." + "\n" +
"@prefix xsd: <http://www.w3.org/2001/XMLSchema#> ." + "\n" +
"[a :Patient ;" + "\n" +
":lastName "+'"'+"Aylakiotis"+'"'+"^^xsd:string ; " + "\n" +
":firstName "+'"'+"Yiannis"+'"'+"^^xsd:string ;" + "\n" +
":dateOfBirth "+'"'+"1970-04-14"+'"'+"^^xsd:date ;" + "\n" +
":amka "+'"'+"12345678903"+'"'+"^^xsd:string ;" + "\n" +
":gender :Male ;" + "\n" +
"] .";
RequestQueue queue = Volley.newRequestQueue(this);
final String URL ="http://xxx.xxx.xxx:8080/xxx/";
EditText folderTitle = (EditText) findViewById(R.id.folderTitle);
StringRequest strReq = new StringRequest(Request.Method.POST, URL,
new Response.Listener() {
@Override
public void onResponse(Object response) {
folderTitle.setText("Response is: " + response.toString().substring(0,500));
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
folderTitle.setText("Error: " + error.getMessage());
}
}) {
@Override
public byte[] getBody() throws AuthFailureError {
System.out.println("string post data: " + bodyPost);
if (params != null && params.size() > 0) {
System.out.println("string post data: " + bodyPost);
return encodeParameters(params, getParamsEncoding());
}
return bodyPost.getBytes();
}
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = new HashMap<String, String>();
String creds = String.format("%s:%s", "xxx", "xxx");
String auth = "Basic " + Base64.encodeToString(creds.getBytes(), Base64.DEFAULT);
headers.put("Authorization", auth);
headers.put("Content-Type", "text/turtle");
return headers;
}
};
// Add the request to the RequestQueue.
queue.add(strReq);
String bodyPost
是数据的有效载荷,我想在一个龟RDF格式发送。我把这个放在我的getBody()
方法中,但是我仍然收到了400个错误的请求。我已经通过Postman Chrome应用程序通过POST http发送了此字符串,并且它可以工作(201 Created)。我看到大多数实现都有getParams()
,但是这需要键/值对,而我正在使用三元组,我想整个发送一串原始数据。