如何解决使用 JsonObjectRequest 和 GET 请求发送 JSON 正文
我需要通过 get 方法发送一个 json 代码。 我尝试通过带有方法、url 和参数的 JsonObjectRequest 发送，响应为空且未发送 json。
JSONObject request = new JSONObject();
try {
request.put("CodigoInicial","1");
request.put("CodigoFinal","2");
;
} catch (JSONException e) {
e.printstacktrace();
}
// Make request for JSONObject
JsonObjectRequest jsonObjReq = new JsonObjectRequest(
Request.Method.GET,url2,request,new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
// Log.d(TAG,response.toString() + " i am queen");
try {
JSONArray jsonArray = response.getJSONArray("LinhasClientes");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject employee = jsonArray.getJSONObject(i);
int codigo = employee.getInt("Codigo");
String Nome = employee.getString("Nome");
String NumContrib = employee.getString("NumContrib");
//textView.append(Nome + "," + String.valueOf(codigo) + "," + NumContrib + "\n\n");
}
} catch (JSONException e) {
e.printstacktrace();
}
Toast.makeText(getApplicationContext(),response.toString()+"i am queen",Toast.LENGTH_SHORT).show();
}
},new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
//VolleyLog.d(TAG,"Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),error.getMessage(),Toast.LENGTH_SHORT).show();
}
}) {
/**
* Passing some request headers
*/
@Override
public Map<String,String> getHeaders() throws AuthFailureError {
HashMap<String,String> headers = new HashMap<String,String>();
headers.put("Content-Type","application/json; charset=utf-8");
headers.put("CodigoInicial","1");
headers.put("C`enter code here`odigoFinal","2");
return headers;
}
};
// Adding request to request queue
Volley.newRequestQueue(this).add(jsonObjReq);
解决方法
问题是 com.android.volley.toolbox.HttpClientStack.java 中 createHttpRequest 方法的实现，只有当请求方法是 POST、PUT 或 PATCH 时才会添加正文。
/**
* Creates the appropriate subclass of HttpUriRequest for passed in request.
*/
@SuppressWarnings("deprecation")
/* protected */ static HttpUriRequest createHttpRequest(Request<?> request,Map<String,String> additionalHeaders) throws AuthFailureError {
switch (request.getMethod()) {
case Method.DEPRECATED_GET_OR_POST: {
// This is the deprecated way that needs to be handled for backwards compatibility.
// If the request's post body is null,then the assumption is that the request is
// GET. Otherwise,it is assumed that the request is a POST.
byte[] postBody = request.getPostBody();
if (postBody != null) {
HttpPost postRequest = new HttpPost(request.getUrl());
postRequest.addHeader(HEADER_CONTENT_TYPE,request.getPostBodyContentType());
HttpEntity entity;
entity = new ByteArrayEntity(postBody);
postRequest.setEntity(entity);
return postRequest;
} else {
return new HttpGet(request.getUrl());
}
}
case Method.GET:
return new HttpGet(request.getUrl());
case Method.DELETE:
return new HttpDelete(request.getUrl());
case Method.POST: {
HttpPost postRequest = new HttpPost(request.getUrl());
postRequest.addHeader(HEADER_CONTENT_TYPE,request.getBodyContentType());
setEntityIfNonEmptyBody(postRequest,request);
return postRequest;
}
case Method.PUT: {
HttpPut putRequest = new HttpPut(request.getUrl());
putRequest.addHeader(HEADER_CONTENT_TYPE,request.getBodyContentType());
setEntityIfNonEmptyBody(putRequest,request);
return putRequest;
}
case Method.HEAD:
return new HttpHead(request.getUrl());
case Method.OPTIONS:
return new HttpOptions(request.getUrl());
case Method.TRACE:
return new HttpTrace(request.getUrl());
case Method.PATCH: {
HttpPatch patchRequest = new HttpPatch(request.getUrl());
patchRequest.addHeader(HEADER_CONTENT_TYPE,request.getBodyContentType());
setEntityIfNonEmptyBody(patchRequest,request);
return patchRequest;
}
default:
throw new IllegalStateException("Unknown request method.");
}
}
因此您必须使用自己的 HttpStack.java 实现或覆盖 HttpClientStack 类。
首先你应该从
替换你对RequestQueue的初始化RequestQueue requestQueue = Volley.newRequestQueue(sContext);
到
String userAgent = "volley/0";
try {
String packageName = getContext().getPackageName();
PackageInfo info = getContext().getPackageManager().getPackageInfo(packageName,0);
userAgent = packageName + "/" + info.versionCode;
} catch (PackageManager.NameNotFoundException e) {}
HttpStack httpStack = new OwnHttpClientStack(AndroidHttpClient.newInstance(userAgent));
RequestQueue requesQueue = Volley.newRequestQueue(sContext,httpStack);
并编写您自己的 HttpClientStack 实现，您可以在方法 createHttpRequest() 中更改“Method.POST:”的大小写。您还必须创建一个像“OwnHttpDelete”这样的对象作为 HttpEntityEnclosureRequestBase 的扩展，才能使用 setEntityIfNonEmptyBody() 方法。
public class OwnHttpClientStack extends com.android.volley.toolbox.HttpClientStack {
private final static String HEADER_CONTENT_TYPE = "Content-Type";
public OwnHttpClientStack(HttpClient client) {
super(client);
}
@Override
public HttpResponse performRequest(Request<?> request,String> additionalHeaders)
throws IOException,AuthFailureError {
HttpUriRequest httpRequest = createHttpRequest(request,additionalHeaders);
addHeaders(httpRequest,request.getHeaders());
onPrepareRequest(httpRequest);
HttpParams httpParams = httpRequest.getParams();
int timeoutMs = request.getTimeoutMs();
// TODO: Reevaluate this connection timeout based on more wide-scale
// data collection and possibly different for wifi vs. 3G.
HttpConnectionParams.setConnectionTimeout(httpParams,5000);
HttpConnectionParams.setSoTimeout(httpParams,timeoutMs);
return mClient.execute(httpRequest);
}
private static void addHeaders(HttpUriRequest httpRequest,String> headers) {
for (String key : headers.keySet()) {
httpRequest.setHeader(key,headers.get(key));
}
}
static HttpUriRequest createHttpRequest(Request<?> request,String> additionalHeaders) throws AuthFailureError {
switch (request.getMethod()) {
case Request.Method.DEPRECATED_GET_OR_POST: {
byte[] postBody = request.getPostBody();
if (postBody != null) {
HttpPost postRequest = new HttpPost(request.getUrl());
postRequest.addHeader(HEADER_CONTENT_TYPE,request.getPostBodyContentType());
HttpEntity entity;
entity = new ByteArrayEntity(postBody);
postRequest.setEntity(entity);
return postRequest;
} else {
return new HttpGet(request.getUrl());
}
}
case Request.Method.GET:
return new HttpGet(request.getUrl());
case Request.Method.DELETE:
OwnHttpDelete deleteRequest = new OwnHttpDelete(request.getUrl());
deleteRequest.addHeader(HEADER_CONTENT_TYPE,request.getBodyContentType());
setEntityIfNonEmptyBody(deleteRequest,request);
return deleteRequest;
case Request.Method.POST: {
HttpPost postRequest = new HttpPost(request.getUrl());
postRequest.addHeader(HEADER_CONTENT_TYPE,request.getBodyContentType());
setEntityIfNonEmptyBody(postRequest,request);
return postRequest;
}
case Request.Method.PUT: {
HttpPut putRequest = new HttpPut(request.getUrl());
putRequest.addHeader(HEADER_CONTENT_TYPE,request.getBodyContentType());
setEntityIfNonEmptyBody(putRequest,request);
return putRequest;
}
case Request.Method.HEAD:
return new HttpHead(request.getUrl());
case Request.Method.OPTIONS:
return new HttpOptions(request.getUrl());
case Request.Method.TRACE:
return new HttpTrace(request.getUrl());
case Request.Method.PATCH: {
HttpPatch patchRequest = new HttpPatch(request.getUrl());
patchRequest.addHeader(HEADER_CONTENT_TYPE,request.getBodyContentType());
setEntityIfNonEmptyBody(patchRequest,request);
return patchRequest;
}
default:
throw new IllegalStateException("Unknown request method.");
}
}
private static void setEntityIfNonEmptyBody(HttpEntityEnclosingRequestBase httpRequest,Request<?> request) throws AuthFailureError {
byte[] body = request.getBody();
if (body != null) {
HttpEntity entity = new ByteArrayEntity(body);
httpRequest.setEntity(entity);
}
}
private static class OwnHttpDelete extends HttpPost {
public static final String METHOD_NAME = "DELETE";
public OwnHttpDelete() {
super();
}
public OwnHttpDelete(URI uri) {
super(uri);
}
public OwnHttpDelete(String uri) {
super(uri);
}
public String getMethod() {
return METHOD_NAME;
}
}
}
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