我正在将图像数组发送到REST API，该API在数字化后返回表单字段。我的应用程序具有最低API级别21。我正在使用Android Volley向REST API发送数据或从REST API接收数据。
该代码可完美地用于单个图像，但是当发送多个图像时，该代码将失败。这里有一些答案建议清除队列中的缓存，但是它已经存在于代码中，并不能解决问题。
此外，后端代码也没有问题，因为它在Postman中工作正常，但响应在Android中失败。现在，我正在棉花糖上尝试。它很少起作用。该API似乎不是问题。
JSON请求：
{
"imageFormat": "jpeg",
"formType": "dummyForm",
"images":
[
"//base64 of image1",
"//base64 of image2", //as many as required
]
}
JSON响应：
{
"dummyLines": // Response from all images' form fields is in this array
[
{
"confidence": "high",
"key": "FIRST NAME :",
"value": "ABC"
},
...
// The above set is repeated for all form fields
],
"dummyStatus": "Succeeded",
"message": "none"
}
这些是处理请求和响应的类：
DummyRequest类
public class DummyRequest
{
String imageFormat;
String formType;
String images[];
}
DummyImageResponse类
public class DummyImageResponse implements Serializable
{
ArrayList<FieldsJson> dummyLines = new ArrayList<>();
String dummyStatus;
}
FieldsJson类
public class FieldsJson implements Serializable
{
String key;
String value;
String confidence;
}
此代码将Bitmap图像编码为Base64：
for(int i=0; i<cameraImageAdapter.getCount(); i++)
{
Bitmap bitmap = BitmapFactory.decodeFile(capturedImagePathList.get(i));
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream);
byte[] imageByteArray = byteArrayOutputStream.toByteArray();
cameraEncodedImages[i] = Base64.encodeToString(imageByteArray, Base64.DEFAULT);
}
我在onErrorResponse方法中包含了一些其他代码，并且获得了以下堆栈跟踪。 这是调用API的代码：
ResponseHandler responseHandler = new ResponseHandler(
API_URL,
DummyImageResponse.class,
request,
new HashMap<String, String>(),
new Response.Listener<DummyImageResponse>() {
@Override
public void onResponse(DummyImageResponse response) {
Log.e("Success response", response.toString());
// Call new activity to display the result
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("Error response", error.toString());
NetworkResponse errorResponse = error.networkResponse;
if(error instanceof ServerError && errorResponse != null)
{
try {
Log.e("In error response", "Response not null");
String response = new String(errorResponse.data,
HttpHeaderParser.parseCharset(errorResponse.headers, "UTF-8"));
Log.e("Parsed response", response);
}
catch (UnsupportedEncodingException e)
{
Log.e("In error response", e.getMessage());
}
}
else
Log.e("In error response", "Response is null");
// Call new activity to display error message
}
}
);
RequestQueue queue = Volley.newRequestQueue(context);
responseHandler.setRetryPolicy(new DefaultRetryPolicy(
50000,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
queue.getCache().clear(); // Clear the queue
queue.add(responseHandler); // Request is sent to the REST API
预期输出必须包含表单中的所有字段。但是，当涉及多个图像时，JSON响应很可能由于某种原因而损坏，并且由于某些ServerError库解析JSON而可能会生成glassfish，我读到了。我不确定。
可能是因为Android和Postman处理JSON数据略有不同。
这是我得到的确切错误消息：
E/Volley: [18942] BasicNetwork.performRequest: Unexpected response code 500 for **URL goes here**
E/Error response: com.android.volley.ServerError
E/In error response: Response not null
E/Parsed response: <!doctype html><html lang="en"><head><title>HTTP Status 500 – Internal Server Error</title><style type="text/css">h1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} h2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} h3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} body {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} p {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;} a {color:black;} a.name {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP Status 500 – Internal Server Error</h1><hr class="line" /><p><b>Type</b> Exception Report</p><p><b>Message</b> java.lang.StringIndexOutOfBoundsException: String index out of range: -2</p><p><b>Description</b> The server encountered an unexpected condition that prevented it from fulfilling the request.</p><p><b>Exception</b></p><pre>javax.servlet.ServletException: java.lang.StringIndexOutOfBoundsException: String index out of range: -2
org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:408)
org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346)
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:365)
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:318)
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
</pre><p><b>Root Cause</b></p><pre>java.lang.StringIndexOutOfBoundsException: String index out of range: -2
java.lang.String.substring(String.java:1967)
com.example.ICRAPI.GetGender.main(GetGender.java:21)
com.example.ICRAPI.dummyForm.main(dummyForm.java:178)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52)
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:124)
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:167)
org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:219)
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:79)
org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:469)
org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:391)
org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:80)
org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:253)
org.glassfish.jersey.internal.Errors$1.call(Errors.java:248)
org.glassfish.jersey.internal.Errors$1.call(Errors.java:244)
org.glassfish.jersey.internal.Errors.process(Errors.java:292)
org.glassfish.jersey.internal.Errors.process(Errors.java:274)
org.glassfish.jersey.internal.Errors.process(Errors.java:244)
org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265)
org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:232)
org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:679)
org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:392)
org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346)
org.glassfish.jersey.servlet.ServletConta