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[英]No Response on Google App Engine Java Blobstore Upload from Android
[英]Google App Engine & Java : upload files into the blobstore
我想知道是否可以在不使用servlet的情況下將文件上傳到gae blobstore中,一旦插入完成,是否還可以獲得插入的blobkey? 這是我到目前為止完成的代碼:
public Upload(Blob picture) {
HTTPResponse fetch = null;
try {
BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
URLFetchService urlfetch = URLFetchServiceFactory.getURLFetchService();
String uploadUrl = blobstoreService.createUploadUrl("/upload");
URL url = new URL(uploadUrl);
HTTPRequest request = new HTTPRequest(url, HTTPMethod.POST);
request.setPayload(picture.getBytes());
try {
urlfetch.fetch(request);
} catch (IOException ex) {
java.util.logging.Logger.getLogger(Outfit.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (MalformedURLException ex) {
java.util.logging.Logger.getLogger(Outfit.class.getName()).log(Level.SEVERE, null, ex);
}
}
如果不使用servlet,就無法在某個時刻將文件上傳到blobstore。
我想如果您願意,可以使用Blobstore的新實驗性寫入api。
GAE文檔中的上載示例非常簡單,建議您堅持使用。 看看Blobstore Java API概述 。 鏈接中有一個示例。
使用Servlet更好,我將共享代碼以完美地進行攀爬,並且BlobKey必須捕獲並存儲在數據存儲區中
.JSP
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="java.util.*" %>
<%@ page import="com.google.appengine.api.blobstore.BlobstoreServiceFactory" %>
<%@ page import="com.google.appengine.api.blobstore.BlobstoreService" %>
<%
BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
String url = blobstoreService.createUploadUrl("/upload");
%>
<!DOCTYPE html>
<html lang="en">
<body>
<div class="form-group">
<label for="inputEmail1" class="col-lg-2 control-label">Foto</label>
<div class="col-lg-10">
<input id="file-foto-usuario" type="file" name="file-foto-usuario" onchange="UploadImage()">
<input type="hidden" class="form-control" id="foto-usuario" placeholder="Foto">
</div>
</div>
</body>
.js文件
function UploadImage(){
var inputFileImage = document.getElementById("file-foto-usuario");
var file = inputFileImage.files[0];
var data = new FormData();
data.append("file-foto-usuario",file);
var url = "<%=url%>";
$.ajax({
url: url,
type: 'POST',
cache : false,
data : data,
processData : false,
contentType : false,
dataType: "json",
success: function (response) {
if(response.success){
alert(response.blobKey);
}else{
alert("fail");
}
}
});
}
Upload.java
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.simple.JSONObject;
import com.google.appengine.api.blobstore.BlobKey;
import com.google.appengine.api.blobstore.BlobstoreService;
import com.google.appengine.api.blobstore.BlobstoreServiceFactory;
public class UploadServlet extends HttpServlet {
private BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
JSONObject finalJson = new JSONObject();
Boolean success= false;
String blobid= "";
Map<String, BlobKey> blobs = blobstoreService.getUploadedBlobs(req);
BlobKey blobKey = blobs.get("file-foto-usuario");
if (blobKey == null) {
resp.sendRedirect("/");
} else {
success= true;
blobid= blobKey.getKeyString();
//resp.sendRedirect("/serve?blob-key=" + blobKey.getKeyString());
}
finalJson.put("success", success);
finalJson.put("blobKey", blobid);
resp.setCharacterEncoding("utf8");
resp.setContentType("application/json");
PrintWriter out = resp.getWriter();
out.print(finalJson);
}
}
獲取網址圖片
String urlFoto = "";
BlobKey blobKey = new BlobKey(Blobkey);
ImagesService imagesService = ImagesServiceFactory.getImagesService();
try{
urlFoto = imagesService.getServingUrl(blobKey, true);
}catch (IllegalArgumentException ie){
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