我的项目是由 GAE Plugin for Eclipse(没有 Maven)创建的，我将发布我的代码:
首页.jsp
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Upload Test</title>
</head>
<body>
<form action="/upload" method="post" name="putFile" id="putFile"
enctype="multipart/form-data">
<input type="file" name="myFile" id="fileName">
<input type="submit" value="Upload">
</form>
</body>
</html>
上传Servlet.java:
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.nio.channels.Channels;
import java.util.Enumeration;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import com.google.appengine.tools.cloudstorage.GcsFileOptions;
import com.google.appengine.tools.cloudstorage.GcsFilename;
import com.google.appengine.tools.cloudstorage.GcsOutputChannel;
import com.google.appengine.tools.cloudstorage.GcsService;
import com.google.appengine.tools.cloudstorage.GcsServiceFactory;
import com.google.appengine.tools.cloudstorage.RetryParams;
public class UploadServlet extends HttpServlet {
private static final Logger log = Logger.getLogger(UploadServlet.class.getName());
private final GcsService gcsService = GcsServiceFactory.createGcsService(new RetryParams.Builder()
.initialRetryDelayMillis(10)
.retryMaxAttempts(10)
.totalRetryPeriodMillis(15000)
.build());
private String bucketName = "myBucketNameOnGoogleCloudStorage";
/**Used below to determine the size of chucks to read in. Should be > 1kb and < 10MB */
private static final int BUFFER_SIZE = 2 * 1024 * 1024;
@SuppressWarnings("unchecked")
@Override
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
String sctype = null, sfieldname, sname = null;
ServletFileUpload upload;
FileItemIterator iterator;
FileItemStream item;
InputStream stream = null;
try {
upload = new ServletFileUpload();
res.setContentType("text/plain");
iterator = upload.getItemIterator(req);
while (iterator.hasNext()) {
item = iterator.next();
stream = item.openStream();
if (item.isFormField()) {
log.warning("Got a form field: " + item.getFieldName());
} else {
log.warning("Got an uploaded file: " + item.getFieldName() +
", name = " + item.getName());
sfieldname = item.getFieldName();
sname = item.getName();
sctype = item.getContentType();
GcsFilename gcsfileName = new GcsFilename(bucketName, sname);
GcsFileOptions options = new GcsFileOptions.Builder()
.acl("public-read").mimeType(sctype).build();
GcsOutputChannel outputChannel =
gcsService.createOrReplace(gcsfileName, options);
copy(stream, Channels.newOutputStream(outputChannel));
res.sendRedirect("/");
}
}
} catch (Exception ex) {
throw new ServletException(ex);
}
}
private void copy(InputStream input, OutputStream output) throws IOException {
try {
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead = input.read(buffer);
while (bytesRead != -1) {
output.write(buffer, 0, bytesRead);
bytesRead = input.read(buffer);
}
} finally {
input.close();
output.close();
}
}
}
我还尝试使用 upload.setMaxSize(-1) 设置上传的最大尺寸；或将 BUFFER_SIZE 从 2*1024*1024 更改为 200*1024*1024，但问题仍然存在。更具体地说，当上传达到 100% 时，我在网页上收到此消息:
Error: Request Entity Too Large Your client issued a request that was too large.
我如何使用 JAVA 和适用于 Java 的 Google 云存储客户端库解决这个问题？ (我不会用其他编程语言彻底改变项目)
你能帮我找到一个解决方案吗？非常感谢!
最佳答案
App Engine 请求限制为 32Mb。这就是当您发送大于 32Mb 的文件时上传失败的原因。 Checkout Quotas and Limits section .
上传文件 > 32Mb 有两种选择:
Blobstore API . 您可以指定 GCS 存储桶而不是使用 Blobstore 存储空间。
要做到这一点，请使用
BlobstoreService的createUploadUrl(java.lang.String successPath, UploadOptions uploadOptions)方法。这是一个示例应用程序:https://github.com/crhym3/java-blobstore-gcs-sample
或者您可以只使用 Google Drive 并在数据存储中仅存储文档 ID :)
关于java - 通过 Servlet 将文件从 HTML 表单上传到 Google Cloud Storage(使用 Google Cloud Storage Client Library for Java)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23144082/