3
我的项目是由Eclipse的GAE Plugin创建的（没有Maven），我想要发布我的代码：将文件从HTML表单通过Servlet上传到Google云端存储（使用Google云端存储客户端库for Java）
针对home.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>
UploadServlet.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();
}
}
}
我试图也设定上传的使用upload.setMaxSize（-1）的MAXIMUMSIZE;或将BUFFER_SIZE从2 * 1024 * 1024更改为200 * 1024 * 1024，但问题仍然存在。更具体地讲，当载达到100％，我收到此消息的网页：
Error: Request Entity Too Large Your client issued a request that was too large.
如何解决在使用JAVA和谷歌云存储客户端库的Java？ （我不打算改变与其他编程语言的项目）
你能帮我找到解决方案吗？非常感谢！
什么是文件的大小，你正在上传。你可以尝试一个小文件？ – alex
我尝试过所有类型的大小，它似乎只适用于小于32MB的文件。我想上传大于32MB的文件。 – Aerox
请求大小限制为32Mb。看到我的答案替代品。 – alex