将Java应用程序转换为jsp / servlet

Z时代
2024-01-10
分类：问答

我有一个接受分段上传的Java应用程序，我的问题是我希望对此具有HTML /

JSP前端，而不是仅在服务器上工作。根据我提供的代码，什么是实现此目的的最佳方法。这让我有些困惑，因为我不确定如何将文件上传部分带入html /

jsp页面。任何建议都会有所帮助。

非常感谢，语气

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import com.amazonaws.AmazonClientException;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.ClasspathPropertiesFileCredentialsProvider;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.ProgressEvent;
import com.amazonaws.services.s3.model.ProgressListener;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.transfer.TransferManager;
import com.amazonaws.services.s3.transfer.Upload;
public class S3TransferProgressSample {
private static AWSCredentials credentials;
private static TransferManager tx;
private static String bucketName;
private JProgressBar pb;
private JFrame frame;
private Upload upload;
private JButton button;
public static void main(String[] args) throws Exception {
    AmazonS3 s3 = new AmazonS3Client(credentials = new ClasspathPropertiesFileCredentialsProvider().getCredentials());
    Region usWest2 = Region.getRegion(Regions.US_WEST_2);
    s3.setRegion(usWest2);
    tx = new TransferManager(s3);
    bucketName = "s3-upload-sdk-sample-" + credentials.getAWSAccessKeyId().toLowerCase();
    new S3TransferProgressSample();
}
public S3TransferProgressSample() throws Exception {
    frame = new JFrame("Amazon S3 File Upload");
    button = new JButton("Choose File...");
    button.addActionListener(new ButtonListener());
    pb = new JProgressBar(0, 100);
    pb.setStringPainted(true);
    frame.setContentPane(createContentPane());
    frame.pack();
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
class ButtonListener implements ActionListener {
    public void actionPerformed(ActionEvent ae) {
        JFileChooser fileChooser = new JFileChooser();
        int showOpenDialog = fileChooser.showOpenDialog(frame);
        if (showOpenDialog != JFileChooser.APPROVE_OPTION) return;
        createAmazonS3Bucket();
        ProgressListener progressListener = new ProgressListener() {
            public void progressChanged(ProgressEvent progressEvent) {
                if (upload == null) return;
                pb.setValue((int)upload.getProgress().getPercentTransfered());
                switch (progressEvent.getEventCode()) {
                case ProgressEvent.COMPLETED_EVENT_CODE:
                    pb.setValue(100);
                    break;
                case ProgressEvent.FAILED_EVENT_CODE:
                    try {
                        AmazonClientException e = upload.waitForException();
                        JOptionPane.showMessageDialog(frame,
                                "Unable to upload file to Amazon S3: " + e.getMessage(),
                                "Error Uploading File", JOptionPane.ERROR_MESSAGE);
                    } catch (InterruptedException e) {}
                    break;
                }
            }
        };
        File fileToUpload = fileChooser.getSelectedFile();
        PutObjectRequest request = new PutObjectRequest(
                bucketName, fileToUpload.getName(), fileToUpload)
            .withProgressListener(progressListener);
        upload = tx.upload(request);
    }
}
private void createAmazonS3Bucket() {
    try {
        if (tx.getAmazonS3Client().doesBucketExist(bucketName) == false) {
            tx.getAmazonS3Client().createBucket(bucketName);
        }
    } catch (AmazonClientException ace) {
        JOptionPane.showMessageDialog(frame, "Unable to create a new Amazon S3 bucket: " + ace.getMessage(),
                "Error Creating Bucket", JOptionPane.ERROR_MESSAGE);
    }
}
private JPanel createContentPane() {
    JPanel panel = new JPanel();
    panel.add(button);
    panel.add(pb);
    JPanel borderPanel = new JPanel();
    borderPanel.setLayout(new BorderLayout());
    borderPanel.add(panel, BorderLayout.NORTH);
    borderPanel.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
    return borderPanel;
    }
}