最近我在学习Java编程 |21xrx.com

最近我在学习Java编程

2023-06-11 02:43:55 深夜i -- --

上传文件编辑文件和Java程序

最近我在学习Java编程，今天想分享一下我如何使用Java实现上传文件并能够编辑的方法。在这个过程中，我用到了三个

首先，我用Java编写了一个简单的文件上传程序。这个程序能够从用户的电脑中选取一个文件，然后将其上传到服务器上。以下是我的代码示例：


import java.io.*;
import java.net.*;
public class FileUploader {
  private static final int BUFFER_SIZE = 4096;
  public static void uploadFile(String filepath, String uploadUrl) throws IOException {
    File uploadFile = new File(filepath);
    HttpURLConnection httpConnection = (HttpURLConnection) new URL(uploadUrl).openConnection();
    httpConnection.setDoOutput(true);
    httpConnection.setRequestMethod("POST");
    httpConnection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + "===");
    OutputStream outputStream = httpConnection.getOutputStream();
    PrintWriter writer = new PrintWriter(new OutputStreamWriter(outputStream, "UTF-8"), true);
    writer.append("--===").append("\r\n");
    writer.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + uploadFile.getName() + "\"").append("\r\n");
    writer.append("Content-Type: " + URLConnection.guessContentTypeFromName(uploadFile.getName())).append("\r\n");
    writer.append("Content-Transfer-Encoding: binary").append("\r\n");
    writer.append("\r\n");
    writer.flush();
    try (FileInputStream inputStream = new FileInputStream(uploadFile)) {
      byte[] buffer = new byte[BUFFER_SIZE];
      int bytesRead;
      while ((bytesRead = inputStream.read(buffer)) != -1) {
        outputStream.write(buffer, 0, bytesRead);
      }
      outputStream.flush();
    }
    writer.append("\r\n");
    writer.flush();
    writer.append("--===");
    writer.flush();
    int responseCode = httpConnection.getResponseCode();
    String responseMessage = httpConnection.getResponseMessage();
    System.out.println("Response status code: " + responseCode);
    System.out.println("Response message: " + responseMessage);
  }
}

接下来，我又写了一个简单的文件编辑程序。这个程序能够从服务器上读取一个文件，然后将其保存到用户的电脑上。用户可编辑这个文件并重新上传回服务器。以下是我的代码示例：


import java.io.*;
import java.net.*;
public class FileEditor {
  private static final int BUFFER_SIZE = 4096;
  public static void editFile(String fileUrl, String downloadFolder) throws IOException {
    HttpURLConnection httpConnection = (HttpURLConnection) new URL(fileUrl).openConnection();
    int responseCode = httpConnection.getResponseCode();
    if (responseCode == HttpURLConnection.HTTP_OK) {
      String disposition = httpConnection.getHeaderField("Content-Disposition");
      String contentType = httpConnection.getContentType();
      int contentLength = httpConnection.getContentLength();
      InputStream inputStream = httpConnection.getInputStream();
      String filename = disposition.substring(disposition.indexOf("filename=") + 10, disposition.length() - 1);
      String saveFilePath = downloadFolder + File.separator + filename;
      FileOutputStream outputStream = new FileOutputStream(saveFilePath);
      int bytesRead;
      byte[] buffer = new byte[BUFFER_SIZE];
      while ((bytesRead = inputStream.read(buffer)) != -1) {
        outputStream.write(buffer, 0, bytesRead);
      }
      outputStream.close();
      inputStream.close();
      // Open the file for editing
      Desktop.getDesktop().edit(new File(saveFilePath));
      // Upload the edited file
      FileUploader.uploadFile(saveFilePath, fileUrl);
    } else {
      System.out.println("No file found on server.");
    }
  }
}

最后，我将这两个程序组合在一起，实现了文件上传并能够编辑的功能。我命名为“Java实现上传文件且能编辑”的项目。在这个项目中，我编写了一个简单的用户界面，让用户选择需要上传的文件，然后上传并编辑它。以下是我的代码示例：


import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
public class FileUploaderEditorGUI {
  private JFrame frame;
  private JTextField textFieldFilePath;
  private JTextField textFieldFileUrl;
  private JButton btnChooseFile;
  private JButton btnUpload;
  private JButton btnEdit;
  private JPanel panel;
  public FileUploaderEditorGUI() {
    frame = new JFrame("Java实现上传文件且能编辑");
    frame.setSize(600, 350);
    frame.setResizable(false);
    frame.setLocationRelativeTo(null);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    panel = new JPanel();
    GridBagLayout layout = new GridBagLayout();
    panel.setLayout(layout);
    GridBagConstraints constraints = new GridBagConstraints();
    constraints.fill = GridBagConstraints.HORIZONTAL;
    constraints.insets = new Insets(5, 5, 5, 5);
    JLabel labelFilePath = new JLabel("文件路径：");
    constraints.gridx = 0;
    constraints.gridy = 0;
    panel.add(labelFilePath, constraints);
    textFieldFilePath = new JTextField();
    textFieldFilePath.setEditable(false);
    constraints.gridx = 1;
    constraints.weightx = 1.0;
    panel.add(textFieldFilePath, constraints);
    btnChooseFile = new JButton("选择文件");
    btnChooseFile.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        JFileChooser fileChooser = new JFileChooser();
        int returnValue = fileChooser.showOpenDialog(null);
        if (returnValue == JFileChooser.APPROVE_OPTION) {
          textFieldFilePath.setText(fileChooser.getSelectedFile().getPath());
        }
      }
    });
    constraints.gridx = 2;
    constraints.weightx = 0;
    panel.add(btnChooseFile, constraints);
    JLabel labelFileUrl = new JLabel("文件URL：");
    constraints.gridx = 0;
    constraints.gridy = 1;
    panel.add(labelFileUrl, constraints);
    textFieldFileUrl = new JTextField();
    constraints.gridx = 1;
    constraints.gridy = 1;
    constraints.gridwidth = 2;
    constraints.weightx = 1.0;
    panel.add(textFieldFileUrl, constraints);
    btnUpload = new JButton("上传文件");
    btnUpload.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        try {
          FileUploader.uploadFile(textFieldFilePath.getText(), textFieldFileUrl.getText());
        } catch (IOException ex) {
          ex.printStackTrace();
        }
      }
    });
    constraints.gridx = 0;
    constraints.gridy = 2;
    constraints.gridwidth = 2;
    constraints.weightx = 1.0;
    panel.add(btnUpload, constraints);
    btnEdit = new JButton("编辑文件");
    btnEdit.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        try {
          FileEditor.editFile(textFieldFileUrl.getText(), System.getProperty("user.home"));
        } catch (IOException ex) {
          ex.printStackTrace();
        }
      }
    });
    constraints.gridx = 2;
    constraints.gridy = 2;
    constraints.gridwidth = 1;
    constraints.weightx = 0;
    panel.add(btnEdit, constraints);
    frame.getContentPane().add(panel);
    frame.setVisible(true);
  }
  public static void main(String[] args) {
    new FileUploaderEditorGUI();
  }
}

我成功地用Java实现了上传文件并能够编辑的功能，这给我带来了很多的乐趣和挑战。我相信这个过程也会对Java编程的学习者们有所启发。

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