我正在尝试实现一个工资单生成器。我已经让 GUI 在单独的 JPanel 上生成工资单。当我单击“另存为 PNG”按钮时，它当前将 Jpanel 保存为项目文件夹内的 png 文件。但我希望它在保存时能够指定文件路径和文件名。这是我到目前为止所做的事情。
public static BufferedImage getScreenShot(Component component) {
BufferedImage image = new BufferedImage(component.getWidth(), component.getHeight(), BufferedImage.TYPE_INT_RGB);
component.paint(image.getGraphics());
return image;
}
public void saveScreenShot(Component component, String fname) throws Exception {
BufferedImage img = getScreenShot(component);
ImageIO.write(img, "png", new File(fname));
}
private void SaveAsPNGButtonActionPerformed(java.awt.event.ActionEvent evt) {
try {
saveScreenShot(PaySlip, "My panel Image.png");
} catch (Exception e) {
}
}
我希望它类似于下面的代码。我用它来将 Jtable 中的搜索结果保存到文本文件中。
private void Export2TextActionPerformed(java.awt.event.ActionEvent evt) {
try {
JFileChooser fc = new JFileChooser();
int option = fc.showSaveDialog(SearchEmployeeGUI.this);
if (option == JFileChooser.APPROVE_OPTION) {
try {
String filename = fc.getSelectedFile().getName();
String path = fc.getSelectedFile().getParentFile().getPath();
int len = filename.length();
String ext = "";
String file = "";
if (len > 4) {
ext = filename.substring(len - 4, len);
}
if (ext.equals(".txt")) {
file = path + "\\" + filename;
} else {
file = path + "\\" + filename + ".txt";
}
FileWriter fw = new FileWriter(file);
BufferedWriter bw = new BufferedWriter(fw);
bw.write("Employee ID First Name Last Name Gender Contact No Email Date of Join Designation Basic Salary");
bw.newLine();
bw.write("--------------------------------------------------------------------------------------------------------------------------------------------");
bw.newLine();
for (int i = 0; i < EmployeeTable.getRowCount(); i++) {
for (int j = 0; j < EmployeeTable.getColumnCount(); j++) {
bw.write(EmployeeTable.getModel().getValueAt(i, j) + " ");
}
bw.newLine();
}
bw.close();
fw.close();
int answer = JOptionPane.showConfirmDialog(null, "Would you like to open the exported file?", "Successfully exported!", option);
if (answer == JOptionPane.YES_OPTION) {
try {
Desktop dt = Desktop.getDesktop();
dt.open(new File(file));
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
在这里我可以指定路径和文件名。我想要同样的“另存为png”按钮。但我不知道该怎么做。有人可以帮忙吗？提前致谢。
最佳答案
您可以使用JFileChooser
String suggesteddir = ".";
String EXTENSION = ".png";
JFileChooser fileChooser = new JFileChooser(suggesteddir);
JFrame choose = new JFrame();
choose.setTitle("Save To ...");
int status = fileChooser.showSaveDialog(choose);
if (status == JFileChooser.APPROVE_OPTION)
{
try
{
File selectedFile = fileChooser.getSelectedFile();
String newfile = selectedFile.getCanonicalPath();
if (!newfile.endsWith(EXTENSION)) {
newfile=newfile + EXTENSION;
}
ImageIO.write(img, "png", new File(newfile)); //write img to file
} catch (IOException ex) {
ex.printStackTrace();
}
}
关于java - 将 JPanel 保存为 png 文件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30832866/