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Copy pathJavaSwitcher.java
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253 lines (218 loc) · 9.13 KB
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import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.nio.file.*;
import java.util.*;
import java.util.List;
import java.util.stream.Collectors;
public class JavaSwitcher {
private List<JavaVersion> versions;
private JPanel listPanel;
private ButtonGroup group;
private JLabel statusLabel;
private record JavaVersion(String name, String home, String version, boolean isCurrent) {}
private static final String[] SCAN_DIRS = {
System.getProperty("user.home") + "/.sdkman/candidates/java",
"/usr/lib/jvm",
"/usr/lib/jdk",
"/usr/java",
"/opt/java",
"/opt/jdk"
};
public JavaSwitcher() {
versions = scan();
buildUI();
}
private List<JavaVersion> scan() {
List<JavaVersion> list = new ArrayList<>();
String currentHome = resolveCurrent();
for (String dir : SCAN_DIRS) {
File d = new File(dir);
if (!d.isDirectory()) continue;
File[] subs = d.listFiles(File::isDirectory);
if (subs == null) continue;
for (File sub : subs) {
File binJava = new File(sub, "bin/java");
if (!binJava.canExecute()) continue;
String ver = readVersion(binJava);
String name = sub.getName();
boolean cur = sub.getAbsolutePath().equals(currentHome);
list.add(new JavaVersion(name, sub.getAbsolutePath(), ver, cur));
}
}
list.sort(Comparator.comparing(JavaVersion::isCurrent).reversed()
.thenComparing(JavaVersion::name));
return list;
}
private String resolveCurrent() {
String home = System.getenv("JAVA_HOME");
if (home != null && new File(home).isDirectory()) return new File(home).getAbsolutePath();
File sdkmanCur = new File(System.getProperty("user.home"), ".sdkman/candidates/java/current");
if (sdkmanCur.isDirectory()) return sdkmanCur.getAbsolutePath();
String path = System.getenv("PATH");
if (path != null) {
for (String p : path.split(File.pathSeparator)) {
File j = new File(p, "java");
if (j.canExecute()) {
return j.getParentFile().getParentFile().getAbsolutePath();
}
}
}
return System.getProperty("java.home");
}
private String readVersion(File javaBin) {
try {
Process p = new ProcessBuilder(javaBin.getAbsolutePath(), "-version")
.redirectErrorStream(true).start();
String out = new String(p.getInputStream().readAllBytes());
p.waitFor();
return out.lines().findFirst().orElse("unknown");
} catch (Exception e) {
return "error: " + e.getMessage();
}
}
private void buildUI() {
JFrame f = new JFrame("Java 版本切换器");
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f.setLayout(new BorderLayout(10, 10));
f.setMinimumSize(new Dimension(520, 300));
JLabel title = new JLabel("选择 Java 版本");
title.setFont(new Font(Font.SANS_SERIF, Font.BOLD, 16));
title.setBorder(BorderFactory.createEmptyBorder(12, 16, 0, 16));
f.add(title, BorderLayout.NORTH);
listPanel = new JPanel();
listPanel.setLayout(new BoxLayout(listPanel, BoxLayout.Y_AXIS));
listPanel.setBorder(BorderFactory.createEmptyBorder(8, 16, 8, 16));
group = new ButtonGroup();
if (versions.isEmpty()) {
listPanel.add(new JLabel("未扫描到 Java 版本"));
} else {
for (JavaVersion v : versions) {
listPanel.add(createRow(v));
}
}
JScrollPane sp = new JScrollPane(listPanel);
sp.setBorder(null);
f.add(sp, BorderLayout.CENTER);
JPanel bottom = new JPanel(new BorderLayout());
bottom.setBorder(BorderFactory.createEmptyBorder(8, 16, 12, 16));
statusLabel = new JLabel(" ");
statusLabel.setForeground(Color.GRAY);
bottom.add(statusLabel, BorderLayout.WEST);
JPanel btns = new JPanel(new FlowLayout(FlowLayout.RIGHT, 8, 0));
JButton cancel = new JButton("取消");
cancel.addActionListener(e -> f.dispose());
JButton apply = new JButton("应用");
apply.addActionListener(e -> applySelection(f));
btns.add(cancel);
btns.add(apply);
bottom.add(btns, BorderLayout.EAST);
f.add(bottom, BorderLayout.SOUTH);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
private JPanel createRow(JavaVersion v) {
JPanel row = new JPanel(new BorderLayout(8, 0));
row.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createMatteBorder(0, 0, 1, 0, new Color(230, 230, 230)),
BorderFactory.createEmptyBorder(6, 4, 6, 4)));
row.setMaximumSize(new Dimension(Integer.MAX_VALUE, 44));
JRadioButton rb = new JRadioButton(v.name);
rb.setSelected(v.isCurrent);
rb.addActionListener(e -> updatePreview(v));
group.add(rb);
JLabel verLabel = new JLabel(v.version);
verLabel.setForeground(Color.GRAY);
verLabel.setFont(new Font(Font.MONOSPACED, Font.PLAIN, 11));
JLabel curTag = new JLabel(v.isCurrent ? "● 当前" : "");
curTag.setForeground(new Color(46, 125, 50));
curTag.setFont(new Font(Font.SANS_SERIF, Font.PLAIN, 11));
JPanel right = new JPanel(new FlowLayout(FlowLayout.RIGHT, 12, 0));
right.add(verLabel);
right.add(curTag);
row.add(rb, BorderLayout.WEST);
row.add(right, BorderLayout.EAST);
return row;
}
private JavaVersion selected() {
for (JavaVersion v : versions) {
if (v.isCurrent) return v;
}
return versions.isEmpty() ? null : versions.get(0);
}
private void updatePreview(JavaVersion v) {
statusLabel.setText("选中: " + v.home + " (" + v.version + ")");
}
private void applySelection(JFrame frame) {
JavaVersion sel = findSelected();
if (sel == null) {
JOptionPane.showMessageDialog(frame, "请选择一个版本", "提示", JOptionPane.WARNING_MESSAGE);
return;
}
if (sel.isCurrent) {
statusLabel.setText("已是当前版本,无需切换");
return;
}
try {
int r = JOptionPane.showConfirmDialog(frame,
"将 Java 切换为:\n" + sel.name + " (" + sel.version + ")\n路径: " + sel.home,
"确认切换", JOptionPane.OK_CANCEL_OPTION);
if (r != JOptionPane.OK_OPTION) return;
applyToProfile(sel.home);
linkSdkman(sel.home);
statusLabel.setText("已切换,新终端生效");
JOptionPane.showMessageDialog(frame, "切换完成!\n请重新打开终端以生效。", "完成", JOptionPane.INFORMATION_MESSAGE);
frame.dispose();
} catch (Exception e) {
JOptionPane.showMessageDialog(frame, "切换失败: " + e.getMessage(), "错误", JOptionPane.ERROR_MESSAGE);
}
}
private JavaVersion findSelected() {
Enumeration<AbstractButton> en = group.getElements();
int i = 0;
while (en.hasMoreElements()) {
if (en.nextElement().isSelected() && i < versions.size()) {
return versions.get(i);
}
i++;
}
return null;
}
private void applyToProfile(String javaHome) throws Exception {
File profile = new File(System.getProperty("user.home"), ".profile");
String content = Files.readString(profile.toPath());
String marker = "export JAVA_HOME=";
String newLine = marker + "\"" + javaHome + "\"";
if (content.contains(marker)) {
content = content.replaceAll("(?m)^export JAVA_HOME=.*$", newLine);
} else {
if (content.contains("_JAVA_OPTIONS")) {
content = content.replaceAll("(_JAVA_OPTIONS[^\n]*\n)", "$1" + newLine + "\n");
} else {
content += "\n" + newLine + "\n";
}
}
Files.writeString(profile.toPath(), content);
}
private void linkSdkman(String javaHome) {
File sdkman = new File(System.getProperty("user.home"), ".sdkman/bin/sdkman-init.sh");
if (!sdkman.exists()) return;
Path javaPath = Path.of(javaHome);
Path candidates = Path.of(System.getProperty("user.home"), ".sdkman/candidates/java");
if (javaPath.startsWith(candidates)) {
try {
Path current = candidates.resolve("current");
Files.deleteIfExists(current);
Files.createSymbolicLink(current, javaPath);
} catch (Exception ignored) {}
}
}
public static void main(String[] args) {
System.setProperty("awt.useSystemAAFontSettings", "on");
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception ignored) {}
SwingUtilities.invokeLater(JavaSwitcher::new);
}
}
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