Skip to content
Navigation Menu
{{ message }}
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathJavaSwitcher.java
More file actions
253 lines (218 loc) · 9.13 KB
/
Copy pathJavaSwitcher.java
File metadata and controls
253 lines (218 loc) · 9.13 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
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);
}
}
You can’t perform that action at this time.