package chuankou;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.InputStream;
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import java.net.URISyntaxException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.nio.file.StandardCopyOption;
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/**
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* 修复 jSerialComm 库加载问题
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*/
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public final class SerialPortNativeLoader {
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private static final String LIB_PROPERTY = "com.fazecast.jSerialComm.library.path";
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private static final String EXPECTED_DLL = "jSerialComm.dll";
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private static volatile boolean libraryConfigured = false;
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// 静态块：确保在任何 SerialPort 类加载之前运行
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static {
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ensureLibraryPresentEarly();
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}
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private SerialPortNativeLoader() {
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// utility class
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}
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/**
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* 早期初始化 - 在静态块中运行
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*/
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private static synchronized void ensureLibraryPresentEarly() {
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if (libraryConfigured) {
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return;
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}
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System.out.println("开始初始化 jSerialComm 本地库...");
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// 第一步：设置系统属性，阻止自动下载
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setCriticalSystemProperties();
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// 第二步：尝试从项目资源中提取 DLL
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try {
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extractNativeLibraryFromResources();
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libraryConfigured = true;
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System.out.println("jSerialComm 本地库初始化成功");
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} catch (Exception e) {
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System.err.println("从资源提取 DLL 失败: " + e.getMessage());
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// 尝试备用方案
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try {
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setupLibraryFromFileSystem();
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libraryConfigured = true;
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System.out.println("从文件系统加载 jSerialComm 成功");
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} catch (Exception ex) {
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System.err.println("所有加载方式都失败: " + ex.getMessage());
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// 最后尝试：允许 jSerialComm 使用默认方式
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allowDefaultBehavior();
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}
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}
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}
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/**
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* 设置关键系统属性（在类加载前必须设置）
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*/
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private static void setCriticalSystemProperties() {
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// 阻止自动下载和端口代理
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System.setProperty("com.fazecast.jSerialComm.port.agent", "disabled");
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System.setProperty("com.fazecast.jSerialComm.autoload", "false");
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System.setProperty("com.fazecast.jSerialComm.autoDispose", "false");
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// 禁用日志和调试
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System.setProperty("com.fazecast.jSerialComm.debug", "false");
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System.setProperty("com.fazecast.jSerialComm.log", "false");
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System.out.println("已设置 jSerialComm 系统属性");
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}
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/**
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* 从 JAR 资源中提取 DLL
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*/
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private static void extractNativeLibraryFromResources() throws Exception {
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// 确定目标路径
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String tempDir = System.getProperty("java.io.tmpdir");
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Path targetDir = Paths.get(tempDir, "jSerialComm", "2.10.4");
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// 如果目录不存在，创建它
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if (!Files.exists(targetDir)) {
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Files.createDirectories(targetDir);
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}
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Path dllPath = targetDir.resolve(EXPECTED_DLL);
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// 检查 DLL 是否已存在且可用
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if (Files.exists(dllPath)) {
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System.out.println("DLL 已存在于: " + dllPath);
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// 设置库路径
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System.setProperty(LIB_PROPERTY, targetDir.toString());
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return;
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}
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// 从类路径资源加载 DLL
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String resourcePath = "/native/windows/x86_64/" + EXPECTED_DLL;
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InputStream dllStream = SerialPortNativeLoader.class.getResourceAsStream(resourcePath);
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if (dllStream == null) {
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// 尝试其他可能的路径
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resourcePath = "/lib/native/windows/x86_64/" + EXPECTED_DLL;
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dllStream = SerialPortNativeLoader.class.getResourceAsStream(resourcePath);
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}
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if (dllStream == null) {
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// 尝试从文件系统加载
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resourcePath = "lib/native/windows/x86_64/" + EXPECTED_DLL;
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File file = new File(resourcePath);
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if (file.exists()) {
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dllStream = Files.newInputStream(file.toPath());
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}
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}
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if (dllStream == null) {
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throw new RuntimeException("无法在资源中找到 " + EXPECTED_DLL);
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}
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// 复制 DLL 到临时目录
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try (InputStream is = dllStream;
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FileOutputStream fos = new FileOutputStream(dllPath.toFile())) {
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byte[] buffer = new byte[8192];
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int bytesRead;
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while ((bytesRead = is.read(buffer)) != -1) {
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fos.write(buffer, 0, bytesRead);
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}
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}
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System.out.println("DLL 已提取到: " + dllPath);
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// 设置库路径
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System.setProperty(LIB_PROPERTY, targetDir.toString());
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System.setProperty("java.library.path",
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System.getProperty("java.library.path") + File.pathSeparator + targetDir.toString());
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}
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/**
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* 从文件系统设置库
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*/
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private static void setupLibraryFromFileSystem() throws Exception {
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// 检查多个可能的路径
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String[] possiblePaths = {
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"lib/native/windows/x86_64/" + EXPECTED_DLL,
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"./lib/native/windows/x86_64/" + EXPECTED_DLL,
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System.getProperty("user.dir") + "/lib/native/windows/x86_64/" + EXPECTED_DLL,
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"../lib/native/windows/x86_64/" + EXPECTED_DLL
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};
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for (String path : possiblePaths) {
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File dllFile = new File(path);
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if (dllFile.exists()) {
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System.out.println("找到 DLL: " + dllFile.getAbsolutePath());
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// 使用 DLL 所在目录
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File parentDir = dllFile.getParentFile();
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System.setProperty(LIB_PROPERTY, parentDir.getAbsolutePath());
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System.setProperty("java.library.path",
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System.getProperty("java.library.path") + File.pathSeparator + parentDir.getAbsolutePath());
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return;
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}
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}
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throw new RuntimeException("在文件系统中找不到 " + EXPECTED_DLL);
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}
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/**
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* 允许默认行为（最后的手段）
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*/
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private static void allowDefaultBehavior() {
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System.err.println("警告：使用 jSerialComm 的默认加载行为");
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// 清空阻止属性，让 jSerialComm 自己处理
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System.clearProperty("com.fazecast.jSerialComm.autoload");
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System.clearProperty("com.fazecast.jSerialComm.port.agent");
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}
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/**
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* 公共方法 - 供其他代码调用
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*/
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public static synchronized void ensureLibraryPresent() {
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// 静态块已经执行，这里只是确保
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if (!libraryConfigured) {
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ensureLibraryPresentEarly();
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}
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}
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}
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