java.net.URLClassLoader.<init>()方法的使用及代码示例

x33g5p2x  于2022-01-31 转载在 其他  
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本文整理了Java中java.net.URLClassLoader.<init>()方法的一些代码示例，展示了URLClassLoader.<init>()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。URLClassLoader.<init>()方法的具体详情如下：
包路径：java.net.URLClassLoader
类名称：URLClassLoader
方法名：<init>

URLClassLoader.<init>介绍

[英]Constructs a new URLClassLoader instance. The newly created instance will have the system ClassLoader as its parent. URLs that end with "/" are assumed to be directories, otherwise they are assumed to be JAR files.
[中]构造一个新的URLClassLoader实例。新创建的实例将把系统类加载器作为其父类。以“/”结尾的URL被假定为目录，否则它们被假定为JAR文件。

代码示例

代码示例来源：origin: joelittlejohn/jsonschema2pojo

@Override
  public ClassLoader run() {
    return new URLClassLoader(classpathUrls.toArray(new URL[classpathUrls.size()]), parent);
  }
});

代码示例来源：origin: stackoverflow.com

URL[] url={new URL("file://foo")};
URLClassLoader loader = new URLClassLoader(url);

代码示例来源：origin: eclipse-vertx/vert.x

/**
 * Creates a classloader respecting the classpath option.
 *
 * @return the classloader.
 */
protected synchronized ClassLoader createClassloader() {
 URL[] urls = classpath.stream().map(path -> {
  File file = new File(path);
  try {
   return file.toURI().toURL();
  } catch (MalformedURLException e) {
   throw new IllegalStateException(e);
  }
 }).toArray(URL[]::new);
 return new URLClassLoader(urls, this.getClass().getClassLoader());
}

代码示例来源：origin: btraceio/btrace

public CompilerClassWriter(String classPath, PrintWriter perr) {
  super(ClassWriter.COMPUTE_FRAMES);
  List<URL> urls = new ArrayList<>();
  for(String e : classPath.split(File.pathSeparator)) {
    File f = new File(e);
    try {
      urls.add(f.toURI().toURL());
    } catch (MalformedURLException ex) {
      perr.printf("%s is not a valid classpath entry\n", e);
    }
  }
  cl = new URLClassLoader(urls.toArray(new URL[urls.size()]), getClass().getClassLoader());
}

代码示例来源：origin: apache/hive

/**
 * Add new elements to the classpath.
 *
 * @param newPaths
 *          Array of classpath elements
 */
public static ClassLoader addToClassPath(ClassLoader cloader, String[] newPaths) throws Exception {
 URLClassLoader loader = (URLClassLoader) cloader;
 List<URL> curPath = Arrays.asList(loader.getURLs());
 ArrayList<URL> newPath = new ArrayList<>(curPath.size());
 // get a list with the current classpath components
 for (URL onePath : curPath) {
  newPath.add(onePath);
 }
 curPath = newPath;
 for (String onestr : newPaths) {
  URL oneurl = urlFromPathString(onestr);
  if (oneurl != null && !curPath.contains(oneurl)) {
   curPath.add(oneurl);
  }
 }
 return new URLClassLoader(curPath.toArray(new URL[0]), loader);
}

代码示例来源：origin: spring-projects/spring-framework

/**
 * Create a parent ClassLoader for Groovy to use as parent ClassLoader
 * when loading and compiling templates.
 */
protected ClassLoader createTemplateClassLoader() throws IOException {
  String[] paths = StringUtils.commaDelimitedListToStringArray(getResourceLoaderPath());
  List<URL> urls = new ArrayList<>();
  for (String path : paths) {
    Resource[] resources = getApplicationContext().getResources(path);
    if (resources.length > 0) {
      for (Resource resource : resources) {
        if (resource.exists()) {
          urls.add(resource.getURL());
        }
      }
    }
  }
  ClassLoader classLoader = getApplicationContext().getClassLoader();
  Assert.state(classLoader != null, "No ClassLoader");
  return (!urls.isEmpty() ? new URLClassLoader(urls.toArray(new URL[0]), classLoader) : classLoader);
}

代码示例来源：origin: apache/avro

protected URLClassLoader createClassLoader() throws DependencyResolutionRequiredException, MalformedURLException {
 List<URL> urls = appendElements(project.getRuntimeClasspathElements());
 urls.addAll(appendElements(project.getTestClasspathElements()));
 return new URLClassLoader(urls.toArray(new URL[urls.size()]),
     Thread.currentThread().getContextClassLoader());
}

代码示例来源：origin: google/guava

@AndroidIncompatible // Android forbids null parent ClassLoader
public void testClassPathEntries_notURLClassLoader_withParentAndGrandParent() throws Exception {
 URL url1 = new URL("file:/a");
 URL url2 = new URL("file:/b");
 URLClassLoader grandParent = new URLClassLoader(new URL[] {url1}, null);
 URLClassLoader parent = new URLClassLoader(new URL[] {url2}, grandParent);
 assertThat(ClassPath.Scanner.getClassPathEntries(new ClassLoader(parent) {}))
   .containsExactly(new File("/a"), grandParent, new File("/b"), parent);
}

代码示例来源：origin: gocd/gocd

private void run() {
  Handler.init();
  try (JarFile jarFile = new JarFile(currentJarFile())) {
    String mainClassName = mainClassName(jarFile);
    List<URL> jarsInJar = jarFile.stream()
        .filter(FIND_JAR_FILES_UNDER_LIB_FOLDER)
        .map(jarEntry -> Handler.toOneJarUrl(jarEntry.getName()))
        .collect(Collectors.toList());
    List<URL> urls = new ArrayList<>();
    urls.addAll(additionalJarsInLibsDirectoryInCWD());
    urls.addAll(jarsInJar);
    ClassLoader jcl = new URLClassLoader(urls.toArray(new URL[0]), getClass().getClassLoader());
    Thread.currentThread().setContextClassLoader(jcl);
    Class<?> mainClass = jcl.loadClass(mainClassName);
    mainClass.getMethod("main", String[].class).invoke(null, new Object[]{args});
  } catch (IOException | ReflectiveOperationException e) {
    e.printStackTrace();
    System.exit(1);
  }
}

代码示例来源：origin: stackoverflow.com

ClassLoader currentThreadClassLoader
 = Thread.currentThread().getContextClassLoader();

// Add the conf dir to the classpath
// Chain the current thread classloader
URLClassLoader urlClassLoader
 = new URLClassLoader(new URL[]{new File("mtFile").toURL()},
           currentThreadClassLoader);

// Replace the thread classloader - assumes
// you have permissions to do so
Thread.currentThread().setContextClassLoader(urlClassLoader);

代码示例来源：origin: line/armeria

static WebAppContext newWebAppContext() throws MalformedURLException {
  final WebAppContext handler = new WebAppContext();
  handler.setContextPath("/");
  handler.setBaseResource(Resource.newResource(webAppRoot()));
  handler.setClassLoader(new URLClassLoader(
      new URL[] {
          Resource.newResource(new File(webAppRoot(),
                         "WEB-INF" + File.separatorChar +
                         "lib" + File.separatorChar +
                         "hello.jar")).getURI().toURL()
      },
      JettyService.class.getClassLoader()));
  handler.addBean(new ServletContainerInitializersStarter(handler), true);
  handler.setAttribute(
      "org.eclipse.jetty.containerInitializers",
      Collections.singletonList(new ContainerInitializer(new JettyJasperInitializer(), null)));
  return handler;
}

代码示例来源：origin: apache/hive

public static void addJarToContextLoader(File jar) throws MalformedURLException {
 ClassLoader loader = Thread.currentThread().getContextClassLoader();
 if (loader instanceof MutableURLClassLoader) {
  ((MutableURLClassLoader) loader).addURL(jar.toURI().toURL());
 } else {
  URLClassLoader newLoader =
    new URLClassLoader(new URL[]{jar.toURI().toURL()}, loader);
  Thread.currentThread().setContextClassLoader(newLoader);
 }
}

代码示例来源：origin: hibernate/hibernate-orm

private ClassLoader toClassLoader(FileCollection runtimeClasspath) {
  List<URL> urls = new ArrayList<URL>();
  for ( File file : runtimeClasspath ) {
    try {
      urls.add( file.toURI().toURL() );
      logger.debug( "Adding classpath entry for " + file.getAbsolutePath() );
    }
    catch (MalformedURLException e) {
      throw new GradleException( "Unable to resolve classpath entry to URL : " + file.getAbsolutePath(), e );
    }
  }
  return new URLClassLoader( urls.toArray( new URL[urls.size()] ), Enhancer.class.getClassLoader() );
}

代码示例来源：origin: apache/incubator-druid

public Class<TBase> getThriftClass()
  throws IOException, ClassNotFoundException, IllegalAccessException, InstantiationException
{
 final Class<TBase> thrift;
 if (jarPath != null) {
  File jar = new File(jarPath);
  URLClassLoader child = new URLClassLoader(
    new URL[]{jar.toURI().toURL()},
    this.getClass().getClassLoader()
  );
  thrift = (Class<TBase>) Class.forName(thriftClassName, true, child);
 } else {
  thrift = (Class<TBase>) Class.forName(thriftClassName);
 }
 thrift.newInstance();
 return thrift;
}

代码示例来源：origin: apache/hive

/**
 * Add new elements to the classpath.
 *
 * @param newPaths Map of classpath elements and corresponding timestamp
 * @return locally accessible files corresponding to the newPaths
 */
public static List<String> addToClassPath(Map<String, Long> newPaths, Configuration conf,
  File localTmpDir) throws Exception {
 URLClassLoader loader = (URLClassLoader) Thread.currentThread().getContextClassLoader();
 List<URL> curPath = Lists.newArrayList(loader.getURLs());
 List<String> localNewPaths = new ArrayList<>();
 boolean newPathAdded = false;
 for (Map.Entry<String, Long> entry : newPaths.entrySet()) {
  URL newUrl = urlFromPathString(entry.getKey(), entry.getValue(), conf, localTmpDir);
  localNewPaths.add(newUrl.toString());
  if (newUrl != null && !curPath.contains(newUrl)) {
   curPath.add(newUrl);
   LOG.info("Added jar[" + newUrl + "] to classpath.");
   newPathAdded = true;
  }
 }
 if (newPathAdded) {
  URLClassLoader newLoader =
    new URLClassLoader(curPath.toArray(new URL[curPath.size()]), loader);
  Thread.currentThread().setContextClassLoader(newLoader);
 }
 return localNewPaths;
}

代码示例来源：origin: org.springframework/spring-webmvc

/**
 * Create a parent ClassLoader for Groovy to use as parent ClassLoader
 * when loading and compiling templates.
 */
protected ClassLoader createTemplateClassLoader() throws IOException {
  String[] paths = StringUtils.commaDelimitedListToStringArray(getResourceLoaderPath());
  List<URL> urls = new ArrayList<>();
  for (String path : paths) {
    Resource[] resources = getApplicationContext().getResources(path);
    if (resources.length > 0) {
      for (Resource resource : resources) {
        if (resource.exists()) {
          urls.add(resource.getURL());
        }
      }
    }
  }
  ClassLoader classLoader = getApplicationContext().getClassLoader();
  Assert.state(classLoader != null, "No ClassLoader");
  return (!urls.isEmpty() ? new URLClassLoader(urls.toArray(new URL[0]), classLoader) : classLoader);
}

代码示例来源：origin: jshiell/checkstyle-idea

public ClassLoader build(final Module baseModule) {
  if (baseModule == null) {
    return getClass().getClassLoader();
  }
  final Project project = baseModule.getProject();
  final List<URL> outputPaths = new ArrayList<>();
  final Set<Module> transitiveDependencies = new HashSet<>();
  ModuleUtil.getDependencies(baseModule, transitiveDependencies);
  for (Module moduleInScope : transitiveDependencies) {
    if (LOG.isDebugEnabled()) {
      LOG.debug("Adding module to classpath: " + moduleInScope.getName());
    }
    outputPaths.addAll(ModulePaths.compilerOutputPathsFor(moduleInScope));
    outputPaths.addAll(ModulePaths.libraryPathsFor(moduleInScope));
  }
  if (LOG.isDebugEnabled()) {
    LOG.debug("Creating class-loader with URLs: " + outputPaths);
  }
  URL[] effectiveClasspath = outputPaths.toArray(new URL[outputPaths.size()]);
  if (wantsCopyLibs()) {
    final Optional<File> tempDir = new TempDirProvider().forCopiedLibraries(project);
    if (tempDir.isPresent()) {
      final Path t = Paths.get(tempDir.get().toURI());
      effectiveClasspath = new ClasspathStabilizer(project, t).stabilize(outputPaths);
    }
  }
  return new URLClassLoader(effectiveClasspath, getClass().getClassLoader());
}

代码示例来源：origin: joelittlejohn/jsonschema2pojo

@Override
  public ClassLoader run() {
    return new URLClassLoader(classpathUrls.toArray(new URL[classpathUrls.size()]), parentClassloader);
  }
});

代码示例来源：origin: google/guava

@AndroidIncompatible // Android forbids null parent ClassLoader
public void testClassPathEntries_duplicateUri_parentWins() throws Exception {
 URL url = new URL("file:/a");
 URLClassLoader parent = new URLClassLoader(new URL[] {url}, null);
 URLClassLoader child = new URLClassLoader(new URL[] {url}, parent) {};
 assertThat(ClassPath.Scanner.getClassPathEntries(child))
   .containsExactly(new File("/a"), parent);
}

代码示例来源：origin: apache/nifi

/**
   *
   */
  private static boolean isConfigResolvable(String configPath, File libDirPathFile) {
    List<URL> urls = new ArrayList<>();
    URLClassLoader parentLoader = (URLClassLoader) SpringContextProcessor.class.getClassLoader();
    urls.addAll(Arrays.asList(parentLoader.getURLs()));

    urls.addAll(SpringContextFactory.gatherAdditionalClassPathUrls(libDirPathFile.getAbsolutePath()));
    boolean resolvable = false;
    try (URLClassLoader throwawayCl = new URLClassLoader(urls.toArray(new URL[] {}), null)) {
      resolvable = throwawayCl.findResource(configPath) != null;
    } catch (IOException e) {
      // ignore since it can only happen on CL.close()
    }
    return resolvable;
  }
}

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