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common/core/src/main/java/org/funcode/portal/server/common/core/util/ClassUtil.java
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| package org.funcode.portal.server.common.core.util; | ||
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| import lombok.extern.slf4j.Slf4j; | ||
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| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.net.JarURLConnection; | ||
| import java.net.URL; | ||
| import java.net.URLDecoder; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.util.Enumeration; | ||
| import java.util.LinkedHashSet; | ||
| import java.util.Set; | ||
| import java.util.jar.JarEntry; | ||
| import java.util.jar.JarFile; | ||
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| @Slf4j | ||
| public class ClassUtil { | ||
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| /** | ||
| * 从包package中获取所有的Class | ||
| * | ||
| * @param pack 包名 | ||
| * @return 所有类 | ||
| */ | ||
| public static Set<Class<?>> getClasses(String pack) { | ||
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| // 第一个class类的集合 | ||
| Set<Class<?>> classes = new LinkedHashSet<>(); | ||
| // 是否循环迭代 | ||
| boolean recursive = true; | ||
| // 获取包的名字 并进行替换 | ||
| String packageName = pack; | ||
| String packageDirName = packageName.replace('.', '/'); | ||
| // 定义一个枚举的集合 并进行循环来处理这个目录下的things | ||
| Enumeration<URL> dirs; | ||
| try { | ||
| dirs = Thread.currentThread().getContextClassLoader().getResources(packageDirName); | ||
| // 循环迭代下去 | ||
| while (dirs.hasMoreElements()) { | ||
| // 获取下一个元素 | ||
| URL url = dirs.nextElement(); | ||
| // 得到协议的名称 | ||
| String protocol = url.getProtocol(); | ||
| // 如果是以文件的形式保存在服务器上 | ||
| if ("file".equals(protocol)) { | ||
| // 获取包的物理路径 | ||
| String filePath = URLDecoder.decode(url.getFile(), StandardCharsets.UTF_8); | ||
| // 以文件的方式扫描整个包下的文件 并添加到集合中 | ||
| findAndAddClassesInPackageByFile(packageName, filePath, recursive, classes); | ||
| } else if ("jar".equals(protocol)) { | ||
| // 如果是jar包文件 | ||
| // 定义一个JarFile | ||
| JarFile jar; | ||
| try { | ||
| // 获取jar | ||
| jar = ((JarURLConnection) url.openConnection()).getJarFile(); | ||
| // 从此jar包 得到一个枚举类 | ||
| Enumeration<JarEntry> entries = jar.entries(); | ||
| // 同样的进行循环迭代 | ||
| while (entries.hasMoreElements()) { | ||
| // 获取jar里的一个实体 可以是目录 和一些jar包里的其他文件 如META-INF等文件 | ||
| JarEntry entry = entries.nextElement(); | ||
| String name = entry.getName(); | ||
| // 如果是以/开头的 | ||
| if (name.charAt(0) == '/') { | ||
| // 获取后面的字符串 | ||
| name = name.substring(1); | ||
| } | ||
| // 如果前半部分和定义的包名相同 | ||
| if (name.startsWith(packageDirName)) { | ||
| int idx = name.lastIndexOf('/'); | ||
| // 如果以"/"结尾 是一个包 | ||
| if (idx != -1) { | ||
| // 获取包名 把"/"替换成"." | ||
| packageName = name.substring(0, idx).replace('/', '.'); | ||
| } | ||
| // 如果是一个.class文件 而且不是目录 | ||
| if (name.endsWith(".class") && !entry.isDirectory()) { | ||
| // 去掉后面的".class" 获取真正的类名 | ||
| String className = name.substring(packageName.length() + 1, name.length() - 6); | ||
| try { | ||
| // 添加到classes | ||
| classes.add(Class.forName(packageName + '.' + className)); | ||
| } catch (ClassNotFoundException e) { | ||
| log.error("在扫描用户定义视图时从jar包获取文件出错", e); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } catch (IOException e) { | ||
| log.error("在扫描用户定义视图时从jar包获取文件出错", e); | ||
| } | ||
| } | ||
| } | ||
| } catch (IOException e) { | ||
| log.error("在扫描用户定义视图时从jar包获取文件出错", e); | ||
| } | ||
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| return classes; | ||
| } | ||
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| /** | ||
| * 以文件的形式来获取包下的所有Class | ||
| * | ||
| * @param packageName 包的名字 | ||
| * @param packagePath 包的路径 | ||
| * @param recursive 是否循环 | ||
| * @param classes 集合 | ||
| */ | ||
| public static void findAndAddClassesInPackageByFile(String packageName, String packagePath, final boolean recursive, | ||
| Set<Class<?>> classes) { | ||
| // 获取此包的目录 建立一个File | ||
| File dir = new File(packagePath); | ||
| // 如果不存在或者 也不是目录就直接返回 | ||
| if (!dir.exists() || !dir.isDirectory()) { | ||
| // log.warn("用户定义包名 " + packageName + " 下没有任何文件"); | ||
| return; | ||
| } | ||
| // 如果存在 就获取包下的所有文件 包括目录 | ||
| // 自定义过滤规则 如果可以循环(包含子目录) 或则是以.class结尾的文件(编译好的java类文件) | ||
| File[] dirFiles = dir.listFiles(file -> (recursive && file.isDirectory()) || (file.getName().endsWith(".class"))); | ||
| if (dirFiles == null) { | ||
| return; | ||
| } | ||
| // 循环所有文件 | ||
| for (File file : dirFiles) { | ||
| // 如果是目录 则继续扫描 | ||
| if (file.isDirectory()) { | ||
| findAndAddClassesInPackageByFile(packageName + "." + file.getName(), file.getAbsolutePath(), recursive, | ||
| classes); | ||
| } else { | ||
| // 如果是java类文件 去掉后面的.class 只留下类名 | ||
| String className = file.getName().substring(0, file.getName().length() - 6); | ||
| try { | ||
| // 添加到集合中去 | ||
| // classes.add(Class.forName(packageName + '.' + className)); | ||
| // 经过回复同学的提醒，这里用forName有一些不好，会触发static方法，没有使用classLoader的load干净 | ||
| classes.add( | ||
| Thread.currentThread().getContextClassLoader().loadClass(packageName + '.' + className)); | ||
| } catch (ClassNotFoundException e) { | ||
| log.error("添加用户自定义视图类错误 找不到此类的.class文件", e); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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