import java.io.File;
import java.util.ArrayList;
import java.util.List;import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;/*** 单例上下文对象，配合 spring 使用， 用于获取 Bean* @author YangYxd* @see 在配置中（applicationContext.xml) 加入 * <bean id="SpringApplicationContext" class="包名.ContextHelper"></bean> */
public class ContextHelper implements ApplicationContextAware {private static String XMLName = "applicationContext.xml";private static ApplicationContext applicationContext = null;private static class ApplicationContextHolder {         // 初始化 Context, 尝试搜索常用的存放 ApplicationContext.xml 的位置public static ApplicationContext Init() {ApplicationContext context = null;   try {context = new ClassPathXmlApplicationContext(XMLName);  } catch (Exception e) {}// 在当前项目中搜索配置文件if (context == null) {try {String fileName = findFile(System.getProperty("user.dir"), XMLName);if (fileName != null)context = new FileSystemXmlApplicationContext(fileName);  } catch (Exception e) {} }return context;}      }// 私有化的构造方法，保证外部的类不能通过构造器来实例化。  private ContextHelper() {}/** 设定 XML 名称 */synchronized public static void setXmlName(String name) {XMLName = name;}// 获取单例对象实例  synchronized public static ApplicationContext getInstance() {  if (applicationContext != null)return applicationContext;applicationContext = ApplicationContextHolder.Init();return applicationContext;  }/** * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true  * @param name * @return boolean */  public static boolean containsBean(String name) {  return getInstance().containsBean(name);  }/** * @param name * @return Class 注册对象的类型 */public static Class<?> getType(String name) { try {return getInstance().getType(name);} catch (Exception e) {return null;}}  /** * 如果给定的bean名字在bean定义中有别名，则返回这些别名    * @param name * @return*/  public static String[] getAliases(String name)  {try {return getInstance().getAliases(name); } catch (Exception e) {return null;}}  /** * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 * 如果与给定名字相应的bean定义没有被找到，也会返回 false  * @param name * @return boolean */  public static boolean isSingleton(String name) {try {return getInstance().isSingleton(name);  } catch (Exception e) {return false;}}@SuppressWarnings("static-access")@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {this.applicationContext = applicationContext;System.out.println("ApplicationContextHelper setApplicationContext OK.");}/**   * 查找文件   * @param baseDirName  查找的文件夹路径   * @param targetFileName  需要查找的文件名   */    public static String findFile(String baseDirName, String targetFileName) {   List<File> files = new ArrayList<File>();findFiles(baseDirName, targetFileName, files, true);if (files.isEmpty())return null;return files.get(0).getPath();}/**   * 递归查找文件   * @param baseDirName  查找的文件夹路径   * @param targetFileName  需要查找的文件名   * @param fileList  查找到的文件集合   * @param onlyFirst  是否是查找第一个*/    public static void findFiles(String baseDirName, String targetFileName, List<File> fileList, Boolean onlyFirst) {     File baseDir = new File(baseDirName);       // 创建一个File对象  if (!baseDir.exists() || !baseDir.isDirectory()) {  // 判断目录是否存在  System.out.println("文件查找失败：" + baseDirName + "不是一个目录！");  }  String tempName = null;     //判断目录是否存在
        File tempFile;  File[] files = baseDir.listFiles();  for (int i = 0; i < files.length; i++) {  tempFile = files[i];  if(tempFile.isDirectory()){  findFiles(tempFile.getAbsolutePath(), targetFileName, fileList, onlyFirst);  }else if(tempFile.isFile()){  tempName = tempFile.getName();if (tempName != null && tempName.equalsIgnoreCase(targetFileName)) {  // 匹配成功，将文件名添加到结果集
                    fileList.add(tempFile.getAbsoluteFile()); if (onlyFirst)return;}  }  }  }/*** 获取 Bean* @param beanName* @return*/    @SuppressWarnings("unchecked")public static <T extends Object> T getBean(String beanName) {try {return (T)getInstance().getBean(beanName);} catch (BeansException e) {e.printStackTrace();return null;}}/*** 获取 Bean* @param beanName* @param clazz* @return*/public static <T extends Object> T getBean(String beanName , Class<T>clazz) {  return getInstance().getBean(beanName , clazz);  }/*** @param clazz 通过类模板获取该类* @return 该类的实例，默认单例*/public static <T extends Object> T getBean(Class<T> clazz){try {return getInstance().getBean(clazz);} catch (BeansException e) {e.printStackTrace();return null;}}}

package com.yxd.example.bean;import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.springframework.test.context.ContextConfiguration;@RunWith(BlockJUnit4ClassRunner.class)
@ContextConfiguration({"classpath:applicationContext.xml"})
public class SpringTest {@Testpublic void enumBeans() {//获取spring装配的bean个数  int beanCount = ContextHelper.getInstance().getBeanDefinitionNames().length;  //逐个打印出spring自动装配的bean。根据我的测试，类名第一个字母小写即bean的名字  for(int i=0; i<beanCount; i++){  System.out.println(ContextHelper.getInstance().getBeanDefinitionNames()[i]);  }}
}