我的spring容器
public class AplicationContextAnnotationListener implements
??ServletContextListener {
?Map<String, Object> map = new HashMap<String, Object>();
?public void contextDestroyed(ServletContextEvent event) {
??
?}
?public void contextInitialized(ServletContextEvent envent) {
??InputStream in = this.getClass().getResourceAsStream("beans.xml");
??SAXReader reader = new SAXReader();
??Document doc = null;
??try {
???doc = reader.read(in);
???Element root = doc.getRootElement();
???String packageName = root.element("context").attributeValue("base-package");
???Set<Class> classes = this.getClasses(packageName);
???this.instanceBeans(classes);
???this.injectObject(map);
??} catch (DocumentException e) {
???// TODO Auto-generated catch block
???throw new RuntimeException(e);
??}
?}
?
?//注入属性
?private void injectObject(Map<String,Object> map) {
??//对已实例化并存放在map里的所有对象进行迭代 注入属性
??Set<Map.Entry<String, Object>> set = map.entrySet();
??Iterator<Map.Entry<String, Object>> iter = set.iterator();
??while(iter.hasNext()){
???Entry<String, Object> entry = iter.next();
???Object bean = entry.getValue();
???Class beanClass = bean.getClass();
???Field[] fields = beanClass.getDeclaredFields();
???//获取该bean里所有的构造方法
???Constructor[] constructors = beanClass.getConstructors();
???try {
????//获得该对象的属性描述
????PropertyDescriptor[] propertyDescriptors = Introspector.getBeanInfo(beanClass).getPropertyDescriptors();
????for(Field field : fields){
?????if(field.isAnnotationPresent(Resource.class)){
??????String className = field.getAnnotation(Resource.class).value();
??????String fieldName = field.getName();
??????//迭代构造方法看构造方法里的参数有没有这个fileName
??????for(Constructor constructor : constructors){
??????? TypeVariable[] typeVariables = constructor.getTypeParameters();
??????? System.out.println(typeVariables.length);
??????? for(TypeVariable typeVariable : typeVariables){
???????? String variableName = typeVariable.getName();
???????? System.out.println(variableName);
??????? }
??????}
??????Object property = map.get(className);
??????//对属性描述进行迭代 查看标注Resource注解的属性的属性名是否与属性描述相同的
??????for(PropertyDescriptor propertyDescriptor : propertyDescriptors){
???????if(fieldName.equals(propertyDescriptor.getName())){
????????//获取该属性的set方法
????????Method method = propertyDescriptor.getWriteMethod();
????????if(method==null){
?????????continue;
????????}
????????method.invoke(bean, property);
???????}
??????}
?????}
????}
???} catch (Exception e) {
????// TODO Auto-generated catch block
????throw new RuntimeException(e);
???}
??}
?}
?//获取该包及其子包的class
?public Set<Class> getClasses(String packageName){
??//是否允许迭代子包
??boolean recursive = true;
??//定义存放class的集合
??Set<Class> classes = new LinkedHashSet<Class>();
??String packagedir = packageName.replace(".", "/");
??try {
???Enumeration<URL> dirs = Thread.currentThread().getContextClassLoader().getResources(packagedir);
???while(dirs.hasMoreElements()){
????URL url = dirs.nextElement();
????String protocol = url.getProtocol();
????if("file".equals(protocol)){
?????//获取包的物理路径 大致是这个样子/D:/Tomcat 6.0/webapps/upload/WEB-INF/classes/com/cn/service/
?????//不能直接用url.getFile() 否则 结果会是/D:/Tomcat%206.0/webapps/upload/WEB-INF/classes/com/cn/service/
?????String filePath = URLDecoder.decode(url.getFile(), "UTF-8");
?????this.findAndAddClasses(packageName,filePath,classes,recursive);
????}
???}
??} catch (UnsupportedEncodingException e) {
???// TODO Auto-generated catch block
???throw new RuntimeException(e);
??} catch (IOException e) {
???// TODO Auto-generated catch block
???throw new RuntimeException(e);
??}
??return classes;
?}
?public void findAndAddClasses(String packageName,String filePath,Set<Class> classes,final boolean recursive){
??File dir? = new File(filePath);
??//看该路径是否存在 且必须是一个目录
??if(!(dir.exists())||!(dir.isDirectory())){
???return;
??}
??//对文件进行过滤 如果是子包且允许迭代或是一个class文件则不过滤
??File[] dirFiles = dir .listFiles(new FileFilter() {
???public boolean accept(File pathname) {
????return (recursive && pathname.isDirectory())||pathname.getName().endsWith(".class");
???}
??});
??//对文件列表进行迭代
??for(File file:dirFiles ){
???//如果是目录则继续进行扫描
???if(file.isDirectory()){
????findAndAddClasses(packageName+"."+file.getName(),file.getAbsolutePath(),classes,recursive);
???}else{
????//将.class去掉
????String className = file.getName().substring(0, file.getName().length()-6);
????try {
?????//加载该class文件 并将获得的Class添加进classes
?????classes.add(Thread.currentThread().getContextClassLoader().loadClass(packageName+"."+className));
????} catch (ClassNotFoundException e) {
?????// TODO Auto-generated catch block
?????throw new RuntimeException(e);
????}
???}
??}
?}
?
?public void instanceBeans(Set<Class> classes){
??for(Class cls : classes){
???if(cls.isAnnotationPresent(Repository.class)){
????String id = ((Repository) cls.getAnnotation(Repository.class)).id();
????//如果id为""则将该类名的首字母变成小写赋给id
????if("".equals(id)){
?????id = cls.getSimpleName().substring(0,1).toLowerCase().concat(cls.getSimpleName().substring(1));
????}
????try {
?????map.put(id, cls.newInstance());
????} catch (Exception e) {
?????// TODO Auto-generated catch block
?????throw new RuntimeException(e);
????}
???}
??}
?}
?public Object getBean(String beanName){
??return map.get(beanName);
?}
?//查看bean里有没有设置该属性的setter方法
?public boolean hasFieldSetMethod(){
??return false;
?}
?//查看bean里有没有设置该属性的构造方法
?public boolean hasIncludeFiledConstructor(){
??return false;
?}
}
