• spring


    1.创建bean.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <beans>
        <bean id="userController" class="com.augmentum.oes.controller.UserController" scope="singleton"></bean>
        <bean id="questionServiceImpl" class="com.augmentum.oes.service.impl.QuestionServiceImpl" scope="singleton"></bean>
        <bean id="userDaoImpl" class="com.augmentum.oes.dao.impl.UserDaoImpl" scope="singleton"></bean>
        
        
        <bean id="questionController" class="com.augmentum.oes.controller.QuestionController" scope="singleton">
            <property name="questionServiceImpl" ref="questionServiceImpl" value=""/>
        </bean>
        <bean id="questionServiceImpl" class="com.augmentum.oes.service.impl.QuestionServiceImpl" scope="singleton">
            <property name="questionDaoImpl" ref="questionDaoImpl"/>
        </bean>
        <bean id="questionDaoImpl" class="com.augmentum.oes.dao.impl.QuestionDaoImpl" scope="singleton">
            <property name="jdbcTemplete" ref="jdbcTemplete"/>
        </bean>
        <bean id="jdbcTemplete" class="com.augmentum.oes.common.JDBCTemplete" scope="singleton" ></bean>
    </beans>
    bean.xml

    2.存储model

    package com.augmentum.oes.common;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class BeanConfig {
        private String id;
        private String className;
        private String scope;
    
        private List<BeanProperty> properties = new ArrayList<BeanProperty>();
    
        public void addProperty(BeanProperty property) {
            properties.add(property);
        }
    
        public List<BeanProperty> getProperties() {
            return properties;
        }
    
        public void setProperties(List<BeanProperty> properties) {
            if (properties == null) {
                properties = new ArrayList<BeanProperty>();
            }
            this.properties = properties;
        }
    
        public String getId() {
            return id;
        }
    
        public void setId(String id) {
            this.id = id;
        }
    
        public String getClassName() {
            return className;
        }
    
        public void setClassName(String className) {
            this.className = className;
        }
    
        public String getScope() {
            return scope;
        }
    
        public void setScope(String scope) {
            this.scope = scope;
        }
    
    }
    BeanConfig
    package com.augmentum.oes.common;
    
    public class BeanProperty {
        private String name;
        private String value;
        private String ref;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getValue() {
            return value;
        }
    
        public void setValue(String value) {
            this.value = value;
        }
    
        public String getRef() {
            return ref;
        }
    
        public void setRef(String ref) {
            this.ref = ref;
        }
    
    }
    BeanProperty

    3.创建工厂

    package com.augmentum.oes.common;
    
    import java.io.InputStream;
    import java.lang.reflect.Method;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import javax.xml.parsers.DocumentBuilder;
    import javax.xml.parsers.DocumentBuilderFactory;
    
    import org.w3c.dom.Document;
    import org.w3c.dom.Element;
    import org.w3c.dom.NodeList;
    
    import com.augmentum.oes.servlet.DispatcherServlet;
    
    public class BeanFactory {
        private static Map<String, BeanConfig> beans = new HashMap<String, BeanConfig>();
    
        private static Map<String, Object> objects = new HashMap<String, Object>();
    
        private static BeanFactory beanFactory;
    
        public Object getBean(String id) {
            if (beans.containsKey(id)) {
                BeanConfig bean = beans.get(id);
                String scope = bean.getScope();
                if (scope == null || scope.equals("")) {
                    scope = "singleton";
                }
                if (scope.equalsIgnoreCase("singleton")) {
                    if (objects.containsKey(id)) {
                        return objects.get(id);
                    }
                }
    
                String className = bean.getClassName();
                Class<?> clz = null;
                try {
                    clz = Class.forName(className);
                    Object object = clz.newInstance();
    
                    if (scope.equalsIgnoreCase("singleton")) {
                        objects.put(id, object);
                    }
                    List<BeanProperty> beanProperties = bean.getProperties();
    
                    if (beanProperties != null || !beanProperties.isEmpty()) {
                        for (BeanProperty beanProperty : beanProperties) {
                            String name = beanProperty.getName();
                            String fistChar = name.substring(0,1);
                            String leaveChar = name.substring(1);
                            String methodName ="set"+ fistChar.toUpperCase()+leaveChar;
    
                            Method method = null;
                            Method[] methods = clz.getMethods();
                            //find in object method
                            for (Method methodInClass : methods) {
                                String methodNameInClass = methodInClass.getName();
                                if (methodNameInClass.equals(methodName)) {
                                    method = methodInClass;
                                    break;
                                }
                            }
    
                            String ref = beanProperty.getRef();
                            String value = beanProperty.getValue();
                            if (ref != null && !ref.trim().equals("")) {
                                //digui  get this bean.xml have bean set Object
                                Object refObj = this.getBean(ref);
                                method.invoke(object, refObj);
                            } else if (value != null && !value.trim().equals("")) {
                                Class<?>[] parmts = method.getParameterTypes();
                                String propertyValue = beanProperty.getValue();
                                if (parmts[0]==String.class) {
                                    method.invoke(object, propertyValue);
                                }
                                if (parmts[0]==int.class) {
                                    method.invoke(object, Integer.parseInt(propertyValue));
                                }
                                if (parmts[0]==boolean.class) {
                                    method.invoke(object, Boolean.parseBoolean(propertyValue));
                                }
                            }
                        }
                    }
    
                    return object;
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            return null;
        }
    
        private BeanFactory(){}
        //thread  join
        public static BeanFactory getInstance() {
            if (beanFactory == null) {
                beanFactory = new BeanFactory();
                beanFactory.init();
            }
            return beanFactory;
        }
    
        private void init() {
            InputStream inputStream = null;
            try {
                inputStream = DispatcherServlet.class.getClassLoader().getResourceAsStream("bean.xml");
    
                DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
                DocumentBuilder builder = factory.newDocumentBuilder();
                Document document = builder.parse(inputStream);
                Element element = document.getDocumentElement();
    
                NodeList beanNodes = element.getElementsByTagName("bean");
                if (beanNodes == null) {
                    return;
                }
                int beanLength = beanNodes.getLength();
                for (int i = 0; i < beanLength; i++) {
                    Element beanElement = (Element) beanNodes.item(i);
                    BeanConfig bean = new BeanConfig();
                    String id = beanElement.getAttribute("id");
                    bean.setId(id);
                    String className = beanElement.getAttribute("class");
                    bean.setClassName(className);
                    String scope = beanElement.getAttribute("scope");
                    bean.setScope(scope);
    
                    beans.put(id, bean);
    
                    NodeList beanPropertyNodes = beanElement.getElementsByTagName("property");
    
                    if (beanPropertyNodes != null|| !beanPropertyNodes.equals("")) {
                        int beanPropertyLength = beanPropertyNodes.getLength();
                        for (int j = 0; j < beanPropertyLength; j++) {
                            Element beanPropertyElement = (Element) beanPropertyNodes.item(j);
                            BeanProperty beanProperty = new BeanProperty();
                            beanProperty.setName(beanPropertyElement.getAttribute("name"));
                            beanProperty.setRef(beanPropertyElement.getAttribute("ref"));
                            beanProperty.setValue(beanPropertyElement.getAttribute("value"));
    
                            bean.addProperty(beanProperty);
                        }
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
    
        }
    }
    BeanFactory

    4.set注入

    ApplicationContext的主要实现类
    [1]ClassPathXmlApplicationContext:对应类路径下的XML格式的配置文件
    [2]FileSystemXmlApplicationContext:对应文件系统中的XML格式的配置文件
     
     <context:property-placeholder location="classpath:jdbc.properties"/>
     
    注解开发 :
    ①普通组件:@Component
    标识一个受Spring IOC容器管理的组件
    ②持久化层组件:@Respository
    标识一个受Spring IOC容器管理的持久化层组件
    ③业务逻辑层组件:@Service
    标识一个受Spring IOC容器管理的业务逻辑层组件
    ④表述层控制器组件:@Controller
    标识一个受Spring IOC容器管理的表述层控制器组件
    ⑤组件命名规则
    [1]默认情况:使用组件的简单类名首字母小写后得到的字符串作为bean的id
    [2]使用组件注解的value属性指定bean的id
    <context:component-scan base-package="com.atguigu.component" esource-pattern="autowire/*.class"/>注解使用的包  esource-pattern过滤扫描特定的类
    <context:include-filter> 子节点表示要包含的目标类 <context:exclude-filter>子节点表示要排除在外的目标类
     

    二.  AOP  

    <aop:aspectj-autoproxy>
    当Spring IOC容器侦测到bean配置文件中的<aop:aspectj-autoproxy>元素时,会自动为与AspectJ切面匹配的bean创建代理
     
    用AspectJ注解声明切面
    ①要在Spring中声明AspectJ切面,只需要在IOC容器中将切面声明为bean实例。②当在Spring IOC容器中初始化AspectJ切面之后,Spring IOC容器就会为那些与 AspectJ切面相匹配的bean创建代理。
    ③在AspectJ注解中,切面只是一个带有@Aspect注解的Java类,它往往要包含很多通知。
    ④通知是标注有某种注解的简单的Java方法。
    ⑤AspectJ支持5种类型的通知注解:
    [1]@Before:前置通知,在方法执行之前执行
    [2]@After:后置通知,在方法执行之后执行
    [3]@AfterRunning:返回通知,在方法返回结果之后执行
    [4]@AfterThrowing:异常通知,在方法抛出异常之后执行
    [5]@Around:环绕通知,围绕着方法执行
    注解切面类
     
    execution([权限修饰符] [返回值类型] [简单类名/全类名] [方法名]([参数列表]))  
    ● 返回通知:无论连接点是正常返回还是抛出异常,后置通知都会执行。如果只想在连接点返回的时候记录日志,应使用返回通知代替后置通知。 ● 使用@AfterReturning注解 ● 在返回通知中访问连接点的返回值 ● 在返回通知中,只要将returning属性添加到@AfterReturning注解中,就可以访问连接点的返回值。该属性的值即为用来传入返回值的参数名称 ● 必须在通知方法的签名中添加一个同名参数。在运行时Spring AOP会通过这个参数传递返回值 ● 原始的切点表达式需要出现在pointcut属性中

      

      ● 异常通知:只在连接点抛出异常时才执行异常通知
    

      

    对于多个切点类作用于一个类上,可以设置优先级@Order(0)@Order(1)

     xml中配置

    先定义在引入<aop:aspect>中

     <aop:config>
            <aop:pointcut expression="execution(* com.augmentum.oes.service..*.*(..))" id="pc"/>
            <aop:advisor pointcut-ref="pc" advice-ref="txAdvice" order="1"/>
        </aop:config>
    
    声明切入点
      ● 切入点使用<aop:pointcut>元素声明。
      ● 切入点必须定义在<aop:aspect>元素下,或者直接定义在<aop:config>元素下。
      ● 定义在<aop:aspect>元素下:只对当前切面有效
      ● 定义在<aop:config>元素下:对所有切面都有效
      ● 基于XML的AOP配置不允许在切入点表达式中用名称引用其他切入点。

    声明通知

     17:06:372017-07-29

    参考实现链接 http://www.cnblogs.com/davidwang456/p/4013631.html
     
     
     

     

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  • 原文地址:https://www.cnblogs.com/mxz1994/p/7245750.html
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