java.beans.beancontext.BeanContext的实例源码（bean java）

25-02-14 17

在本文中，我们将为您详细介绍java.beans.beancontext.BeanContext的实例源码的相关知识，并且为您解答关于beanjava的疑问，此外，我们还会提供一些关于Applicat

在本文中，我们将为您详细介绍java.beans.beancontext.BeanContext的实例源码的相关知识，并且为您解答关于bean java的疑问，此外，我们还会提供一些关于ApplicationContext注入Bean(多线程中注入Bean)、bean实例化的三种方式 bean标签常用属性单例模式和多例模式的对象 BeanFactory和ApplicationContext:、FLEX通过ANE调用安卓 ExtensionContext.createExtensionContext 返回null、java – Spring 3 applicationContext-security-JDBC.xml有bean：bean不是bean？的有用信息。

本文目录一览：

java.beans.beancontext.BeanContext的实例源码（bean java）
ApplicationContext注入Bean(多线程中注入Bean)
bean实例化的三种方式 bean标签常用属性单例模式和多例模式的对象 BeanFactory和ApplicationContext:
FLEX通过ANE调用安卓 ExtensionContext.createExtensionContext 返回null
java – Spring 3 applicationContext-security-JDBC.xml有bean：bean不是bean？

java.beans.beancontext.BeanContext的实例源码（bean java）

项目：incubator-netbeans 文件：SerialDatanode.java

private static Children getChildren(DataObject dobj,boolean noBeanInfo) {
    if (noBeanInfo) {
        return Children.LEAF;
    }
    InstanceCookie inst = (InstanceCookie)dobj.getCookie(InstanceCookie.class);
    if (inst == null) return Children.LEAF;
    try {
        Class clazz = inst.instanceClass();
        if (BeanContext.class.isAssignableFrom(clazz) ||
            BeanContextProxy.class.isAssignableFrom(clazz)) {
            return new InstanceChildren ();
        } else {
            return Children.LEAF;
        }
    } catch (Exception ex) {
        return Children.LEAF;
    }
}

项目：incubator-netbeans 文件：SerialDatanode.java

private void init() {
    try {
        InstanceCookie ic = (InstanceCookie) dobj.getCookie(InstanceCookie.class);
        if (ic == null) {
            bean = null;
            return;
        }
        Class clazz = ic.instanceClass();
        if (BeanContext.class.isAssignableFrom(clazz)) {
            bean = ic.instanceCreate();
        } else if (BeanContextProxy.class.isAssignableFrom(clazz)) {
            bean = ((BeanContextProxy) ic.instanceCreate()).getBeanContextProxy();
        } else {
            bean = null;
        }
    } catch (Exception ex) {
        bean = null;
        Exceptions.printstacktrace(ex);
    }
    if (bean != null) {
        // attaches a listener to the bean
        ((BeanContext) bean).addBeanContextMembershipListener (contextL);
    }
    updateKeys();
}

项目：incubator-netbeans 文件：SerialDatanode.java

/** Create nodes for a given key.
 * @param key the key
 * @return child nodes for this key or null if there should be no
 *   nodes for this key
 */
protected Node[] createNodes(Object key) {
    Object ctx = bean;
    if (bean == null) return new Node[0];

    try {
        if (key instanceof BeanContextSupport) {
            BeanContextSupport bcs = (BeanContextSupport)key;

            if (((BeanContext) ctx).contains (bcs.getBeanContextPeer())) {
                // sometimes a BeanContextSupport occures in the list of
                // beans children even there is its peer. we think that
                // it is desirable to hide the context if the peer is
                // also present
                return new Node[0];
            }
        }

        return new Node[] { new BeanContextNode (key,task) };
    } catch (IntrospectionException ex) {
        // ignore the exception
        return new Node[0];
    }
}

项目：fiscevm 文件：Beans.java

@SuppressWarnings("unchecked")
private static Object internalInstantiate(ClassLoader cls,String beanName,BeanContext context,Object initializer) throws IOException,ClassNotFoundException {
    // First try to load it from a serialization file.

    Object result = null;

    // If it didn't work,try to instantiate it from the given classloader
    ClassLoader classLoader = cls == null ? ClassLoader
            .getSystemClassLoader() : cls;
    try {
        result = Class.forName(beanName,true,classLoader).newInstance();
    } catch (Exception e) {
        throw new ClassNotFoundException(e.getClass() + ": " //$NON-NLS-1$
                + e.getMessage());
    }

    if (result != null) {
        if (null != context) {
            context.add(result);
        }
    }
    return result;
}

项目：cn1 文件：BeanContextServiceAvailableEventTest.java

private void assertEqualsSerially(BeanContextServiceAvailableEvent orig,BeanContextServiceAvailableEvent ser) {
    assertNull(ser.getSource());

    // check propagatedFrom
    if (orig.getPropagatedFrom() instanceof Serializable) {
        BeanContext origFrom = orig.getPropagatedFrom();
        BeanContext serFrom = ser.getPropagatedFrom();
        assertEquals(origFrom.getClass(),serFrom.getClass());
        if (origFrom instanceof MockBeanContextDelegateS) {
            assertEquals(((MockBeanContextDelegateS) origFrom).id,((MockBeanContextDelegateS) serFrom).id);
        }
    }

    // check serviceClass
    assertEquals(orig.getServiceClass(),ser.getServiceClass());
}

项目：cn1 文件：BeanContextMembershipEventTest.java

private void assertEqualsSerially(BeanContextMembershipEvent orig,BeanContextMembershipEvent ser) {
    assertNull(ser.getSource());

    // check propagatedFrom
    if (orig.getPropagatedFrom() instanceof Serializable) {
        BeanContext origFrom = orig.getPropagatedFrom();
        BeanContext serFrom = ser.getPropagatedFrom();
        assertEquals(origFrom.getClass(),((MockBeanContextDelegateS) serFrom).id);
        }
    }

    // check children
    Collection origChildren = (Collection) Utils.getField(orig,"children");
    Collection serChildren = (Collection) Utils.getField(ser,"children");
    assertEquals(origChildren,serChildren);
}

项目：studio 文件：InstanceNode.java

private static Children getChildren(DataObject dobj,boolean noBeanInfo) {
    if (noBeanInfo) {
        return Children.LEAF;
    }
    InstanceCookie inst = (InstanceCookie)dobj.getCookie(InstanceCookie.class);
    if (inst == null) return Children.LEAF;
    try {
        Class clazz = inst.instanceClass();
        if (BeanContext.class.isAssignableFrom(clazz) ||
            BeanContextProxy.class.isAssignableFrom(clazz)) {
            return new InstanceChildren ((InstanceDataObject) dobj);
        } else {
            return Children.LEAF;
        }
    } catch (Exception ex) {
        return Children.LEAF;
    }
}

项目：incubator-netbeans 文件：BeanNode.java

private static Children getChildren(Object bean) {
    if (bean instanceof BeanContext) {
        return new BeanChildren((BeanContext) bean);
    }

    if (bean instanceof BeanContextProxy) {
        BeanContextChild bch = ((BeanContextProxy) bean).getBeanContextProxy();

        if (bch instanceof BeanContext) {
            return new BeanChildren((BeanContext) bch);
        }
    }

    return Children.LEAF;
}

项目：incubator-netbeans 文件：SerialDatanode.java

protected void removeNotify () {
    if (contextL != null && bean != null)
        ((BeanContext) bean).removeBeanContextMembershipListener (contextL);
    contextL = null;

    setKeys(Collections.emptySet());
}

项目：incubator-netbeans 文件：SerialDatanode.java

private void updateKeys() {
    if (bean == null) {
        setKeys(Collections.emptySet());
    } else {
        setKeys(((BeanContext) bean).toArray());
    }
}

项目：incubator-netbeans 文件：SerialDatanode.java

private static Children getChildren (Object bean,SerialDatanode task) {
    if (bean instanceof BeanContext)
        return new BeanChildren ((BeanContext)bean,new beanfactoryImpl(task));
    if (bean instanceof BeanContextProxy) {
        java.beans.beancontext.BeanContextChild bch = ((BeanContextProxy)bean).getBeanContextProxy();
        if (bch instanceof BeanContext)
            return new BeanChildren ((BeanContext)bch,new beanfactoryImpl(task));
    }
    return Children.LEAF;
}

项目：Openjsharp 文件：BeanContextMembershipEvent.java

/**
 * Contruct a BeanContextMembershipEvent
 *
 * @param bc        The BeanContext source
 * @param changes   The Children affected
 * @throws NullPointerException if <CODE>changes</CODE> is <CODE>null</CODE>
 */

@SuppressWarnings("rawtypes")
public BeanContextMembershipEvent(BeanContext bc,Collection changes) {
    super(bc);

    if (changes == null) throw new NullPointerException(
        "BeanContextMembershipEvent constructor:  changes is null.");

    children = changes;
}

项目：jdk8u-jdk 文件：BeanContextMembershipEvent.java

/**
 * Contruct a BeanContextMembershipEvent
 *
 * @param bc        The BeanContext source
 * @param changes   The Children affected
 * @throws NullPointerException if <CODE>changes</CODE> is <CODE>null</CODE>
 */

@SuppressWarnings("rawtypes")
public BeanContextMembershipEvent(BeanContext bc,Collection changes) {
    super(bc);

    if (changes == null) throw new NullPointerException(
        "BeanContextMembershipEvent constructor:  changes is null.");

    children = changes;
}

项目：jdk8u-jdk 文件：Test4652928.java

private static BeanContext fill(BeanContext context) {
    context.add(new JLabel("label"));
    context.add(new JButton("button"));

    JButton button = new JButton();
    button.setText("another button");
    context.add(button);

    return context;
}

项目：openjdk-jdk10 文件：BeanContextMembershipEvent.java

/**
 * Contruct a BeanContextMembershipEvent
 *
 * @param bc        The BeanContext source
 * @param changes   The Children affected
 * @throws NullPointerException if {@code changes} is {@code null}
 */

@SuppressWarnings("rawtypes")
public BeanContextMembershipEvent(BeanContext bc,Collection changes) {
    super(bc);

    if (changes == null) throw new NullPointerException(
        "BeanContextMembershipEvent constructor:  changes is null.");

    children = changes;
}

项目：openjdk-jdk10 文件：Test4652928.java

private static BeanContext fill(BeanContext context) {
    context.add(new JLabel("label"));
    context.add(new JButton("button"));

    JButton button = new JButton();
    button.setText("another button");
    context.add(button);

    return context;
}

项目：openjdk9 文件：BeanContextMembershipEvent.java

/**
 * Contruct a BeanContextMembershipEvent
 *
 * @param bc        The BeanContext source
 * @param changes   The Children affected
 * @throws NullPointerException if {@code changes} is {@code null}
 */

@SuppressWarnings("rawtypes")
public BeanContextMembershipEvent(BeanContext bc,Collection changes) {
    super(bc);

    if (changes == null) throw new NullPointerException(
        "BeanContextMembershipEvent constructor:  changes is null.");

    children = changes;
}

项目：openjdk9 文件：Test4652928.java

private static BeanContext fill(BeanContext context) {
    context.add(new JLabel("label"));
    context.add(new JButton("button"));

    JButton button = new JButton();
    button.setText("another button");
    context.add(button);

    return context;
}

项目：Java8CN 文件：BeanContextMembershipEvent.java

/**
 * Contruct a BeanContextMembershipEvent
 *
 * @param bc        The BeanContext source
 * @param changes   The Children affected
 * @throws NullPointerException if <CODE>changes</CODE> is <CODE>null</CODE>
 */

@SuppressWarnings("rawtypes")
public BeanContextMembershipEvent(BeanContext bc,Collection changes) {
    super(bc);

    if (changes == null) throw new NullPointerException(
        "BeanContextMembershipEvent constructor:  changes is null.");

    children = changes;
}

项目：jdk8u_jdk 文件：BeanContextMembershipEvent.java

/**
 * Contruct a BeanContextMembershipEvent
 *
 * @param bc        The BeanContext source
 * @param changes   The Children affected
 * @throws NullPointerException if <CODE>changes</CODE> is <CODE>null</CODE>
 */

@SuppressWarnings("rawtypes")
public BeanContextMembershipEvent(BeanContext bc,Collection changes) {
    super(bc);

    if (changes == null) throw new NullPointerException(
        "BeanContextMembershipEvent constructor:  changes is null.");

    children = changes;
}

项目：jdk8u_jdk 文件：Test4652928.java

private static BeanContext fill(BeanContext context) {
    context.add(new JLabel("label"));
    context.add(new JButton("button"));

    JButton button = new JButton();
    button.setText("another button");
    context.add(button);

    return context;
}

项目：lookaside_java-1.8.0-openjdk 文件：BeanContextMembershipEvent.java

/**
 * Contruct a BeanContextMembershipEvent
 *
 * @param bc        The BeanContext source
 * @param changes   The Children affected
 * @throws NullPointerException if <CODE>changes</CODE> is <CODE>null</CODE>
 */

@SuppressWarnings("rawtypes")
public BeanContextMembershipEvent(BeanContext bc,Collection changes) {
    super(bc);

    if (changes == null) throw new NullPointerException(
        "BeanContextMembershipEvent constructor:  changes is null.");

    children = changes;
}

项目：lookaside_java-1.8.0-openjdk 文件：Test4652928.java

private static BeanContext fill(BeanContext context) {
    context.add(new JLabel("label"));
    context.add(new JButton("button"));

    JButton button = new JButton();
    button.setText("another button");
    context.add(button);

    return context;
}

项目：repo.kmeanspp.silhouette_score 文件：DataVisualizer.java

/**
 * Set a bean context for this bean
 * 
 * @param bc a <code>BeanContext</code> value
 */
@Override
public void setBeanContext(BeanContext bc) {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment();
    if (!GraphicsEnvironment.isHeadless()) {
      appearanceFinal();
    }
  }
}

项目：repo.kmeanspp.silhouette_score 文件：Loader.java

/**
 * Set a bean context for this bean
 * 
 * @param bc a <code>BeanContext</code> value
 */
@Override
public void setBeanContext(BeanContext bc) {
  super.setBeanContext(bc);
  if (m_design) {
    appearanceDesign();
  } else {
    appearanceFinal();
  }
}

项目：repo.kmeanspp.silhouette_score 文件：CostBenefitAnalysis.java

@Override
public void setBeanContext(BeanContext bc) throws PropertyVetoException {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    if (!GraphicsEnvironment.isHeadless()) {
      appearanceFinal();
    }
  }
}

项目：repo.kmeanspp.silhouette_score 文件：GraphViewer.java

/**
 * Set a bean context for this bean
 * 
 * @param bc a <code>BeanContext</code> value
 */
@Override
public void setBeanContext(BeanContext bc) {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    if (!GraphicsEnvironment.isHeadless()) {
      appearanceFinal();
    }
  }
}

项目：repo.kmeanspp.silhouette_score 文件：ModelPerformanceChart.java

/**
 * Set a bean context for this bean
 * 
 * @param bc a <code>BeanContext</code> value
 */
@Override
public void setBeanContext(BeanContext bc) {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    if (!GraphicsEnvironment.isHeadless()) {
      appearanceFinal();
    }
  }
}

项目：repo.kmeanspp.silhouette_score 文件：TextViewer.java

/**
 * Set a bean context for this bean
 * 
 * @param bc a <code>BeanContext</code> value
 */
@Override
public void setBeanContext(BeanContext bc) {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment();
    if (!GraphicsEnvironment.isHeadless()) {
      appearanceFinal();
    }
  }
}

项目：autoweka 文件：DataVisualizer.java

/**
 * Set a bean context for this bean
 *
 * @param bc a <code>BeanContext</code> value
 */
public void setBeanContext(BeanContext bc) {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    java.awt.GraphicsEnvironment ge = 
      java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(); 
    if (!ge.isHeadless()) {
      appearanceFinal();
    }
  }
}

项目：autoweka 文件：Loader.java

/**
 * Set a bean context for this bean
 *
 * @param bc a <code>BeanContext</code> value
 */
public void setBeanContext(BeanContext bc) {
  super.setBeanContext(bc);
  if (m_design) {
    appearanceDesign();
  } else {
    appearanceFinal();
  }
}

项目：autoweka 文件：CostBenefitAnalysis.java

public void setBeanContext(BeanContext bc) throws PropertyVetoException {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    java.awt.GraphicsEnvironment ge = 
      java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(); 
    if (!ge.isHeadless()) {
      appearanceFinal();
    }
  }
}

项目：autoweka 文件：GraphViewer.java

/**
 * Set a bean context for this bean
 *
 * @param bc a <code>BeanContext</code> value
 */
public void setBeanContext(BeanContext bc) {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    java.awt.GraphicsEnvironment ge = 
      java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(); 
    if (!ge.isHeadless()){
      appearanceFinal();
    }
  }
}

项目：autoweka 文件：ModelPerformanceChart.java

/**
 * Set a bean context for this bean
 *
 * @param bc a <code>BeanContext</code> value
 */
public void setBeanContext(BeanContext bc) {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    java.awt.GraphicsEnvironment ge = 
      java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(); 
    if (!ge.isHeadless()) {
      appearanceFinal();
    }
  }
}

项目：autoweka 文件：TextViewer.java

/**
 * Set a bean context for this bean
 *
 * @param bc a <code>BeanContext</code> value
 */
public void setBeanContext(BeanContext bc) {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    java.awt.GraphicsEnvironment ge = 
      java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(); 
    if (!ge.isHeadless()){
      appearanceFinal();
    }
  }
}

项目：umple 文件：DataVisualizer.java

/**
 * Set a bean context for this bean
 * 
 * @param bc a <code>BeanContext</code> value
 */
@Override
public void setBeanContext(BeanContext bc) {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment();
    if (!GraphicsEnvironment.isHeadless()) {
      appearanceFinal();
    }
  }
}

项目：umple 文件：Loader.java

/**
 * Set a bean context for this bean
 * 
 * @param bc a <code>BeanContext</code> value
 */
@Override
public void setBeanContext(BeanContext bc) {
  super.setBeanContext(bc);
  if (m_design) {
    appearanceDesign();
  } else {
    appearanceFinal();
  }
}

项目：umple 文件：CostBenefitAnalysis.java

@Override
public void setBeanContext(BeanContext bc) throws PropertyVetoException {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    if (!GraphicsEnvironment.isHeadless()) {
      appearanceFinal();
    }
  }
}

项目：umple 文件：GraphViewer.java

/**
 * Set a bean context for this bean
 * 
 * @param bc a <code>BeanContext</code> value
 */
@Override
public void setBeanContext(BeanContext bc) {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    if (!GraphicsEnvironment.isHeadless()) {
      appearanceFinal();
    }
  }
}

项目：umple 文件：ModelPerformanceChart.java

/**
 * Set a bean context for this bean
 * 
 * @param bc a <code>BeanContext</code> value
 */
@Override
public void setBeanContext(BeanContext bc) {
  m_beanContext = bc;
  m_design = m_beanContext.isDesignTime();
  if (m_design) {
    appearanceDesign();
  } else {
    if (!GraphicsEnvironment.isHeadless()) {
      appearanceFinal();
    }
  }
}

ApplicationContext注入Bean(多线程中注入Bean)

文章目录

前言
一、线程中注入Service层或Dao层
总结

前言

通常我们用一下几种方式注入 :

1、@Autowired 是通过 byType 的方式去注入的，使用该注解，要求接口只能有一个实现类。
2、@Resource 可以通过 byName 和 byType的方式注入，默认先按 byName的方式进行匹配，如果匹配不到，再按 byType的方式进行匹配。
3、@Qualifier 注解可以按名称注入，但是注意是类名。

一、线程中注入Service层或Dao层

有些情况我们需要在工具类或在new一个线程之后，线程中注入Service层或Dao层，这时候用以上方法是注入不进去

用以下方法即可注入:

package com.java.base.config;
 
import java.lang.annotation.Annotation;
import java.util.Map;
 
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Service;
/***
 * 
 * <p>Title: MyApplicationContext</p>  
 * <p>Description: ApplicationContextAware 通过它spring容器会自动把上下文环境对象调用ApplicationContextAware接口中的setApplicationContext方法。
 * 				         通过这个上下文环境对象得到spring容器中的Bean
 * 				         在我们写的工具类获取线程中不能直接通过Spring注入，这个时候就需要通过ApplicationContext获取Bean
 * </p>  
 * @author shy  
 */
@Service
public class MyApplicationContext implements ApplicationContextAware {
 
	private static ApplicationContext context;
	
	@Override
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		context = applicationContext;
	}
	
	public static <T> T getBean(final Class<T> requiredType) {
		return context.getBean(requiredType);
	}
 
	public static <T> T getBean(final String beanName) {
		@SuppressWarnings("unchecked")
		final T bean = (T) context.getBean(beanName);
		return bean;
	}
 
	public static <T> Map<String, T> getBeans(final Class<T> requiredType) {
		return context.getBeansOfType(requiredType);
	}
 
	public static Map<String, Object> getBeansWithAnnotation(final Class<? extends Annotation> annotationType) {
		return context.getBeansWithAnnotation(annotationType);
	}
 
}

private XXXrService xxxService = MyApplicationContext.getBean(XXXService.class);

总结

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如果有不对的地方请指正!!!

参考1

bean实例化的三种方式 bean标签常用属性单例模式和多例模式的对象 BeanFactory和ApplicationContext:

bean实例化的三种方式 bean标签常用属性单例模式和多例模式的对象 beanfactory和ApplicationContext:

- 学习网站/博客：
- 1.bean实例化的三种方式：
- 页面结构整体布局：
- 运行结果如下：
- 代码如下：
- - pom.xml:
  - Student:
  - MyStaticFactory :
  - MyInstanceFactory :
  - Test:
  - spring-1.xml:
- 2.bean标签常用属性：
- 代码整体布局：
- 运行结果：
- 添加/修改的代码如下：
- - spring-2.xml:(添加)
  - Student:（修改）
  - (test)Test2:
- 3.单例模式和多例模式的对象：
- 运行结果：
- - God:
  - Test:
  - （singleton）God:(添加)
  - （singleton）Test:(添加)
- 4.BeanFactory和ApplicationContext:

学习网站/博客：

spring https://spring.io/

在这里插入图片描述

The loC Container https://docs.spring.io/spring-framework/docs/current/reference/html/core.html#beans

在这里插入图片描述

Spring官方文档（中文版！！！） https://blog.csdn.net/li1376417539/article/details/104951358/

在这里插入图片描述

1.bean实例化的三种方式：

在这里插入图片描述

页面结构整体布局：

在这里插入图片描述

运行结果如下：

在这里插入图片描述

代码如下：

pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>lesson0820_spring</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <!--引入spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.18</version>
        </dependency>
    </dependencies>


</project>

Student:

package com.entity;

public class Student {

    public Student(){
        System.out.println("这是Student的构造方法...");
    }

    public void introduce(){
        System.out.println("我是一个学生");
    }
}

MyStaticFactory :

package com.factory;

import com.entity.Student;

/**
 * 静态工厂
 */
public class MyStaticFactory {
    /**
     * 静态返回学生实例
     * @return
     */
    public static Student createInstance(){
        System.out.println("调用静态工厂.....MyStaticFactory...createInstance");
        return new Student();
    }
}

MyInstanceFactory :

package com.factory;

import com.entity.Student;

/**
 * 实例工厂
 */
public class MyInstanceFactory {
    /**
     * 定义创建对象的实例方法
     * @return
     */
    public Student createInstance(){
        return new Student();
    }
}

Test:

package com.test;

import com.entity.Student;
import com.factory.MyInstanceFactory;
import com.factory.MyStaticFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClasspathXmlApplicationContext;

public class Test {
    public static void main(String[] args) {
        //Student student = new Student();
        //创建spring bean容器对象
        ApplicationContext ac = new ClasspathXmlApplicationContext("spring-1.xml");
//        Student student = ac.getBean(Student.class);

        //静态工厂创建的对象，通过id名字，获取bean对象
//        Student s = (Student) ac.getBean("stu");
//        s.introduce();

        //实例工厂方式创建对象
        Student s2 = (Student) ac.getBean("stu2");
        s2.introduce();

    }
}

spring-1.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"
        default-lazy-init="true"
        >

    <!--class属性必须配置，用于指明要创建的bean对象的类型
        lazy-init="true":延迟加载(懒汉模式)
        1.bean的方式定义对象
    -->
<!--    <beanlazy-init="true"/>-->

    <!--2.静态工厂方式创建学生对象-->
    <bean id="stu"factory-method="createInstance"/>

    <!--3.实例工厂创建对象-->
    <bean id="fac"/>
    <bean id="stu2" factory-bean="fac" factory-method="createInstance"/>

</beans>

在这里插入图片描述

2.bean标签常用属性：

在这里插入图片描述

代码整体布局：

在这里插入图片描述

运行结果：

在这里插入图片描述

添加/修改的代码如下：

spring-2.xml:(添加)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"
    >

    <!--
    class属性：用于指定要创建的bean对象的类型，必须写的属性
    id属性: 用于唯一标识该类型对象，不能重复，但是可以省略
    name属性: 可以认为是对bean对象起的别名，可以设置多个名字，用空格或逗号分隔。
             现在一般不用
    lazy-init:是否是延迟加载(懒汉，饿汉)。可以在beans中配置全局的延迟加载属性default-lazy-init
    scope:定义创建对象的方式和范围,singleton(单例),prototype(多例),request,session,global-session
          singleton(单例):表示容器中，只有一个对象，每次获取的都是同一个对象
          prototype(多例):每次都是new一个新的对象返回
    init-method:定义bean生命周期的初始化函数
    destroy-method:定义bean生命周期的销毁函数
    -->
    <bean id="stu"
          name="s1 s2"lazy-init="true"
          scope="prototype"
          init-method="initStu"
          destroy-method="destroyStu" />
</beans>

Student:（修改）

package com.entity;

import org.springframework.beans.factory.annotation.Autowired;

public class Student {

    public Student(){
        System.out.println("这是Student的构造方法...");
    }

    //自我介绍
    public void introduce(){
        System.out.println("我是一个学生");
    }

    //学生初始化
    public void initStu(){
        System.out.println("调用了学生的初始化方法");
    }

    //学生销毁
    public void destroyStu(){
        System.out.println("调用了学生的销毁方法");
    }
}

(test)Test2:

package com.test;

import com.entity.Student;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClasspathXmlApplicationContext;

public class Test2 {
    public static void main(String[] args) {
        //创建spring容器
        ApplicationContext ctx = new ClasspathXmlApplicationContext("spring-2.xml");
        //根据id获取学生对象
        Student s1 =(Student) ctx.getBean("stu");
        System.out.println("s1:"+s1);
        //根据类型获取学生对象
        Student s2 = (Student) ctx.getBean(Student.class);
        System.out.println("s2:"+s2);
        //根据id和类型获取学生对象
        Student s3 = ctx.getBean("stu",Student.class);
        System.out.println("s3:"+s3);
        //根据name属性获取学生对象
        Student s4 = (Student) ctx.getBean("s1");
        Student s5 = (Student) ctx.getBean("s2");
        System.out.println("s4:"+s4);
        System.out.println("s5:"+s5);

    }
}

3.单例模式和多例模式的对象：

在这里插入图片描述

运行结果：

在这里插入图片描述

God:

package com.singleton;

public class God {

    public void createWorld(){
        System.out.println("上帝创造了世界....");
    }
}

Test:

package com.singleton;

public class Test {
    public static void main(String[] args) {
        God god = new God();
        god.createWorld();
        System.out.println(god);

        God god2 = new God();
        god2.createWorld();
        System.out.println(god2);
    }
}

（singleton）God:(添加)

package com.singleton;

public class God {

    //3.定义静态私有对象
    private static God god;

    //1.构造私有化
    private God(){

    }

    //2.定义静态工厂获取实例的方法，用于获取对象
    public static God createInstance(){
        if (god==null){
            god = new God();
        }
        return god;
    }

    public void createWorld(){
        System.out.println("上帝创造了世界....");
    }
}

（singleton）Test:(添加)

package com.singleton;

public class Test {
    public static void main(String[] args) {
        God god = God.createInstance();
        god.createWorld();
        System.out.println(god);

        God god2 = God.createInstance();
        god2.createWorld();
        System.out.println(god2);

    }
}

4.beanfactory和ApplicationContext:

在这里插入图片描述

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

FLEX通过ANE调用安卓 ExtensionContext.createExtensionContext 返回null

总结

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如果觉得小编网站内容还不错，欢迎将小编网站推荐给好友。

java – Spring 3 applicationContext-security-JDBC.xml有bean：bean不是bean？

有人可以告诉我在我的ApplicationContext中我必须使用bean：bean而不是bean以及如何修复它.

<?xml version="1.0" encoding="UTF-8"?>

<beans:beans xmlns="http://www.springframework.org/schema/security"
    xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/jdbc
           http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
           http://www.springframework.org/schema/security
           http://www.springframework.org/schema/security/spring-security-3.0.xsd">

    <http auto-config="true" use-expressions="true">
        <intercept-url pattern="/friends/**" access="hasRole('ROLE_USER')" />

        <form-login login-page="/login.html"
        default-target-url="/index.html" always-use-default-target="true"
            authentication-failure-url="/login.html?authFailed=true" />

    </http>

    <authentication-manager alias="authenticationManager">
        <authentication-provider>
            <jdbc-user-service data-source-ref="dataSource" />
        </authentication-provider>
    </authentication-manager>

    <beans:bean id="propertyConfigurer"https://www.jb51.cc/tag/fig/" target="_blank">fig.PropertyPlaceholderConfigurer">
        <beans:property name="location" value="classpath:jdbc.properties" />
    </beans:bean>


    <beans:bean id="dataSource">
        <beans:property name="driverClassName" value="${database.driver}" />
        <beans:property name="url" value="${database.url}" />
        <beans:property name="username" value="${database.user}" />
        <beans:property name="password" value="${database.password}" />
        <beans:property name="initialSize" value="5" />
        <beans:property name="maxActive" value="10" />
    </beans:bean>




</beans:beans>

解决方法

说明.基本上你在这里处理XML命名空间. Spring配置允许您使用来自不同命名空间的配置元素作为扩展基本bean命名空间配置的方法,使用方便的特定于域的配置,如上面的安全配置.

如果您的配置文件集中在其中一个扩展名称空间上 – 再次,让我们使用安全性作为示例 – 如果您将默认名称空间声明为扩展名称空间而不是标准bean名称空间,它可以清理该文件.那是什么

xmlns="http://www.springframework.org/schema/security"

确实 – 它使安全性成为默认命名空间,这意味着您不必使用sec：或security：作为前缀.

但是当您将安全性设置为默认值时,则在使用beans命名空间元素时必须明确.因此bean：前缀.

解.如果您更喜欢bean作为默认值,只需将默认命名空间更改为beans：

xmlns="http://www.springframework.org/schema/beans"

替代方案.或者,如果你想输入更短的东西,你可以这样做

xmlns:b="http://www.springframework.org/schema/beans"

代替

xmlns:beans="http://www.springframework.org/schema/beans"

这将允许你做的事情

<b:bean id="beanId"/>

我们今天的关于java.beans.beancontext.BeanContext的实例源码和bean java的分享已经告一段落，感谢您的关注，如果您想了解更多关于ApplicationContext注入Bean(多线程中注入Bean)、bean实例化的三种方式 bean标签常用属性单例模式和多例模式的对象 BeanFactory和ApplicationContext:、FLEX通过ANE调用安卓 ExtensionContext.createExtensionContext 返回null、java – Spring 3 applicationContext-security-JDBC.xml有bean：bean不是bean？的相关信息，请在本站查询。

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