Spring实战之容器中的工程Bean用法示例

<&＃63;xml version="1.0" encoding="GBK"&＃63;>

   
   
      
      
   
   
   
      
      
   

package org.crazyit.app.factory;
import java.lang.reflect.*;
import org.springframework.beans.factory.FactoryBean;
public class GetFieldFactoryBean implements FactoryBean
{
  private String targetClass;
  private String targetField;
  // targetClass的setter方法
  public void setTargetClass(String targetClass)
  {
    this.targetClass = targetClass;
  }
  // targetField的setter方法
  public void setTargetField(String targetField)
  {
    this.targetField = targetField;
  }
  // 返回工厂Bean所生产的产品
  public Object getObject() throws Exception
  {
    Class<&＃63;> clazz = Class.forName(targetClass);
    Field field = clazz.getField(targetField);
    return field.get(null);
  }
  // 获取工厂Bean所生产的产品的类型
  public Class<&＃63; extends Object> getObjectType()
  {
    return Object.class;
  }
  // 返回该工厂Bean所生成的产品是否为单例
  public boolean isSingleton()
  {
    return false;
  }
}

package lee;
import org.springframework.context.*;
import org.springframework.context.support.*;
public class SpringTest
{
  public static void main(String[] args)throws Exception
  {
    ApplicationContext ctx = new
      ClassPathXmlApplicationContext("beans.xml");
    // 下面2行代码获取的FactoryBean的产品
    System.out.println(ctx.getBean("north"));
    System.out.println(ctx.getBean("theValue"));
    // 下面代码可获取的FactoryBean本身
    System.out.println(ctx.getBean("&theValue"));
  }
}

public class BorderLayout implements LayoutManager2,
                   java.io.Serializable {
  /**
   * The north layout constraint (top of container).
   */
  public static final String NORTH = "North";
}

public interface ResultSet extends Wrapper, AutoCloseable {
  int TYPE_SCROLL_SENSITIVE = 1005;
}