Xml2Bean：为Webservice返回Collection准备的一个实用类

作者:fbysss
关键字：Webservice,Xml2Bean

背景：Webservice 返回的是xml，如何得到Collection类型呢?最简单的方式就是把xml还原成Collection。
准备包：commons-digester-1.8.jar
源代码1：Xml2Bean

package 
   cn.edu.ustb.db.task.util;
 
  /** */ 
  /**
 * <p>标题: Xml2Bean.java</p>
 * <p>功能描述: 用于将xml转换成bean<br>
 *
 * </p>
 * <p>版权: Copyright (c) 2007</p>
 * <p>公司: </p>
 * @author fbysss 
 * @version 1.0
 * 
 * </p>
 * <p>修改记录：</p>
 * 创建时间：2007-6-23 13:19:39
 * 类说明：要求jdk1.5版本以上。
 */ 
  
 
  import 
   java.io.IOException;
 
  import 
   java.io.StringReader;
 
  import 
   java.lang.reflect.Field;
 
  import 
   java.util.ArrayList;
 
  import 
   java.util.List;

 
  import 
   org.apache.commons.digester.Digester;
 
  import 
   org.xml.sax.SAXException;
 
  import 
   cn.edu.ustb.db.task.po.Manager;
 
  public 
    
  class 
   Xml2Bean  
  ... 
  {
    public List getObjects(String xml,Object obj)...{
        String beanName = obj.getClass().getSimpleName();
        StringReader xmlReader = new StringReader(xml);
        Digester digester = new Digester();
        digester.setValidating(true);
        digester.addObjectCreate("beans", ArrayList.class);    
        digester.addObjectCreate("beans/"+beanName ,obj.getClass());
        digester.addSetProperties("beans/"+beanName);     
        addSetters(obj, beanName, digester);
        digester.addSetNext("beans/"+beanName, "add");
        ArrayList beans = null;
        try ...{
            beans = (ArrayList) digester.parse(xmlReader);
        } catch (IOException e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SAXException e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return beans;
    }
    /** *//***
     * 一次性添加bean属性的Setter.否则就得一个一个的添加，很费劲。（也许digester有这个功能，但我没找到，只好自己写一个方法了）
     * @param obj
     * @param beanName
     * @param digester
     */
    private void addSetters(Object obj,String beanName, Digester digester) ...{
        Field[] fields = obj.getClass().getDeclaredFields();
        for (Field field : fields) ...{
            digester.addBeanPropertySetter("beans/"+beanName+"/"+field.getName());
        }        
        /**//*digester.addBeanPropertySetter("beans/"+beanName+"/mid");
        digester.addBeanPropertySetter("beans/"+beanName+"/mclass");
        digester.addBeanPropertySetter("beans/"+beanName+"/mname");
        */
    }
    
    public static final void main(String args[])...{
        Xml2Bean x2b = new Xml2Bean();
        String xml = "<?xml versinotallow='1.0' ?> <beans><Manager> <mclass>1</mclass> <mid>1</mid><mname>sss</mname></Manager> <Manager><mclass>2</mclass><mid>1</mid><mname>sss2</mname></Manager></beans>";
        List lst = x2b.getObjects(xml, new Manager());
        for (Object object : lst) ...{
            Manager manager = (Manager) object;
            System.out.println("id:"+manager.getMid()+",name:"+manager.getMname());
        }
    }
    
}

源代码2:Manager.java

package    cn.edu.ustb.db.task.po;
   import 
   java.util.HashSet;
   import 
   java.util.Set;

   public 
    
  class 
   Manager   
  implements 
   java.io.Serializable  
  ... 
  {


    // Fields    

     private Integer mid;
     private String mname;
     private Integer mclass;


    // Constructors

    /** *//** default constructor */
    public Manager() ...{
    }

    /** *//** minimal constructor */
    public Manager(Integer mid) ...{
        this.mid = mid;
    }
    
    /** *//** full constructor */
    public Manager(Integer mid,String mname, Integer mclass) ...{
        this.mid = mid;
        this.mname = mname;
        this.mclass = mclass;

    }
    

   
    // Property accessors

    public Integer getMid() ...{
        return this.mid;
    }
    
    public void setMid(Integer mid) ...{
        this.mid = mid;
    }


    public String getMname() ...{
        return this.mname;
    }
    
    public void setMname(String mname) ...{
        this.mname = mname;
    }

    public Integer getMclass() ...{
        return this.mclass;
    }
    
    public void setMclass(Integer mclass) ...{
        this.mclass = mclass;
    }
}