利用Java反射机制完成XML到对象的解析

package com.sp.util;

/*
 *    author:hingwu
 *  email:hing3@163.com
 *  QQ:550598
 *  MSN:hing3wu@hotmail.com（很少开） 
*/
import java.io.FileInputStream;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

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 exceptions.MyException;

public class ParseXMLToObject {
    public ParseXMLToObject(){}
    
    @SuppressWarnings("unchecked")
    public List getObject(String name,String path,String className){
        DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
        dbf.setIgnoringElementContentWhitespace(true);
        DocumentBuilder db=null;
        Document doc=null;
        InputStream is=null;
        try {
            List list=new ArrayList();
            db=dbf.newDocumentBuilder();
            is=new FileInputStream(this.getClass().getResource(path).getPath());
            doc=db.parse(is);
            //根据要取的对象名称获取相应的节点列表
            NodeList nodes=doc.getElementsByTagName(name);
            if(nodes==null){
                throw new MyException("null nodes with tagName "+name);
            }
            for(int i=0;i<nodes.getLength();i++){
                Element node=(Element) nodes.item(i);
                Class cls=Class.forName(className);
                Object obj=cls.newInstance();
                //获取节点下的所有子节点
                NodeList childs=node.getChildNodes();
                if(childs==null){
                    throw new MyException("null childs! "+node);
                }
                for(int j=0;j<childs.getLength();j++){
                    if(!childs.item(j).getNodeName().equals("#text")){
                        Element child=(Element)childs.item(j);
                        String childName=child.getNodeName();
                        String type=child.getAttribute("type");
                        String value=child.getAttribute("value");
                        Object valueObj=typeConvert(type,value);
                        String methodName="set"+Character.toUpperCase(childName.charAt(0))+childName.substring(1);
                        System.out.println("methodName="+methodName+", class="+Class.forName(type));
                        Method method=cls.getMethod(methodName, Class.forName(type));
                        method.invoke(obj, new Object[]{valueObj});
                    }

                }
                list.add(obj);
            }
            return list;
            
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;
        }

    }
    

//此方法用于将一个字符串转换为相应的数据类型
    @SuppressWarnings("deprecation")
    public Object typeConvert(String className,String value){
        if(className.equals("java.lang.String")){
            return value;
        }
        else if(className.equals("java.lang.Integer")){
            return Integer.valueOf(value);
        }
        else if(className.equals("java.lang.Long")){
            return Long.valueOf(value);
        }
        else if(className.equals("java.lang.Boolean")){
            return Boolean.valueOf(value);
        }
        else if(className.equals("java.util.Date")){
            return new Date(value);
        }
        else if(className.equals("java.lang.Float")){
            return Float.valueOf(value);
        }
        else if(className.equals("java.lang.Double")){
            return Double.valueOf(value);
        }else return null;
    }
}

Subject类的代码：

package com.sp.pojo;

public class Subject {
    private String port;
    private String servletName;
    public String getPort() {
        return port;
    }
    public void setPort(String port) {
        this.port = port;
    }
    public String getServletName() {
        return servletName;
    }
    public void setServletName(String servletName) {
        this.servletName = servletName;
    }
    public Subject(){}
    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return port+","+servletName;
    }
    
}