Java解析XML之 Digester的一个小例子

XML文档

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE po SYSTEM "src/sample.dtd">
<po id="po121" submitted="2001-10-05"
    xmlns="http://www.youkuaiyun.com">
    <billTo id="addr-1">
        <company>The Redzero Cop.</company>
        <street>Jianguo Road 1ST</street>
        <street>Building 1</street>
        <city>Haidian</city>
        <state>Beijing</state>
        <postalCode>100071</postalCode>
    </billTo>
    <shipTo href="addr-1"/>
    <order>
        <item sku="o318-BP" quantity="5">
            <description>J2EE programmic</description>
        </item>
        <item sku="o947-TI" quantity="12">
            <description>Java WEB Service</description>
        </item>
        <item sku="o008-PR" quantity="133">
            <description>C++ develop</description>
        </item>
    </order>
</po>

 Java对象树定义

//根节点，表示一个订单Po
public class Po
...{
    private String id;
    private String submitted;
    private BillTo billTo;
    private ShipTo shipTo;
    private Order order;
    public BillTo getBillTo()
    ...{
        return billTo;
    }
    public void setBillTo(BillTo billTo)
    ...{
        this.billTo = billTo;
    }
    public Order getOrder()
    ...{
        return order;
    }
    public void setOrder(Order order)
    ...{
        this.order = order;
    }
    public ShipTo getShipTo()
    ...{
        return shipTo;
    }
    public void setShipTo(ShipTo shipTo)
    ...{
        this.shipTo = shipTo;
    }
    public String getId()
    ...{
        return id;
    }
    public void setId(String id)
    ...{
        this.id = id;
    }
    public String getSubmitted()
    ...{
        return submitted;
    }
    public void setSubmitted(String submitted)
    ...{
        this.submitted = submitted;
    }    
}
//Po的子节点，标识送货地址，对应<po><billTo>
public class BillTo extends Address
...{
    private String id;

    public String getId()
    ...{
        return id;
    }

    public void setId(String id)
    ...{
        this.id = id;
    }    
}

public class ShipTo extends Address
...{
    private String href;

    public String getHref()
    ...{
        return href;
    }

    public void setHref(String href)
    ...{
        this.href = href;
    }
    
}
public class Address
...{
    private String company;
    private String city;
    private String state;
    private String postalCode;
    private ArrayList streets  = new ArrayList();
    
    public void addStreet(String street)...{
        this.streets.add(street);
    }
    public String getCity()
    ...{
        return city;
    }
    public void setCity(String city)
    ...{
        this.city = city;
    }
    public String getCompany()
    ...{
        return company;
    }
    public void setCompany(String company)
    ...{
        this.company = company;
    }
    public String getPostalCode()
    ...{
        return postalCode;
    }
    public void setPostalCode(String postalCode)
    ...{
        this.postalCode = postalCode;
    }
    public String getState()
    ...{
        return state;
    }
    public void setState(String state)
    ...{
        this.state = state;
    }