我需要有关如何正确解析的帮助

Question

我正在学习如何进行XML解析，并收到了一份作业来解析如下所示的XML文件：

<?xml version="1.0" ?>
<deliveries>
    <van id="VID-12345">
        <package>
            <product taxable="true" productName="Headphones" isbn="123456" unitPrice="10.00" quantity="1"/>
            <product taxable="false" productName="Milk" isbn="234567" unitPrice="2.00" quantity="2"/>
            <customer lastName="Adams" firstName="Maurice" streetAddress="123 4th St" zipCode="13126" accountNumber="ACCT-54321"/>
        </package>
        <package>
            <product taxable="true" productName="Snickers" isbn="345678" unitPrice="1.00" quantity="1"/>
            <product taxable="false" productName="Milk" isbn="234567" unitPrice="2.00" quantity="1"/>
            <customer lastName="Baxter" firstName="Robert" streetAddress="234 5th St" zipCode="13126" accountNumber="ACCT-65432"/>
        </package>
    </van>
    <cart id="VID-23456">
        <package>
            <product taxable="true" productName="Snickers" isbn="345678" unitPrice="1.00" quantity="1"/>
            <customer lastName="Charles" firstName="Steven" streetAddress="345 6th St" zipCode="13126" accountNumber="ACCT-76543"/>
        </package>
    </cart>
</deliveries>

我需要解析它看起来像这样：

Van (VID-12345)
    Customers
        Adams, Maurice at 123 4th St, 13126
        Baxter, Robert at 234 5th St, 13126
Cart (VID-23456)
    Customers
        Charles, Steven at 345 6th St, 13126

我如何解析它看起来像这样？我已经阅读了许多教程，但是它们要么使用非常复杂的XML，要么使用非常简单的XML作为示例，但是我认为它与创建列表和创建要解析的对象有关。我已经尝试了好几个小时才能找到解决方案，但是找不到正确的方法来解决。一个解决方案会很不错，但是即使是提示（以及教程链接）也将有助于指导我。我非常感谢您的帮助。这也是我到目前为止所得到的：

public class MyHandler extends DefaultHandler {

    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {

        if (qName.equalsIgnoreCase("van")) {
            System.out.println("---=== Report ===---");
            System.out.println("Van (" + attributes.getValue("id") + ")");
        }
        if (qName.equalsIgnoreCase("customer")) {
            System.out.println("    Customer");
            System.out.println("        " + attributes.getValue("lastName") + ", " + attributes.getValue("firstName") + " at " + attributes.getValue("streetAddress") + ", " + attributes.getValue("zipCode"));
        }
        if (qName.equalsIgnoreCase("cart")) {
            System.out.println("Cart (" + attributes.getValue("id") + ")");
            System.out.println("---=== End of Report ===---");
        }
    }
}

结果（看起来确实错误）：

---=== Report ===---
Van (VID-12345)
    Customer
        Adams, Maurice at 123 4th St, 13126
    Customer
        Baxter, Robert at 234 5th St, 13126
Cart (VID-23456)
---=== End of Report ===---
    Customer
        Charles, Steven at 345 6th St, 13126

Answer 1

public class MyHandler extends DefaultHandler {

    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {

        if (qName.equalsIgnoreCase("van")) {
            System.out.println("Van (" + attributes.getValue("id") + ")");
        }
        System.out.println("    Customer");
        if (qName.equalsIgnoreCase("customer")) {
            System.out.println("        " + attributes.getValue("lastName") + ", " + attributes.getValue("firstName") + " at " + attributes.getValue("streetAddress") + ", " + attributes.getValue("zipCode"));
        }
        if (qName.equalsIgnoreCase("cart")) {
            System.out.println("Cart (" + attributes.getValue("id") + ")");
        }
    }
}

其结果应为：

Van (VID-12345)
    Customers
        Adams, Maurice at 123 4th St, 13126
        Baxter, Robert at 234 5th St, 13126
Cart (VID-23456)
    Customers
        Charles, Steven at 345 6th St, 13126

Answer 2

public class MyHandler extends DefaultHandler {
    @Override
    public void startDocument() throws SAXException {
        System.out.println("---=== Report ===---");
    }
    @Override
    public void endDocument() throws SAXException {
        System.out.println("---=== End of Report ===---");
    }
    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        if (qName.equalsIgnoreCase("van")) {
            System.out.println("Van (" + attributes.getValue("id") + ")");
            System.out.println("    Customers");
        }
        if (qName.equalsIgnoreCase("cart")) {
            System.out.println("Cart (" + attributes.getValue("id") + ")");
            System.out.println("    Customers");
        }
        if (qName.equalsIgnoreCase("customer")) {
            System.out.println("        " + attributes.getValue("lastName") + ", " + attributes.getValue("firstName") + " at " + attributes.getValue("streetAddress") + ", " + attributes.getValue("zipCode"));
        }
    }
}