我正在學習如何進行 XML 解析，并收到了一個解析 XML 文件的作業(yè)，如下所示：<?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>我需要將其解析為如下所示：Van (VID-12345) Customers Adams, Maurice at 123 4th St, 13126 Baxter, Robert at 234 5th St, 13126Cart (VID-23456) Customers Charles, Steven at 345 6th St, 13126我如何解析它看起來像這樣？我讀過很多教程，但它們要么使用非常復雜的 XML，要么使用非常簡單的 XML 作為示例，但我認為這與創(chuàng)建列表和創(chuàng)建要解析的對象有關。我已經(jīng)嘗試了很多小時來尋找解決方案，但無法找到正確的方法。一個解決方案會很好，但即使是一個提示（和教程鏈接）也有助于指導我。我真的很感謝任何幫助。這也是我到目前為止所得到的：
2 回答
ABOUTYOU
TA貢獻1812條經(jīng)驗 獲得超5個贊
像這樣寫：
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"));
}
}
}
如果您不想要該Customers行（如果沒有），那么您需要跟蹤是否已經(jīng)打印了該行，例如：
public class MyHandler extends DefaultHandler {
private boolean firstCustomer;
@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") + ")");
firstCustomer = true;
}
if (qName.equalsIgnoreCase("cart")) {
System.out.println("Cart (" + attributes.getValue("id") + ")");
firstCustomer = true;
}
if (qName.equalsIgnoreCase("customer")) {
if (firstCustomer) {
firstCustomer = false;
System.out.println(" Customers");
}
System.out.println(" " + attributes.getValue("lastName") + ", " + attributes.getValue("firstName") + " at " + attributes.getValue("streetAddress") + ", " + attributes.getValue("zipCode"));
}
}
}
輸出（來自上述兩個版本）
---=== Report ===---
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
---=== End of Report ===---
至尊寶的傳說
TA貢獻1789條經(jīng)驗 獲得超10個贊
看起來你已經(jīng)掌握了大部分內容。只需刪除一些打印線，它應該看起來像你想要的樣子。
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") + ")");
}
}
}
結果應該是這樣的：
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
您添加了額外的 println ，其中添加了額外的 "------====== blah ======-----" 。另外，由于 "println("customer") 位于 if 語句內部，因此每次 qName 等于 customer 時它都會打印它。因此將其放在外面，這樣它看起來與您正在尋找的產(chǎn)品相似！
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