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誰(shuí)有作業(yè)的答案？

誰(shuí)有作業(yè)的答案？就是視頻最后保存到集合中。還有一個(gè)問(wèn)題屬性值的時(shí)候需要for循環(huán)，怎么到了節(jié)點(diǎn)的時(shí)候沒(méi)有for循環(huán)了呢？

玄鑒

2016-07-25

源自：Java眼中的XML---文件讀取 4-8

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3 回答

tlojy 回答被采納 +3 積分
2016-08-16

package?com.test;

import?java.io.File;
import?java.util.ArrayList;
import?java.util.Iterator;
import?java.util.List;

import?org.dom4j.Attribute;
import?org.dom4j.Document;
import?org.dom4j.DocumentException;
import?org.dom4j.Element;
import?org.dom4j.io.SAXReader;

public?class?DOM4JTest?{
	
	private?static?List<Book>?books?=?new?ArrayList<Book>();

	public?static?void?main(String[]?args)?{
		//?解析books.xml
		SAXReader?reader?=?new?SAXReader();
		try?{
			Document?document?=?reader.read(new?File("src/res/books.xml"));
			Element?bookStore?=?document.getRootElement();
			Iterator?it?=?bookStore.elementIterator();
			while(it.hasNext()){
				Book?bookEntity?=?new?Book();
				Element?book?=?(Element)it.next();
				List<Attribute>?bookAttrs?=?book.attributes();
				for?(Attribute?attr?:?bookAttrs)?{
					System.out.println(attr.getName()+"->"+attr.getValue());
					if(attr.getName().equals("id")){
						bookEntity.setId(attr.getValue());
					}
					
				}
				
				Iterator?itt?=?book.elementIterator();
				while(itt.hasNext()){
					Element?bookChild?=?(Element)itt.next();
					System.out.println(bookChild.getName()+"->"+bookChild.getStringValue());
					switch?(bookChild.getName())?{
					case?"name":
						bookEntity.setName(bookChild.getStringValue());
						break;
					case?"author":
						bookEntity.setAuthor(bookChild.getStringValue());
						break;
					case?"year":
						bookEntity.setYear(bookChild.getStringValue());
						break;
					case?"price":
						bookEntity.setPrice(bookChild.getStringValue());
						break;
					case?"language":
						bookEntity.setLanguage(bookChild.getStringValue());
						break;

					default:
						break;
					}
				}
				
				books.add(bookEntity);
				bookEntity=null;
				System.out.println("--------------------------------");
			}
			for?(Book?book?:?books)?{
				System.out.println(book.toString());
				System.out.println("--------------------------------");
			}
			
		}?catch?(DocumentException?e)?{
			e.printStackTrace();
		}

	}

}

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#1

玄鑒提問(wèn)者

非常感謝！非常感謝

2016-08-16 回復(fù) 有任何疑惑可以回復(fù)我~

tlojy
2016-08-16

package?com.test;

public?class?Book?{
	private?String?id;
	private?String?name;
	private?String?author;
	private?String?year;
	private?String?price;
	private?String?language;
	
	@Override
	public?String?toString()?{
		return?("id->"+id+"\nname->"+name+"\nauthor->"+author+"\nyear->"+year+"\nprice->"+price+"\nlanguage->"+language);
	}
	
	public?String?getId()?{
		return?id;
	}
	public?void?setId(String?id)?{
		this.id?=?id;
	}
	public?String?getName()?{
		return?name;
	}
	public?void?setName(String?name)?{
		this.name?=?name;
	}
	public?String?getAuthor()?{
		return?author;
	}
	public?void?setAuthor(String?author)?{
		this.author?=?author;
	}
	public?String?getYear()?{
		return?year;
	}
	public?void?setYear(String?year)?{
		this.year?=?year;
	}
	public?String?getPrice()?{
		return?price;
	}
	public?void?setPrice(String?price)?{
		this.price?=?price;
	}
	public?String?getLanguage()?{
		return?language;
	}
	public?void?setLanguage(String?language)?{
		this.language?=?language;
	}

}

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慕粉3693314
2016-07-25

for循環(huán)是為了遍歷，每個(gè)book節(jié)點(diǎn)下的屬性值和屬性名。而下面是用了while循環(huán)遍歷book下的節(jié)點(diǎn)名，和節(jié)點(diǎn)值。其實(shí)性質(zhì)是一樣的。而且在上一個(gè)循環(huán)也有用到一個(gè)while循壞來(lái)遍歷book的個(gè)數(shù)的，但還需要遍歷book里面的屬性名和值，所以需要都一層循環(huán)而已。

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