问题描述
- java用注解实现将xml中的值获取到并在控制台打印为什么出错
- <?xml version=""1.0"" encoding=""ISO-8859-1"" ?>
- Harry PotterJ K. Rowling200529.99
- Everyday ItalianGiada De Laurentiis200530.00
- Learning XMLErik T. Ray200339.95
- XQuery Kick Start
James McGovern
Per Bothner
Kurt Cagle
James Linn
Vaidyanathan Nagarajan
2003
49.99这是需要获取的xmlpackage per.sww.four.foursenver;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;@XmlRootElement(name=""book"")
public class Book {
public Book(){
super();
}private String category;private Title title; private String author;private String year;private String price;@XmlAttribute(name=""category"")public String getCategory() { return category;}public void setCategory(String category) { this.category = category;}@XmlElement(name=""title"")public Title getTitle() { return title;}public void setTitle(Title title) { this.title = title;}@XmlElement(name=""author"")public String getAuthor() { return author;}public void setAuthor(String author) { this.author = author;}@XmlElement(name=""year"")public String getYear() { return year;}public void setYear(String year) { this.year = year;}@XmlElement(name=""price"")public String getPrice() { return price;}public void setPrice(String price) { this.price = price;}}
package per.sww.four.foursenver;import javax.xml.bind.annotation.XmlAttribute;import javax.xml.bind.annotation.XmlRootElement;@XmlRootElement(name=""title "")public class Title { public Title(){ super(); } private String lang; @XmlAttribute(name=""lang"") public String getLang() { return lang; } public void setLang(String lang) { this.lang = lang; }}package per.sww.four.foursenver;
import java.util.List;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElements;
import javax.xml.bind.annotation.XmlRootElement;@XmlRootElement(name=""book "")
public class Bookstore {
public Bookstore(){
super();
}List<Book> btListl;@XmlElements(value={@XmlElement(name=""book""type=Book.class)})public List<Book> getBtListl() { return btListl;}public void setBtListl(List<Book> btListl) { this.btListl = btListl;}}
package per.sww.four.foursenver;import java.io.File;import javax.xml.bind.JAXBContext;import javax.xml.bind.JAXBException;import javax.xml.bind.Unmarshaller;public class ReadBook { public static void main(String[] args){ try{ JAXBContext jc=JAXBContext.newInstance(Bookstore.class); Unmarshaller u=jc.createUnmarshaller(); Bookstore b=(Bookstore)u.unmarshal(new File(""D:""+File.separator+""3.xml"")); for(Book book:b.getBtListl()){ System.out.println(book.getTitle().getLang()); System.out.println(book.getTitle()); System.out.println(book.getAuthor()); System.out.println(book.getYear()); System.out.println(book.getPrice()); } }catch(JAXBException e){ e.printStackTrace(); } }}javax.xml.bind.UnmarshalException: unexpected element (uri:"""" local:""bookstore""). Expected elements are <{}book><{}book ><{}title >
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext$DefaultRootLoader.childElement(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(Unknown Source)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
at per.sww.four.foursenver.ReadBook.main(ReadBook.java:14)
此代码返回的错误信息如上所示我看了好几遍没找到我的逻辑错误啊请各位大神指点一下名称大小写也检查过了郁闷
解决方案
调试了下发现程序运行到for循环那里就直接跳过了
for(Book book:b.getBtListl()){
System.out.println(book.getTitle().getLang());
System.out.println(book.getTitle());
System.out.println(book.getAuthor());
System.out.println(book.getYear());
System.out.println(book.getPrice());
}
这一块根本就不会进然后就跳到catch了
解决方案二：
这里解析报错，断点看看b返回的是什么，看看b.getBtListl()返回的是什么。
解决方案三：
javax.xml.bind.UnmarshalException: unexpected element (uri:"""" local:""bookstore""). Expected elements are <{}book><{}bookstore ><{}title >
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext$DefaultRootLoader.childElement(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(Unknown Source)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
at per.sww.four.foursenver.ReadBook.main(ReadBook.java:14)
这是错误信息