Java将XML文档文件与JAXB和所选输出进行解组

Java将XML文档文件与JAXB和所选输出进行解组,java,xml,jaxb,unmarshalling,Java,Xml,Jaxb,Unmarshalling,我还是一个编程新手,如果有人能帮我解决这个问题,我将不胜感激。基本上,我有一个电影文件,我想解组,system.out上只有“Robert Benton”个人/导演作为输出 带有JAXBU的Java类 package jaxbadv; import java.io.File; import java.util.Iterator; import java.util.List; import org.me.media.*; /**

我还是一个编程新手,如果有人能帮我解决这个问题,我将不胜感激。基本上,我有一个电影文件,我想解组,system.out上只有“Robert Benton”个人/导演作为输出

带有JAXBU的Java类

        package jaxbadv;

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

    import org.me.media.*;
    /**
     *
     * @author Ket
     */
    public class rbFilms {

    public static void main(String[] args) {
        // Create root XML node 'todaysShow' and get its main element 'movies_today'
        ShowingToday todaysShow = new ShowingToday();
        List<MovieType> movies_today =  todaysShow.getMovieCollection();
        // Create Movie instanses and add them to the 'movies_today' collection
        MovieType film;


        film = new MovieType();
        film.getTitle();
        film.getDirector();
        film.getYear();

        try {
            javax.xml.bind.JAXBContext jaxbCtx = javax.xml.bind.JAXBContext.newInstance(film.getClass().getPackage().getName());
            javax.xml.bind.Unmarshaller unmarshaller = jaxbCtx.createUnmarshaller();
            film = (MovieType) unmarshaller.unmarshal(new java.io.File("Now_Showing.txt")); //NOI18N

            //print out only movies produced after 1990
            MovieType nextMovie = new MovieType();
            Iterator itr = movies_today.iterator();
            while(itr.hasNext()) {
                nextMovie = (MovieType) itr.next();
                if(nextMovie.getDirector() == "Robert Benton") {
                    System.out.println(nextMovie.getTitle());
                }
            }


        } catch (javax.xml.bind.JAXBException ex) {
            // XXXTODO Handle exception
            java.util.logging.Logger.getLogger("global").log(java.util.logging.Level.SEVERE, null, ex); //NOI18N
        }




    }
}
jaxbadv包;
导入java.io.File;
导入java.util.Iterator;
导入java.util.List;
导入org.me.media.*;
/**
*
*@作者Ket
*/
公共类rbFilms{
公共静态void main(字符串[]args){
//创建根XML节点“todaysShow”并获取其主要元素“movies\u today”
ShowingToday todaysShow=新ShowingToday();
列出电影\u todays=todaysShow.getMovieCollection();
//创建电影实例并将其添加到“今日电影”集合中
电影胶片;
电影=新电影类型();
film.getTitle();
电影导演();
film.getYear();
试一试{
javax.xml.bind.JAXBContext jaxbCtx=javax.xml.bind.JAXBContext.newInstance(film.getClass().getPackage().getName());
javax.xml.bind.Unmarshaller Unmarshaller=jaxbCtx.createUnmarshaller();
film=(MovieType)unmarshaller.unmarshal(新的java.io.File(“Now_Showing.txt”);//NOI18N
//仅打印1990年以后制作的电影
MovieType nextMovie=新MovieType();
迭代器itr=movies_today.Iterator();
while(itr.hasNext()){
nextMovie=(MovieType)itr.next();
if(nextMovie.getDirector()=“Robert Benton”){
System.out.println(nextMovie.getTitle());
}
}
}catch(javax.xml.bind.JAXBException ex){
//XXXTODO句柄异常
java.util.logging.Logger.getLogger(“全局”).log(java.util.logging.Level.SEVERE,null,ex);//NOI18N
}
}
}
XML文件

    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Showing_Today xmlns="http://xml.netbeans.org/schema/Shows">
    <movie_collection>
        <Title>Red</Title>
        <Director>Robert Schwentke</Director>
        <Year>2010</Year>
    </movie_collection>
    <movie_collection>
        <Title>Kramer vs Kramer</Title>
        <Director>Robert Benton</Director>
        <Year>1979</Year>
    </movie_collection>
    <movie_collection>
        <Title>La Femme Nikita</Title>
        <Director>Luc Besson</Director>
        <Year>1997</Year>
    </movie_collection>
    <movie_collection>
        <Title>Feast of love</Title>
        <Director>Robert Benton</Director>
        <Year>2007</Year>
    </movie_collection>
</Showing_Today>

红色
罗伯特·斯文克
2010
克莱默对克莱默
罗伯特·本顿
1979
尼基塔女士酒店
吕克·贝松
1997
爱的盛宴
罗伯特·本顿
2007
JAXB绑定生成的源代码-ShowingToday

    package org.me.media;

import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "movieCollection"
})
@XmlRootElement(name = "Showing_Today")
public class ShowingToday {

    @XmlElement(name = "movie_collection")
    protected List<MovieType> movieCollection;

public List<MovieType> getMovieCollection() {
        if (movieCollection == null) {
            movieCollection = new ArrayList<MovieType>();
        }
        return this.movieCollection;
    }

}
package org.me.media;
导入java.util.ArrayList;
导入java.util.List;
导入javax.xml.bind.annotation.XmlAccessType;
导入javax.xml.bind.annotation.XmlAccessorType;
导入javax.xml.bind.annotation.xmlement;
导入javax.xml.bind.annotation.XmlRootElement;
导入javax.xml.bind.annotation.XmlType;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name=),比例={
“电影收藏”
})
@XmlRootElement(name=“今天显示”)
公共课展示日{
@xmlement(name=“电影收藏”)
受保护列表电影收藏;
公共列表getMovieCollection(){
if(movieCollection==null){
movieCollection=newarraylist();
}
返回此.movieCollection;
}
}

您可能希望从一些简单的练习开始,因为代码中存在一些基本的Java错误。例如,您有一些无效的指定:

showingToday todaysShow = new ShowingToday(); // value isn't used
List<MovieType> movies_today =  todaysShow.getMovieCollection(); // value isn't used
你会想要修复这些


就您的特定JAXB问题而言,据我所知,您应该从XML流中反序列化一个
ShowingToday
实例,然后从中访问信息。代码与此类似:

try {
   final JAXBContext context = JAXBContext
         .newInstance(ShowingToday.class);
   final Unmarshaller unmarshaller = context.createUnmarshaller();
   final ShowingToday showingToday = unmarshaller.unmarshal(
         new StreamSource(new File("absolute path of file here")),
         ShowingToday.class).getValue();

} catch (final Exception e) {
   // Do something useful here
}
try {
   final JAXBContext context = JAXBContext
         .newInstance(ShowingToday.class);
   final Unmarshaller unmarshaller = context.createUnmarshaller();
   final ShowingToday showingToday = unmarshaller.unmarshal(
         new StreamSource(new File("absolute path of file here")),
         ShowingToday.class).getValue();

} catch (final Exception e) {
   // Do something useful here
}