JAXB学习

--JAXB基本了解(一)
http://manyuewushuang.iteye.com/blog/684285
--JAXB基本了解(二)
http://www.jdzj.com/data/program/1685.htm
--JAXB基本了解(三)
http://www.iteye.com/topic/33729
--------开发环境-----
1.jdk1.5
2.jwsdp2.0（Java Web Services Developer Pack 2.0， sun的官网上有的下）
3.程序中需要用到的jar包：
%jwsdp2.0安装目录下%/jaxb/lib/jaxb-api.jar
%jwsdp2.0安装目录下%/jaxb/lib/jaxb-impl.jar
%jwsdp2.0安装目录下%/sjsxp/lib/jsr173_api.jar
%jwsdp2.0安装目录下%/jwsdp-shared/lib/activation.jar
4.开发工具：eclipse3.2
---------------------

定义一个XML schema文件--library.xsd

<?xml version="1.0" encoding="UTF-8"?>  
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">  
<xs:element name="librarys" type="librarys"/>  
<xs:complexType name="librarys">  
    <xs:sequence>  
        <xs:element name="library" minOccurs="1" maxOccurs="unbounded">  
            <xs:complexType>  
                <xs:sequence>  
                    <xs:element name="name" type="xs:string"/>  
                    <xs:element name="layer" type="xs:int"/>  
                    <xs:element name="row" type="xs:int"/>  
                    <xs:element name="book" type="book"/>  
                </xs:sequence>  
            </xs:complexType>  
        </xs:element>  
    </xs:sequence>  
</xs:complexType>  
<xs:complexType name="book">  
    <xs:sequence>  
        <xs:element name="bookID" type="xs:string"/>  
        <xs:element name="bookName" type="xs:string"/>  
        <xs:element name="borrowDate" type="xs:date"/>  
        <xs:element name="user" type="user"/>  
    </xs:sequence>  
    <xs:attribute name="description" type="xs:string"/>  
</xs:complexType>  
<xs:complexType name="user">  
    <xs:sequence>  
        <xs:element name="userID" type="xs:string"/>  
        <xs:element name="userName" type="xs:string"/>  
        <xs:element name="userAge" type="xs:int"/>  
    </xs:sequence>  
</xs:complexType>  
</xs:schema>  

再定义jwsdp的xjc工具的binding文件---binding.xjb

<jxb:bindings version="1.0" xmlns:jxb="http://java.sun.com/xml/ns/jaxb" xmlns:xs="http://www.w3.org/2001/XMLSchema">  
  <jxb:bindings schemaLocation="library.xsd" node="/xs:schema"><!-- schemaLocation属性是xsd文件的相对路径 -->  
    <jxb:globalBindings    
    fixedAttributeAsConstantProperty="true"    
    collectionType="java.util.ArrayList"    
    typesafeEnumBase="xs:NCName"    
    choiceContentProperty="false"    
    typesafeEnumMemberName="generateError"    
    enableFailFastCheck="false"    
    generateIsSetMethod="false"    
    underscoreBinding="asCharInWord"/>  
    <jxb:schemaBindings>  
        <jxb:package name="com.cuishen.o_x_mapping.object"/>  
        <!-- 这里是生成的JAVA类文件存放包名 -->  
        <jxb:nameXmlTransform>  
                 <jxb:elementName suffix="Element"/>  
                </jxb:nameXmlTransform>  
    </jxb:schemaBindings>  
    <!-- 这里是定义xsd中一个复合类型与Java类的映射（如果要修改才定义，不修改则不需要） -->  
    <jxb:bindings node="//xs:complexType[@name='librarys']">  
        <jxb:class name="Librarys"/>  
    </jxb:bindings>  
    <jxb:bindings node="//xs:complexType[@name='book']">  
        <jxb:class name="Book"/>  
        <!--　这里是定义复合类型的一个元素名称与Java类中属性的映射（如果要修改才定义，不修改则不需要） -->  
        <jxb:bindings node=".//xs:element[@name='bookID']">  
            <jxb:property name="id"/>  
        </jxb:bindings>  
    </jxb:bindings>  
    <jxb:bindings node="//xs:complexType[@name='user']">  
        <jxb:class name="User"/>  
        <!--　这里是定义复合类型的一个元素名称与Java类中属性的映射（如果要修改才定义，不修改则不需要） -->  
        <jxb:bindings node=".//xs:element[@name='userID']">  
            <jxb:property name="id"/>  
        </jxb:bindings>  
    </jxb:bindings>  
  </jxb:bindings>  
</jxb:bindings> 

注意！binding文件的编码格式要用UTF-8，如果直接把代码粘到eclipse里编码格式就不是UTF-8了，这时xjc工具就要报错了，解决办法就是把这个文件用UltraEdit工具转一下。
可以通过binding文件和xsd文件用jaxb自带的xjc工具自动生成java object，是不是很棒啊^_^

现在写o/x mapping的测试主类----Main.java

package com.cuishen.o_x_mapping;   
  
import java.io.File;   
import java.io.FileInputStream;   
import java.io.FileNotFoundException;   
import java.io.FileOutputStream;   
import java.io.IOException;   
import java.io.OutputStream;   
import java.net.MalformedURLException;   
import java.net.URL;   
import java.util.GregorianCalendar;   
import java.util.List;   
  
import javax.xml.XMLConstants;   
import javax.xml.bind.JAXBContext;   
import javax.xml.bind.JAXBElement;   
import javax.xml.bind.JAXBException;   
import javax.xml.bind.Marshaller;   
import javax.xml.bind.Unmarshaller;   
import javax.xml.bind.ValidationEvent;   
import javax.xml.bind.ValidationEventHandler;   
import javax.xml.bind.ValidationEventLocator;   
import javax.xml.datatype.DatatypeConfigurationException;   
import javax.xml.datatype.DatatypeFactory;   
import javax.xml.datatype.XMLGregorianCalendar;   
import javax.xml.validation.Schema;   
import javax.xml.validation.SchemaFactory;   
  
import com.cuishen.o_x_mapping.object.Book;   
import com.cuishen.o_x_mapping.object.Librarys;   
import com.cuishen.o_x_mapping.object.User;   
import com.cuishen.o_x_mapping.object.ObjectFactory;   
  
import com.cuishen.o_x_mapping.utils.FileUtils;;   
  
/**  
 * o/x mapping测试主类  
 * @author cuishen  
 * @date 2008-4-2  
 * @version 1.0  
 */  
public class Main {   
    public static void object2xml() {   
        try {   
            JAXBContext context = JAXBContext.newInstance("com.cuishen.o_x_mapping.object");   
               
            Librarys libs = new Librarys();   
            List<Librarys.Library> libList = libs.getLibrary();   
               
            User usr = createUser("1011", 28, "cuishen");   
            Book book = createBook("成长比成功更重要", getDate(), "成功励志书", "88-91-211", usr);              
            libList.add(createLibrary("上海图书馆", 2, 4, book));   
               
            usr = createUser("1017", 22, "sanmao");   
            book = createBook("七龙珠", getDate(), "漫画", "34-16-310", usr);               
            libList.add(createLibrary("徐汇图书馆", 3, 11, book));   
               
            // create an element for marshalling   
            JAXBElement<Librarys> element = (new ObjectFactory()).createLibrarys(libs);   
               
            Marshaller m = context.createMarshaller();   
            m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);   
            m.setProperty("jaxb.encoding", "gbk");   
            m.marshal(element, System.out);   
            File xmlFile = FileUtils.makeFile(getXmPath());   
            OutputStream ot = new FileOutputStream(xmlFile);   
            m.marshal(element, ot);   
        } catch (JAXBException e) {   
            e.printStackTrace();   
        } catch (FileNotFoundException e) {   
            e.printStackTrace();   
        } catch (MalformedURLException e) {   
            e.printStackTrace();   
        } catch (IOException e) {   
            e.printStackTrace();   
        }   
    }   
       
    public static void xml2object(Unmarshaller u) {   
        try {   
            //JAXBContext jc = JAXBContext.newInstance( "com.cuishen.o_x_mapping.object" );   
               
            //Unmarshaller u = jc.createUnmarshaller();   
               
            // unmarshal a po instance document into a tree of Java content   
            // objects composed of classes from the com.cuishen.o_x_mapping.object package.   
            JAXBElement poe = (JAXBElement)u.unmarshal(new FileInputStream(getXmPath()));   
            Librarys librarys = (Librarys)poe.getValue();   
               
            List libList = librarys.getLibrary();   
            for(int i = 0; i < libList.size(); i++) {   
                Librarys.Library lib = (Librarys.Library)libList.get(i);   
                System.out.println("librarys ==> ");   
                System.out.println("===> library :");   
                System.out.println("=========> layer " + lib.getLayer());   
                System.out.println("=========> name " + lib.getName());   
                System.out.println("=========> row " + lib.getRow());   
                System.out.println("=========> book :");   
                Book book = lib.getBook();   
                System.out.println("=============> id " + book.getId());   
                System.out.println("=============> borrowDate " + book.getBorrowDate());   
                System.out.println("=============> name " + book.getBookName());   
                System.out.println("=============> desc " + book.getDescription());   
                System.out.println("=============> user :");   
                User usr = book.getUser();   
                System.out.println("==================> userID " + usr.getId());   
                System.out.println("==================> userName " + usr.getUserName());   
                System.out.println("==================> Age " + usr.getUserAge());                  
            }   
               
        } catch( JAXBException je ) {   
            je.printStackTrace();   
        } catch( IOException ioe ) {   
            ioe.printStackTrace();   
        }   
    }   
       
    /**  
     * 对xml文件解组时的验证  
     * @return boolean  
     */  
    public static Unmarshaller validate() {   
        // create a JAXBContext capable of handling classes generated into   
        // the com.cuishen.o_x_mapping.object package   
        JAXBContext jc;   
        Unmarshaller u = null;   
        try {   
            jc = JAXBContext.newInstance( "com.cuishen.o_x_mapping.object" );   
               
            u = jc.createUnmarshaller();   
               
            SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);   
            try {   
                Schema schema = sf.newSchema(new File(getXSDPath()));   
                u.setSchema(schema);   
                u.setEventHandler(   
                        new ValidationEventHandler() {   
                            public boolean handleEvent(ValidationEvent ve) {   
                                if (ve.getSeverity() == ValidationEvent.WARNING || ve.getSeverity() != ValidationEvent.WARNING) {   
                                    ValidationEventLocator vel = ve.getLocator();   
                                    System.out.println("Line:Col[" + vel.getLineNumber() + ":" + vel.getColumnNumber() + "]:" + ve.getMessage());   
                                    return false;   
                                }   
                                return true;   
                            }   
                        }   
                );   
            } catch (org.xml.sax.SAXException se) {   
                System.out.println("Unable to validate due to following error.");   
                se.printStackTrace();   
            } catch (MalformedURLException e) {   
                e.printStackTrace();   
            }   
        } catch (JAXBException e) {   
            e.printStackTrace();   
        }   
        return u;   
    }   
       
    private static String getXmPath() throws MalformedURLException {   
        String xmlPath = FileUtils.extractDirPath(FileUtils.extractDirPath(Main.class.getClassLoader().getResource(".").toString()));   
        xmlPath = FileUtils.makeFilePath(xmlPath, "src/com/cuishen/o_x_mapping/xml/library.xml");   
        URL url = new URL(xmlPath);   
        return url.getPath();   
    }   
       
    private static String getXSDPath() throws MalformedURLException {   
        String xsdPath = FileUtils.extractDirPath(FileUtils.extractDirPath(Main.class.getClassLoader().getResource(".").toString()));   
        xsdPath = FileUtils.makeFilePath(xsdPath, "library.xsd");   
        URL url = new URL(xsdPath);   
        System.out.println("xsd path ==========> " + url.getPath());   
        return url.getPath();          
    }   
       
    public static void main(String args[]) {           
        System.out.println("======== object to xml ...");   
        object2xml();   
        System.out.println("======== xml to object ...");   
        xml2object(validate());   
    }   
    public static Librarys.Library createLibrary(String name, int layer, int row, Book book) {   
        Librarys.Library library = new Librarys.Library();   
        library.setName(name);   
        library.setLayer(layer);   
        library.setRow(row);   
        library.setBook(book);   
        return library;   
    }   
    public static Book createBook(String name, XMLGregorianCalendar date, String desc, String id, User usr) {   
        Book book = new Book();   
        book.setBookName(name);   
        book.setBorrowDate(date);   
        book.setDescription(desc);   
        book.setId(id);   
        book.setUser(usr);   
        return book;   
    }   
    public static User createUser(String id, int age, String name) {   
        User usr = new User();   
        usr.setId(id);   
        usr.setUserAge(age);   
        usr.setUserName(name);   
        return usr;   
    }   
    private static XMLGregorianCalendar getDate() {   
        try {   
            return DatatypeFactory.newInstance().newXMLGregorianCalendar(new GregorianCalendar());   
        } catch (DatatypeConfigurationException e) {   
            throw new Error(e);   
        }   
    }   
}  

以上代码的核心是xml文件的编组和解组，用到了接口javax.xml.bind.Marshaller(Marshaller 类负责管理将 Java 内容树序列化回 XML 数据的过程,它提供了基本的编组方法marshal), 以及接口javax.xml.bind.Unmarshaller(Unmarshaller 类管理将 XML 数据反序列化为新创建的 Java 内容树的过程，并可在解组时有选择地验证 XML 数据。它针对各种不同的输入种类提供各种重载的 unmarshal 方法。), 至于xml文件的验证是在解组的时候，调用方法unmarshal会触发验证的机制，验证xml文件是否符合schema的规范。

下面定义build.xml，用ant工具来完成整个项目的编译和运行，方便快捷，^_^

<project basedir="." default="run">  
  <!--这里是jwsdp的安装目录 -->  
  <property name="jwsdp.home" value="d:\Sun\jwsdp-2.0"/>  
  <!--这里是log4j的安装目录 -->  
  <property name="log4j.home" value="D:\conserv\o-x-mapping\implement\lib"/>  
  <path id="xjc.classpath">  
    <pathelement path="src"/>  
    <pathelement path="bin"/>  
    <pathelement path="lib"/>  
    <pathelement path="schemas"/>  
    <!--for use with bundled ant-->  
    <fileset dir="${jwsdp.home}" includes="jaxb/lib/*.jar"/>  
    <fileset dir="${jwsdp.home}" includes="sjsxp/lib/*.jar"/>  
    <fileset dir="${jwsdp.home}" includes="jwsdp-shared/lib/activation.jar"/>  
    <fileset dir="${jwsdp.home}" includes="jwsdp-shared/lib/resolver.jar"/>  
    <fileset dir="${log4j.home}" includes="log4j-1.2.5.jar"/>  
  </path>  
  <taskdef name="xjc" classname="com.sun.tools.xjc.XJCTask">  
    <classpath refid="xjc.classpath" />  
  </taskdef>  
     
    <!--compile Java source files-->  
  <target name="compile" description="Compile all Java source files">  
    <echo message="Compiling the schema..." />  
    <!-- mkdir dir="src" /-->  
    <xjc schema="library.xsd" binding="binding.xjb" destdir="src"/>  
    <echo message="Compiling the java source files..." />  
    <mkdir dir="bin" />  
    <javac destdir="bin" debug="on">  
      <src path="src" />  
      <classpath refid="xjc.classpath" />  
    </javac>  
  </target>  
  
  <target name="run" depends="compile" description="Run the sample app">  
    <echo message="Running the sample application..." />  
    <java classname="com.cuishen.o_x_mapping.Main" fork="true">  
      <classpath refid="xjc.classpath" />  
    </java>  
  </target>  
     
</project>