前面有介绍过json-lib这个框架，在线博文：[http://www.cnblogs.com/hoojo/archive/2011/04/21/2023805.html](http://www.cnblogs.com/hoojo/archive/2011/04/21/2023805.html) 以及Jackson这个框架，在线博文：[http://www.cnblogs.com/hoojo/archive/2011/04/22/2024628.html](http://www.cnblogs.com/hoojo/archive/2011/04/22/2024628.html) 它们都可以完成Java对象到XML的转换，但是还不是那么的完善。 还有XStream对JSON及XML的支持，它可以对JSON或XML的完美转换。在线博文： [http://www.cnblogs.com/hoojo/archive/2011/04/22/2025197.html](http://www.cnblogs.com/hoojo/archive/2011/04/22/2025197.html) 以及介绍Castor来完成Java对象到xml的相互转换。在线博文：[http://www.cnblogs.com/hoojo/archive/2011/04/25/2026819.html](http://www.cnblogs.com/hoojo/archive/2011/04/25/2026819.html) Jaxb2完成xml的转换，在线博文：[http://www.cnblogs.com/hoojo/archive/2011/04/26/2029011.html](http://www.cnblogs.com/hoojo/archive/2011/04/26/2029011.html) Jibx对Java对象的转换相对要负责些，它不仅需要配置xml还且还要生成相应的jar文件，已经xsd文件。下面我们就来慢慢看看Jibx转换Java到XML是如何完成的。 ### 一、准备工作 1、 准备资源 a) 官方示例：[http://jibx.sourceforge.net/fromcode/bindgen-examples.html](http://jibx.sourceforge.net/fromcode/bindgen-examples.html) [http://www.java2s.com/Open-Source/Java/XML/JiBX/tutorial/Catalogtutorial.htm](http://www.java2s.com/Open-Source/Java/XML/JiBX/tutorial/Catalogtutorial.htm) b) Jar下载：[http://sourceforge.net/projects/jibx/files/](http://sourceforge.net/projects/jibx/files/) c) 依赖jar包如下： [](http://hi.csdn.net/attachment/201104/27/0_1303875308wJ6L.gif) 2、 程序准备代码 ~~~ package com.hoo.test; import java.io.IOException; import java.io.StringReader; import java.io.StringWriter; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import org.jibx.runtime.BindingDirectory; import org.jibx.runtime.IBindingFactory; import org.jibx.runtime.IMarshallingContext; import org.jibx.runtime.IUnmarshallingContext; import org.jibx.runtime.JiBXException; import org.junit.After; import org.junit.Before; import org.junit.Test; import com.hoo.entity.Account; import com.hoo.entity.AccountArray; import com.hoo.entity.Birthday; import com.hoo.entity.ListBean; import com.hoo.entity.MapBean; /** * function: Jibx转换Java到XML * @author hoojo * @createDate 2011-4-25 下午06:47:33 * @file JibxTest.java * @package com.hoo.test * @project WebHttpUtils * @blog http://blog.csdn.net/IBM_hoojo * @email hoojo_@126.com * @version 1.0 */ public class JibxTest { private IBindingFactory factory = null; private StringWriter writer = null; private StringReader reader = null; private Account bean = null; @Before public void init() { bean = new Account(); bean.setAddress("北京"); bean.setEmail("email"); bean.setId(1); bean.setName("jack"); Birthday day = new Birthday(); day.setBirthday("2010-11-22"); bean.setBirthday(day); try { factory = BindingDirectory.getFactory(Account.class); } catch (JiBXException e) { e.printStackTrace(); } } @After public void destory() { bean = null; try { if (writer != null) { writer.flush(); writer.close(); } if (reader != null) { reader.close(); } } catch (IOException e) { e.printStackTrace(); } System.gc(); } public void fail(Object o) { System.out.println(o); } public void failRed(Object o) { System.err.println(o); } } ~~~ IBindingFactory是一个工厂接口，通过BindingDirectory的getFactory工厂方法可以获得某个对象。然后通过这个工程可以获得转换xml文档的上下文。 ### 二、转换Java到XML、转换XML到Java 1、 转换JavaEntity对象 a) 首先看看Account、Birthday的代码 ~~~ package com.hoo.entity; public class Account { private int id; private String name; private String email; private String address; private Birthday birthday; //getter、setter @Override public String toString() { return this.id + "#" + this.name + "#" + this.email + "#" + this.address + "#" + this.birthday; } } ~~~ Birthday ~~~ package com.hoo.entity; public class Birthday { private String birthday; public Birthday(String birthday) { super(); this.birthday = birthday; } //getter、setter public Birthday() {} @Override public String toString() { return this.birthday; } } ~~~ b) 程序代码 ~~~ @Test public void bean2XML() { try { writer = new StringWriter(); // marshal 编组 IMarshallingContext mctx = factory.createMarshallingContext(); mctx.setIndent(2); mctx.marshalDocument(bean, "UTF-8", null, writer); fail(writer); reader = new StringReader(writer.toString()); //unmarshal 解组 IUnmarshallingContext uctx = factory.createUnmarshallingContext(); Account acc = (Account) uctx.unmarshalDocument(reader, null); fail(acc); } catch (Exception e) { e.printStackTrace(); } } ~~~ 这样还不够，复杂的东西还在后面。Jibx转换XML文档还要经过一系列复杂的程序。 c) 首先，要写bind.xml和schema。不过还好，官方有提高工具类可以用。 org.jibx.binding.generator.BindGen或org.jibx.binding.BindingGenerator这两个类都可以，用法如下： 首先用dos进入当前工程目录，然后执行命令：E:/Study/WebHttpUtils>java -cp bin;lib/jibx-tools.jar;lib/log4j-1.2.16.jar org.jibx.binding.generator.BindGen -b bind.xml com.hoo.entity.Account 上面的java 是运行某个程序 –cp是依赖的classpath路径的jar、zip等文件，-b 是输出文件名称，是BindGen类的参数。这样会在当前工程目录中生成bind.xml和entity.xsd文件。先看看这2个文件 bind.xml ~~~ <?xml version="1.0" encoding="UTF-8"?> <binding value-style="attribute"> <mapping class="com.hoo.entity.Account" name="account"> <value name="id" field="id"/> <value style="element" name="name" field="name" usage="optional"/> <value style="element" name="email" field="email" usage="optional"/> <value style="element" name="address" field="address" usage="optional"/> <structure field="birthday" usage="optional" name="birthday"> <value style="element" name="birthday" field="birthday" usage="optional"/> </structure> </mapping> </binding> ~~~ entity.xsd文件 ~~~ <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://hoo.com/entity" elementFormDefault="qualified" targetNamespace="http://hoo.com/entity"> <xs:element type="tns:account" name="account"/> <xs:complexType name="account"> <xs:sequence> <xs:element type="xs:string" name="name" minOccurs="0"/> <xs:element type="xs:string" name="email" minOccurs="0"/> <xs:element type="xs:string" name="address" minOccurs="0"/> <xs:element name="birthday" minOccurs="0"> <xs:complexType> <xs:sequence> <xs:element type="xs:string" name="birthday" minOccurs="0"/> </xs:sequence> </xs:complexType> </xs:element> </xs:sequence> <xs:attribute type="xs:int" use="required" name="id"/> </xs:complexType> </xs:schema> ~~~ 上面最重要的就是bind.xml文件了，下面编译的时候需要这个文件。Xsd文件可以根据这个文件的内容生成Java的Entity类代码。 执行完命令后，没有错误就可以运行下面一段命令了。运行命令： E:/Study/WebHttpUtils>java -cp bin;lib/jibx-bind.jar org.jibx.binding.Compile -v bind.xml -v是绑定文件的名称 运行后，有如下结果： [](http://hi.csdn.net/attachment/201104/27/0_1303875324YYOR.gif) d) 然后你就可以运行上面的Java的Junit测试程序了，运行后结果如下： ~~~ <?xml version="1.0" encoding="UTF-8"?> <account xmlns="http://hoo.com/entity" id="1"> <name>jack</name> <email>email</email> <address>北京</address> <birthday> <birthday>2010-11-22</birthday> </birthday> </account> 1#jack#email#北京#2010-11-22 ~~~ 你还可以用命令来查看某个已经生成bind、schema文件的信息，如： java -cp bin;lib/jibx-run.jar org.jibx.runtime.PrintInfo -c com.hoo.entity.Account 结果如下： [](http://hi.csdn.net/attachment/201104/27/0_13038753307lF2.gif) e) 注意，有时候会出现异常信息，如：java.lang.NoSuchFieldException: JiBX_bindingXXXX就要重复下面的命令就可以了。 java -cp bin;lib/jibx-bind.jar org.jibx.binding.Compile -v bind.xml 2、 转换带List集合属性的JavaBean a) 程序代码 ~~~ @Test public void listBean2XML() { try { ListBean listBean = new ListBean(); List list = new ArrayList(); list.add(bean); bean = new Account(); bean.setAddress("china"); bean.setEmail("tom@125.com"); bean.setId(2); bean.setName("tom"); Birthday day = new Birthday("2010-11-22"); bean.setBirthday(day); list.add(bean); listBean.setList(list); writer = new StringWriter(); factory = BindingDirectory.getFactory(ListBean.class); // marshal 编组 IMarshallingContext mctx = factory.createMarshallingContext(); mctx.setIndent(2); mctx.marshalDocument(listBean, "UTF-8", null, writer); fail(writer); reader = new StringReader(writer.toString()); //unmarshal 解组 IUnmarshallingContext uctx = factory.createUnmarshallingContext(); listBean = (ListBean) uctx.unmarshalDocument(reader, null); fail(listBean.getList().get(0)); fail(listBean.getList().get(1)); } catch (Exception e) { e.printStackTrace(); } } ~~~ b) ListBean代码 ~~~ package com.hoo.entity; import java.util.List; public class ListBean { private String name; private List list; } ~~~ c) 生成bind.xml 执行dos命令： java -cp bin;lib/jibx-tools.jar;lib/log4j-1.2.16.jar org.jibx.binding.BindingGenerator -f bind.xml com.hoo.entity.ListBean 输出： [](http://hi.csdn.net/attachment/201104/27/0_1303875331rAMa.gif) d) 执行完后会生产bind.xml Bind文件 ~~~ <?xml version="1.0" encoding="UTF-8"?> <binding value-style="attribute"> <mapping class="com.hoo.entity.ListBean" name="list-bean"> <value style="element" name="name" field="name" usage="optional"/> <collection field="list" usage="optional" factory="org.jibx.runtime.Utility.arrayListFactory"/> </mapping> </binding> ~~~ e) 运行Compile工具类 在运行前，一定要将最先前运行的Account那个类的bind.xml文件的内容加入到现在这个bind.xml中，因为ListBean依赖了Account这个类。 命令如下： java -cp bin;lib/jibx-bind.jar org.jibx.binding.Compile -v bind.xml 运行后你可以看到最后出现这个 [](http://hi.csdn.net/attachment/201104/27/0_130387533372oI.gif) f) 运行Test程序，结果如下： ~~~ <?xml version="1.0" encoding="UTF-8"?> <list-bean> <account id="1"> <name>jack</name> <email>email</email> <address>北京</address> <birthday> <birthday>2010-11-22</birthday> </birthday> </account> <account id="2"> <name>tom</name> <email>tom@125.com</email> <address>china</address> <birthday> <birthday>2010-11-22</birthday> </birthday> </account> </list-bean> 1#jack#email#北京#2010-11-22 2#tom#tom@125.com#china#2010-11-22 ~~~ 3、 转换Java对象数组 a) Test程序 ~~~ /** * function:转换对象数组 * @author hoojo * @createDate 2011-4-26 下午05:32:03 */ @Test public void arrayBean2XML() { try { Account[] acc = new Account[2]; acc[0] = bean; bean = new Account(); bean.setName("tom"); bean.setId(223); acc[1] = bean; AccountArray array = new AccountArray(); array.setAccounts(acc); writer = new StringWriter(); factory = BindingDirectory.getFactory(AccountArray.class); // marshal 编组 IMarshallingContext mctx = factory.createMarshallingContext(); mctx.setIndent(2); mctx.marshalDocument(array, "UTF-8", null, writer); fail(writer); reader = new StringReader(writer.toString()); //unmarshal 解组 IUnmarshallingContext uctx = factory.createUnmarshallingContext(); array = (AccountArray) uctx.unmarshalDocument(reader, null); fail(array.getAccounts()[0]); fail(array.getAccounts()[1]); } catch (Exception e) { e.printStackTrace(); } } ~~~ b) AccountArray代码 ~~~ package com.hoo.entity; public class AccountArray { private Account[] accounts; private int size; public int getSize() { size = accounts.length; return size; } public void setSize(int size) { this.size = size; } public Account[] getAccounts() { return accounts; } public void setAccounts(Account[] accounts) { this.accounts = accounts; } } ~~~ c) 运行命令生成bind.xml文件 命令如下： java -cp bin;lib/jibx-tools.jar;lib/log4j-1.2.16.jar org.jibx.binding.BindingGenerator -f bind.xml com.hoo.entity.Account com.hoo.entity.AccountArray 因为AccountArray依赖Account，所以后面带2个类 [](http://hi.csdn.net/attachment/201104/27/0_1303875335gyP4.gif) d) 运行Compile命令 java -cp bin;lib/jibx-bind.jar org.jibx.binding.Compile -v bind.xml e) 执行完后，就可以运行Test程序了，结果如下 ~~~ <?xml version="1.0" encoding="UTF-8"?> <account-array size="0"> <account id="1"> <name>jack</name> <email>email</email> <address>北京</address> <birthday> <birthday>2010-11-22</birthday> </birthday> </account> <account id="223"> <name>tom</name> </account> </account-array> 1#jack#email#北京#2010-11-22 223#tom#null#null#null ~~~ 4、 转换带Map结合的JavaEntity对象 a) Test代码 ~~~ /** * function:转换Map集合 * @author hoojo * @createDate 2011-4-26 下午05:40:34 */ @Test public void mapBean2XML() { try { MapBean mapBean = new MapBean(); HashMap map = new HashMap(); map.put("No1", bean); bean = new Account(); bean.setAddress("china"); bean.setEmail("tom@125.com"); bean.setId(2); bean.setName("tom"); Birthday day = new Birthday("2010-11-22"); bean.setBirthday(day); map.put("No2", bean); mapBean.setMap(map); factory = BindingDirectory.getFactory(MapBean.class); writer = new StringWriter(); // marshal 编组 IMarshallingContext mctx = factory.createMarshallingContext(); mctx.setIndent(2); mctx.marshalDocument(mapBean, "UTF-8", null, writer); fail(writer); reader = new StringReader(writer.toString()); //unmarshal 解组 IUnmarshallingContext uctx = factory.createUnmarshallingContext(); mapBean = (MapBean) uctx.unmarshalDocument(reader, null); fail(mapBean.getMap()); fail(mapBean.getMap().get("No1")); fail(mapBean.getMap().get("No2")); } catch (Exception e) { e.printStackTrace(); } } ~~~ b) MapBean代码 ~~~ package com.hoo.entity; import java.util.HashMap; public class MapBean { private HashMap map; public HashMap getMap() { return map; } public void setMap(HashMap map) { this.map = map; } } ~~~ c) 生成bind.xml，命令如下 E:/Study/WebHttpUtils>java -cp bin;lib/jibx-tools.jar;lib/log4j-1.2.16.jar org.jibx.binding.BindingGenerator -f bind.xml com.hoo.entity.Account com.hoo.entity.MapBean 运行后，会生产bind.xml；修改bind.xml内容如下： ~~~ <?xml version="1.0" encoding="UTF-8"?> <binding value-style="attribute"> <mapping class="com.hoo.entity.Account" name="account"> <value name="id" field="id" /> <value style="element" name="name" field="name" usage="optional" /> <value style="element" name="email" field="email" usage="optional" /> <value style="element" name="address" field="address" usage="optional" /> <structure field="birthday" usage="optional" name="birthday"> <value style="element" name="birthday" field="birthday" usage="optional" /> </structure> </mapping> <mapping class="com.hoo.entity.MapBean" name="map-bean"> <structure field="map" usage="optional" name="map" marshaller="com.hoo.util.HashMapper" unmarshaller="com.hoo.util.HashMapper"> </structure> </mapping> </binding> ~~~ 注意上面的MapBean的structure元素的内容是经过修改的。一定要带上marshaller或unmarshaller，不然无法转换HashMap的。 d) HashMapper代码 ~~~ package com.hoo.util; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import org.jibx.runtime.IAliasable; import org.jibx.runtime.IMarshallable; import org.jibx.runtime.IMarshaller; import org.jibx.runtime.IMarshallingContext; import org.jibx.runtime.IUnmarshaller; import org.jibx.runtime.IUnmarshallingContext; import org.jibx.runtime.JiBXException; import org.jibx.runtime.impl.MarshallingContext; import org.jibx.runtime.impl.UnmarshallingContext; /** * function:http://www.java2s.com/Open-Source/Java/XML/JiBX/tutorial/example21/HashMapper.java.htm * @file HashMapper.java * @package com.hoo.util * @project WebHttpUtils * @blog http://blog.csdn.net/IBM_hoojo * @email hoojo_@126.com * @version 1.0 */ public class HashMapper implements IMarshaller, IUnmarshaller, IAliasable { private static final String SIZE_ATTRIBUTE_NAME = "size"; private static final String ENTRY_ELEMENT_NAME = "entry"; private static final String KEY_ATTRIBUTE_NAME = "key"; private static final int DEFAULT_SIZE = 10; private String m_uri; private int m_index; private String m_name; public HashMapper() { m_uri = null; m_index = 0; m_name = "hashmap"; } public HashMapper(String uri, int index, String name) { m_uri = uri; m_index = index; m_name = name; } /* (non-Javadoc) * @see org.jibx.runtime.IMarshaller#isExtension(int) */ public boolean isExtension(int index) { return false; } /* (non-Javadoc) * @see org.jibx.runtime.IMarshaller#marshal(java.lang.Object, * org.jibx.runtime.IMarshallingContext) */ public void marshal(Object obj, IMarshallingContext ictx) throws JiBXException { // make sure the parameters are as expected if (!(obj instanceof HashMap)) { throw new JiBXException("Invalid object type for marshaller"); } else if (!(ictx instanceof MarshallingContext)) { throw new JiBXException("Invalid object type for marshaller"); } else { // start by generating start tag for container MarshallingContext ctx = (MarshallingContext)ictx; HashMap map = (HashMap)obj; ctx.startTagAttributes(m_index, m_name). attribute(m_index, SIZE_ATTRIBUTE_NAME, map.size()). closeStartContent(); // loop through all entries in hashmap Iterator iter = map.entrySet().iterator(); while (iter.hasNext()) { Map.Entry entry = (Map.Entry)iter.next(); ctx.startTagAttributes(m_index, ENTRY_ELEMENT_NAME); if (entry.getKey() != null) { ctx.attribute(m_index, KEY_ATTRIBUTE_NAME, entry.getKey().toString()); } ctx.closeStartContent(); if (entry.getValue() instanceof IMarshallable) { ((IMarshallable)entry.getValue()).marshal(ctx); ctx.endTag(m_index, ENTRY_ELEMENT_NAME); } else { throw new JiBXException("Mapped value is not marshallable"); } } // finish with end tag for container element ctx.endTag(m_index, m_name); } } /* (non-Javadoc) * @see org.jibx.runtime.IUnmarshaller#isPresent(org.jibx.runtime.IUnmarshallingContext) */ public boolean isPresent(IUnmarshallingContext ctx) throws JiBXException { return ctx.isAt(m_uri, m_name); } /* (non-Javadoc) * @see org.jibx.runtime.IUnmarshaller#unmarshal(java.lang.Object, * org.jibx.runtime.IUnmarshallingContext) */ public Object unmarshal(Object obj, IUnmarshallingContext ictx) throws JiBXException { // make sure we're at the appropriate start tag UnmarshallingContext ctx = (UnmarshallingContext)ictx; if (!ctx.isAt(m_uri, m_name)) { ctx.throwStartTagNameError(m_uri, m_name); } // create new hashmap if needed int size = ctx.attributeInt(m_uri, SIZE_ATTRIBUTE_NAME, DEFAULT_SIZE); HashMap map = (HashMap)obj; if (map == null) { map = new HashMap(size); } // process all entries present in document ctx.parsePastStartTag(m_uri, m_name); while (ctx.isAt(m_uri, ENTRY_ELEMENT_NAME)) { Object key = ctx.attributeText(m_uri, KEY_ATTRIBUTE_NAME, null); ctx.parsePastStartTag(m_uri, ENTRY_ELEMENT_NAME); Object value = ctx.unmarshalElement(); map.put(key, value); ctx.parsePastEndTag(m_uri, ENTRY_ELEMENT_NAME); } ctx.parsePastEndTag(m_uri, m_name); return map; } public boolean isExtension(String arg0) { return false; } } ~~~ e) 然后运行Compile命令 E:/Study/WebHttpUtils>java -cp bin;lib/jibx-bind.jar org.jibx.binding.Compile -v bind.xml f) 结果如下 ~~~ <?xml version="1.0" encoding="UTF-8"?> <map-bean> <map size="2"> <entry key="No2"> <account id="2"> <name>tom</name> <email>tom@125.com</email> <address>china</address> <birthday> <birthday>2010-11-22</birthday> </birthday> </account> </entry> <entry key="No1"> <account id="1"> <name>jack</name> <email>email</email> <address>北京</address> <birthday> <birthday>2010-11-22</birthday> </birthday> </account> </entry> </map> </map-bean> {No2=2#tom#tom@125.com#china#2010-11-22, No1=1#jack#email#北京#2010-11-22} 1#jack#email#北京#2010-11-22 2#tom#tom@125.com#china#2010-11-22 ~~~