Jibx handles XML

I have introduced the json-lib framework before, online blog post: http://www.php.cn/

and the Jackson framework, online blog post: http://www.php.cn/

They can all complete the conversion of Java objects to XML, but they are not so perfect yet.

There is also XStream's support for JSON and XML, which can perfectly convert JSON or XML. Online blog:

http://www.php.cn/

and introduce Castor to complete the conversion of Java objects to xml. Online blog: http://www.php.cn/

Jaxb2 completes the conversion of xml, online blog: http://www.php.cn/

Jibx converts Java objects It is relatively more responsible. It not only needs to configure xml but also generate corresponding jar files and xsd files. Let's take a look at how Jibx converts Java to XML.

1. Preparation

1. Preparation of resources

a) Official example: http://www.php .cn/

http://www.php.cn/

b) Jar download: http://www.php.cn/

c) Depend on jar The package is as follows:

2. Program preparation code

##

package com.hoo.test;

 <br>

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;

 <br>

/**

 * 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://www.php.cn/

 * @email hoojo_@126.com

 * @version 1.0

 */

public class JibxTest {

    private IBindingFactory factory = null;

    <br>

    private StringWriter writer = null;

    private StringReader reader = null;

    <br>

    private Account bean = null;

    <br>

    @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);

        <br>

        try {

            factory = BindingDirectory.getFactory(Account.class);

        } catch (JiBXException e) {

            e.printStackTrace();

        }

    }

    <br>

    @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();

    }

    <br>

    public void fail(Object o) {

        System.out.println(o);

    }

    <br>

    public void failRed(Object o) {

        System.err.println(o);

    }

}

##IBindingFactory is a factory interface, through the getFactory of BindingDirectory Factory methods can obtain an object. Then through this project, the context for converting the xml document can be obtained.

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);

        <br/>

        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：

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：

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();

        Listlist = 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);

        <br/>

        list.add(bean);

        listBean.setList(list);

        <br/>

        <br/>

        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);

        <br/>

        reader = new StringReader(writer.toString());

        //unmarshal 解组

        IUnmarshallingContext uctx = factory.createUnmarshallingContext();

        listBean = (ListBean) uctx.unmarshalDocument(reader, null);

        <br/>

        fail(listBean.getList().get(0));

        fail(listBean.getList().get(1));

    } catch (Exception e) {

        e.printStackTrace();

    }

}

b) ListBean代码

package com.hoo.entity;

 <br/>

import java.util.List;

 <br/>

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：

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

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;

 <br/>

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

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();
   
        HashMapmap = 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;

 <br/>

import java.util.HashMap;

 <br/>

public class MapBean {

    private HashMapmap;

    <br/>

    public HashMapgetMap() {

        return map;

    }

    public void setMap(HashMapmap) {

        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.php.cn/ 
 * @file HashMapper.java
 * @package com.hoo.util   
 * @project WebHttpUtils   
 * @blog http://www.php.cn/   
 * @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

  

{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
顶

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