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本篇內容介紹了“Jibx轉換Java到XML是如何完成”的有關知識,在實際案例的操作過程中,不少人都會遇到這樣的困境,接下來就讓小編帶領大家學習一下如何處理這些情況吧!希望大家仔細閱讀,能夠學有所成!
Jibx對Java對象的轉換相對要負責些,它不僅需要配置xml還且還要生成相應的jar文件,已經xsd文件。下面我們就來慢慢看看的。
一、 準備工作
1、 準備資源
a) 官方示例:http://www.php.cn/
http://www.php.cn/
b) Jar下載:http://www.php.cn/
c) 依賴jar包如下:
2、 程序準備代碼
package com.hoo.test;
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import java.io.IOException;
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import java.io.StringReader;
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import java.io.StringWriter;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import org.jibx.runtime.BindingDirectory;
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import org.jibx.runtime.IBindingFactory;
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import org.jibx.runtime.IMarshallingContext;
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import org.jibx.runtime.IUnmarshallingContext;
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import org.jibx.runtime.JiBXException;
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import org.junit.After;
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import org.junit.Before;
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import org.junit.Test;
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import com.hoo.entity.Account;
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import com.hoo.entity.AccountArray;
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import com.hoo.entity.Birthday;
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import com.hoo.entity.ListBean;
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import com.hoo.entity.MapBean;
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/**
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* function: Jibx轉換Java到XML
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* @author hoojo
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* @createDate 2011-4-25 下午06:47:33
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* @file JibxTest.java
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* @package com.hoo.test
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* @project WebHttpUtils
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* @blog http://www.php.cn/
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* @email hoojo_@126.com
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* @version 1.0
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*/
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public class JibxTest {
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private IBindingFactory factory = null;
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private StringWriter writer = null;
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private StringReader reader = null;
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private Account bean = null;
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@Before
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public void init() {
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bean = new Account();
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bean.setAddress("北京");
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bean.setEmail("email");
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bean.setId(1);
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bean.setName("jack");
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Birthday day = new Birthday();
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day.setBirthday("2010-11-22");
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bean.setBirthday(day);
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try {
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factory = BindingDirectory.getFactory(Account.class);
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} catch (JiBXException e) {
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e.printStackTrace();
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}
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}
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@After
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public void destory() {
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bean = null;
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try {
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if (writer != null) {
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writer.flush();
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writer.close();
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}
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if (reader != null) {
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reader.close();
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}
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} catch (IOException e) {
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e.printStackTrace();
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}
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System.gc();
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}
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public void fail(Object o) {
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System.out.println(o);
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}
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public void failRed(Object o) {
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System.err.println(o);
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}
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}
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IBindingFactory是一個工廠接口,通過BindingDirectory的getFactory工廠方法可以獲得某個對象。然后通過這個工程可以獲得轉換xml文檔的上下文。
二、 轉換Java到XML、轉換XML到Java
1、 轉換JavaEntity對象
a) 首先看看Account、Birthday的代碼
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; } }
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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; } }
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b) 程序代碼
@Test
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public void bean2XML() {
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try {
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writer = new StringWriter();
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// marshal 編組
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IMarshallingContext mctx = factory.createMarshallingContext();
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mctx.setIndent(2);
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mctx.marshalDocument(bean, "UTF-8", null, writer);
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fail(writer);
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reader = new StringReader(writer.toString());
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//unmarshal 解組
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IUnmarshallingContext uctx = factory.createUnmarshallingContext();
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Account acc = (Account) uctx.unmarshalDocument(reader, null);
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fail(acc);
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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這樣還不夠,復雜的東西還在后面。Jibx轉換XML文檔還要經過一系列復雜的程序。
c) 首先,要寫bind.xml和schema。不過還好,官方有提高工具類可以用。
org.jibx.binding.generator.BindGen或org.jibx.binding.BindingGenerator這兩個類都可以,用法如下:
首先用dos進入當前工程目錄,然后執行命令: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 是運行某個程序 –cp是依賴的classpath路徑的jar、zip等文件,-b 是輸出文件名稱,是BindGen類的參數。這樣會在當前工程目錄中生成bind.xml和entity.xsd文件。先看看這2個文件
bind.xml
?xml version="1.0" encoding="UTF-8"?>
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binding value-style="attribute">
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mapping class="com.hoo.entity.Account" name="account">
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value name="id" field="id"/>
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value style="element" name="name" field="name" usage="optional"/>
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value style="element" name="email" field="email" usage="optional"/>
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value style="element" name="address" field="address" usage="optional"/>
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structure field="birthday" usage="optional" name="birthday">
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value style="element" name="birthday" field="birthday" usage="optional"/>
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/structure>
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/mapping>
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/binding>
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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>
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上面最重要的就是bind.xml文件了,下面編譯的時候需要這個文件。Xsd文件可以根據這個文件的內容生成Java的Entity類代碼。
執行完命令后,沒有錯誤就可以運行下面一段命令了。運行命令:
E:/Study/WebHttpUtils>java -cp bin;lib/jibx-bind.jar org.jibx.binding.Compile -v bind.xml
-v是綁定文件的名稱
運行后,有如下結果:
d) 然后你就可以運行上面的Java的Junit測試程序了,運行后結果如下:
?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
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你還可以用命令來查看某個已經生成bind、schema文件的信息,如:
java -cp bin;lib/jibx-run.jar org.jibx.runtime.PrintInfo -c com.hoo.entity.Account
結果如下:
e) 注意,有時候會出現異常信息,如:java.lang.NoSuchFieldException: JiBX_bindingXXXX就要重復下面的命令就可以了。
java -cp bin;lib/jibx-bind.jar org.jibx.binding.Compile -v bind.xml
2、 轉換帶List集合屬性的JavaBean
a) 程序代碼
@Test
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public void listBean2XML() {
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try {
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ListBean listBean = new ListBean();
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Listlist = new ArrayList();
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list.add(bean);
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bean = new Account();
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bean.setAddress("china");
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bean.setEmail("tom@125.com");
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bean.setId(2);
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bean.setName("tom");
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Birthday day = new Birthday("2010-11-22");
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bean.setBirthday(day);
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list.add(bean);
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listBean.setList(list);
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writer = new StringWriter();
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factory = BindingDirectory.getFactory(ListBean.class);
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// marshal 編組
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IMarshallingContext mctx = factory.createMarshallingContext();
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mctx.setIndent(2);
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mctx.marshalDocument(listBean, "UTF-8", null, writer);
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fail(writer);
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reader = new StringReader(writer.toString());
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//unmarshal 解組
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IUnmarshallingContext uctx = factory.createUnmarshallingContext();
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listBean = (ListBean) uctx.unmarshalDocument(reader, null);
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fail(listBean.getList().get(0));
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fail(listBean.getList().get(1));
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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b) ListBean代碼
package com.hoo.entity;
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import java.util.List;
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public class ListBean {
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private String name;
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private List list;
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}
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c) 生成bind.xml
執行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
輸出:
d) 執行完后會生產bind.xml
Bind文件
?xml version="1.0" encoding="UTF-8"?>
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binding value-style="attribute">
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mapping class="com.hoo.entity.ListBean" name="list-bean">
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value style="element" name="name" field="name" usage="optional"/>
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collection field="list" usage="optional" factory="org.jibx.runtime.Utility.arrayListFactory"/>
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/mapping>
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/binding>
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e) 運行Compile工具類
在運行前,一定要將最先前運行的Account那個類的bind.xml文件的內容加入到現在這個bind.xml中,因為ListBean依賴了Account這個類。
命令如下:
java -cp bin;lib/jibx-bind.jar org.jibx.binding.Compile -v bind.xml
運行后你可以看到最后出現這個
f) 運行Test程序,結果如下:
?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、 轉換Java對象數組
a) Test程序
/** * function:轉換對象數組 * @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 編組 IMarshallingContext mctx = factory.createMarshallingContext(); mctx.setIndent(2); mctx.marshalDocument(array, "UTF-8", null, writer); fail(writer); reader = new StringReader(writer.toString()); //unmarshal 解組 IUnmarshallingContext uctx = factory.createUnmarshallingContext(); array = (AccountArray) uctx.unmarshalDocument(reader, null); fail(array.getAccounts()[0]); fail(array.getAccounts()[1]); } catch (Exception e) { e.printStackTrace(); } }
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b) AccountArray代碼
package com.hoo.entity;
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public class AccountArray {
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private Account[] accounts;
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private int size;
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public int getSize() {
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size = accounts.length;
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return size;
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}
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public void setSize(int size) {
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this.size = size;
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}
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public Account[] getAccounts() {
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return accounts;
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}
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public void setAccounts(Account[] accounts) {
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this.accounts = accounts;
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}
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}
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c) 運行命令生成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
因為AccountArray依賴Account,所以后面帶2個類
d) 運行Compile命令
java -cp bin;lib/jibx-bind.jar org.jibx.binding.Compile -v bind.xml
e) 執行完后,就可以運行Test程序了,結果如下
?xml version="1.0" encoding="UTF-8"?>
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account-array size="0">
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account id="1">
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name>jack/name>
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email>email/email>
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address>北京/address>
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birthday>
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birthday>2010-11-22/birthday>
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/birthday>
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/account>
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account id="223">
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name>tom/name>
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/account>
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/account-array>
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1#jack#email#北京#2010-11-22
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223#tom#null#null#null
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4、 轉換帶Map結合的JavaEntity對象
a) Test代碼
/** * function:轉換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 編組 IMarshallingContext mctx = factory.createMarshallingContext(); mctx.setIndent(2); mctx.marshalDocument(mapBean, "UTF-8", null, writer); fail(writer); reader = new StringReader(writer.toString()); //unmarshal 解組 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(); } }
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b) MapBean代碼
package com.hoo.entity;
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import java.util.HashMap;
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public class MapBean {
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private HashMapmap;
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public HashMapgetMap() {
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return map;
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}
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public void setMap(HashMapmap) {
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this.map = map;
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}
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}
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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
運行后,會生產bind.xml;修改bind.xml內容如下:
?xml version="1.0" encoding="UTF-8"?>
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binding value-style="attribute">
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mapping class="com.hoo.entity.Account" name="account">
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value name="id" field="id" />
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value style="element" name="name" field="name" usage="optional" />
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value style="element" name="email" field="email" usage="optional" />
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value style="element" name="address" field="address" usage="optional" />
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structure field="birthday" usage="optional" name="birthday">
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value style="element" name="birthday" field="birthday" usage="optional" />
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/structure>
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/mapping>
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mapping class="com.hoo.entity.MapBean" name="map-bean">
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structure field="map" usage="optional" name="map"
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marshaller="com.hoo.util.HashMapper" unmarshaller="com.hoo.util.HashMapper">
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/structure>
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/mapping>
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/binding>
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注意上面的MapBean的structure元素的內容是經過修改的。一定要帶上marshaller或unmarshaller,不然無法轉換HashMap的。
d) HashMapper代碼
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; } }
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e) 然后運行Compile命令
E:/Study/WebHttpUtils>java -cp bin;lib/jibx-bind.jar org.jibx.binding.Compile -v bind.xml
f) 結果如下
<?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 頂
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