JAXB: XML 与 Java之间的映射 （OXM）

在JAVA EE 56中，jaxb可以很方便的与jax-rs、jax-ws集成，极大的简化了web service接口的开发工作量。

三、需要的JAR包：eclipselink

你需要在eclipse中你的项目中引入支持jaxb的jar包，目前的eclipselink2.5.2 or 2.6.x都支持它，下载page如下

https://www.eclipse.org/eclipselink/downloads/previous_releases.php

或者利用"eclipse marketplace" or "install new software" 去自动安装即可。

而且这个jar可以支持JPA等，不错的工具。

jaxb代码举例
第一步：需要引入eclipselink等支持JAXB的包
第二步：编写java bean;

importjava.io.File;
1. importjavax.xml.bind.JAXBContext;
2. importjavax.xml.bind.JAXBException;
3. importjavax.xml.bind.Marshaller;
4. classJAXBExample{
5. staticvoidmain(String[]args){
6. Customercustomer=newCustomer();
7. customer.setId(100);
8. customer.setName("mkyong");
9. customer.setAge(29);
10. try{
11. Filefile=newFile("C:file.xml");
12. JAXBContextjaxbContext=JAXBContext.newInstance(Customer.class);
13. MarshallerjaxbMarshaller=jaxbContext.createMarshaller();
14. //outputprettyprinted
15. jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,true);
16. jaxbMarshaller.marshal(customer,file);
17. jaxbMarshaller.marshal(customer,System.out);
18. }catch(JAXBExceptione){
19. e.printStackTrace();
20. }

<?xmlversion="1.0"encoding="UTF-8"standalone="yes"?>
1. <customerid="100">
2. age>29</>
3. name>mkyongcustomer>

jdk提供了xjc工具可以使xsd自动生成相应的java bean，这大大提高了开发的效率。同时，我们也可以使用trang.jar把xml轻松转化为xsd。下面是使用的举例。

第一步：把数据库表映射为xml

xmlversion="1.0"encoding="UTF-8"Useru_id="1"u_name="moto"u_email="aaa@XXX.com"
1. u_mood="今天放假了"u_state="online"u_mobile="12345678901"
2. u_hometown="山西"u_job="IT软件工程师"u_avatar="w34353453543r53"/>

java-jarD:libtrang.jaruser.xmluser.xsd

//
1. //ThisfilewasgeneratedbytheJavaTMArchitectureforXMLBinding(JAXB)ReferenceImplementation,vJAXB2.1.10inJDK6
2. //See<ahref="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a>
3. //Anymodificationstothisfilewillbelostuponrecompilationofthesourceschema.
4. //Generatedon:2011.11.13at01:26:07????CST
5. //
6. packagecom.moto.server.bean;
7. importjava.math.BigInteger;
8. importjavax.xml.bind.annotation.XmlAccessType;
9. importjavax.xml.bind.annotation.XmlAccessorType;
10. importjavax.xml.bind.annotation.XmlAttribute;
11. importjavax.xml.bind.annotation.XmlSchemaType;
12. importjavax.xml.bind.annotation.XmlType;
13. importjavax.xml.bind.annotation.adapters.CollapsedStringAdapter;
14. importjavax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
15. /**
16. *<p>Javaclassforanonymouscomplextype.
17. *
18. *<p>Thefollowingschemafragmentspecifiestheexpectedcontentcontainedwithinthisclass.
19. *<pre>
20. *<complexType>
21. *<complexContent>
22. *<restrictionbase="{http://www.w3.org/2001/XMLSchema}anyType">
23. *<attributename="u_avatar"use="required"type="{http://www.w3.org/2001/XMLSchema}NCName"/>
24. *<attributename="u_email"use="required"type="{http://www.w3.org/2001/XMLSchema}anySimpleType"/>
25. *<attributename="u_hometown"use="required"type="{http://www.w3.org/2001/XMLSchema}NCName"/>
26. *<attributename="u_id"use="required"type="{http://www.w3.org/2001/XMLSchema}integer"/>
27. *<attributename="u_job"use="required"type="{http://www.w3.org/2001/XMLSchema}NCName"/>
28. *<attributename="u_mobile"use="required"type="{http://www.w3.org/2001/XMLSchema}integer"/>
29. *<attributename="u_mood"use="required"type="{http://www.w3.org/2001/XMLSchema}NCName"/>
30. *<attributename="u_name"use="required"type="{http://www.w3.org/2001/XMLSchema}NCName"/>
31. *<attributename="u_state"use="required"type="{http://www.w3.org/2001/XMLSchema}NCName"/>
32. *</restriction>
33. *</complexContent>
34. *</complexType>
35. *</pre>
36. *
37. */
38. @XmlAccessorType(XmlAccessType.FIELD)
39. @XmlType(name="")
40. @XmlRootElement(name="User")
41. classUser{
42. @XmlAttribute(name="u_avatar",required=true)
43. @XmlJavaTypeAdapter(CollapsedStringAdapter.class)
44. @XmlSchemaType(name="NCName")
45. protectedStringuAvatar;
46. @XmlAttribute(name="u_email",100); background-color:inherit">@XmlSchemaType(name="anySimpleType")
47. protectedStringuEmail;
48. @XmlAttribute(name="u_hometown",153); font-weight:bold; background-color:inherit">true)
49. class)
50. @XmlSchemaType(name="NCName")
51. protectedStringuHometown;
52. @XmlAttribute(name="u_id",153); font-weight:bold; background-color:inherit">protectedBigIntegeruId;
53. @XmlAttribute(name="u_job",153); font-weight:bold; background-color:inherit">protectedStringuJob;
54. @XmlAttribute(name="u_mobile",153); font-weight:bold; background-color:inherit">protectedBigIntegeruMobile;
55. @XmlAttribute(name="u_mood",153); font-weight:bold; background-color:inherit">protectedStringuMood;
56. @XmlAttribute(name="u_name",153); font-weight:bold; background-color:inherit">protectedStringuName;
57. @XmlAttribute(name="u_state",153); font-weight:bold; background-color:inherit">protectedStringuState;
58. *GetsthevalueoftheuAvatarproperty.
59. *@return
60. *possibleobjectis
61. *{@linkString}
62. */
63. publicStringgetUAvatar(){
64. returnuAvatar;
65. *SetsthevalueoftheuAvatarproperty.
66. *@paramvalue
67. *allowedobjectis
68. voidsetUAvatar(Stringvalue){
69. this.uAvatar=value;
70. *GetsthevalueoftheuEmailproperty.
71. publicStringgetUEmail(){
72. returnuEmail;
73. *SetsthevalueoftheuEmailproperty.
74. voidsetUEmail(Stringvalue){
75. this.uEmail=value;
76. *GetsthevalueoftheuHometownproperty.
77. publicStringgetUHometown(){
78. returnuHometown;
79. *SetsthevalueoftheuHometownproperty.
80. voidsetUHometown(Stringvalue){
81. this.uHometown=value;
82. *GetsthevalueoftheuIdproperty.
83. *{@linkBigInteger}
84. publicBigIntegergetUId(){
85. returnuId;
86. *SetsthevalueoftheuIdproperty.
87. voidsetUId(BigIntegervalue){
88. this.uId=value;
89. *GetsthevalueoftheuJobproperty.
90. publicStringgetUJob(){
91. returnuJob;
92. *SetsthevalueoftheuJobproperty.
93. voidsetUJob(Stringvalue){
94. this.uJob=value;
95. *GetsthevalueoftheuMobileproperty.
96. publicBigIntegergetUMobile(){
97. returnuMobile;
98. *SetsthevalueoftheuMobileproperty.
99. voidsetUMobile(BigIntegervalue){
100. this.uMobile=value;
101. *GetsthevalueoftheuMoodproperty.
102. publicStringgetUMood(){
103. returnuMood;
104. *SetsthevalueoftheuMoodproperty.
105. voidsetUMood(Stringvalue){
106. this.uMood=value;
107. *GetsthevalueoftheuNameproperty.
108. publicStringgetUName(){
109. returnuName;
110. *SetsthevalueoftheuNameproperty.
111. voidsetUName(Stringvalue){
112. this.uName=value;
113. *GetsthevalueoftheuStateproperty.
114. publicStringgetUState(){
115. returnuState;
116. *SetsthevalueoftheuStateproperty.
117. voidsetUState(Stringvalue){
118. this.uState=value;
119. }

另外也可以利用eclipse的jaxb项目自己的菜单功能也可以根据 java class自动生成xsd文件，如下图

（编辑：李大同）

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