java JAXB 学习

JAXB（Java Architecture for XML Binding)是JDK的一部分，用于Object <-> XML的转换（有点类似于.NET中的XML序列化）。

1、创建XSD

可以使用任何工具生成XSD工具，比如XMLSPY。eclipse也提供了相关的jaxb插件，File -> New -> XML Schema File

文件命名为order.xsd，eclipse中也提供了xsd可视化编辑工具

当然，你要是很NB，对xsd结构倒背如流的话，完全也可以纯手写。

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!-- edited with XMLSpy v2013 (http://www.altova.com) by  () -->
 3 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
 4     <xs:element name="Order">
 5         <xs:annotation>
 6             <xs:documentation>Comment describing your root element</xs:documentation>
 7         </xs:annotation>
 8         <xs:complexType>
 9             <xs:sequence>
10                 <xs:element name="OrderNo" type="xs:string"/>
11                 <xs:element name="OrderDateTime" type="xs:dateTime"/>
12                 <xs:element name="CustomerName" type="xs:string"/>
13                 <xs:element name="OrderItems">
14                     <xs:complexType>
15                         <xs:sequence>
16                             <xs:element name="Produdct" maxOccurs="unbounded">
17                                 <xs:complexType>
18                                     <xs:sequence>
19                                         <xs:element name="ProductNo" type="xs:string"/>
20                                         <xs:element name="ProductName" type="xs:string"/>
21                                         <xs:element name="Price" type="xs:float"/>
22                                         <xs:element name="Amount" type="xs:int"/>
23                                     </xs:sequence>
24                                 </xs:complexType>
25                             </xs:element>
26                         </xs:sequence>
27                     </xs:complexType>
28                 </xs:element>
29             </xs:sequence>
30         </xs:complexType>
31     </xs:element>
32 </xs:schema>

上面是Order.xsd的内容

2、根据XSD生成示例Xml

在XSD文件上右击 -> Generate -> XmlFile

会弹出一个框：

Prefix这里，如果不需要，可以参考上图自行清空，如果一些可选节点也需要生成示例数据，上图中的Create optional attributes、Create optional elements这二项也勾选上。

生成的order.xml内容如下：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!--Sample XML file generated by XMLSpy v2013 (http://www.altova.com)-->
 3 <Order xsi:noNamespaceSchemaLocation="order.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 4     <OrderNo>0000001</OrderNo>
 5     <OrderDateTime>2001-12-17T09:30:47Z</OrderDateTime>
 6     <CustomerName>jimmy</CustomerName>
 7     <OrderItems>
 8         <Produdct>
 9             <ProductNo>P-01</ProductNo>
10             <ProductName>Book</ProductName>
11             <Price>1.14159E0</Price>
12             <Amount>1</Amount>
13         </Produdct>
14         <Produdct>
15             <ProductNo>P-02</ProductNo>
16             <ProductName>iPhone 5C</ProductName>
17             <Price>3.14159E0</Price>
18             <Amount>2</Amount>
19         </Produdct>
20     </OrderItems>
21 </Order>

3、根据xsd生成java类

同样在xsd上右击 -> Generate -> JAXB Classes... 剩下的事情，大家都知道了

  1 //
  2 // This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, vJAXB 2.1.10 in JDK 6 
  3 // See <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a> 
  4 // Any modifications to this file will be lost upon recompilation of the source schema. 
  5 // Generated on: 2014.01.24 at 11:09:15 ���� CST 
  6 //
  7 
  8 
  9 package model;
 10 
 11 import java.util.ArrayList;
 12 import java.util.List;
 13 import javax.xml.bind.annotation.XmlAccessType;
 14 import javax.xml.bind.annotation.XmlAccessorType;
 15 import javax.xml.bind.annotation.XmlElement;
 16 import javax.xml.bind.annotation.XmlRootElement;
 17 import javax.xml.bind.annotation.XmlSchemaType;
 18 import javax.xml.bind.annotation.XmlType;
 19 import javax.xml.datatype.XMLGregorianCalendar;
 20 
 21 
 22 /**
 23  * <p>Java class for anonymous complex type.
 24  * 
 25  * <p>The following schema fragment specifies the expected content contained within this class.
 26  * 
 27  * <pre>
 28  * &lt;complexType>
 29  *   &lt;complexContent>
 30  *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 31  *       &lt;sequence>
 32  *         &lt;element name="OrderNo" type="{http://www.w3.org/2001/XMLSchema}string"/>
 33  *         &lt;element name="OrderDateTime" type="{http://www.w3.org/2001/XMLSchema}dateTime"/>
 34  *         &lt;element name="CustomerName" type="{http://www.w3.org/2001/XMLSchema}string"/>
 35  *         &lt;element name="OrderItems">
 36  *           &lt;complexType>
 37  *             &lt;complexContent>
 38  *               &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 39  *                 &lt;sequence>
 40  *                   &lt;element name="Produdct" maxOccurs="unbounded">
 41  *                     &lt;complexType>
 42  *                       &lt;complexContent>
 43  *                         &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 44  *                           &lt;sequence>
 45  *                             &lt;element name="ProductNo" type="{http://www.w3.org/2001/XMLSchema}string"/>
 46  *                             &lt;element name="ProductName" type="{http://www.w3.org/2001/XMLSchema}string"/>
 47  *                             &lt;element name="Price" type="{http://www.w3.org/2001/XMLSchema}float"/>
 48  *                             &lt;element name="Amount" type="{http://www.w3.org/2001/XMLSchema}int"/>
 49  *                           &lt;/sequence>
 50  *                         &lt;/restriction>
 51  *                       &lt;/complexContent>
 52  *                     &lt;/complexType>
 53  *                   &lt;/element>
 54  *                 &lt;/sequence>
 55  *               &lt;/restriction>
 56  *             &lt;/complexContent>
 57  *           &lt;/complexType>
 58  *         &lt;/element>
 59  *       &lt;/sequence>
 60  *     &lt;/restriction>
 61  *   &lt;/complexContent>
 62  * &lt;/complexType>
 63  * </pre>
 64  * 
 65  * 
 66  */
 67 @XmlAccessorType(XmlAccessType.FIELD)
 68 @XmlType(name = "", propOrder = {
 69     "orderNo",
 70     "orderDateTime",
 71     "customerName",
 72     "orderItems"
 73 })
 74 @XmlRootElement(name = "Order")
 75 public class Order {
 76 
 77     @XmlElement(name = "OrderNo", required = true)
 78     protected String orderNo;
 79     @XmlElement(name = "OrderDateTime", required = true)
 80     @XmlSchemaType(name = "dateTime")
 81     protected XMLGregorianCalendar orderDateTime;
 82     @XmlElement(name = "CustomerName", required = true)
 83     protected String customerName;
 84     @XmlElement(name = "OrderItems", required = true)
 85     protected Order.OrderItems orderItems;
 86 
 87     /**
 88      * Gets the value of the orderNo property.
 89      * 
 90      * @return
 91      *     possible object is
 92      *     {@link String }
 93      *     
 94      */
 95     public String getOrderNo() {
 96         return orderNo;
 97     }
 98 
 99     /**
100      * Sets the value of the orderNo property.
101      * 
102      * @param value
103      *     allowed object is
104      *     {@link String }
105      *     
106      */
107     public void setOrderNo(String value) {
108         this.orderNo = value;
109     }
110 
111     /**
112      * Gets the value of the orderDateTime property.
113      * 
114      * @return
115      *     possible object is
116      *     {@link XMLGregorianCalendar }
117      *     
118      */
119     public XMLGregorianCalendar getOrderDateTime() {
120         return orderDateTime;
121     }
122 
123     /**
124      * Sets the value of the orderDateTime property.
125      * 
126      * @param value
127      *     allowed object is
128      *     {@link XMLGregorianCalendar }
129      *     
130      */
131     public void setOrderDateTime(XMLGregorianCalendar value) {
132         this.orderDateTime = value;
133     }
134 
135     /**
136      * Gets the value of the customerName property.
137      * 
138      * @return
139      *     possible object is
140      *     {@link String }
141      *     
142      */
143     public String getCustomerName() {
144         return customerName;
145     }
146 
147     /**
148      * Sets the value of the customerName property.
149      * 
150      * @param value
151      *     allowed object is
152      *     {@link String }
153      *     
154      */
155     public void setCustomerName(String value) {
156         this.customerName = value;
157     }
158 
159     /**
160      * Gets the value of the orderItems property.
161      * 
162      * @return
163      *     possible object is
164      *     {@link Order.OrderItems }
165      *     
166      */
167     public Order.OrderItems getOrderItems() {
168         return orderItems;
169     }
170 
171     /**
172      * Sets the value of the orderItems property.
173      * 
174      * @param value
175      *     allowed object is
176      *     {@link Order.OrderItems }
177      *     
178      */
179     public void setOrderItems(Order.OrderItems value) {
180         this.orderItems = value;
181     }
182 
183 
184     /**
185      * <p>Java class for anonymous complex type.
186      * 
187      * <p>The following schema fragment specifies the expected content contained within this class.
188      * 
189      * <pre>
190      * &lt;complexType>
191      *   &lt;complexContent>
192      *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
193      *       &lt;sequence>
194      *         &lt;element name="Produdct" maxOccurs="unbounded">
195      *           &lt;complexType>
196      *             &lt;complexContent>
197      *               &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
198      *                 &lt;sequence>
199      *                   &lt;element name="ProductNo" type="{http://www.w3.org/2001/XMLSchema}string"/>
200      *                   &lt;element name="ProductName" type="{http://www.w3.org/2001/XMLSchema}string"/>
201      *                   &lt;element name="Price" type="{http://www.w3.org/2001/XMLSchema}float"/>
202      *                   &lt;element name="Amount" type="{http://www.w3.org/2001/XMLSchema}int"/>
203      *                 &lt;/sequence>
204      *               &lt;/restriction>
205      *             &lt;/complexContent>
206      *           &lt;/complexType>
207      *         &lt;/element>
208      *       &lt;/sequence>
209      *     &lt;/restriction>
210      *   &lt;/complexContent>
211      * &lt;/complexType>
212      * </pre>
213      * 
214      * 
215      */
216     @XmlAccessorType(XmlAccessType.FIELD)
217     @XmlType(name = "", propOrder = {
218         "produdct"
219     })
220     public static class OrderItems {
221 
222         @XmlElement(name = "Produdct", required = true)
223         protected List<Order.OrderItems.Produdct> produdct;
224 
225         /**
226          * Gets the value of the produdct property.
227          * 
228          * <p>
229          * This accessor method returns a reference to the live list,
230          * not a snapshot. Therefore any modification you make to the
231          * returned list will be present inside the JAXB object.
232          * This is why there is not a <CODE>set</CODE> method for the produdct property.
233          * 
234          * <p>
235          * For example, to add a new item, do as follows:
236          * <pre>
237          *    getProdudct().add(newItem);
238          * </pre>
239          * 
240          * 
241          * <p>
242          * Objects of the following type(s) are allowed in the list
243          * {@link Order.OrderItems.Produdct }
244          * 
245          * 
246          */
247         public List<Order.OrderItems.Produdct> getProdudct() {
248             if (produdct == null) {
249                 produdct = new ArrayList<Order.OrderItems.Produdct>();
250             }
251             return this.produdct;
252         }
253 
254 
255         /**
256          * <p>Java class for anonymous complex type.
257          * 
258          * <p>The following schema fragment specifies the expected content contained within this class.
259          * 
260          * <pre>
261          * &lt;complexType>
262          *   &lt;complexContent>
263          *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
264          *       &lt;sequence>
265          *         &lt;element name="ProductNo" type="{http://www.w3.org/2001/XMLSchema}string"/>
266          *         &lt;element name="ProductName" type="{http://www.w3.org/2001/XMLSchema}string"/>
267          *         &lt;element name="Price" type="{http://www.w3.org/2001/XMLSchema}float"/>
268          *         &lt;element name="Amount" type="{http://www.w3.org/2001/XMLSchema}int"/>
269          *       &lt;/sequence>
270          *     &lt;/restriction>
271          *   &lt;/complexContent>
272          * &lt;/complexType>
273          * </pre>
274          * 
275          * 
276          */
277         @XmlAccessorType(XmlAccessType.FIELD)
278         @XmlType(name = "", propOrder = {
279             "productNo",
280             "productName",
281             "price",
282             "amount"
283         })
284         public static class Produdct {
285 
286             @XmlElement(name = "ProductNo", required = true)
287             protected String productNo;
288             @XmlElement(name = "ProductName", required = true)
289             protected String productName;
290             @XmlElement(name = "Price")
291             protected float price;
292             @XmlElement(name = "Amount")
293             protected int amount;
294 
295             /**
296              * Gets the value of the productNo property.
297              * 
298              * @return
299              *     possible object is
300              *     {@link String }
301              *     
302              */
303             public String getProductNo() {
304                 return productNo;
305             }
306 
307             /**
308              * Sets the value of the productNo property.
309              * 
310              * @param value
311              *     allowed object is
312              *     {@link String }
313              *     
314              */
315             public void setProductNo(String value) {
316                 this.productNo = value;
317             }
318 
319             /**
320              * Gets the value of the productName property.
321              * 
322              * @return
323              *     possible object is
324              *     {@link String }
325              *     
326              */
327             public String getProductName() {
328                 return productName;
329             }
330 
331             /**
332              * Sets the value of the productName property.
333              * 
334              * @param value
335              *     allowed object is
336              *     {@link String }
337              *     
338              */
339             public void setProductName(String value) {
340                 this.productName = value;
341             }
342 
343             /**
344              * Gets the value of the price property.
345              * 
346              */
347             public float getPrice() {
348                 return price;
349             }
350 
351             /**
352              * Sets the value of the price property.
353              * 
354              */
355             public void setPrice(float value) {
356                 this.price = value;
357             }
358 
359             /**
360              * Gets the value of the amount property.
361              * 
362              */
363             public int getAmount() {
364                 return amount;
365             }
366 
367             /**
368              * Sets the value of the amount property.
369              * 
370              */
371             public void setAmount(int value) {
372                 this.amount = value;
373             }
374 
375         }
376 
377     }
378 
379 }

上面是根据刚才的order.xsd生成的order类，package名称是model（当然生成java class的时候，你可以根据实际情况，设成任何自己需要的package名）

同时还会生成一个ObjectFactory类：

 1 //
 2 // This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, vJAXB 2.1.10 in JDK 6 
 3 // See <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a> 
 4 // Any modifications to this file will be lost upon recompilation of the source schema. 
 5 // Generated on: 2014.01.24 at 11:09:15 ���� CST 
 6 //
 7 
 8 
 9 package model;
10 
11 import javax.xml.bind.annotation.XmlRegistry;
12 
13 
14 /**
15  * This object contains factory methods for each 
16  * Java content interface and Java element interface 
17  * generated in the model package. 
18  * <p>An ObjectFactory allows you to programatically 
19  * construct new instances of the Java representation 
20  * for XML content. The Java representation of XML 
21  * content can consist of schema derived interfaces 
22  * and classes representing the binding of schema 
23  * type definitions, element declarations and model 
24  * groups.  Factory methods for each of these are 
25  * provided in this class.
26  * 
27  */
28 @XmlRegistry
29 public class ObjectFactory {
30 
31 
32     /**
33      * Create a new ObjectFactory that can be used to create new instances of schema derived classes for package: model
34      * 
35      */
36     public ObjectFactory() {
37     }
38 
39     /**
40      * Create an instance of {@link Order.OrderItems }
41      * 
42      */
43     public Order.OrderItems createOrderOrderItems() {
44         return new Order.OrderItems();
45     }
46 
47     /**
48      * Create an instance of {@link Order }
49      * 
50      */
51     public Order createOrder() {
52         return new Order();
53     }
54 
55     /**
56      * Create an instance of {@link Order.OrderItems.Produdct }
57      * 
58      */
59     public Order.OrderItems.Produdct createOrderOrderItemsProdudct() {
60         return new Order.OrderItems.Produdct();
61     }
62 
63 }

4、Object <-> XML 的示例代码

 1     public void testXmlToObj() {
 2         JAXBContext jc;
 3         try {
 4             jc = JAXBContext.newInstance("model");
 5             Unmarshaller u = jc.createUnmarshaller();
 6             String xmlFilePath = AppTest.class.getResource("/").getPath()
 7                     + "order.xml";
 8             System.out.println(xmlFilePath);
 9             Order order = (Order) u.unmarshal(new File(xmlFilePath));
10             assertTrue(order.getOrderNo().equals("0000001"));
11             assertTrue(order.getCustomerName().equals("jimmy"));
12             for (int i = 0; i < order.getOrderItems().getProdudct().size(); i++) {
13                 System.out.println(getProductDesc(order.getOrderItems()
14                         .getProdudct().get(i)));
15             }
16         } catch (Exception e) {
17             e.printStackTrace();
18         }
19     }
20 
21     public void testObjToXml() {
22         try {
23             ObjectFactory of = new ObjectFactory();
24             Order order = of.createOrder();
25             Order.OrderItems orderItems = of.createOrderOrderItems();
26             
27             Order.OrderItems.Produdct product1 = new Order.OrderItems.Produdct();
28             product1.setProductNo("A-01");
29             product1.setProductName("Car");
30             product1.setPrice(1000000);
31             product1.setAmount(1);
32             
33             orderItems.getProdudct().add(product1);
34             
35             Order.OrderItems.Produdct product2 = new Order.OrderItems.Produdct();
36             product2.setProductNo("B-01");
37             product2.setProductName("Book");
38             product2.setPrice(200);
39             product2.setAmount(2);
40             
41             orderItems.getProdudct().add(product2);
42         
43             order.setOrderItems(orderItems);
44 
45             JAXBContext jc = JAXBContext.newInstance("model");
46             Marshaller ms = jc.createMarshaller();
47             ms.setProperty("jaxb.encoding", "UTF-8");
48             ms.setProperty("jaxb.formatted.output", true);
49             String xmlFilePath = AppTest.class.getResource("/").getPath()
50                     + "order_new.xml";
51             ms.marshal(order, new File(xmlFilePath));
52             
53             System.out.println("testObjToXml");
54         } catch (Exception e) {
55             e.printStackTrace();
56 
57         }
58     }

示例源代码下载：jaxb-helloworld.zip (注：这是一个maven工程，命令行下直接mvn clean test，就可以测试)