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。
<?xml version="1.0" encoding="UTF-8"?>
<!-- edited with XMLSpy v2013 (http://www.altova.com) by () -->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="Order">
<xs:annotation>
<xs:documentation>Comment describing your root element</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:element name="OrderNo" type="xs:string"/>
<xs:element name="OrderDateTime" type="xs:dateTime"/>
<xs:element name="CustomerName" type="xs:string"/>
<xs:element name="OrderItems">
<xs:complexType>
<xs:sequence>
<xs:element name="Produdct" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="ProductNo" type="xs:string"/>
<xs:element name="ProductName" type="xs:string"/>
<xs:element name="Price" type="xs:float"/>
<xs:element name="Amount" type="xs:int"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
Order.xsd
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：
<?xml version="1.0" encoding="UTF-8"?>
<!--Sample XML file generated by XMLSpy v2013 (http://www.altova.com)-->
<Order xsi:noNamespaceSchemaLocation="order.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<OrderNo>0000001</OrderNo>
<OrderDateTime>2001-12-17T09:30:47Z</OrderDateTime>
<CustomerName>jimmy</CustomerName>
<OrderItems>
<Produdct>
<ProductNo>P-01</ProductNo>
<ProductName>Book</ProductName>
<Price>1.14159E0</Price>
<Amount>1</Amount>
</Produdct>
<Produdct>
<ProductNo>P-02</ProductNo>
<ProductName>iPhone 5C</ProductName>
<Price>3.14159E0</Price>
<Amount>2</Amount>
</Produdct>
</OrderItems>
</Order>
Order.xml
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
//
// This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, vJAXB 2.1.10 in JDK 6
// See <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a>
// Any modifications to this file will be lost upon recompilation of the source schema.
// Generated on: 2014.01.24 at 11:09:15 ���� CST
// package model; import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlSchemaType;
import javax.xml.bind.annotation.XmlType;
import javax.xml.datatype.XMLGregorianCalendar; /**
* <p>Java class for anonymous complex type.
*
* <p>The following schema fragment specifies the expected content contained within this class.
*
* <pre>
* <complexType>
* <complexContent>
* <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
* <sequence>
* <element name="OrderNo" type="{http://www.w3.org/2001/XMLSchema}string"/>
* <element name="OrderDateTime" type="{http://www.w3.org/2001/XMLSchema}dateTime"/>
* <element name="CustomerName" type="{http://www.w3.org/2001/XMLSchema}string"/>
* <element name="OrderItems">
* <complexType>
* <complexContent>
* <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
* <sequence>
* <element name="Produdct" maxOccurs="unbounded">
* <complexType>
* <complexContent>
* <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
* <sequence>
* <element name="ProductNo" type="{http://www.w3.org/2001/XMLSchema}string"/>
* <element name="ProductName" type="{http://www.w3.org/2001/XMLSchema}string"/>
* <element name="Price" type="{http://www.w3.org/2001/XMLSchema}float"/>
* <element name="Amount" type="{http://www.w3.org/2001/XMLSchema}int"/>
* </sequence>
* </restriction>
* </complexContent>
* </complexType>
* </element>
* </sequence>
* </restriction>
* </complexContent>
* </complexType>
* </element>
* </sequence>
* </restriction>
* </complexContent>
* </complexType>
* </pre>
*
*
*/
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"orderNo",
"orderDateTime",
"customerName",
"orderItems"
})
@XmlRootElement(name = "Order")
public class Order { @XmlElement(name = "OrderNo", required = true)
protected String orderNo;
@XmlElement(name = "OrderDateTime", required = true)
@XmlSchemaType(name = "dateTime")
protected XMLGregorianCalendar orderDateTime;
@XmlElement(name = "CustomerName", required = true)
protected String customerName;
@XmlElement(name = "OrderItems", required = true)
protected Order.OrderItems orderItems; /**
* Gets the value of the orderNo property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getOrderNo() {
return orderNo;
} /**
* Sets the value of the orderNo property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setOrderNo(String value) {
this.orderNo = value;
} /**
* Gets the value of the orderDateTime property.
*
* @return
* possible object is
* {@link XMLGregorianCalendar }
*
*/
public XMLGregorianCalendar getOrderDateTime() {
return orderDateTime;
} /**
* Sets the value of the orderDateTime property.
*
* @param value
* allowed object is
* {@link XMLGregorianCalendar }
*
*/
public void setOrderDateTime(XMLGregorianCalendar value) {
this.orderDateTime = value;
} /**
* Gets the value of the customerName property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getCustomerName() {
return customerName;
} /**
* Sets the value of the customerName property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setCustomerName(String value) {
this.customerName = value;
} /**
* Gets the value of the orderItems property.
*
* @return
* possible object is
* {@link Order.OrderItems }
*
*/
public Order.OrderItems getOrderItems() {
return orderItems;
} /**
* Sets the value of the orderItems property.
*
* @param value
* allowed object is
* {@link Order.OrderItems }
*
*/
public void setOrderItems(Order.OrderItems value) {
this.orderItems = value;
} /**
* <p>Java class for anonymous complex type.
*
* <p>The following schema fragment specifies the expected content contained within this class.
*
* <pre>
* <complexType>
* <complexContent>
* <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
* <sequence>
* <element name="Produdct" maxOccurs="unbounded">
* <complexType>
* <complexContent>
* <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
* <sequence>
* <element name="ProductNo" type="{http://www.w3.org/2001/XMLSchema}string"/>
* <element name="ProductName" type="{http://www.w3.org/2001/XMLSchema}string"/>
* <element name="Price" type="{http://www.w3.org/2001/XMLSchema}float"/>
* <element name="Amount" type="{http://www.w3.org/2001/XMLSchema}int"/>
* </sequence>
* </restriction>
* </complexContent>
* </complexType>
* </element>
* </sequence>
* </restriction>
* </complexContent>
* </complexType>
* </pre>
*
*
*/
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"produdct"
})
public static class OrderItems { @XmlElement(name = "Produdct", required = true)
protected List<Order.OrderItems.Produdct> produdct; /**
* Gets the value of the produdct property.
*
* <p>
* This accessor method returns a reference to the live list,
* not a snapshot. Therefore any modification you make to the
* returned list will be present inside the JAXB object.
* This is why there is not a <CODE>set</CODE> method for the produdct property.
*
* <p>
* For example, to add a new item, do as follows:
* <pre>
* getProdudct().add(newItem);
* </pre>
*
*
* <p>
* Objects of the following type(s) are allowed in the list
* {@link Order.OrderItems.Produdct }
*
*
*/
public List<Order.OrderItems.Produdct> getProdudct() {
if (produdct == null) {
produdct = new ArrayList<Order.OrderItems.Produdct>();
}
return this.produdct;
} /**
* <p>Java class for anonymous complex type.
*
* <p>The following schema fragment specifies the expected content contained within this class.
*
* <pre>
* <complexType>
* <complexContent>
* <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
* <sequence>
* <element name="ProductNo" type="{http://www.w3.org/2001/XMLSchema}string"/>
* <element name="ProductName" type="{http://www.w3.org/2001/XMLSchema}string"/>
* <element name="Price" type="{http://www.w3.org/2001/XMLSchema}float"/>
* <element name="Amount" type="{http://www.w3.org/2001/XMLSchema}int"/>
* </sequence>
* </restriction>
* </complexContent>
* </complexType>
* </pre>
*
*
*/
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"productNo",
"productName",
"price",
"amount"
})
public static class Produdct { @XmlElement(name = "ProductNo", required = true)
protected String productNo;
@XmlElement(name = "ProductName", required = true)
protected String productName;
@XmlElement(name = "Price")
protected float price;
@XmlElement(name = "Amount")
protected int amount; /**
* Gets the value of the productNo property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getProductNo() {
return productNo;
} /**
* Sets the value of the productNo property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setProductNo(String value) {
this.productNo = value;
} /**
* Gets the value of the productName property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getProductName() {
return productName;
} /**
* Sets the value of the productName property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setProductName(String value) {
this.productName = value;
} /**
* Gets the value of the price property.
*
*/
public float getPrice() {
return price;
} /**
* Sets the value of the price property.
*
*/
public void setPrice(float value) {
this.price = value;
} /**
* Gets the value of the amount property.
*
*/
public int getAmount() {
return amount;
} /**
* Sets the value of the amount property.
*
*/
public void setAmount(int value) {
this.amount = value;
} } } }
order.java
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：
//
// This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, vJAXB 2.1.10 in JDK 6
// See <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a>
// Any modifications to this file will be lost upon recompilation of the source schema.
// Generated on: 2014.01.24 at 11:09:15 ���� CST
// package model; import javax.xml.bind.annotation.XmlRegistry; /**
* This object contains factory methods for each
* Java content interface and Java element interface
* generated in the model package.
* <p>An ObjectFactory allows you to programatically
* construct new instances of the Java representation
* for XML content. The Java representation of XML
* content can consist of schema derived interfaces
* and classes representing the binding of schema
* type definitions, element declarations and model
* groups. Factory methods for each of these are
* provided in this class.
*
*/
@XmlRegistry
public class ObjectFactory { /**
* Create a new ObjectFactory that can be used to create new instances of schema derived classes for package: model
*
*/
public ObjectFactory() {
} /**
* Create an instance of {@link Order.OrderItems }
*
*/
public Order.OrderItems createOrderOrderItems() {
return new Order.OrderItems();
} /**
* Create an instance of {@link Order }
*
*/
public Order createOrder() {
return new Order();
} /**
* Create an instance of {@link Order.OrderItems.Produdct }
*
*/
public Order.OrderItems.Produdct createOrderOrderItemsProdudct() {
return new Order.OrderItems.Produdct();
} }
ObjectFactory.java
4、Object <-> XML 的示例代码
public void testXmlToObj() {
JAXBContext jc;
try {
jc = JAXBContext.newInstance("model");
Unmarshaller u = jc.createUnmarshaller();
String xmlFilePath = AppTest.class.getResource("/").getPath()
+ "order.xml";
System.out.println(xmlFilePath);
Order order = (Order) u.unmarshal(new File(xmlFilePath));
assertTrue(order.getOrderNo().equals("0000001"));
assertTrue(order.getCustomerName().equals("jimmy"));
for (int i = 0; i < order.getOrderItems().getProdudct().size(); i++) {
System.out.println(getProductDesc(order.getOrderItems()
.getProdudct().get(i)));
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void testObjToXml() {
try {
ObjectFactory of = new ObjectFactory();
Order order = of.createOrder();
Order.OrderItems orderItems = of.createOrderOrderItems();
Order.OrderItems.Produdct product1 = new Order.OrderItems.Produdct();
product1.setProductNo("A-01");
product1.setProductName("Car");
product1.setPrice(1000000);
product1.setAmount(1);
orderItems.getProdudct().add(product1);
Order.OrderItems.Produdct product2 = new Order.OrderItems.Produdct();
product2.setProductNo("B-01");
product2.setProductName("Book");
product2.setPrice(200);
product2.setAmount(2);
orderItems.getProdudct().add(product2);
order.setOrderItems(orderItems);
JAXBContext jc = JAXBContext.newInstance("model");
Marshaller ms = jc.createMarshaller();
ms.setProperty("jaxb.encoding", "UTF-8");
ms.setProperty("jaxb.formatted.output", true);
String xmlFilePath = AppTest.class.getResource("/").getPath()
+ "order_new.xml";
ms.marshal(order, new File(xmlFilePath));
System.out.println("testObjToXml");
} catch (Exception e) {
e.printStackTrace();
}
}
object xml
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)
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