jax-ws annotation使用处理复杂数据
2015-03-09 12:18
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一.Jaxb处理java对象和xml之间转换常用的annotation有:
@XmlType@XmlElement
@XmlRootElement
@XmlAttribute
@XmlAccessorType
@XmlAccessorOrder
@XmlTransient
@XmlJavaTypeAdapter
二.常用annotation使用说明
@XmlType
@XmlType用在class类的注解,常与@XmlRootElement,@XmlAccessorType一起使用。它有三个属性:name、propOrder、namespace,经常使用的只有前两个属性。如:@XmlType(name = "basicStruct", propOrder = { "intValue", "stringArray", "stringValue" )
在使用@XmlType的propOrder 属性时,必须列出JavaBean对象中的所有属性,否则会报错。
2.@XmlElement
@XmlElement将java对象的属性映射为xml的节点,在使用@XmlElement时,可通过name属性改变java对象属性在xml中显示的名称。如:@XmlElement(name="Address")
private String yourAddress;
如果 nillable为 true,那么 JavaBean 属性被映射到 XML 模式 nillable 元素声明;
如果 required为 true,则将 Javabean 属性映射到一个 minOccurs="1" 的 XML 模式元素声明。maxOccurs 为 "1" 表示单个赋值的属性,maxOccurs 为 "unbounded" 则表示多个赋值的属性。
如果 required为 false,则将 Javabean 属性映射到一个 minOccurs="0" 的 XML 模式元素声明。maxOccurs 为 "1" 表示单个赋值的属性,maxOccurs 为 "unbounded" 则表示多个赋值的属性。
3.@XmlRootElement
@XmlRootElement用于类级别的注解,对应xml的跟元素,常与 @XmlType 和 @XmlAccessorType一起使用。如:
@XmlType
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement
public class Address {}
4.@XmlAttribute
@XmlAttribute用于把java对象的属性映射为xml的属性,并可通过name属性为生成的xml属性指定别名。如:@XmlAttribute(name="Country")
private String state;
5.@XmlAccessorType
@XmlAccessorType用于指定由java对象生成xml文件时对java对象属性的访问方式。常与@XmlRootElement、@XmlType一起使用。它的属性值是XmlAccessType的4个枚举值,分 别为:XmlAccessType.FIELD:java对象中的所有成员变量
XmlAccessType.PROPERTY:java对象中所有通过getter/setter方式访问的成员变量
XmlAccessType.PUBLIC_MEMBER:java对象中所有的public访问权限的成员变量和通过getter/setter方式访问的成员变量
XmlAccessType.NONE:java对象的所有属性都不映射为xml的元素
注意:@XmlAccessorType的默认访问级别是XmlAccessType.PUBLIC_MEMBER,因此,如果java对象中的private成员变量设置了public权限的getter/setter方法,就不要在 private变量上使用@XmlElement和@XmlAttribute注解,否则在由java对象生成xml时会报同一个属性在java类里存在两次的错误。同理,如果@XmlAccessorType的访问权限 为XmlAccessType.NONE,如果在java的成员变量上使用了@XmlElement或@XmlAttribute注解,这些成员变量依然可以映射到xml文件。
6.@XmlAccessorOrder
@XmlAccessorOrder用于对java对象生成的xml元素进行排序。它有两个属性值:AccessorOrder.ALPHABETICAL:对生成的xml元素按字母书序排序
XmlAccessOrder.UNDEFINED:不排序
7.@XmlTransient
@XmlTransient用于标示在由java对象映射xml时,忽略此属性。即,在生成的xml文件中不出现此元素。
8.@XmlJavaTypeAdapter
@XmlJavaTypeAdapter常用在转换比较复杂的对象时,如map类型或者格式化日期等。使用此注解时,需要自己写一个adapter类继承XmlAdapter抽象类,并实现里面的方法。@XmlJavaTypeAdapter(value=xxx.class),value为自己定义的adapter类
XmlAdapter如下:
public abstract class XmlAdapter<ValueType,BoundType> { // Do-nothing constructor for the derived classes. protected XmlAdapter() {} // Convert a value type to a bound type. public abstract BoundType unmarshal(ValueType v); // Convert a bound type to a value type. public abstract ValueType marshal(BoundType v); }
1.Shop.java package jaxb.shop; import java.util.Set; import javax.xml.bind.annotation.XmlAccessOrder; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlAttribute; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.XmlType; import javax.xml.bind.annotation.XmlElementWrapper; import javax.xml.bind.annotation.XmlAccessorOrder; @XmlAccessorOrder(XmlAccessOrder.ALPHABETICAL) @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "shop", propOrder = { "name", "number", "describer", "address","orders" }) @XmlRootElement(name = "CHMart") public class Shop { @XmlAttribute private String name; // @XmlElement private String number; @XmlElement private String describer; @XmlElementWrapper(name = "orders") @XmlElement(name = "order") private Set<Order> orders; @XmlElement private Address address; public Shop() { } public Shop(String name, String number, String describer, Address address) { this.name = name; this.number = number; this.describer = describer; this.address = address; } getter/setter略 //同时使用了@XmlType(propOrder={})和@XmlAccessorOrder(XmlAccessOrder.ALPHABETICAL),但是生成的xml只按照propOrder定义的顺序生成元素 2.Order.java package jaxb.shop; import java.math.BigDecimal; import java.util.Date; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlAttribute; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.XmlType; import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter; @XmlType(name="order",propOrder={"shopName","orderNumber","price","amount","purDate","customer"}) @XmlAccessorType(XmlAccessType.FIELD) @XmlRootElement public class Order { // @XmlElement private String shopName; @XmlAttribute private String orderNumber; // @XmlElement @XmlJavaTypeAdapter(value=DateAdapter.class) private Date purDate; // @XmlElement private BigDecimal price; // @XmlElement private int amount; // @XmlElement private Customer customer; public Order() { } public Order(String shopName, String orderNumber, Date purDate, BigDecimal price, int amount) { this.shopName = shopName; this.orderNumber = orderNumber; this.purDate = purDate; this.price = price; this.amount = amount; } getter/setter略 //@XmlAccessorType(XmlAccessType.FIELD),所以此处注释掉了@XmlElement,xml中依然会生成这些元素 3.Customer.java package jaxb.shop; import java.util.Set; import javax.xml.bind.annotation.XmlType; import javax.xml.bind.annotation.XmlAttribute; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; @XmlType @XmlAccessorType(XmlAccessType.FIELD) @XmlRootElement public class Customer { @XmlAttribute private String name; private String gender; private String phoneNo; private Address address; private Set<Order> orders; public Customer() { } public Customer(String name, String gender, String phoneNo, Address address) { this.name = name; this.gender = gender; this.phoneNo = phoneNo; this.address = address; } getter/setter略 4.Address.java package jaxb.shop; import javax.xml.bind.annotation.XmlAttribute; import javax.xml.bind.annotation.XmlType; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlAccessOrder; import javax.xml.bind.annotation.XmlAccessorOrder; @XmlType(propOrder={"state","province","city","street","zip"}) @XmlAccessorOrder(XmlAccessOrder.ALPHABETICAL) @XmlAccessorType(XmlAccessType.NONE) @XmlRootElement public class Address { @XmlAttribute private String state; @XmlElement private String province; @XmlElement private String city; @XmlElement private String street; @XmlElement private String zip; public Address() { super(); } public Address(String state, String province, String city, String street, String zip) { super(); this.state = state; this.province = province; this.city = city; this.street = street; this.zip = zip; } getter/setter略 //注意:虽然@XmlAccessorType为XmlAccessType.NONE,但是在java类的私有属性上加了@XmlAttribute和@XmlElement注解后,这些私有成员会映射生成xml的元素 5.DateAdapter.java package jaxb.shop; import java.util.Date; import java.text.SimpleDateFormat; import javax.xml.bind.annotation.adapters.XmlAdapter; public class DateAdapter extends XmlAdapter<String, Date> { private String pattern = "yyyy-MM-dd HH:mm:ss"; SimpleDateFormat fmt = new SimpleDateFormat(pattern); @Override public Date unmarshal(String dateStr) throws Exception { return fmt.parse(dateStr); } @Override public String marshal(Date date) throws Exception { return fmt.format(date); } } //用于格式化日期在xml中的显示格式,并且由xml unmarshal为java对象时,将字符串解析为Date对象 6.ShopTest.java package jaxb.shop; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.math.BigDecimal; import java.util.Date; import java.util.HashSet; import java.util.Set; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Marshaller; import javax.xml.bind.Unmarshaller; public class ShopTest { public static void main(String[] args) throws JAXBException, IOException{ Set<Order> orders = new HashSet<Order>(); Address address1 = new Address("China", "ShangHai", "ShangHai", "Huang", "200000"); Customer customer1 = new Customer("Jim", "male", "13699990000", address1); Order order1 = new Order("Mart", "LH59900", new Date(), new BigDecimal(60), 1); order1.setCustomer(customer1); Address address2 = new Address("China", "JiangSu", "NanJing", "ZhongYangLu", "210000"); Customer customer2 = new Customer("David", "male", "13699991000", address2); Order order2 = new Order("Mart", "LH59800", new Date(), new BigDecimal(80), 1); order2.setCustomer(customer2); orders.add(order1); orders.add(order2); Address address3 = new Address("China", "ZheJiang", "HangZhou", "XiHuRoad", "310000"); Shop shop = new Shop("CHMart", "100000", "EveryThing",address3); shop.setOrder(orders); FileWriter writer = null; JAXBContext context = JAXBContext.newInstance(Shop.class); try { Marshaller marshal = context.createMarshaller(); marshal.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshal.marshal(shop, System.out); writer = new FileWriter("shop.xml"); marshal.marshal(shop, writer); } catch (Exception e) { e.printStackTrace(); } Unmarshaller unmarshal = context.createUnmarshaller(); FileReader reader = new FileReader("shop.xml") ; Shop shop1 = (Shop)unmarshal.unmarshal(reader); Set<Order> orders1 = shop1.getOrder(); for(Order order : orders1){ System.out.println("***************************"); System.out.println(order.getOrderNumber()); System.out.println(order.getCustomer().getName()); System.out.println("***************************"); } } } 7.生成的xml文件 <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <CHMart name="CHMart"> <number>100000</number> <describer>EveryThing</describer> <address state="China"> <province>ZheJiang</province> <city>HangZhou</city> <street>XiHuRoad</street> <zip>310000</zip> </address> <orders> <order orderNumber="LH59800"> <shopName>Mart</shopName> <price>80</price> <amount>1</amount> <purDate>2012-03-25 12:57:23</purDate> <customer name="David"> <gender>male</gender> <phoneNo>13699991000</phoneNo> <address state="China"> <province>JiangSu</province> <city>NanJing</city> <street>ZhongYangLu</street> <zip>210000</zip> </address> </customer> </order> <order orderNumber="LH59900"> <shopName>Mart</shopName> <price>60</price> <amount>1</amount> <purDate>2012-03-25 12:57:23</purDate> <customer name="Jim"> <gender>male</gender> <phoneNo>13699990000</phoneNo> <address state="China"> <province>ShangHai</province> <city>ShangHai</city> <street>Huang</street> <zip>200000</zip> </address> </customer> </order> </orders> </CHMart>
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