强大的XOM包——simple-xml

simple-xml是一个xml和对象互转操作包，官方地址在这里：
http://simple.sourceforge.net/
上面提供了详细的说明和操作方法，非常强大。
这里转载下熔岩同学提供的例子，自己也从这里学到了很多，：

package test1; 

import org.simpleframework.xml.*; 
import org.simpleframework.xml.core.Persister; 

import java.io.File; 
import java.util.List; 
import java.util.ArrayList; 

@Root 
public class Example { 

        @Element 
        private String text; 

        @Attribute 
        private int index; 

        @Element() 
        private boolean flag; 

        @Element(required = false) 
        private Integer num; 

        @ElementList(required = false) 
        private List<String> slist = new ArrayList<String>(); 

        public Example() { 
                super(); 
        } 

        public Example(String text, int index) { 
                this.text = text; 
                this.index = index; 
//                slist.add("sdf"); 
        } 

        public String getMessage() { 
                return text; 
        } 

        public int getId() { 
                return index; 
        } 


        public static void main(String[] args) throws Exception { 
                Serializer serializer = new Persister(); 
                Example example = new Example("Example message", 123); 
                File result = new File("outxml/example.xml"); 

                serializer.write(example, result); 


                Example _obj = serializer.read(Example.class, result); 
                System.out.println(_obj.getMessage()); 


        } 
}

输入的文件内容：
<example index="123">
     <text>Example message</text>
     <flag>false</flag>
     <slist class="java.util.ArrayList"/>
</example>

控制台输出信息：
Example message

Process finished with exit code 0

第二个例子：

@Root 
public class Customer { 
        @Attribute(required = true) 
        private Long id; 
        @Element(required = true) 
        private String name; 
        @Element(required = false) 
        private Address address; 
        @ElementList(required = false,    type = Order.class) 
        private List<Order> orderList = new ArrayList<Order>(0); 

        public Customer() { 
        } 

        public Customer(Long id, String name) { 
                this.id = id; 
                this.name = name; 
        } 

@Root 
public class Address { 
        @Element(required = true) 
        private String code; 
        @Element 
        private String street; 
        @Element 
        private boolean isopen; 

        public Address() { 
        } 

        public Address(String code, String street, boolean isopen) { 
                this.code = code; 
                this.street = street; 
                this.isopen = isopen; 
        } 


@Root 
public class Order { 
        @Attribute(required = true) 
        private Long id; 
        @Element(required = true) 
        private Date cdate; 
        @ElementList(required = false, type = Item.class) 
        private List<Item> itemList = new ArrayList<Item>(0); 

        public Order() { 
        } 

        public Order(Long id, Date cdate) { 
                this.id = id; 
                this.cdate = cdate; 
        } 

@Root 
public class Item { 
        @Attribute 
        private Long id; 
        @Element(required = true) 
        private int num; 
        @Element(required = false) 
        private BigDecimal price; 

        public Item() { 
        } 

        public Item(int num, Long id) { 
                this.num = num; 
                this.id = id; 
        } 


package test; 

import org.simpleframework.xml.Serializer; 
import org.simpleframework.xml.core.Persister; 

import java.util.Date; 
import java.io.File; 

/** 
* Created by IntelliJ IDEA. 
* 
* @author leizhimin 2008-12-29 22:05:16 
*/ 
public class TestSimple { 
        public static void main(String[] args) throws Exception { 
                Customer customer = new Customer(111L, "张三"); 
                Order order1 = new Order(1L, new Date()); 
                Order order2 = new Order(2L, new Date()); 
                Item item11 = new Item(1, 11L); 
                Item item21 = new Item(2, 21L); 
                Address address = new Address("450000", "瑞达路XX#", true); 

                customer.setAddress(address); 
                customer.getOrderList().add(order1); 
                customer.getOrderList().add(order2); 
                order1.getItemList().add(item11); 
                order2.getItemList().add(item21); 


                Serializer serializer = new Persister(); 
                File result = new File("outxml/customer.xml"); 

                serializer.write(customer, result); 

                Customer _obj = serializer.read(Customer.class, result); 
                System.out.println(_obj.getName()); 
                System.out.println(_obj.getOrderList().get(0).getCdate()); 

        } 
}

生成的文件：
<customer id="111">
     <name>张三</name>
     <address>
            <code>450000</code>
            <street>瑞达路XX#</street>
            <isopen>true</isopen>
     </address>
     <orderList class="java.util.ArrayList">
            <order id="1">
                 <cdate>2008-12-29 23:36:36.390 CST</cdate>
                 <itemList class="java.util.ArrayList">
                        <item id="11">
                             <num>1</num>
                        </item>
                 </itemList>
            </order>
            <order id="2">
                 <cdate>2008-12-29 23:36:36.390 CST</cdate>
                 <itemList class="java.util.ArrayList">
                        <item id="21">
                             <num>2</num>
                        </item>
                 </itemList>
            </order>
     </orderList>
</customer>

控制台输出的内容：
张三
Mon Dec 29 23:36:36 CST 2008

Process finished with exit code 0