Simple---強大的XOM工具
Simple---強大的XOM工具
在Java應用中作XML與Java對象的雙向轉換每每是件費力不討好的事情，若是一個應用的核心數據交換是以XML爲核心的，作這種轉換每每風險很大，真正複雜的地方實際上是XML到Java的轉換。
本人也算一個Java的狂熱分子，曾經對SUN提供的類庫深信不疑，對Apache提供的組件禮頂膜拜，結果狠狠被SUN和Apache噁心了一把-----SUN的XML API像腫瘤同樣畸形發展，尤爲到了J2EE規範部分，複雜的使人望而卻步。Apache提供了幾個XML組建工具，與Java互轉的有Betwixt2，結果bug多多，像漏氣的車胎，你沒法依賴它能走多遠！
鬱悶之極，已經到了山窮水盡的地步，眼下項目就尾聲了，總不能退回到石器時代重拾DOM4j吧！到open-open上找找，終於柳暗花明，Simple---強大的XOM工具，橫掃我心中的疑雲，Simple！
通過一些測試，Simple果真不負衆望，之前遇到的問題輕鬆搞定！
一個多小時時間就能夠熟悉了裏面的API和開發文檔了。有空我寫個教程上來。
官方主頁：
建議在看以前，花10分鐘看看開發指南，基本上就看了八九不離十了：
下面給兩個例子，第一個簡單的，來自開發指南：
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());
}
}
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());
}
}
輸入的文件內容：
<
example
index
="123"
>
< text >Example message </ text >
< flag >false </ flag >
< slist class ="java.util.ArrayList" />
</ example >
< text >Example message </ text >
< flag >false </ flag >
< slist class ="java.util.ArrayList" />
</ example >
控制太輸出信息：
Example message
Process finished with exit code 0
Process finished with exit code 0
第二個，我本身定製的，僅僅省略了getter/setter：
@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;
}
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, "張三");
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", "瑞達路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());
}
}
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, "張三");
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", "瑞達路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 >張三 </ name >
< address >
< code >450000 </ code >
< street >瑞達路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 >
< name >張三 </ name >
< address >
< code >450000 </ code >
< street >瑞達路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 >
控制檯輸出的內容：
張三
Mon Dec 29 23:36:36 CST 2008
Process finished with exit code 0
Mon Dec 29 23:36:36 CST 2008
Process finished with exit code 0
總結下：
Simple的確簡單，好用，是一個優良的XML Object Mapping轉換工具，簡單到沒有必要對API進行苦心積慮的研究和摸索。
Simple能夠靈活定製XML的格式、元素名、命名空間、集合、數組、複雜對象等等支持都很好，而且Simple還能夠驗證XML是否能夠正確轉換爲對象。
Simple要求每一個Bean必須提供一個默認的構造方法，這是個開發參考中沒有明確提出的要求，我通過大量測試發現的。不然，你再從XML轉Java的時候會拋出一個莫名其妙的異常。
感謝Simple的開發團隊，幫我殺出重圍！
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