XML和JavaBean的互相转换攻略
发布时间：2010/5/20 15:04:35 来源：城市学习网 编辑：ziteng
XML和Java Bean互相转换是一个很有用的功能，因为两者有着前后合作的关系，但解析的过程比较痛苦。下面介绍如何进行XML和Java Bean的互相转换。
最近项目中用到了xml和java bean的转换
用到xml的时候我们需要遍历解析。。。然后将解析的值放入声明好的java bean，过程很痛苦，结果很美好
我们能不能直接从xml转化到java bean呢，或者直接成java bean转化到xml呢？
答案是OK的
使用jar包：org.nuxeo.common.xmap
写个小例子
XML
1.< ?xml version="1.0" encoding="UTF-8"?>
2.< books>
3.< book no="1">
4.< title>java是傻逼< /title>
5.< subject>java< /subject>
6.< subject>xml< /subject>
7.< price>10< /price>
8.< /book>
9.< book no="2">
10.< title>c++程序设计< /title>
11.< subject>C++< /subject>
12.< subject>c< /subject>
13.< price>10< /price>
14.< /book>
15.< /books>
Books类
16.import java.util.ArrayList;
17.import java.util.List;
18.
19.import org.nuxeo.common.xmap.annotation.XNodeList;
20.import org.nuxeo.common.xmap.annotation.XObject;
21.
22.@XObject(value = "books")
23.public class Books {
24. @XNodeList(value = "book", type = ArrayList.class, componentType = Book.class)
25. private List< Book> book;
26.
27. public List< Book> getBook() {
28. return book;
29. }
30.
31. public void setBook(List< Book> book) {
32. this.book = book;
33. }
34.
35. public void addBook(Book b){
36. if(book==null){
37. book=new ArrayList< Book>();
38. }
39. book.add(b);
40. }
41.}
42.
Book类
43.import java.util.ArrayList;
44.import java.util.List;
45.
46.import org.nuxeo.common.xmap.annotation.XNode;
47.import org.nuxeo.common.xmap.annotation.XNodeList;
48.import org.nuxeo.common.xmap.annotation.XObject;
49.
50.
51.@XObject
52.public class Book {
53. @XNode("title")
54. private String title;
55.
56. @XNode("@no")
57. private String no;
58.
59. @XNodeList(value = "subject", type = ArrayList.class, componentType = String.class)
60. private List< String> subjects;
61.
62. @XNode("price")
63. private int price;
64.
65. public String getTitle() {
66. return title;
67. }
68. [NextPage] 69. public void setTitle(String title) {
70. this.title = title;
71. }
72.
73. public List< String> getSubjects() {
74. return subjects;
75. }
76.
77. public void setSubjects(List< String> subjects) {
78. this.subjects = subjects;
79. }
80.
81. public int getPrice() {
82. return price;
83. }
84.
85. public void setPrice(int price) {
86. this.price = price;
87. }
88.
89. public String getNo() {
90. return no;
91. }
92.
93. public void setNo(String no) {
94. this.no = no;
95. }
96.}
97.
测试类：
98.import java.util.ArrayList;
99.import java.util.List;
100.
101.import org.nuxeo.common.xmap.XMap;
102.
103.
104.public class XmapTest {
105. public static void main(String[] args) {
106. try {
107. //声明一组书的根节点
108. Books books=new Books();
109.
110. //声明一本书
111. Book book=new Book();
112. //书的类型
113. List< String> sj=new ArrayList< String>();
114. sj.add("java");
115. sj.add("xml");
116. //设置书节点的属性
117. book.setPrice(10);
118. book.setTitle("java是傻逼");
119. book.setSubjects(sj);
120. book.setNo("1");
121.
122. //将书节点添加到跟节点
123. books.addBook(book);
124.
125. //声明一本书
126. Book book2=new Book();
127. //书的类型
128. List< String> sj2=new ArrayList< String>();
129. sj2.add("C++");
130. sj2.add("c");
131. //设置书节点的属性
132. book2.setPrice(10);
133. book2.setTitle("c++程序设计");
134. book2.setSubjects(sj2);
135. book2.setNo("2");
136.
137. //将书节点添加到跟节点
138. books.addBook(book2);
139.
140. XMap xmp = new XMap();
141. xmp.register(Books.class);
142.
143. List< String> filters = new ArrayList< String>();
144.
145. System.out.println(xmp.asXmlString(books, "UTF-8", filters, true));
146. } catch (Exception e) {
147. e.printStackTrace();
148. }
149. }
150.}
151.
运行上面这个类就可以生成开头所看见的那个XML的内容
解析xml
152.xmap.register(Books.class);
153. URL url = new File("book.xml").toURL();
154. InputStream in = new FileInputStream(new File("book.xml"));
155. Object[] result = (Object[]) xmap.loadAll(in);
156.
157.Books books=(Books)result[0];
158.
数据就完全autowire by name进入到了bean，某些情况下很好用（xml很整齐，每个节点的内容都一样，固定）
XML和Java Bean互相转换就此实现。
