java对于xml的转换有很多种，比较有名的有:DOM, DOM4J, JDOM, SAX。这里要介绍的是javax.xml包的对xml文件的转换。相比于前面几种是最简单的。
直接上代码：
Student.java：
1 @XmlRootElement
2 public class Student {
3 private String name;
4 private String width;
5 private String height;
6 private int age;
7 public Student() {
8 super();
9 }
10 public Student(String name, String width, String height, int age) {
11 super();
12 this.name = name;
13 this.width = width;
14 this.height = height;
15 this.age = age;
16 }
17 public String getName() {
18 return name;
19 }
20 public void setName(String name) {
21 this.name = name;
22 }
23 public String getWidth() {
24 return width;
25 }
26 public void setWidth(String width) {
27 this.width = width;
28 }
29 public String getHeight() {
30 return height;
31 }
32 public void setHeight(String height) {
33 this.height = height;
34 }
35 public int getAge() {
36 return age;
37 }
38 public void setAge(int age) {
39 this.age = age;
40 }
41 @Override
42 public String toString() {
43 return "Student [name=" + name + ", width=" + width + ", height="
44 + height + ", age=" + age + "]";
45 }
46
47 }
BaseTest.java:
1 public class BaseTest {
2 @Test
3 public void test01() throws JAXBException {
4 JAXBContext jc = JAXBContext.newInstance(Student.class);
5 Marshaller ms = jc.createMarshaller();
6 ms.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
7 ms.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
8 Student st = new Student("zhang", "w", "h", 11);
9 ms.marshal(st, new File("student.xml"));
10
11 StringWriter writer = new StringWriter();
12 ms.marshal(st, writer);
13 System.out.println(writer.toString());
14 }
15 @Test
16 public void test02() throws JAXBException {
17 String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>"
18 + "<student><age>11</age><height>h</height><name>zhang</name><width>w</width></student>";
19 JAXBContext jc = JAXBContext.newInstance(Student.class);
20 Unmarshaller unmar = jc.createUnmarshaller();
21 File f = new File("student.xml");
22 Student st = (Student)unmar.unmarshal(f);
23 System.out.println(st);
24 Student st1 = (Student)unmar.unmarshal(new StringReader(xml));
25 System.out.println(st1);
26 }
27 }
@XmlRootElement即是对该类进行反射映射为xml。
如果没有@XmlElement，默认对Property进行反射，xml node的名字与该属性名相同，如果不同，需要加上@XmlElement
如果有@XmlElement，注意该注解必须放与get方法之前。
RootClass:
1 @XmlRootElement(name="rootclass")
2 public class RootClass {
3
4 private EleClassA a;
5
6 private EleClassB b;
7
8 private String root;
9
10 private String rootA;
11 private String transientField;
12
13 public RootClass() {
14 super();
15 }
16 public RootClass(String transientField) {
17 //super();
18 this.transientField = transientField;
19 }
20 private List<String> items;
21
22 @XmlElement(name="eleClassA")
23 public EleClassA getA() {
24 return a;
25 }
26 public void setA(EleClassA a) {
27 this.a = a;
28 }
29 @XmlElement(name="EleClassA")
30 public EleClassB getB() {
31 return b;
32 }
33 public void setB(EleClassB b) {
34 this.b = b;
35 }
36 public String getRoot() {
37 return root;
38 }
39 public void setRoot(String root) {
40 this.root = root;
41 }
42 @XmlTransient
43 public String getRootA() {
44 return rootA;
45 }
46 public void setRootA(String rootA) {
47 this.rootA = rootA;
48 }
49 @XmlElementWrapper(name="items")
50 @XmlElement(name="item")
51 public List<String> getItems() {
52 return items;
53 }
54 public void setItems(List<String> items) {
55 this.items = items;
56 }
57 }
EleClassA:
1 public class EleClassA {
2 private String eleA;
3 private String eleB;
4 private String attrC;
5 @XmlElement
6 public String getEleA() {
7 return eleA;
8 }
9 public void setEleA(String eleA) {
10 this.eleA = eleA;
11 }
12 @XmlElement(name="elebnewname")
13 public String getEleB() {
14 return eleB;
15 }
16 public void setEleB(String eleB) {
17 this.eleB = eleB;
18 }
19 @XmlAttribute
20 public String getAttrC() {
21 return attrC;
22 }
23 public void setAttrC(String attrC) {
24 this.attrC = attrC;
25 }
26
27 }
EleClassB:
1 public class EleClassB {
2 private String attrUserName;
3 private String attrPassword;
4 private String eleCode;
5 @XmlAttribute
6 public String getAttrUserName() {
7 return attrUserName;
8 }
9 public void setAttrUserName(String attrUserName) {
10 this.attrUserName = attrUserName;
11 }
12 @XmlAttribute(name="password")
13 public String getAttrPassword() {
14 return attrPassword;
15 }
16 public void setAttrPassword(String attrPassword) {
17 this.attrPassword = attrPassword;
18 }
19 @XmlElement
20 public String getEleCode() {
21 return eleCode;
22 }
23 public void setEleCode(String eleCode) {
24 this.eleCode = eleCode;
25 }
26 }
AttributeTest:
1 public class AttributeTest {
2
3 @Test
4 public void test01() throws JAXBException {
5 RootClass rc = new RootClass("transient");
6 //RootClass rc = new RootClass();
7 EleClassA a = new EleClassA();
8 EleClassB b = new EleClassB();
9
10 a.setAttrC("attrC");
11 a.setEleA("eleA");
12 a.setEleB("eleB");
13
14 b.setAttrPassword("attrPassword");
15 b.setAttrUserName("attrUsrName");
16 b.setEleCode("eleCode");
17
18 List<String> l = new ArrayList<String>();
19 l.add("yingzhongwen");
20 l.add("hetao");
21 l.add("xinwang");
22
23 rc.setA(a);
24 rc.setB(b);
25 rc.setRoot("root");
26 rc.setRootA("rootA");
27 rc.setItems(l);
28
29 JAXBContext context = JAXBContext.newInstance(RootClass.class);
30 Marshaller mar = context.createMarshaller();
31 mar.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
32 mar.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
33
34 StringWriter writer = new StringWriter();
35 mar.marshal(rc, writer);
36 System.out.println(writer.toString());
37 }
38 }
时间： 2024-08-28 15:27:48