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：
@XmlRootElement
public class Student {
private String name;
private String width;
private String height;
private int age;
public Student() {
super();
}
public Student(String name, String width, String height, int age) {
super();
this.name = name;
this.width = width;
this.height = height;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getWidth() {
return width;
}
public void setWidth(String width) {
this.width = width;
}
public String getHeight() {
return height;
}
public void setHeight(String height) {
this.height = height;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "Student [name=" + name + ", width=" + width + ", height="
+ height + ", age=" + age + "]";
}
}
BaseTest.java:
public class BaseTest {
@Test
public void test01() throws JAXBException {
JAXBContext jc = JAXBContext.newInstance(Student.class);
Marshaller ms = jc.createMarshaller();
ms.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
ms.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
Student st = new Student("zhang", "w", "h", 11);
ms.marshal(st, new File("student.xml"));
StringWriter writer = new StringWriter();
ms.marshal(st, writer);
System.out.println(writer.toString());
}
@Test
public void test02() throws JAXBException {
String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>"
+ "<student><age>11</age><height>h</height><name>zhang</name><width>w</width></student>";
JAXBContext jc = JAXBContext.newInstance(Student.class);
Unmarshaller unmar = jc.createUnmarshaller();
File f = new File("student.xml");
Student st = (Student)unmar.unmarshal(f);
System.out.println(st);
Student st1 = (Student)unmar.unmarshal(new StringReader(xml));
System.out.println(st1);
}
}
@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:
@XmlRootElement(name="rootclass")
public class RootClass {
private EleClassA a;
private EleClassB b;
private String root;
private String rootA;
private String transientField;
public RootClass() {
super();
}
public RootClass(String transientField) {
//super();
this.transientField = transientField;
}
private List<String> items;
@XmlElement(name="eleClassA")
public EleClassA getA() {
return a;
}
public void setA(EleClassA a) {
this.a = a;
}
@XmlElement(name="EleClassA")
public EleClassB getB() {
return b;
}
public void setB(EleClassB b) {
this.b = b;
}
public String getRoot() {
return root;
}
public void setRoot(String root) {
this.root = root;
}
@XmlTransient
public String getRootA() {
return rootA;
}
public void setRootA(String rootA) {
this.rootA = rootA;
}
@XmlElementWrapper(name="items")
@XmlElement(name="item")
public List<String> getItems() {
return items;
}
public void setItems(List<String> items) {
this.items = items;
}
}
EleClassA:
public class EleClassA {
private String eleA;
private String eleB;
private String attrC;
@XmlElement
public String getEleA() {
return eleA;
}
public void setEleA(String eleA) {
this.eleA = eleA;
}
@XmlElement(name="elebnewname")
public String getEleB() {
return eleB;
}
public void setEleB(String eleB) {
this.eleB = eleB;
}
@XmlAttribute
public String getAttrC() {
return attrC;
}
public void setAttrC(String attrC) {
this.attrC = attrC;
}
}
EleClassB:
public class EleClassB {
private String attrUserName;
private String attrPassword;
private String eleCode;
@XmlAttribute
public String getAttrUserName() {
return attrUserName;
}
public void setAttrUserName(String attrUserName) {
this.attrUserName = attrUserName;
}
@XmlAttribute(name="password")
public String getAttrPassword() {
return attrPassword;
}
public void setAttrPassword(String attrPassword) {
this.attrPassword = attrPassword;
}
@XmlElement
public String getEleCode() {
return eleCode;
}
public void setEleCode(String eleCode) {
this.eleCode = eleCode;
}
}
AttributeTest:
public class AttributeTest {
@Test
public void test01() throws JAXBException {
RootClass rc = new RootClass("transient");
//RootClass rc = new RootClass();
EleClassA a = new EleClassA();
EleClassB b = new EleClassB();
a.setAttrC("attrC");
a.setEleA("eleA");
a.setEleB("eleB");
b.setAttrPassword("attrPassword");
b.setAttrUserName("attrUsrName");
b.setEleCode("eleCode");
List<String> l = new ArrayList<String>();
l.add("yingzhongwen");
l.add("hetao");
l.add("xinwang");
rc.setA(a);
rc.setB(b);
rc.setRoot("root");
rc.setRootA("rootA");
rc.setItems(l);
JAXBContext context = JAXBContext.newInstance(RootClass.class);
Marshaller mar = context.createMarshaller();
mar.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
mar.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
StringWriter writer = new StringWriter();
mar.marshal(rc, writer);
System.out.println(writer.toString());
}
}