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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 }
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原文地址：http://www.cnblogs.com/yingzhongwen/p/5610096.html
