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用dom4j？SAX？no,no,no,光看api和帮助文档就烦，有没有更简单的方法呢？答案是有的。
那就是默默无名的：JAXB
jaxb是啥？
摘抄一段度娘百科的介绍：
1 import java.sql.Timestamp; 2 import java.text.SimpleDateFormat; 3 4 import javax.xml.bind.annotation.XmlRootElement; 5 import javax.xml.bind.annotation.adapters.XmlAdapter; 6 import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter; 7 8 /** 9 * User entity. @author MyEclipse Persistence Tools 10 */ 11 @XmlRootElement 12 public class User implements java.io.Serializable { 13 14 // Fields 15 16 /** 17 * 18 */ 19 private static final long serialVersionUID = 1L; 20 private Integer id; 21 private String username; 22 private String password; 23 private String sex; 24 25 private Timestamp registTime; 26 27 // Constructors 28 29 /** default constructor */ 30 public User() { 31 } 32 33 /** full constructor */ 34 public User(String username, String password, String sex, 35 Timestamp registTime) { 36 this.username = username; 37 this.password = password; 38 this.sex = sex; 39 this.registTime = registTime; 40 } 41 42 // Property accessors 43 44 public Integer getId() { 45 return this.id; 46 } 47 48 public void setId(Integer id) { 49 this.id = id; 50 } 51 52 public String getUsername() { 53 return this.username; 54 } 55 56 public void setUsername(String username) { 57 this.username = username; 58 } 59 60 public String getPassword() { 61 return this.password; 62 } 63 64 public void setPassword(String password) { 65 this.password = password; 66 } 67 68 public String getSex() { 69 return this.sex; 70 } 71 72 public void setSex(String sex) { 73 this.sex = sex; 74 } 75 76 @XmlJavaTypeAdapter(DateAdapter.class) 77 public Timestamp getRegistTime() { 78 return this.registTime; 79 } 80 81 public void setRegistTime(Timestamp registTime) { 82 83 this.registTime = registTime; 84 } 85 } 86 87 /** 88 * 日期类型得多花点操作和多个适配器 89 * 90 * @author Administrator 91 * 92 */ 93 class DateAdapter extends XmlAdapter<String, Timestamp> { 94 private SimpleDateFormat yyyyMMddHHmmss = new SimpleDateFormat( 95 "yyyy-MM-dd HH:mm:ss:SSS"); 96 97 @Override 98 public Timestamp unmarshal(String v) throws Exception { 99 return new Timestamp(yyyyMMddHHmmss.parse(v).getTime()); 100 } 101 102 @Override 103 public String marshal(Timestamp v) throws Exception { 104 return yyyyMMddHHmmss.format(v); 105 } 106 }
main方法测试代码：
1 public class Test1 { 2 public static void main(String[] args) { 3 File xmlFile = new File("src/user.xml"); 4 try { 5 6 JAXBContext jc = JAXBContext.newInstance(User.class); 7 8 Marshaller u=jc.createMarshaller(); 9 User user=new User(); 10 user.setId(0); 11 user.setPassword(UUID.randomUUID().toString().replaceAll("-", "")); 12 user.setRegistTime(new Timestamp(System.currentTimeMillis())); 13 user.setSex("男"); 14 user.setUsername("1231123"); 15 u.marshal(user, xmlFile); 16 } catch (Exception e) { 17 // TODO: handle exception 18 } 19 } 20 }
xml文件结果:
1 <?xml version="1.0" encoding="UTF-8" standalone="yes"?> 2 <user> 3 <id>0</id> 4 <password>2c892394522c41c29264899cfa9ea565</password> 5 <registTime>2016-09-16 10:25:33:316</registTime> 6 <sex>男</sex> 7 <username>1231123</username> 8 </user>
是不是很简单？不用dom4j，不用阅读各种api文档，不用网上搜索资料，只需要实体类上面加上注解@XmlRootElement就行了，下面介绍xml转换为java bean：
1 import java.io.File; 2 3 import javax.xml.bind.JAXBContext; 4 import javax.xml.bind.Unmarshaller; 5 6 import com.qhmcc.entity.User; 7 8 public class Test1 { 9 public static void main(String[] args) { 10 File xmlFile = new File("src/user.xml"); 11 try { 12 13 JAXBContext jc = JAXBContext.newInstance(User.class); 14 15 Unmarshaller u=jc.createUnmarshaller(); 16 User usr=(User) u.unmarshal(xmlFile); 17 System.out.println(usr.getUsername()); 18 System.out.println(usr.getPassword()); 19 System.out.println(usr.getSex()); 20 System.out.println(usr.getId()); 21 System.out.println(usr.getRegistTime()); 22 } catch (Exception e) { 23 e.printStackTrace(); 24 } 25 } 26 }
控制台结果如下：
1 1231123 2 2c892394522c41c29264899cfa9ea565 3 男 4 0 5 2016-09-16 10:25:33.316
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原文地址：http://www.cnblogs.com/swtjavaspace/p/5876026.html
