Xml与Java Object 的转换[JAXB]

XML 前端之家
前端之家收集整理的这篇文章主要介绍了Xml与Java Object 的转换[JAXB]，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。

http://a123159521.iteye.com/blog/1987300

Java代码
  1. packageycl.learn.xml.jaxb;
  3. importjava.io.File;
  4. importjava.io.FileInputStream;
  5. importjava.io.FileNotFoundException;
  6. importjava.io.FileOutputStream;
  7. importjava.io.InputStream;
  8. importjava.io.OutputStream;
  10. importjavax.xml.bind.JAXBContext;
  11. importjavax.xml.bind.JAXBException;
  12. importjavax.xml.bind.Marshaller;
  13. importjavax.xml.bind.Unmarshaller;
  15. publicclassJAXBUtil<T>{
  17. @SuppressWarnings("unchecked")
  18. publicTunmarshal(Class<T>clazz,InputStreamis)throwsJAXBException{
  19. JAXBContextcontext=JAXBContext.newInstance(clazz);
  20. Unmarshallerun=context.createUnmarshaller();
  21. return(T)un.unmarshal(is);
  22. }
  24. publicTunmarshal(Class<T>clazz,Filefile)throwsJAXBException,FileNotFoundException{
  25. returnunmarshal(clazz,newFileInputStream(file));
  26. }
  28. publicvoidmarshal(Telement,OutputStreamos)throwsJAXBException{
  29. JAXBContextjc=JAXBContext.newInstance(element.getClass());
  30. Marshallerm=jc.createMarshaller();
  31. m.marshal(element,os);
  32. }
  34. publicvoidmarshal(Telement,Fileoutput)throwsFileNotFoundException,JAXBException{
  35. marshal(element,newFileOutputStream(output));
  36. }
  39. }


this is the simple util that packaging the JAXB operator.
then we can use it simplely.

1. we just export simple JODO to xml
Java代码
  1. packageycl.learn.xml.jaxb;
  3. importjavax.xml.bind.annotation.XmlRootElement;
  5. @XmlRootElement
  6. publicclassEmployeeDO{
  7. privateintid;
  9. privateStringgender;
  11. privateintage;
  13. privateStringname;
  15. privateStringrole;
  17. privateStringpassword;
  19. publicStringgetPassword(){
  20. returnpassword;
  21. }
  23. publicvoidsetPassword(Stringpassword){
  24. this.password=password;
  25. }
  27. publicintgetId(){
  28. returnid;
  29. }
  31. publicvoidsetId(intid){
  32. this.id=id;
  33. }
  35. publicintgetAge(){
  36. returnage;
  37. }
  39. publicvoidsetAge(intage){
  40. this.age=age;
  41. }
  43. publicStringgetName(){
  44. returnname;
  45. }
  47. publicvoidsetName(Stringname){
  48. this.name=name;
  49. }
  51. publicStringgetGender(){
  52. returngender;
  53. }
  55. publicvoidsetGender(Stringgender){
  56. this.gender=gender;
  57. }
  59. publicStringgetRole(){
  60. returnrole;
  61. }
  63. publicvoidsetRole(Stringrole){
  64. this.role=role;
  65. }
  67. @Override
  68. publicStringtoString(){
  69. return"ID="+id+"NAME="+name+"AGE="+age+"GENDER="
  70. +gender+"ROLE="+role+"PASSWORD="+password;
  71. }
  72. }


we must add @XmlRootElement to point this object is the root object for export.
Java代码
  1. packageycl.learn.xml.jaxb;
  3. importjava.io.File;
  4. importjava.io.FileNotFoundException;
  6. importjavax.xml.bind.JAXBException;
  8. publicclassJAXBUtilTest{
  9. privatestaticfinalStringFILE_NAME="jaxb-emp-jaxbutil.xml";
  10. /**
  11. *@paramargs
  12. *@throwsJAXBException
  13. *@throwsFileNotFoundException
  14. */
  15. publicstaticvoidmain(String[]args)throwsFileNotFoundException,JAXBException{
  16. //TODOAuto-generatedmethodstub
  17. EmployeeDOemp=newEmployeeDO();
  18. emp.setId(1);
  19. emp.setAge(25);
  20. emp.setName("Pankaj");
  21. emp.setGender("Male");
  22. emp.setRole("Developer");
  23. emp.setPassword("sensitive");
  24. JAXBUtil<EmployeeDO>ju=newJAXBUtil<EmployeeDO>();
  25. ju.marshal(emp,newFile(FILE_NAME));
  26. System.out.println("generatorsuccess");
  27. EmployeeDOempant=ju.unmarshal(EmployeeDO.class,newFile(FILE_NAME));
  28. System.out.println("readersuccess");
  29. System.out.println(empant);
  30. }
  32. }


we can easily use JAXBUtil to marshal Object to file.
we can also easily use JAXBUtil to unmarchal File to Object.

Java代码
  1. <?xmlversion="1.0"encoding="UTF-8"standalone="yes"?>
  2. <employeeDO>
  3. <age>25</age>
  4. <gender>Male</gender>
  5. <id>1</id>
  6. <name>Pankaj</name>
  7. <password>sensitive</password>
  8. <role>Developer</role>
  9. </employeeDO>


If you review this code carefully,you will find the default root element name is the Object's name with first letter is lowercase.
the element under the root element is the attribute of the object.
Q1: can i change the Element Name,to generator Xml
Java代码
  1. packageycl.learn.xml.jaxb;
  3. importjavax.xml.bind.annotation.XmlElement;
  4. importjavax.xml.bind.annotation.XmlRootElement;
  6. @XmlRootElement(name="content")
  7. publicclassEmployeeDO{
  8. privateintid;
  10. privateStringgender;
  12. privateintage;
  14. privateStringname;
  16. privateStringrole;
  18. privateStringpassword;
  20. @XmlElement(name="pwd")
  21. publicStringgetPassword(){
  22. returnpassword;
  23. }
  25. publicvoidsetPassword(Stringpassword){
  26. this.password=password;
  27. }
  29. publicintgetId(){
  30. returnid;
  31. }
  33. publicvoidsetId(intid){
  34. this.id=id;
  35. }
  37. publicintgetAge(){
  38. returnage;
  39. }
  41. publicvoidsetAge(intage){
  42. this.age=age;
  43. }
  45. publicStringgetName(){
  46. returnname;
  47. }
  49. publicvoidsetName(Stringname){
  50. this.name=name;
  51. }
  53. publicStringgetGender(){
  54. returngender;
  55. }
  57. publicvoidsetGender(Stringgender){
  58. this.gender=gender;
  59. }
  61. publicStringgetRole(){
  62. returnrole;
  63. }
  65. publicvoidsetRole(Stringrole){
  66. this.role=role;
  67. }
  69. @Override
  70. publicStringtoString(){
  71. return"ID="+id+"NAME="+name+"AGE="+age+"GENDER="
  72. +gender+"ROLE="+role+"PASSWORD="+password;
  73. }
  74. }

we just need to set the @XmlRootElement or @XmlElement's name is ok.then the xml content is
Java代码
  1. <?xmlversion="1.0"encoding="UTF-8"standalone="yes"?>
  2. <content>
  3. <age>25</age>
  4. <gender>Male</gender>
  5. <id>1</id>
  6. <name>Pankaj</name>
  7. <pwd>sensitive</pwd>
  8. <role>Developer</role>
  9. </content>


Q2: can i point that some attribute of Object i don't want to export

Java代码
  1. packageycl.learn.xml.jaxb;
  3. importjavax.xml.bind.annotation.XmlElement;
  4. importjavax.xml.bind.annotation.XmlRootElement;
  5. importjavax.xml.bind.annotation.XmlTransient;
  7. @XmlRootElement(name="content")
  8. publicclassEmployeeDO{
  9. privateintid;
  11. privateStringgender;
  13. privateintage;
  15. privateStringname;
  17. privateStringrole;
  19. privateStringpassword;
  21. @XmlElement(name="pwd")
  22. publicStringgetPassword(){
  23. returnpassword;
  24. }
  26. publicvoidsetPassword(Stringpassword){
  27. this.password=password;
  28. }
  30. @XmlTransient
  31. publicintgetId(){
  32. returnid;
  33. }
  35. publicvoidsetId(intid){
  36. this.id=id;
  37. }
  39. publicintgetAge(){
  40. returnage;
  41. }
  43. publicvoidsetAge(intage){
  44. this.age=age;
  45. }
  47. publicStringgetName(){
  48. returnname;
  49. }
  51. publicvoidsetName(Stringname){
  52. this.name=name;
  53. }
  55. publicStringgetGender(){
  56. returngender;
  57. }
  59. publicvoidsetGender(Stringgender){
  60. this.gender=gender;
  61. }
  63. publicStringgetRole(){
  64. returnrole;
  65. }
  67. publicvoidsetRole(Stringrole){
  68. this.role=role;
  69. }
  71. @Override
  72. publicStringtoString(){
  73. return"ID="+id+"NAME="+name+"AGE="+age+"GENDER="
  74. +gender+"ROLE="+role+"PASSWORD="+password;
  75. }
  76. }


you can add @XmlTransient before the getMethod,then this attribute won't be export.
Java代码
  1. <?xmlversion="1.0"encoding="UTF-8"standalone="yes"?>
  2. <content>
  3. <age>25</age>
  4. <gender>Male</gender>
  5. <name>Pankaj</name>
  6. <pwd>sensitive</pwd>
  7. <role>Developer</role>
  8. </content>


Q3: can i export the attribute of Object as attribute,not Element of xml,and change the attribute name

Java代码
  1. @XmlAttribute(name="agefather")
  2. publicintgetAge(){
  3. returnage;
  4. }

very easily to change sub element to attribute.

Java代码
  1. <?xmlversion="1.0"encoding="UTF-8"standalone="yes"?>
  2. <contentagefather="25">
  3. <gender>Male</gender>
  4. <name>Pankaj</name>
  5. <pwd>sensitive</pwd>
  6. <role>Developer</role>
  7. </content>


Q4: i want to export the xml element as my order

Java代码
  1. @XmlRootElement(name="content")
  2. @XmlType(propOrder={"gender","age","name","role","password"})
  3. publicclassEmployeeDO


Java代码
  1. <?xmlversion="1.0"encoding="UTF-8"standalone="yes"?>
  2. <contentagefather="25">
  3. <gender>Male</gender>
  4. <name>Pankaj</name>
  5. <role>Developer</role>
  6. <pwd>sensitive</pwd>
  7. </content>


you can see this element is ordered by our defined.

Q5: i want to export list of Objects

Java代码
  1. @XmlElementWrapper(name="employees")
  2. @XmlElement(name="employee")
  3. publicList<Employee>getEmployees(){
  4. returnemployees;
  5. }


Java代码
  1. <employees>
  2. <employee>
  3. <age>25</age>
  4. <gender>GGGGGG</gender>
  5. <id>1</id>
  6. <name>Pankaj</name>
  7. <password>sensitive</password>
  8. <role>Developer</role>
  9. <family></family>
  10. </employee>
  11. <employee>
  12. <age>25</age>
  13. <gender>GGGGGGG</gender>
  14. <id>1</id>
  15. <name>Pankaj</name>
  16. <password>sensitive</password>
  17. <role>Developer</role>
  18. <family></family>
  19. </employee>
  20. </employees>


Q5: i want to export list of Objects in other Object

Java代码
  1. [ClassA]
  2. publicFamilygetFamily(){
  3. returnfamily;
  4. }


Java代码
  1. publicclassFamily{
  3. privateList<Employee>employees;
  5. @XmlElement(name="employee")
  6. publicList<Employee>getEmployees(){
  7. returnemployees;
  8. }
  10. publicvoidsetEmployees(List<Employee>employees){
  11. this.employees=employees;
  12. }
  13. }

Java代码
  1. <family>
  2. <employee>
  3. <age>25</age>
  4. <gender>LLLLLLL</gender>
  5. <id>1</id>
  6. <name>Pankaj</name>
  7. <password>sensitive</password>
  8. <role>Developer</role>
  9. <family></family>
  10. </employee>
  11. <employee>
  12. <age>25</age>
  13. <gender>Male</gender>
  14. <id>1</id>
  15. <name>Pankaj</name>
  16. <password>sensitive</password>
  17. <role>Developer</role>
  18. <family></family>
  19. </employee>
  20. </family>
oh,you just don't to defined family,because it is the element of the object,default define is ok. the employee is multiple in family,you just define the @XmlElement empoyee is ok,and this will be auto add to list so this is you can think of the four questions,and i can't think other situations,and i think this four points can resolve all problems that we encountered,we can easily change xml Element name,Element attribute,Element order,that's cool.

猜你在找的XML相关文章

10分钟掌握XML、JSON及其解析
引言 NOKIA 有句著名的广告语：“科技以人为本”。任何技术都是为了满足人的生产生活需要而...
[CXF REST标准实战系列] 一、JAXB xml与javaBean的转换
Writer：BYSocket（泥沙砖瓦浆木匠） 微博：BYSocket 豆瓣：BYSocket Reprint it anywhere...
[CXF REST标准实战系列] 一、JAXB xml与javaBean的转换
Writer：BYSocket（泥沙砖瓦浆木匠） 微博：BYSocket 豆瓣：BYSocket Reprint it anywhere...
10分钟掌握XML、JSON及其解析
http://blog.jobbole.com/79252/ 引言 NOKIA 有句著名的广告语：“科技以人为本”。任何技...
自定义圆形控件RoundImageView并认识一下attr.xml
(点击上方公众号，可快速关注) 公众号：smart_android 作者：耿广龙｜loonggg 点击“阅读原...
10分钟掌握XML、JSON及其解析
引言 NOKIA 有句著名的广告语：“科技以人为本”。任何技术都是为了满足人的生产生活需要而...
10分钟掌握XML、JSON及其解析(上)
 (点击上方公众号，可快速关注) 来源： Long Luo 的博客 链接：http://longluo.github.i...
10分钟掌握XML、JSON及其解析(中)
接上文 二、JSON XML很好很强大，但是最近有另外一个时代弄潮儿，这就是JSON。现在JSON的光...
10分钟掌握XML、JSON及其解析(下)
接上文 2.4 如何解析JSON？ Android JSON所有相关类，都在org.json包下。 包括JSONObject、...
10分钟掌握XML、JSON及其解析
原文出处：  Long Luo 的博客（@Long_Luo）   引言 NOKIA 有句著名的广告语：“科技以人...
HTMLHTML5JavaScriptCSSjQueryBootstrapAngularjsTypeScriptVueDojoJsonElectronNode.jsextjsExpress XMLES6AjaxFlashUnityReactFlexAnt DesignWeb前端微信小程序微信公众号
关闭广告单独headers封装代码提示错误整数正则非0开头跳页出页码antd table提示URL未注册公众号支付vue hash模式iSlider车牌键盘循环图片echarts 双折左右布局DllPlugin对象创建打字游戏圈选两栏云函数蒙版ES2020橱窗无缝滚动轮播色块碰撞组件销毁文档操作