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java 关于xml的注解，自动生成xml文件 – @XML

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用的是jdk自带的javax.xml.bind.JAXBContext将对象和xml字符串进行相互转换。

如果对要生成的 xml 格式有点些许的限制，就会对生成xml的对象就需要进行些许控制，控制对象的一个最可行的办法就是用注解。
比较常用的几个：
@XmlRootElement：根节点
@XmlAttribute：该属性作为xml的attribute
@XmlElement：该属性作为xml的element，且可以增加属性(name=”NewElementName”)，那么生成的xml串的elment的标签是NewElementName
示例：

[java]


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  1. package


    test;



  3. import


    java.io.StringWriter;



  5. import


    javax.xml.bind.JAXBContext;


  6. import


    javax.xml.bind.JAXBException;


  7. import


    javax.xml.bind.Marshaller;



  9. import


    test.bean.EleClassA;


  10. import


    test.bean.EleClassB;


  11. import


    test.bean.RootClass;



  13. public




    class


    Test1 {



  15. public




    static




    void


    main(String[] args) {

  16. RootClass rc =

    new


    RootClass();

  17. EleClassA a =

    new


    EleClassA();

  18. EleClassB b =

    new


    EleClassB();


  20. a.setAttrC(

    “attrc”


    );

  21. a.setEleA(

    “eleA”


    );

  22. a.setEleB(

    “eleB”


    );


  24. b.setAttrPassword(

    “attrPassword”


    );

  25. b.setAttrUserName(

    “attrUsrName”


    );

  26. b.setEleCode(

    “eleCode”


    );


  28. rc.setA(a);

  29. rc.setB(b);

  30. rc.setRoot(

    “root”


    );

  31. rc.setRootA(

    “rootA”


    );



  34. JAXBContext context;


  35. try


    {

  36. context = JAXBContext.newInstance(RootClass.

    class


    );

  37. Marshaller mar = context.createMarshaller();

  38. mar.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,

    true


    );

  39. mar.setProperty(Marshaller.JAXB_ENCODING,

    “UTF-8”


    );


  41. StringWriter writer =

    new


    StringWriter();


  43. mar.marshal(rc, writer);


  45. System.out.println(writer.toString());

  46. }

    catch


    (JAXBException e) {

  47. e.printStackTrace();

  48. }


  50. }

  51. }




  54. package


    test.bean;



  56. import


    javax.xml.bind.annotation.XmlElement;


  57. import


    javax.xml.bind.annotation.XmlRootElement;



  59. @XmlRootElement


    (name=


    “rootclass”


    )


  60. public




    class


    RootClass {



  62. private


    EleClassA a;


  63. private


    EleClassB b;


  64. private


    String root;


  65. private


    String rootA;



  67. @XmlElement


    (name=


    “eleClassA”


    )


  68. public


    EleClassA getA() {


  69. return


    a;

  70. }


  71. public




    void


    setA(EleClassA a) {


  72. this


    .a = a;

  73. }


  74. @XmlElement


    (name=


    “EleclassA”


    )


  75. public


    EleClassB getB() {


  76. return


    b;

  77. }


  78. public




    void


    setB(EleClassB b) {


  79. this


    .b = b;

  80. }


  81. public


    String getRoot() {


  82. return


    root;

  83. }


  84. public




    void


    setRoot(String root) {


  85. this


    .root = root;

  86. }


  87. public


    String getRootA() {


  88. return


    rootA;

  89. }


  90. public




    void


    setRootA(String rootA) {


  91. this


    .rootA = rootA;

  92. }


  94. }




  97. package


    test.bean;



  99. import


    javax.xml.bind.annotation.XmlAttribute;


  100. import


    javax.xml.bind.annotation.XmlElement;



  102. public




    class


    EleClassA {



  104. private


    String eleA;


  105. private


    String eleB;



  107. private


    String attrC;



  109. @XmlElement


  110. public


    String getEleA() {


  111. return


    eleA;

  112. }



  114. public




    void


    setEleA(String eleA) {


  115. this


    .eleA = eleA;

  116. }



  118. @XmlElement


    (name=


    “elebnewname”


    )


  119. public


    String getEleB() {


  120. return


    eleB;

  121. }



  123. public




    void


    setEleB(String eleB) {


  124. this


    .eleB = eleB;

  125. }



  127. @XmlAttribute


    ()


  128. public


    String getAttrC() {


  129. return


    attrC;

  130. }



  132. public




    void


    setAttrC(String attrC) {


  133. this


    .attrC = attrC;

  134. }


  136. }




  139. package


    test.bean;



  141. import


    javax.xml.bind.annotation.XmlAttribute;


  142. import


    javax.xml.bind.annotation.XmlElement;



  144. public




    class


    EleClassB {



  146. private


    String attrUserName;


  147. private


    String attrPassword;



  149. private


    String eleCode;



  151. @XmlAttribute


  152. public


    String getAttrUserName() {


  153. return


    attrUserName;

  154. }


  155. public




    void


    setAttrUserName(String attrUserName) {


  156. this


    .attrUserName = attrUserName;

  157. }


  158. @XmlAttribute


    (name=


    “password”


    )


  159. public


    String getAttrPassword() {


  160. return


    attrPassword;

  161. }


  162. public




    void


    setAttrPassword(String attrPassword) {


  163. this


    .attrPassword = attrPassword;

  164. }


  165. @XmlElement


  166. public


    String getEleCode() {


  167. return


    eleCode;

  168. }


  169. public




    void


    setEleCode(String eleCode) {


  170. this


    .eleCode = eleCode;

  171. }



  174. }

运行Test1类中main方法，执行结果：


[html]


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  1. <?


    xml




    version


    =


    “1.0”




    encoding


    =


    “UTF-8”




    standalone


    =


    “yes”


    ?>


  2. <


    rootclass


    >


  3. <


    eleClassA




    attrC


    =


    “attrc”


    >


  4. <


    eleA


    >


    eleA


    </


    eleA


    >


  5. <


    elebnewname


    >


    eleB


    </


    elebnewname


    >


  6. </


    eleClassA


    >


  7. <


    EleclassA




    attrUserName


    =


    “attrUsrName”




    password


    =


    “attrPassword”


    >


  8. <


    eleCode


    >


    eleCode


    </


    eleCode


    >


  9. </


    EleclassA


    >


  10. <


    root


    >


    root


    </


    root


    >


  11. <


    rootA


    >


    rootA


    </


    rootA


    >


  12. </


    rootclass


    >


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