XmlUtil工具类(toxml()和toBean())

1. /**

2. * 输出xml和解析xml的工具类

3. *@ClassName:XmlUtil

4. *@author: chenyoulong Email: [email protected]

5. *@date :2012-9-29 上午9:51:28

6. *@Description:TODO

7. */

8. public class XmlUtil{

9. /**

10. * java 转换成xml

11. * @Title: toXml

12. * @Description: TODO

13. * @param obj 对象实例

14. * @return String xml字符串

15. */

16. public static String toXml(Object obj){

17. XStream xstream=new XStream();

18. // XStream xstream=new XStream(new DomDriver()); //直接用jaxp dom来解释

19. // XStream xstream=new XStream(new DomDriver("utf-8")); //指定编码解析器,直接用jaxp dom来解释

20.  

21. ////如果没有这句，xml中的根元素会是<包.类名>；或者说：注解根本就没生效，所以的元素名就是类的属性

22. xstream.processAnnotations(obj.getClass()); //通过注解方式的，一定要有这句话

23. return xstream.toXML(obj);

24. }

25.  

26. /**

27. * 将传入xml文本转换成Java对象

28. * @Title: toBean

29. * @Description: TODO

30. * @param xmlStr

31. * @param cls xml对应的class类

32. * @return T xml对应的class类的实例对象

33. *

34. * 调用的方法实例：PersonBean person=XmlUtil.toBean(xmlStr, PersonBean.class);

35. */

36. public static <T> T toBean(String xmlStr,Class<T> cls){

37. //注意：不是new Xstream(); 否则报错：java.lang.NoClassDefFoundError: org/xmlpull/v1/XmlPullParserFactory

38. XStream xstream=new XStream(new DomDriver());

39. xstream.processAnnotations(cls);

40. T obj=(T)xstream.fromXML(xmlStr);

41. return obj;

42. }

43.  

44. /**

45. * 写到xml文件中去

46. * @Title: writeXMLFile

47. * @Description: TODO

48. * @param obj 对象

49. * @param absPath 绝对路径

50. * @param fileName 文件名

51. * @return boolean

52. */

53.  

54. public static boolean toXMLFile(Object obj, String absPath, String fileName ){

55. String strXml = toXml(obj);

56. String filePath = absPath + fileName;

57. File file = new File(filePath);

58. if(!file.exists()){

59. try {

60. file.createNewFile();

61. } catch (IOException e) {

62. log.error("创建{"+ filePath +"}文件失败!!!" + Strings.getStackTrace(e));

63. return false ;

64. }

65. }// end if

66. OutputStream ous = null ;

67. try {

68. ous = new FileOutputStream(file);

69. ous.write(strXml.getBytes());

70. ous.flush();

71. } catch (Exception e1) {

72. log.error("写{"+ filePath +"}文件失败!!!" + Strings.getStackTrace(e1));

73. return false;

74. }finally{

75. if(ous != null )

76. try {

77. ous.close();

78. } catch (IOException e) {

79. log.error("写{"+ filePath +"}文件关闭输出流异常!!!" + Strings.getStackTrace(e));

80. }

81. }

82. return true ;

83. }

84.  

85. /**

86. * 从xml文件读取报文

87. * @Title: toBeanFromFile

88. * @Description: TODO

89. * @param absPath 绝对路径

90. * @param fileName 文件名

91. * @param cls

92. * @throws Exception

93. * @return T

94. */

95. public static <T> T toBeanFromFile(String absPath, String fileName,Class<T> cls) throws Exception{

96. String filePath = absPath +fileName;

97. InputStream ins = null ;

98. try {

99. ins = new FileInputStream(new File(filePath ));

100. } catch (Exception e) {

101. throw new Exception("读{"+ filePath +"}文件失败！", e);

102. }

103.  

104. String encode = useEncode(cls);

105. XStream xstream=new XStream(new DomDriver(encode));

106. xstream.processAnnotations(cls);

107. T obj =null;

108. try {

109. obj = (T)xstream.fromXML(ins);

110. } catch (Exception e) {

111. // TODO Auto-generated catch block

112. throw new Exception("解析{"+ filePath +"}文件失败！",e);

113. }

114. if(ins != null)

115. ins.close();

116. return obj;

117. }

118.  

119. }