java判断字符串是否是数字的方法

1. package com.sap.cesp.creditinsight.web.app.util;
3. import java.util.regex.Matcher;
4. import java.util.regex.Pattern;
6. publicclass NumberValidationUtils {
8. privatestaticboolean isMatch(String regex, String orginal){
9. if (orginal == null || orginal.trim().equals("")) {
10. returnfalse;
11. }
12. Pattern pattern = Pattern.compile(regex);
13. Matcher isNum = pattern.matcher(orginal);
14. return isNum.matches();
15. }
17. publicstaticboolean isPositiveInteger(String orginal) {
18. return isMatch("^\\+{0,1}[1-9]\\d*", orginal);
19. }
21. publicstaticboolean isNegativeInteger(String orginal) {
22. return isMatch("^-[1-9]\\d*", orginal);
23. }
25. publicstaticboolean isWholeNumber(String orginal) {
26. return isMatch("[+-]{0,1}0", orginal) || isPositiveInteger(orginal) || isNegativeInteger(orginal);
27. }
29. publicstaticboolean isPositiveDecimal(String orginal){
30. return isMatch("\\+{0,1}[0]\\.[1-9]*|\\+{0,1}[1-9]\\d*\\.\\d*", orginal);
31. }
33. publicstaticboolean isNegativeDecimal(String orginal){
34. return isMatch("^-[0]\\.[1-9]*|^-[1-9]\\d*\\.\\d*", orginal);
35. }
37. publicstaticboolean isDecimal(String orginal){
38. return isMatch("[-+]{0,1}\\d+\\.\\d*|[-+]{0,1}\\d*\\.\\d+", orginal);
39. }
41. publicstaticboolean isRealNumber(String orginal){
42. return isWholeNumber(orginal) || isDecimal(orginal);
43. }
45. }
46. 转：http://blog.csdn.net/z69183787/article/details/12848685