唉！ 有用的拿去吧。 直接可以用。
1 package com.tai.use;
2
3 import java.text.SimpleDateFormat;
4
5 public class DataUtil
6 {
7 /**
8 * 时间格式转换，将字符串型时间转换为毫秒数
9 * "yyyy-MM-dd HH:mm:ss" => "12345" 19位
10 * "yyyyMMddHHmmss" => "12345" 14位
11 * "yyyy-MM-dd" => "12345" 10位
12 * 返回 0 是格式不对
13 * @param dateStr
14 * @return
15 */
16 public static long parseStringToLong(String dateStr) {
17 dateStr = dateStr.trim();
18 if (dateStr.length() == 19) {
19 try {
20 java.util.Calendar cal = java.util.Calendar.getInstance();
21 cal.set(Integer.parseInt(dateStr.substring(0, 4)),
22 Integer.parseInt(dateStr.substring(5, 7)) - 1,
23 Integer.parseInt(dateStr.substring(8, 10)),
24 Integer.parseInt(dateStr.substring(11, 13)),
25 Integer.parseInt(dateStr.substring(14, 16)),
26 Integer.parseInt(dateStr.substring(17, 19)));
27 cal.set(java.util.Calendar.MILLISECOND, 0);
28 return (cal.getTime().getTime());
29 } catch (Exception e) {
30 return 0;
31 }
32
33 } else if (dateStr.length() == 16) {
34 try {
35 java.util.Calendar cal = java.util.Calendar.getInstance();
36 cal.set(Integer.parseInt(dateStr.substring(0, 4)),
37 Integer.parseInt(dateStr.substring(5, 7)) - 1,
38 Integer.parseInt(dateStr.substring(8, 10)),
39 Integer.parseInt(dateStr.substring(11, 13)),
40 Integer.parseInt(dateStr.substring(14, 16)));
41 cal.set(java.util.Calendar.MILLISECOND, 0);
42 return (cal.getTime().getTime());
43 } catch (Exception e) {
44 return 0;
45 }
46 } else if (dateStr.length() == 14) {
47 try {
48 java.util.Calendar cal = java.util.Calendar.getInstance();
49 cal.set(Integer.parseInt(dateStr.substring(0, 4)),
50 Integer.parseInt(dateStr.substring(4, 6)) - 1,
51 Integer.parseInt(dateStr.substring(6, 8)),
52 Integer.parseInt(dateStr.substring(8, 10)),
53 Integer.parseInt(dateStr.substring(10, 12)),
54 Integer.parseInt(dateStr.substring(12, 14)));
55 cal.set(java.util.Calendar.MILLISECOND, 0);
56 return (cal.getTime().getTime());
57 } catch (Exception e) {
58 return 0;
59 }
60 } else if (dateStr.length() == 10) {
61 try {
62 java.util.Calendar cal = java.util.Calendar.getInstance();
63 cal.set(Integer.parseInt(dateStr.substring(0, 4)),
64 Integer.parseInt(dateStr.substring(5, 7)) - 1,
65 Integer.parseInt(dateStr.substring(8, 10)), 0, 0, 0);
66 cal.set(java.util.Calendar.MILLISECOND, 0);
67 return (cal.getTime().getTime());
68 } catch (Exception e) {
69 return 0;
70 }
71 } else {
72 try {
73 return Long.parseLong(dateStr);
74 } catch (Exception e) {
75 return 0;
76 }
77
78 }
79
80 }
81 public static String parseLongToString(long timestamp) {
82 SimpleDateFormat bartDateFormat =
83 new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
84 System.out.println(timestamp);
85 String returnStr = null;
86 try {
87 java.util.Date date = new java.util.Date(timestamp);
88 returnStr = bartDateFormat.format(date);
89 } catch (Exception ex) {
90 System.out.println(ex.getMessage());
91 }
92 return returnStr;
93 }
94
95 public static void main(String[] args)
96 {
97 // * "yyyyMMddHHmmss" => "12345" 14位
98 /**
99 * 5月24日 12:00
100 * 5月24日 14:30
101 * 5月24日 16:00
102 * 5月24日 17:30
103 * 5月25日 12:00
104 * 201405241200
105 */
106 System.out.println("print begin :");
107 System.out.println(parseLongToString(System.currentTimeMillis()));
108 System.out.println("--------------------------------------");
109 String[] strings = {"20140524120000","20140524143000","20140524160000","20140524173000","20140525120000"};
110 for (int i = 0; i < strings.length; i++)
111 {
112 long time = parseStringToLong(strings[i]);
113 System.out.println(parseLongToString(time));
114 System.out.println("--------------------------------------");
115 }
116 }
117 }
各种String类型的时间转long型，long转String
时间： 2024-08-25 14:39:50