//格式固定的话不需要想太复杂吧
String[] strArr = "2011_09_14_15_58_28".split("_");
System.out.println(new StringBuilder(strArr[0]).append("-").append(
    strArr[1]).append("-").append(strArr[2]).append(" ").append(
    strArr[3]).append(":").append(strArr[4]).append(":").append(
    strArr[5]).toString());

------解决方案--------------------
Java code

SimpleDateFormat sdf = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss");
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

sdf2.format(sdf.parse("2011_09_14_15_58_28"));

------解决方案--------------------
探讨


Java code

//格式固定的话不需要想太复杂吧
String[] strArr = "2011_09_14_15_58_28".split("_");
System.out.println(new StringBuilder(strArr[0]).append("-").append(
    strArr[1]).append("-").append(strArr[2]).appen……


------解决方案--------------------
Java code


import java.text.*;
import java.util.*;

public class Test {
    public static void main(String[] args) throws Exception {
        String s = "2011_09_14_15_58_28";
        SimpleDateFormat format = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss");
        Date date = format.parse(s);
        format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        System.out.println(format.format(date));
    }
}

------解决方案--------------------
for example
Java code
String s = "2011_09_14_15_58_28";
String[] sa = s.split("_");
s = String.format("%s-%s-%s %s:%s:%s", sa[0], sa[1], sa[2], sa[3], sa[4], sa[5]);
or
StringBuilder buf = new StringBuilder();
for (int i=0; i<sa.length; i++) {
    if (i < 2) {
        buf.append(sa[i]).append("-");
    } else if (i == 2) {
        buf.append(s[i]).append(" ");
    } else if (i < 5) {
        buf.append(s[i]).append(":");
    } else {
       buf.append(sa[i]);
    }
}
s = buf.toString();

------解决方案--------------------
个人觉得2楼好,不用很多对象,很多对象,简单实际.

------解决方案--------------------
探讨


Java code

//格式固定的话不需要想太复杂吧
String[] strArr = "2011_09_14_15_58_28".split("_");
System.out.println(new StringBuilder(strArr[0]).append("-").append(
    strArr[1]).append("-").append(strArr[2]).appen……


------解决方案--------------------
赶紧结贴吧

------解决方案--------------------
Java code

String time = new String("2011_09_14_15_58_28");
        SimpleDateFormat a = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss");
        try {
            Date date = a.parse(time);
            System.out.println("将字符串转化为时间是" + date);
        } catch (ParseException e) {
            throw new RuntimeException("");
        }

------解决方案--------------------
Java code

public static void main(String[] args) {
     String a = "2011_09_14_15_58_28";
     String b = a.substring(0, 10).replace('_', '-') + " " + a.substring(11).replace('_', ':');
     System.out.println(b);
     }