JAVA 字符串格式化,该怎么解决_J2SE

JAVA 字符串格式化
例如有文本文件111.txt里的内容是
20060603
20070503
20080208

现在要把它格式化成

2006-06-03
2007-05-03
2008-02-08

新手，请多指教，高手帮忙哦~~~~~~

------解决方案--------------------
这个简单，要么使用日期格式化方法。要么简单一点，直接使用字符串处理。

str.substring(0,4)+"-"+str.substring(4,6)+"-"+str.substring(6)
------解决方案--------------------
String str =20060607
str = str.substring(0,4)+"-"+str.substring(5,6)+"-"+str.substring(7,8)
------解决方案--------------------

Java code

String str =fdsaf2006060743242 Pattern p = Pattern.compile("[1-2][0-9]{3}[0-1][0-9][0-3][0-9]?", Pattern.CASE_INSENSITIVE); Matcher m = p.matcher(ss); while (m.find()) {  String s = m.group();  String y = s.substring(0, 4);  String mon = s.substring(4, 6);  String date = s.substring(6, 8);  s = y + "-" + mon + "-" + date;        }    }
------解决方案--------------------
Java code    public static String formatDateStr(String src)    {        SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");        String ret = "";                try        {            Calendar calendar = Calendar.getInstance();            calendar.setTime(format.parse(src.trim()));            int year = calendar.get(Calendar.YEAR);            int month = calendar.get(Calendar.MONTH) + 1;            int day = calendar.get(Calendar.DAY_OF_MONTH);            ret = year + "-" + (month < 10? "0" + month: month) + "-" + (day < 10? "0" + day: day);        }        catch(ParseException e)        {            e.printStackTrace();        }                return ret;    }
------解决方案--------------------
探讨
引用:
Java codepublicstaticvoidmain(String[] args) { 
        System.out.println(formatString("20060603")); 
        System.out.println(formatString("20070503")); 
        System.out.println(formatString("20080208")); 
    }publicstaticString formatString(String value) {returnvalue.replaceAll("(? <=[1-9])0(?!0)","-0"); 
    } 
 
如果是20080412,20081101,20081111, 
…