JAVA 字符串格式化

[linuxtoproot]

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~~~~~~

[joejoe1991]

	public static void main(String[] args) {
		System.out.println(formatString("20060603"));
		System.out.println(formatString("20070503"));
		System.out.println(formatString("20080208"));
	}

	public static String formatString(String value) {
		return value.replaceAll("(?<=[1-9])0(?!0)", "-0");
	}

[againlove]

[Quote=引用 8 楼 joejoe1991 的回复:]
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");
}
[/Quote]
如果是20080412,20081101,20081111,
returnvalue.replaceAll("(?<=[1-9])0(?!0)","-0"好像就不可以吧？？

[joejoe1991]

[Quote=引用 9 楼 againlove 的回复:]
引用 8 楼 joejoe1991 的回复:
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,
…
[/Quote]

忘了考虑这种情况了，呵呵，改成下面这样就好。

	public static void main(String[] args) {
		System.out.println(formatString("20060603"));
		System.out.println(formatString("20071103"));
		System.out.println(formatString("20081208"));
		System.out.println(formatString("20080108"));
	
	}

	public static String formatString(String value) {
		return value.replaceAll("(?<=[1-9])([01])(?!0)", "-$1");
	}

[linuxtoproot]

刚上网，看到这么多回贴，真是太感谢了，小弟第一次发贴求助，感动。。。

再次感谢大家

[lovingprince]

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)

[ZangXT]

自己读文件，每一条做如下变换：
public class Test{
public static void main(String[] args) {
String str="20080208";
StringBuilder builder=new StringBuilder(str);
builder.insert(4, "-");
builder.insert(7, "-");
str=builder.toString();
System.out.println(str);
}
}

[reality]

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

[daybybyby]

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;
		}
	}

[daybybyby]

晕， 少了个 m.replaceFirst(s)

[craky]

    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;
    }

[chensq82]

public static void main(String [] args)
{
String inputStr = "20090924";
DateFormat df = new SimpleDateFormat("yyyyMMdd");
DateFormat df2 = new SimpleDateFormat("yyyy-MM-dd");
try
{
Date date = df.parse(inputStr);
String outputString = df2.format(date);
System.out.println(outputString);
}
catch (ParseException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}

[chensq82]

public static String getDateStr(String inputStr)
{
String outputStr = null;
DateFormat df = new SimpleDateFormat("yyyyMMdd");
DateFormat df2 = new SimpleDateFormat("yyyy-MM-dd");
try
{
Date date = df.parse(inputStr);
outputStr = df2.format(date);
}
catch (ParseException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return outputStr;
}