如何以相反順序打印字符串數據？

Question

HI我試圖打印字符串中revrse順序，我在jsp頁面中的日誌文件的編碼是什麼樣子，

[1322110800] LOG ROTATION: DAILY 
[1322110800] LOG VERSION: 2.0 
[1322110800] CURRENT HOST STATE:arsalan.hussain;DOWN;HARD;1;CRITICAL - Host Unreachable (192.168.1.107) 
[1322110800] CURRENT HOST STATE: localhost;UP;HARD;1;PING OK - Packet loss = 0%, RTA = 0.06 ms 
[1322110800] CURRENT HOST STATE: musewerx-72c7b0;UP;HARD;1;PING OK - Packet loss = 0%, RTA = 0.27 ms 

代碼，

List<String> data = new LinkedList<String>(); 
    String strpath="/var/nagios.log"; 
FileReader fr = new FileReader(strpath); 
BufferedReader br = new BufferedReader(fr); 
    String ch; 
    int time=0; 
    String Conversion=""; 
    do { 
     ch = br.readLine(); 
Conversion=String.valueOf(inf.stringToLong(ch)); 
     Date d = new Date(Long.valueOf(Conversion)); 
    Pattern pt = Pattern.compile("\\[(\\d+)\\]"); 
    Matcher m = pt.matcher(ch); 
    if (m.find()) { 
    Date dt = new Date(Long.parseLong(m.group(1)) * 1000); 
    SimpleDateFormat sdf = new SimpleDateFormat("MM-dd-yyyy HH:mm:ss"); 
    ch = m.replaceFirst('['+ sdf.format(dt) +']'); 
    } 
out.print(ch+"<br/>"); 
} while (ch != null); 
    fr.close(); 

然後我嘗試了加入這個在我的代碼，

String[] arr=ch.split("\\["); 
    time=arr.length; 
    for(int num=time;num>=0;num--) 
    { 
    out.print(arr[num]+"<br/>"); 
    } 

現在上面的代碼看起來像添加此代碼後

List<String> data = new LinkedList<String>(); 
    String strpath="/var/nagios.log"; 
FileReader fr = new FileReader(strpath); 
BufferedReader br = new BufferedReader(fr); 
    String ch; 
    int time=0; 
    String Conversion=""; 
    do { 
     ch = br.readLine(); 
Conversion=String.valueOf(inf.stringToLong(ch)); 
     Date d = new Date(Long.valueOf(Conversion)); 
    Pattern pt = Pattern.compile("\\[(\\d+)\\]"); 
    Matcher m = pt.matcher(ch); 
    if (m.find()) { 
    Date dt = new Date(Long.parseLong(m.group(1)) * 1000); 
    SimpleDateFormat sdf = new SimpleDateFormat("MM-dd-yyyy HH:mm:ss"); 
    ch = m.replaceFirst('['+ sdf.format(dt) +']'); 
    } 
    String[] arr=ch.split("\\["); 
    time=arr.length; 
    for(int num=time;num>=0;num--) 
    { 
    out.print(arr[num]+"<br/>"); 
    } 
//out.print(ch+"<br/>"); 
} while (ch != null); 
    fr.close(); 

但結果是JSP中的異常???

的希望您回覆

問候

Answer 1

time=arr.length; 
for(int num=time;num>0;num--) 
{ 
    out.print(arr[num-1]+"<br/>"); 
}