JAVA快速功能

 1 1、日期格式化
 2 Date date=new Date();
 3 //转换成时间格式12小时制
 4 SimpleDateFormat df_12=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
 5 
 6 //转换成时间格式24小时制
 7 SimpleDateFormat df_24=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 8 
 9 System.out.println("12小时制时间::"+df_12.format(date));
10 System.out.println("24小时制时间::"+df_24.format(date));
11 
12 
13 2、过滤文件名非法字符
14 private static Pattern FilePattern = Pattern.compile("[\\/:*?"<>|]");  
15 public static String filenameFilter(String str) {  
16     return str==null?null:FilePattern.matcher(str).replaceAll("");  
17 }  
18 
19 3、读取文件内容
20 public static String readFile(String filePath) throws Exception{
21     File file = new File(filePath);
22     BufferedReader in = null;
23     String result = "";
24     String str = "";
25     try {
26         in = new BufferedReader(new FileReader(file));
27         while((str = in.readLine()) != null){
28             result += str;
29     }
30         in.close();
31     } catch (Exception e) {
32         e.printStackTrace();
33     }
34     return result;
35 }
36