1  /**//*
2 * StringUtils.java
3 * Copyright (C) 2007-3-19 <JustinLei@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16 package org.lambdasoft.utils;
17
18import java.text.SimpleDateFormat;
19import java.util.ArrayList;
20import java.util.Date;
21import java.util.List;
22import java.util.StringTokenizer;
23
24import org.apache.commons.logging.Log;
25import org.apache.commons.logging.LogFactory;
26
27/** *//**
28 * 字符串處理工具
29 *
30 * @author TangLei <justinlei@gmail.com>
31 * @date 2008-11-22
32 */
33public class StringUtils  {
34 private final static Log log = LogFactory.getLog(StringUtils.class);
35  private StringUtils(){}
36
37 /** *//**
38 * 判斷字符串是否為空
39 *
40 * @param str 需要判斷的字符串
41 * @return booleanValue 返回是否為空
42 */
43 public final static boolean isEmpty(String str) {
44 if(str == null)
45 return true;
46 str = str.trim();
47 if(str.length() == 0)
48 return true;
49 return false;
50 }
51
52 /** *//**
53 * 判斷字符串是否為空
54 *
55 * @param str 需要判斷的字符串
56 * @return booleanValue 返回是否為空
57 */
58 public final static boolean isNotEmpty(String str) {
59 return ! isEmpty(str);
60 }
61
62 public final static long getLength(String str) {
63 if(isEmpty(str))
64 return 0;
65 return str.trim().length();
66 }
67
68 /** *//**
69 * 獲取分割的字符串
70 *
71 * @param str 需要分割的字符串
72 * @param segment 分割字符串
73 * @return segments 分割好的字符串數組
74 */
75 public final static String[] getStringSegment(String str,String segment) {
76 if(str == null || str.trim().length() == 0)
77 return null;
78 if(segment == null || segment.length() == 0)
79 return null;
80 StringTokenizer stringTokenizer = new StringTokenizer(str,segment);
81 List<String> segs = new ArrayList<String>();
82 while(stringTokenizer.hasMoreTokens()) {
83 String _token = stringTokenizer.nextToken();
84 segs.add(_token);
85 if(log.isDebugEnabled()) {
86 log.debug("StringTokenizer.nextToken : " + _token);
87 }
88 }
89 String[] returns = new String[segs.size()];
90 for (int i = 0; i < segs.size(); i++) {
91 returns[i] = segs.get(i);
92 }
93 return returns;
94 }
95
96 /** *//**
97 * 時間格式化默認為(yyyy-MM-dd HH:mm:ss)
98 *
99 * @param date
100 * @param expression
101 * @return
102 */
103 public static final String formatDate(Date date,String expression) {
104 if(isEmpty(expression))
105 expression = "yyyy-MM-dd HH:mm:ss";
106 SimpleDateFormat sdf = new SimpleDateFormat(expression);
107 return sdf.format(date);
108 }
109}
110
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