在一些项目中可能需要对一段字符串中的单词进行统计，我在这里写了一个简单的demo，有需要的同学可以拿去看一下。
本人没怎么写个播客，如果有啥说的不对的地方，欢迎大家指正。
查询指定字符串出现次数可以直接使用：StringUtils.countMatches(str, sub)
统计所有单词出现次数代码：
/** * 统计各个单词出现的次数 * @param text */ public static void findEnglishNum(String text){ //找出所有的单词 String[] array = {".", " ", "?", "!"}; for (int i = 0; i < array.length; i++) { text = text.replace(array[i],","); } String[] textArray = text.split(","); //遍历 记录 Map<String, Integer> map = new HashMap<String, Integer>(); for (int i = 0; i < textArray.length; i++) { String key = textArray[i]; //转为小写 String key_l = key.toLowerCase(); if(!"".equals(key_l)){ Integer num = map.get(key_l); if(num == null || num == 0){ map.put(key_l, 1); }else if(num > 0){ map.put(key_l, num+1); } } } //输出到控制台 System.out.println("各个单词出现的频率为："); Iterator<String> iter = map.keySet().iterator(); while(iter.hasNext()){ String key = iter.next(); Integer num = map.get(key); System.out.println(key + "\n\t\t" + num + "次\n-------------------"); } }
测试代码：
public static void main(String[] args) { String text = "Welcome welcome to ADempiere, a commons-based peer-production of Open Source ERP Applications. This Wiki is for the global community to contribute and share know-how and domain expertise. We hope you can find as much open information and participate in making it most usable for everyone. This project has a bazaar of Citizens with a Community Council Team which work in theFunctional Team and Technical Team along the Software Development Procedure supported and funded by the foundation ADempiere"; findEnglishNum(text); }
运行结果：
后面还有一些没有全部截下来
本人代码功力不够深厚，如果代码中有什么不对或不好的地方，欢迎各位大神指点！