split方法拆分字符串

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使用split()时应注意检查最后一个分隔符后面有无内容，否则最终分割出的数组元素个数有可能与预期得到的个数不相符，导致异常！String str = ",1,2,,";String[] list1 = str.split(",");String[] list2 = str.split(",",-1);String[] list3 = StringUtils.split(str,",");String[] list4 = StringUtils.splitPreserveAllTokens(str,",");System.out.println("字符串str:" + str);System.out.println("str.split(\",\")截取后数组元素个数：" + str.split(",").length);//末尾分隔符全部忽略for (String str1 : list1) {    System.out.println("\"" + str1 + "\"");//末尾分隔符全部忽略}System.out.println("str.split(\",\",-1)截取后数组元素个数：" + str.split(",",-1).length);//不忽略任何一个分隔符for (String str1 : list2) {    System.out.println("\"" + str1 + "\"");//末尾分隔符全部忽略}System.out.println("StringUtils.split(str,\",\")截取后数组元素个数：" + StringUtils.split(str,",").length);//最前面的和末尾的分隔符全部都忽略,apache commonsfor (String str1 : list3) {    System.out.println("\"" + str1 + "\"");//末尾分隔符全部忽略}System.out.println("StringUtils.splitPreserveAllTokens(str,\",\")截取后数组元素个数：" + StringUtils.splitPreserveAllTokens(str,",").length);//不忽略任何一个分隔符 apache commonsfor (String str1 : list4) {    System.out.println("\"" + str1 + "\"");//末尾分隔符全部忽略}

运行结果：

字符串str:,1,2,,str.split(",")截取后数组元素个数：3"""1""2"str.split(",",-1)截取后数组元素个数：5"""1""2"""""StringUtils.split(str,",")截取后数组元素个数：2"1""2"StringUtils.splitPreserveAllTokens(str,",")截取后数组元素个数：5"""1""2"""""

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