Question

如何用java读取文件并统计文件的大小写字母,数字,特殊字符的个数

Answer 1

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class Test {

public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new FileReader("c:/test.txt"));
StringBuilder sb = new StringBuilder();
while (true) {
String line = br.readLine();
if (line == null)
break;
sb.append(line);
}
br.close();
String content = sb.toString();
System.out.println("Character count is:" + (content.length() - content.replaceAll("[a-zA-Z]", "").length()));
System.out.println("Number count is:" + (content.length() - content.replaceAll("[0-9]", "").length()));
System.out.println("Special count is :" + content.replaceAll("[\\w ]", "").length());

}
}
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c盘下新建个test.txt文件，内容：
abc123!@#

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输出：
Character count is:3
Number count is:3
Special count is :3

Answer 2

把读取的内容转换为字符数据，然后判断每个字符的ASCII码值就可以知道是字母数字等，设置3个变量，是那种类型哪个变量+1