Question

请问，用java，如何从文件中读入我指定长度的字符串？谢谢！

Answer 1

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

public class ReadFileByLength {

/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {

String file = "test.txt";//文件

final int length = 1000;//指定的长度

StringBuilder sb = new StringBuilder();

BufferedReader bf = new BufferedReader(new FileReader(file));

while(sb.length() <= length){
String content = bf.readLine();

if(content == null){
break;
}
sb.append(content);
}

bf.close();

String expectedStr = sb.substring(0, length).toString();

System.out.println("The string you want is: " + expectedStr);
}

}

Answer 2

将文件中的内容以空格和换行符分割 判断每个的长度