java一行一行读入数据

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import java.io.BufferedReader;import java.io.File;import java.io.FileReader;import java.io.IOException ;public class txt {    public static void readFileByLines(String fileName) {        File file = new File(fileName);        BufferedReader reader = null;        try {            System.out.println("以行为单位读取文件内容，一次读一行");            reader = new BufferedReader(new FileReader(file));            String tempString = null;            int line = 1;//一次读一行，读入null时文件结束            while ((tempString = reader.readLine()) != null) {//把当前行号显示出来                System.out.println("line " + line + ": " + tempString);                line++;            }            reader.close();        } catch (IOException e) {            e.printStackTrace();        } finally {            if (reader != null) {                try {                    reader.close();                } catch (IOException e1) {                }            }        }    }    public static void main(String argv[]) {        String filePath = "f:TOTAL.txt";        readFileByLines(filePath);    }}

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