Java中怎么将字符串按行写入到txt文件中

java写入文本文件的方法很多，比如FileWriter

    FileWriter fw = new FileWriter("D:/Test.txt")    

    String s = "hello world\n"    

    fw.write(s,0,s.length())   

    s = "hello world2\n"    

    fw.write(s,0,s.length())  

    fw.flush()

这样就写了两行了。其中斜线n是换行符

//读取

String pathName = "D:\\1.txt"

BufferedReader br = new BufferedReader(new FileInputStream(pathName))

String line = ""

while((line = br.readLine()) != null){

    System.out.println(line)

}

br.close()

//写入

BufferedWriter br = new BufferedWriter(new FileWriter(pathName))

br.write("要写入的内容")

br.flush() //刷新缓冲区的数据到文件

br.close()

试试这个： import java.io.BufferedReader import java.io.File import java.io.FileReader import java.io.IOException public class FileOpenTest { private int count = 0 private FileOpenTest(String filePath) { File f = new File(filePath) try { BufferedReader br = new BufferedReader(new FileReader(f)) while (br.ready()) { br.readLine() count ++ } } catch (IOException e) { e.printStackTrace() } } private int getCount() { return count } public static void main(String[] args) { String filePath = "D:\\test.txt"//文件本地路径 FileOpenTest fot = new FileOpenTest(filePath) System.out.println(fot.getCount()) } }

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