1) 首先,如果要使用BufferedWriter,一定会要用到FileWriter
毕竟它是以FileWriter为parameter(参数)的!
2) 使用的BufferedWriter的效率要比FileWriter高很多
原因很简单,前者有效的使用了缓存器
将缓存写满以后(或者close以后)才输出到文件中
(也就是忘记close的话,文件是没有写入的!)
3)记得先开的后关!否则会报异常!!!!
package diu;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class Test {
public static void main(String[] args) throws IOException {
File f = new File("D:/1.txt");
FileWriter r = new FileWriter(f);
BufferedWriter b = new BufferedWriter(r);
b.write("nihao");
r.close();
b.close();
}
}
这里先开的先close了
会有异常
Exception in thread "main" java.io.IOException: Stream closed
at sun.nio.cs.StreamEncoder.ensureOpen(Unknown Source)
at sun.nio.cs.StreamEncoder.write(Unknown Source)
at java.io.OutputStreamWriter.write(Unknown Source)
at java.io.BufferedWriter.flushBuffer(Unknown Source)
at java.io.BufferedWriter.close(Unknown Source)
at diu.Test.main(Test.java:19)