2.2 FileReader的用法
FileReader是Reader的继承类,从字面上就可看出,它的主要功能就是能从磁盘上读入文件。read方法会一个一个字符的从磁盘往回读数据。
例:2.2.1
import java.io.*;
public class TestMark_to_win {
public static void main(String args[]) throws Exception {
/*public int read()
throws IOException
Reads a single character.
Overrides:
read in class Reade
Returns:
The character read, or -1 if the end of the stream has been reached
Throws:
IOException - If an I/O error occurs */
int ii;
FileReader in = new FileReader("c:/1.txt");
while ((ii = in.read()) != -1) {
System.out.println(ii);
}
in.close();
FileReader in1 = new FileReader("c:/1.txt");
while ((ii = in1.read()) != -1) {
System.out.println((char)ii);
}
in1.close();
}
}
例:2.2.2(一个简单的拷贝方法,初学者方便理解)
import java.io.*;
public class TestMark_to_win {
public static void main(String[] args) throws IOException {
File inputFile = new File("c:/1.txt");
File outputFile = new File("c:/1_c.txt");
FileReader in = new FileReader(inputFile);
FileWriter out = new FileWriter(outputFile);
int c;
while ((c = in.read()) != -1)
out.write(c);
in.close();
out.close();
}
}
更多请见:https://blog.csdn.net/qq_44639795/article/details/102608738
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