IO对文件的读写

package test;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

public class IoTest {

public static void main(String[] str) {
WriteData();// 写入文件
ReaderData();// 读取文件
}

private static void WriteData() {
OutputStream out = null;
try {
File file = new File("C:\\Users\\Administrator\\Desktop\\test.txt");
if (!file.exists()) {
file.createNewFile();
System.out.println("创建test文件");
}
out = new FileOutputStream(file);
byte[] by = new byte[1024];
String[] str = { "aaaaaa", "bbbbbbb", "ccccccccccccc", "ddddddddddd" };
StringBuilder sb = new StringBuilder();
for (int i = 0; i < str.length; i++) {
sb.append(str[i]);
}
by = sb.toString().getBytes();
out.write(by, 0, by.length);
System.out.println("写入的文件内容为：" + sb.toString());
} catch (IOException e) {
// TODO: handle exception
} finally {
try {
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

private static void ReaderData() {
InputStream in = null;
BufferedReader bfr = null;
try {
File file = new File("C:\\Users\\Administrator\\Desktop\\test.txt");
if (!file.exists()) {
file.createNewFile();
}
in = new FileInputStre
4000
am(file);
bfr = new BufferedReader(new InputStreamReader(in));
StringBuffer sb = new StringBuffer();
String line;
while ((line = bfr.readLine()) != null) {
sb.append(line);
}
bfr.close();
System.out.println("读取到文件的内容为:" + sb.toString());
} catch (Exception e) {
// TODO: handle exception
} finally {
try {
in.close();
bfr.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

}