// 输入输出重定向
public static void PrintStreamDemo2(){
// 此刻直接输出到控制台
System.out.println("hello");
File file = new File(filepath);
try{
System.setOut(new PrintStream(new FileOutputStream(file)));
}catch(FileNotFoundException e){
e.printStackTrace();
}
System.out.println("这些内容在文件中才能看到哦！");
}
// 使用OutputStream向控制台输出内容
public static void OutputStreamDemo(){
try {
OutputStream out = System.out;
out.write("输出到控制台".getBytes());
out.close();
} catch (Exception e) {
}
}
14 BufferedReader
// bufferedReader 只接受字符输入流。
public static void BufferedReader1(){
// System.in 流转换成 字符输入流 InputStreamReader
BufferedReader br = new BufferedReader(
new InputStreamReader(System.in)
);
System.out.println("请输入内容:");
try {
String str = br.readLine();
System.out.println("你输入的内容是:"+str);
} catch (IOException e) {
e.printStackTrace();
}
}
15 Scanner
// 采用Scanner类来进行数据输入，
public static void ScannerDemo(){
Scanner scanner = new Scanner(System.in);
System.out.println("请输入内容:");
String str = scanner.nextLine();
System.out.println("你输入的内容是:"+str);
}
// Scanner 从文件中读取内容
// Scanner可以接受任何的输入流
public static void Scanner2(){
File file = new File(filepath);
try {
Scanner scanner = new Scanner(file);
String str = scanner.next();
System.out.println("文件中的内容为:"+str);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
16 数据操作流DataOutputStream、DataInputStream类
html"> //数据操作流DataOutputStream、DataInputStream类
public static void DataOutputStreamDemo(){
File file = new File(filepath);
char[] ch = {'A','B','C'};
try {
DataOutputStream ds = new DataOutputStream(new FileOutputStream(file));
for (char c : ch) {
ds.writeChar(c);
}
ds.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void DataInputStreamDemo(){
File file = new File(filepath);
try {
DataInputStream ds = new DataInputStream(new FileInputStream(file));
char[] ch = new char[3];
char c;
int len =0;
while((c=ds.readChar())!='C'){
ch[len] = c;
len++;
}
System.out.println(ch);
ds.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//DataInputStream.available()==0 判断到达文件末尾
17.合并流 SequenceInputStream
// 合并流 SequenceInputStreamDemo
public static void SequenceInputStreamDemo(){
File file1 = new File("d:" + File.separator + "hello1.txt");
File file2 = new File("d:" +