Java核心类库-IO-字节数组流/内存流
内存流（数组流）：
把数据先临时存在数组中，待会再从数组中获取出来。
1. 字节内存流：ByteArrayInputStream/ByteArrayOutputStream
2. 字符内存流：CharArrayInputStream/CharArrayOutputStream
3. 字符串流：StringReader/StringWriter（把数据存放在数组中）
字节内存流：
public class ByteArrayDemo {
public static void main(java.lang.String[] args) throws Exception {
//字节数组输出流：程序到内存
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bos.write("ABCD".getBytes());
//使用存储的临时数据
byte[] buffer = bos.toByteArray();
//字节数组输入流：内存到程序
ByteArrayInputStream bis = new ByteArrayInputStream(buffer);
byte[] bys = new byte[1024];
int len = -1;
while ((len = bis.read(bys)) != -1) {
System.out.print(new java.lang.String(bys,0,len));
}
bos.close();
bis.close();
}
}
字符数组流：与字节操作大致相同。
字符串流：
1 public class StringWriterReaderDemo {
2 public static void main(String[] args) throws IOException {
3 //字符串的输出流
4 StringWriter stringWriter = new StringWriter();
5 stringWriter.write("你多大了？");
6 stringWriter.write("21岁！");
7
8 //字符串的输入流
9 StringReader stringReader = new StringReader(stringWriter.toString());
10 char[] buffer = new char[1024];
11 int len = -1;
12 while((len = stringReader.read(buffer)) != -1){
13 System.out.println(new String(buffer,0,len));
14 }
15 }
16 }
