将输出流OutputStream转化为输入流InputStream的方法

港控/mmm° 2023-01-02 04:27 686阅读 0赞

# 将输出流OutputStream转化为输入流InputStream的方法： #

## 1、ByteArrayOutputStream转成ByteArrayInputStream ##

*  **用于把OutputStream 转化为 InputStream。  **
 *  **适合于数据量不大，且内存足够全部容纳这些数据的情况。  **

ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    
    byteArrayOutputStream.write("hello,world!!!\n".getBytes());
    byteArrayOutputStream.write("hello,China!!!\n".getBytes());
    
    ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());
    
    int length = -1;
    byte [] buffer = new byte[1024 * 1024];
    while ((length = byteArrayInputStream.read(buffer))!=-1){
          System.out.println(new String(buffer,0,length));
    }
            
    byteArrayInputStream.close();
    byteArrayOutputStream.close();

## 2、PipedOutputStream转成PipedInputStream ##

*  **用于把OutputStream 转化为 InputStream。 **
 *  **适合于数据量大的情况，一个类专门负责产生数据，另一个类负责读取数据。 **

PipedInputStream pipedInputStream = new PipedInputStream();
    PipedOutputStream pipedOutputStream = new PipedOutputStream(pipedInputStream);
    BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(pipedOutputStream);
    
    bufferedOutputStream.write("hello,world!!!".getBytes());
    bufferedOutputStream.flush();
    byte [] buffer = new byte[10240];
    
    int length = pipedInputStream.read(buffer);
    
    System.out.println(new String(buffer,0,length));