文件读写中的inputStream和outputStream_asinputstream

InputStream(输入流）用来读取数据

OutputStream（输出流）用来写出数据

public int read();//从此输入流中读取一个数据字节

public int read(byte[] b);//从此输入流中将最多b.length个字节数据读取到byte数组中

public int read(byte b[]) throws IOException {
    Object traceContext = IoTrace.fileReadBegin(path);
    int bytesRead = 0;
    try {
        bytesRead = readBytes(b, 0, b.length);
    } finally {
        IoTrace.fileReadEnd(traceContext, bytesRead == -1 ? 0 : bytesRead);
    }
    return bytesRead;
}

public int read(byte[] b,int off,int len);//从此输入流中将最多 len 个字节的数据读入一个 byte 数组中。off:目标数组 b 中的起始偏移量。

public int read(byte b[], int off, int len) throws IOException {
    Object traceContext = IoTrace.fileReadBegin(path);
    int bytesRead = 0;
    try {
        bytesRead = readBytes(b, off, len);
    } finally {
        IoTrace.fileReadEnd(traceContext, bytesRead == -1 ? 0 : bytesRead);
    }
    return bytesRead;
}

package fileDo;
 
import java.io.FileInputStream;
 
/**
 * @auther **
 * @date 7/31/2018 3:02 PM
 */
public class FileReadStream {
    public static void main(String[] args){
        String content = null;
        try{
            int size = 0;
            //定义一个字节缓冲区，该缓冲区的大小根据需要来定义
            byte[] buffer = new byte[1024];
            FileInputStream fis = new FileInputStream("d:/read.txt");
            //循环读取文件中的数据
            while((size = fis.read(buffer)) != -1){
                content = new String(buffer, 0, size);
                System.out.println(content);
            }
            fis.close();
        }catch (Exception e){