day19/StreamCopyPic.java

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/*复制一个图片。思路：1.用字节读取流对象和图片相关联。2.用字节写入流对象创建一个图片文件，用于存储获取到的图片数据。3.通过循环读写，完成数据的存储。4.关闭资源。*/import java.io.*;class StreamCopyPic {public static void main(String[] args) {copyPic();}public static void copyPic(){FileOutputStream fos = null;FileInputStream fis = null;try{fos = new FileOutputStream("E:\\javademo\\day19\\2.bmp");fis = new FileInputStream("E:\\javademo\\day19\\1.bmp");byte[] buf = new byte[1024];int len=0;while((len=fis.read(buf))!=-1){fos.write(buf,0,len);}}catch (Exception e){throw new RuntimeException("复制文件失败");}finally{try{if(fis!=null)fis.close();}catch (Exception e){throw new RuntimeException("读取文件失败");}try{if(fos!=null)fos.close();}catch (Exception e){throw new RuntimeException("写入文件失败");}}}}

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