【Java】IO操作之以图片地址下载图片

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以图片地址下载图片

读取给定图片文件的内容，用FileInputStream

public static byte[] mReaderPicture(String filePath) {byte[] arr = null;try {File file = new File(filePath);FileInputStream fReader = new FileInputStream(file);arr = new byte[1024*100];fReader.read(arr);} catch (Exception  e) {// TODO: handle exceptione.printStackTrace();}return arr;}

根据byte数组，创建一张新图。

public static void mWriterPicture(String newFileName,byte[] b){try {File file = new File(newFileName);FileOutputStream fStream = new FileOutputStream(file);fStream.write(b);fStream.close();System.out.println("图片创建成功    "+b.length);} catch (Exception e) {// TODO: handle exception}}

获取指定网址的图片，返回其byte[]

public static byte[] mReaderPictureToInternet(String strUr1){byte[] imgData = null;URL url;try {url = new URL(strUr1);URLConnection connection = url.openConnection();int length = (int)connection.getContentLength();InputStream is = connection.getInputStream();if (length!=-1) {imgData = new byte[length];byte[] temp = new byte[500*1024];int readLen = 0;int destPos = 0;while ((readLen = is.read(temp))>0) {System.arraycopy(temp, 0, imgData, destPos, readLen);//arraycopy(Object src, int srcPos, Object dest, int destPos, int length) //从指定源数组中复制一个数组，复制从指定的位置开始，到目标数组的指定位置结束destPos+=readLen;}}return imgData;} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return imgData;}

直接获取指定网址的图片

public static void DownPictureToInternet(String filePath,String strUr1){try {URL url = new URL(strUr1);InputStream fStream = url.openConnection().getInputStream();int b = 0;FileOutputStream fos = new FileOutputStream(new File(filePath));while ((b=fStream.read())!=-1) {fos.write(b);}fStream.close();fos.close();} catch (Exception e) {e.printStackTrace();}}

应用：

public static void main(String[] args) {mWriterPicture("test/1.jpg", mReaderPicture("res/me.jpg"));mWriterPicture("test/2.jpg", mReaderPictureToInternet("http://pic2.desk.chinaz.com/file/201209/7/qinghimingyue4_p.jpg"));DownPictureToInternet("test/下载.jpg","http://img3.100bt.com/upload/ttq/20130205/1360069663700.jpg");}

源码下载：

http://download.csdn.net/detail/oyuntaolianwu/5804447