通过java的i/o机制进行图片流的存储以及对网络图片的存储

存储内地图片思路：首先把原有的图片以流的方式读取出来，再以流的方式存储到目标文件：

package imgStream;

import java.io.*;

public class ImgStream {
    public static void main(String srga[]) {
        File source = new File("user.jpg");
        File desk = new File("G:\learn\javademoS\imgs");
        if (!desk.exists()) {
            desk.mkdir();
        }
        try {
            FileInputStream inputStream = new FileInputStream(source);
            FileOutputStream outputStream = new FileOutputStream(new File("G:\learn\javademoS\imgs\fang.jpg"));
            int ch = inputStream.read();
            while (ch != -1) {//当流结束时返回-1
                outputStream.write(ch);
                ch = inputStream.read();
            }
            inputStream.close();
            outputStream.close();
            System.out.println("写入流成功");
        } catch (FileNotFoundException e) {
            System.out.println("文件不存在：" + e.getMessage());
        } catch (IOException e) {
            System.out.println("文件读取错误：" + e.getMessage());
        }
    }
}

　

存储网络图片思路：构造一个url，然后请求网络数据，然后再以流的方式写到文件当中：

package imgStream;

import java.net.URL;
import java.net.URLConnection;

import java.io.*;

public class ImgStreamS {

    private static void system() throws Exception {
        String path = "http://ui.51bi.com/opt/siteimg/images/fanbei0923/Mid_07.jpg";
        //构造URL
        URL url = new URL(path);

        //打开连接
        URLConnection con = url.openConnection();
        //请求时间
        con.setConnectTimeout(4*1000);
        //输入流
        InputStream is = con.getInputStream();
        //1K的数据缓冲
        byte[] bs=  new byte[1024];
        //数据长度
        int len;
        //输出的文件流
        File sf = new File("G:\learn\javademos\imgs");
        if(!sf.exists()){
            sf.mkdirs();
        }
        OutputStream os = new FileOutputStream(sf.getPath()+"\test.jpg");
        //开始读取
        while((len = is.read(bs)) != -1){
            os.write(bs,0,len);
        }
        //关闭所有连接
        os.close();
        is.close();
    }

    public static void main(String args[]) throws Exception {
        ImgStreamS imgStream = new ImgStreamS();
       
        system();
    }
}