package com.xqy;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
//java 将图片的 url 转换成 File，File 转换成二进制流 byte
public class PictureUtils {
//将 Url 转换为 File
public static File UrltoFile(String url) throws Exception {
HttpURLConnection httpUrl = (HttpURLConnection) new URL(url).openConnection();
httpUrl.connect();
InputStream ins=httpUrl.getInputStream();
File file = new File(System.getProperty("java.io.tmpdir") + File.separator + "xie");//System.getProperty("java.io.tmpdir")缓存
if (file.exists()) {
file.delete();//如果缓存中存在该文件就删除
}
OutputStream os = new FileOutputStream(file);
int bytesRead;
int len = 8192;
byte[] buffer = new byte[len];
while ((bytesRead = ins.read(buffer, 0, len)) != -1) {
os.write(buffer, 0, bytesRead);
}
os.close();
ins.close();
return file;

    }
    //将File对象转换为byte[]的形式
    public static byte[] FileTobyte(File file){
        FileInputStream fileInputStream = null;
        byte[] imgData = null;

        try {

            imgData = new byte[(int) file.length()];

            //read file into bytes[]
            fileInputStream = new FileInputStream(file);
            fileInputStream.read(imgData);

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fileInputStream != null) {
                try {
                    fileInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        }
        return imgData;
    }

}