下载指定url的图片

public static void getImg(String urlPath , String savePath) throws Exception {//获取图片                URL url = new URL(urlPath);        HttpURLConnection conn = (HttpURLConnection) url.openConnection();        conn.setConnectTimeout(6*1000);  // 注意要设置超时，设置时间不要超过10秒，避免被android系统回收        if (conn.getResponseCode() != 200) throw new RuntimeException("请求url失败");        InputStream inSream = conn.getInputStream();        //把图片保存到项目的根目录        readAsFile(inSream, new File(savePath));                     }  public static void readAsFile(InputStream inSream, File file) throws Exception{//is 到 file转换        FileOutputStream outStream = new FileOutputStream(file);        byte[] buffer = new byte[1024];        int len = -1;        while( (len = inSream.read(buffer)) != -1 ){            outStream.write(buffer, 0, len);        }         outStream.close();        inSream.close();    }