package com.gxhj.safecommunity.gat1400.utils;

import com.gxhj.core.exception.BusinessException;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

public class ImageUtils {
    /**
     * 通過url獲取圖片寬和高
     * @param picUrl
     * @return
     */
    public static Map<String, Integer> getPictureHeightAndWidthMap(String picUrl) {
        Map<String, Integer> map = new HashMap();
        try {
            URL url = new URL(picUrl);
            HttpURLConnection connection = (HttpURLConnection) url
                    .openConnection();
            DataInputStream in = new DataInputStream(
                    connection.getInputStream());
            BufferedImage image = ImageIO.read(in);
            map.put("w", image.getWidth());
            map.put("h", image.getHeight());
            connection.disconnect();
            in.close();
        } catch (IOException e) {
            throw new BusinessException("圖片IO流獲取出現(xiàn)異常:"+e);
        }
        return map;
    }


    /**
     * 根據(jù)url獲取圖片格式
     * @param picUrl
     * @return
     */
    public static String getImageType(String picUrl) {
        String headerField = null;
        try {
            URL url = new URL(picUrl);
            HttpURLConnection connection = (HttpURLConnection) url
                    .openConnection();
            headerField  = connection.getHeaderField("Content-Type");
            connection.disconnect();
        } catch (IOException e) {
            throw new BusinessException("圖片IO流獲取出現(xiàn)異常:"+e);
        }

        return headerField;
    }

}