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Dahua ICC Open API SDK for Java
There is a newer version: 1.0.13.7
/*
 * Copyright 2017 Baidu, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */
package com.dahuatech.icc.util;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.MemoryCacheImageInputStream;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;

/**
 * @author 232676
 * @since 1.0.0 2020-10-24 20:59:11
 */
public class ImageUtil {

  public static String getImageFormatByFile(String filePath) {
    ImageInputStream input = null;
    try {
      input = ImageIO.createImageInputStream(new File(filePath));
      return getImageFormat(input);
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      if (input != null) {
        try {
          input.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
    return "unknown";
  }

  public static String getImageFormatByBytes(byte[] content) {
    ImageInputStream input = null;
    try {
      input = new MemoryCacheImageInputStream(new ByteArrayInputStream(content));
      return getImageFormat(input);
    } finally {
      if (input != null) {
        try {
          input.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
  }

  /**
   * this function will not close input, need caller to close it.
   */
  public static String getImageFormat(ImageInputStream input) {
    Iterator readers = ImageIO.getImageReaders(input);
    String format = "unknown";
    if (readers.hasNext()) {
      ImageReader reader = readers.next();
      try {
        format = reader.getFormatName();
      } catch (IOException e) {
        e.printStackTrace();
      } finally {
        reader.dispose();
      }
    }

    return format;
  }

  public static HashMap getImageInfoByFile(String filePath) {
    ImageInputStream input;
    try {
      input = ImageIO.createImageInputStream(new File(filePath));
      return getImageInfo(input);
    } catch (IOException e) {
      e.printStackTrace();
    }
    return null;
  }

  public static HashMap getImageInfoByBytes(byte[] content) {
    ImageInputStream input = new MemoryCacheImageInputStream(new ByteArrayInputStream(content));
    return getImageInfo(input);
  }

  /**
   * this function will not close input, need caller to close it.
   */
  public static HashMap getImageInfo(ImageInputStream input) {
    HashMap map = new HashMap(2);

    BufferedImage buff = null;
    try {
      buff = ImageIO.read(input);
      map.put("width", buff.getWidth());
      map.put("height", buff.getHeight());
      return map;
    } catch (IOException e) {
      e.printStackTrace();
    } catch (Exception e) {
      e.printStackTrace();
    }

    return null;
  }
}