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【Java】读取大图片的分辨率

作者:远方bruce / 发布于2014/1/6/ 381

package com.ImageStore.util;

import java.awt.Dimension;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.FileImageInputStream;
import javax.imageio.stream.ImageInputStream;

public class ReadImage {
 /**
  * 获取图片的分辨率
  * @param path
  * @return
  */
 public static Dimension getImageDim(String path) {
  Dimension result = null;
  String suffix = getFileSuffix(path);
  Iterator<ImageReader> iter = ImageIO.getImageReadersBySuffix(suffix);
  if (iter.hasNext()) {
   ImageReader reader = iter.next();
   try {
    ImageInputStream stream = new FileImageInputStream(new File(
      path));
    reader.setInput(stream);
    int width = reader.getWidth(reader.getMinIndex());
    int height = reader.getHeight(reader.getMinIndex());
    result = new Dimension(width, height);
   } catch (IOException e) {

   } finally {
    reader.dispose();
   }
  } else {
  }
  return result;
 }

 private static String getFileSuffix(final String path) {
  String result = null;
  if (path != null) {
   result = "";
   if (path.lastIndexOf('.') != -1) {
    result = path.substring(path.lastIndexOf('.'));
    if (result.startsWith(".")) {
     result = result.substring(1);
    }
   }
  }
  return result;
 }

 /**
  *
  * @param path
  *      读取图片路径
  * @return
  */
 public static String getResolution(String path) {
  String s = getImageDim(path).toString();
  s = s.substring(s.indexOf("[") + 1, s.indexOf("]"));
  String w = s.substring(s.indexOf("=") + 1, s.indexOf(","));
  String h = s.substring(s.lastIndexOf("=") + 1);
  return w + " x " + h;
 }

}

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