package com.maystar.utils;java
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;.net
import javax.imageio.ImageIO;debug
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;orm
/**
* <p>Title: ImageUtil </p>
* <p>Description: 使用JDK原生態類生成圖片縮略圖和裁剪圖片 </p>
* <p>Email: icerainsoft@hotmail.com </p>
* @author Ares
* @date 2014年10月28日 上午10:24:26
*/
public class ImageUtil {圖片
private Logger log = LoggerFactory.getLogger(getClass());
private static String DEFAULT_PREVFIX = "thumb_";
private static Boolean DEFAULT_FORCE = false;
/**
* <p>Title: thumbnailImage</p>
* <p>Description: 根據圖片路徑生成縮略圖 </p>
* @param imagePath 原圖片路徑
* @param w 縮略圖寬
* @param h 縮略圖高
* @param prevfix 生成縮略圖的前綴
* @param force 是否強制按照寬高生成縮略圖(若是爲false,則生成最佳比例縮略圖)
*/
public void thumbnailImage(File imgFile, int w, int h, String prevfix, boolean force){
if(imgFile.exists()){
try {
// ImageIO 支持的圖片類型 : [BMP, bmp, jpg, JPG, wbmp, jpeg, png, PNG, JPEG, WBMP, GIF, gif]
String types = Arrays.toString(ImageIO.getReaderFormatNames());
String suffix = null;
// 獲取圖片後綴
if(imgFile.getName().indexOf(".") > -1) {
suffix = imgFile.getName().substring(imgFile.getName().lastIndexOf(".") + 1);
}// 類型和圖片後綴所有小寫,而後判斷後綴是否合法
if(suffix == null || types.toLowerCase().indexOf(suffix.toLowerCase()) < 0){
log.error("Sorry, the image suffix is illegal. the standard image suffix is {}." + types);
return ;
}
log.debug("target image's size, width:{}, height:{}.",w,h);
Image img = ImageIO.read(imgFile);
if(!force){
// 根據原圖與要求的縮略圖比例,找到最合適的縮略圖比例
int width = img.getWidth(null);
int height = img.getHeight(null);
if((width*1.0)/w < (height*1.0)/h){
if(width > w){
h = Integer.parseInt(new java.text.DecimalFormat("0").format(height * w/(width*1.0)));
log.debug("change image's height, width:{}, height:{}.",w,h);
}
} else {
if(height > h){
w = Integer.parseInt(new java.text.DecimalFormat("0").format(width * h/(height*1.0)));
log.debug("change image's width, width:{}, height:{}.",w,h);
}
}
}
BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics g = bi.getGraphics();
g.drawImage(img, 0, 0, w, h, Color.LIGHT_GRAY, null);
g.dispose();
String p = imgFile.getPath();
// 將圖片保存在原目錄並加上前綴
ImageIO.write(bi, suffix, new File(p.substring(0,p.lastIndexOf(File.separator)) + File.separator + prevfix +imgFile.getName()));
} catch (IOException e) {
log.error("generate thumbnail image failed.",e);
}
}else{
log.warn("the image is not exist.");
}
}
public void thumbnailImage(String imagePath, int w, int h, String prevfix, boolean force){
File imgFile = new File(imagePath);
thumbnailImage(imgFile, w, h, prevfix, force);
}
public void thumbnailImage(String imagePath, int w, int h, boolean force){
thumbnailImage(imagePath, w, h, DEFAULT_PREVFIX, force);
}
public void thumbnailImage(String imagePath, int w, int h){
thumbnailImage(imagePath, w, h, DEFAULT_FORCE);
}
public static void main(String[] args) {
new ImageUtil().thumbnailImage("D:/DSC01145.JPG", 20, 99);
}ip
}ci