imgutil.java

大象购物系统

package com.comm.util;

import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.text.*;
import java.util.*;

import javax.imageio.*;
import javax.swing.*;

import com.sun.image.codec.jpeg.*;

public class ImgUtil {

    private BufferedImage bimage;
    private int width;
    private int height;

    public ImgUtil() {}

    public ImgUtil(String filename) {
        try {
            bimage = ImageIO.read(new File(filename));
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
        height = bimage.getHeight();
        width = bimage.getWidth();
    }

    public void makeThumbnail(String filename, int maxWidth, int maxHeight) throws
            IOException {
        double scale = cScale(width, height, maxWidth, maxHeight);
        BufferedImage bimage2 = new BufferedImage((int) ((double) width * scale),
                                                  (int) ((double) height *
                scale), 1);
        Graphics2D g2d = (Graphics2D) bimage2.getGraphics();
        g2d.scale(scale, scale);
        g2d.drawImage(bimage, 0, 0, new Frame());
        ImageIO.write(bimage2, "jpg", new File(filename));

//        System.out.println("in makeThumbnail");

//        double scale = cScale(width, height, maxWidth, maxHeight);
//        Image Itemp = bimage.getScaledInstance(maxWidth, maxHeight,
//                                               bimage.SCALE_SMOOTH);
//        System.out.println("after getScaledInstance");
//        AffineTransformOp op = new AffineTransformOp(AffineTransform.
//                getScaleInstance(scale, scale), null);
//        Itemp = op.filter(bimage, null);
//        ImageIO.write((BufferedImage) Itemp, "jpg", new File(filename));
    }

    public static double cScale(int w, int h, int maxWidth, int maxHeight) {
        double scale = 1.0D;
        scale = (double) maxWidth / (double) w >=
                (double) maxHeight / (double) h ?
                (double) maxHeight / (double) h :
                (double) maxWidth / (double) w;
        return scale;
    }

    public int getHeight() {
        return height;
    }

    public int getWidth() {
        return width;
    }

    public static String noNull(String p) {
        return p != null ? p.trim() : "";
    }

    public static String getCurrentDate(Date d) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        return sdf.format(d);
    }

    public static int parseInt(String p, int d) {
        int result = d;
        if (p != null) {
            try {
                result = Integer.parseInt(p.trim());
            } catch (Exception e) {}
        }
        return result;
    }

    //生成缩略图
    public void reduce(String srcFileName, String tagFileName, int maxWidth,
                       int maxHeight) {
        //设置新文件的宽和高

        ImageIcon srcFile = new ImageIcon(srcFileName); //读入源文件
        double scale = cScale(srcFile.getIconWidth(), srcFile.getIconHeight(),
                              maxWidth, maxHeight);
        int tagImageWidth = (int) ((double) srcFile.getIconWidth() * scale);
        int tagImageHeight = (int) ((double) srcFile.getIconHeight() * scale);
        Image srcImage = srcFile.getImage(); //构造Image对象
        BufferedImage tagImage = new BufferedImage(tagImageWidth,
                tagImageHeight, BufferedImage.TYPE_INT_RGB); //构造图像缓存对象
        tagImage.getGraphics().drawImage(srcImage, 0, 0, tagImageWidth,
                                         tagImageHeight, null); //绘制缩小后的图
        paint(tagImage, tagFileName);
    }

    //生成水印
    public void watermark(String srcFileName, String logoFileName, String text,
                          int watermarkLocationX, int watermarkLocationY,
                          int wordLocationX, int wordLocationY) {
        Color color = Color.BLACK; //前景色
        Color backgroundColor = Color.WHITE; //背景色

        ImageIcon srcFile = new ImageIcon(srcFileName); //读入源文件
        Image srcImage = srcFile.getImage(); //构造Image对象
        ImageIcon watermarkFile = new ImageIcon(logoFileName); //读入水印文件
        Image watermarkImage = watermarkFile.getImage(); //构造水印图片对象
        BufferedImage tagImage = new BufferedImage(srcImage.getWidth(null),
                srcImage.getHeight(null), BufferedImage.TYPE_INT_RGB); //构造图像缓存对象

        Graphics2D g = tagImage.createGraphics();
        g.setColor(color); //设置绘图笔的前景色
        g.setBackground(backgroundColor); //设置绘图笔的背景色
        g.drawImage(srcImage, 0, 0, null); //先绘制源图
        g.drawImage(watermarkImage, watermarkLocationX, watermarkLocationY, null); //添加水印图片
        g.drawString(text, wordLocationX, wordLocationY); //添加文字
        g.dispose();
        paint(tagImage, srcFileName);
    }

    //生成水印
    public void watermark2(String srcFileName, String logoFileName, String text,
                           int watermarkLocationX, int watermarkLocationY,
                           int wordLocationX, int wordLocationY) {
        Color color = Color.BLACK; //前景色
        Color backgroundColor = Color.WHITE; //背景色

        ImageIcon srcFile = new ImageIcon(srcFileName); //读入源文件
        Image srcImage = srcFile.getImage(); //构造Image对象
        ImageIcon watermarkFile = new ImageIcon(logoFileName); //读入水印文件
        int w = watermarkFile.getIconWidth();
        int h = watermarkFile.getIconHeight();
        if (w < 140) {
            watermarkLocationX = (140 - w) / 2;
            watermarkLocationY = 0;
        } else {
            watermarkLocationX = 0;
            watermarkLocationY = (140 - h) / 2;
        }
        Image watermarkImage = watermarkFile.getImage(); //构造水印图片对象
        BufferedImage tagImage = new BufferedImage(srcImage.getWidth(null),
                srcImage.getHeight(null), BufferedImage.TYPE_INT_RGB); //构造图像缓存对象

        Graphics2D g = tagImage.createGraphics();
        g.setColor(color); //设置绘图笔的前景色
        g.setBackground(backgroundColor); //设置绘图笔的背景色
        g.drawImage(srcImage, 0, 0, null); //先绘制源图
        g.drawImage(watermarkImage, watermarkLocationX, watermarkLocationY, null); //添加水印图片
        g.drawString(text, wordLocationX, wordLocationY); //添加文字
        g.dispose();
        paint(tagImage, logoFileName);
    }

    private void paint(BufferedImage tagImage, String tagFilename) {
        try {
            FileOutputStream tagFile = new FileOutputStream(tagFilename);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(tagFile);
            JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(tagImage);
            param.setQuality(50f, true);
            encoder.encode(tagImage, param);
            tagFile.close();
        } catch (Exception e) {}
    }
}