Java操作图片问题，有经验者请~

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楼主【huangyangweiyue】截止到2008-07-09 15:16:09的历史汇总数据(不包括此帖)：
发帖的总数量:16                       发帖的总分数:300                      每贴平均分数:18
回帖的总数量:100                      得分贴总数量:15                       回帖的得分率:15%
结贴的总数量:16                       结贴的总分数:300
无满意结贴数:3                        无满意结贴分:100
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无满意结贴率:18.75 %               无满意结分率:33.33 %
敬礼!

没有人用Java处理过 BMP图片么？
http://www.cnblogs.com/toosuo/archive/2007/12/22/1010283.html
找了一篇相关的~~~就是没看懂 ~~~
高手指点下谢过~~

你可以先将bmp转成jpg格式，然后生成一个BufferedImage对象，之后获得对应的Graphics2D实例，然后通过它在图上画十字之后再用ImageIO.write命令将此BufferedImage保存成新的bmp文件。本来想跟你代码，但是现在我的bmp转jpg程序有点问题。

给点读写的BufferedImage这个的代码看看。。
没接触过。
谢过

换成byte[]?不会
只会在一张图片上加点东西，比如划个十字什么的
用bufferedImage.getGraphics().drawImage方法

ImageIcon imageIcon = new ImageIcon(bytes);
BufferedImage bufferedImage=
new BufferedImage(imageIcon.getIconWidth(),imageIcon.getIconHeight(),BufferedImage.TYPE_INT_RGB);
Graphics2D g=(Graphics2D)bufferedImage.getGraphics();

如何获得指定路径jpg图片的byte[] ImageIcon imageIcon = new ImageIcon(bytes);ls 这个bytes怎么传

FileInputStream in = new FileInputStream(filePath);
byte[] bytes = new byte[in.available()];
in.read(bytes);
in.close();

Toolkit toolkit = Toolkit.getDefaultToolkit();
image = toolkit.getImage(path);这个image 怎么转换成byte[];

private FileInputStream in = null;
private byte[] bytes;
private Image image = null;
public void getJPG(String path)
{
try {
in = new FileInputStream(path);
byte[] bytes = new byte[in.available()];
in.read(bytes);
in.close();

ImageIcon imageIcon = new ImageIcon(bytes);
BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(),imageIcon.getIconHeight(),BufferedImage.TYPE_INT_RGB);
Graphics2D g = (Graphics2D)bufferedImage.getGraphics();
//g.drawArc(x, y, width, height, startAngle, arcAngle)
g.drawImage(imageIcon, imageIcon.getIconWidth()/2, imageIcon.getIconHeight()/2, imageIcon.getIconHeight()/2, imageIcon.getIconWidth()/2, observer) } catch (FileNotFoundException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
} catch (IOException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
}

怎么去划个十字~~~~~拜托~~~~~

~~~无奈，现在想对指定的bmp图片操作~~ 。
指定了，不要jpg的。
不知道JAVA中有没有直接对BMP图片操作的?????

import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import javax.imageio.ImageIO;public class ImageEditor { public static void main(String[] args) throws Exception {
FileInputStream fis = new FileInputStream("yourImageFilePath");
FileOutputStream fos = new FileOutputStream("yourImageFilePath");
BufferedImage img = ImageIO.read(fis);
Graphics g = img.getGraphics();
g.drawLine(0, 0, 60, 60);
//你的其它绘图代码...
img.flush();
g.dispose();
ImageIO.write(img, "BMP", fos);
}}自己处理一下异常的捕获。

package jpg;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.*;
import java.awt.Image;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;public class GraJPG {

private FileInputStream in = null;
private FileOutputStream out = null;
private byte[] bytes;
private Image image = null;

public void getJPG(String path)
{
try {
in = new FileInputStream(path);
out = new FileOutputStream(path);
bytes = new byte[in.available()];
in.read(bytes);
in.close();

ImageIcon imageIcon = new ImageIcon(bytes);
BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(),imageIcon.getIconHeight(),BufferedImage.TYPE_INT_RGB);
Graphics g = bufferedImage.getGraphics();
g.drawLine(20, 20, 60, 60);
bufferedImage.flush();
//g.dispose();
ImageIO.write(bufferedImage, "BMP", out);

} catch (FileNotFoundException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
} catch (IOException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
}

}
public static void main(String args[]){
GraJPG graJPG = new GraJPG();
graJPG.getJPG("D:\\test.jpg");
}}Exception in thread "main" java.lang.IllegalArgumentException: Width (-1) and height (-1) cannot be <= 0
at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:999)
at java.awt.image.BufferedImage.<init>(BufferedImage.java:314)
at jpg.GraJPG.getJPG(GraJPG.java:26)
at jpg.GraJPG.main(GraJPG.java:44)
我在"D:\\test.jpg"路径下有图片，main方法以后图片的内容没了 ~~~~高手指点~~ waiting...

ImageIcon imageIcon = new ImageIcon(bytes);
BufferedImage bufferedImage=
new BufferedImage(imageIcon.getIconWidth(),imageIcon.getIconHeight(),BufferedImage.TYPE_INT_RGB);
Graphics2D g=(Graphics2D)bufferedImage.getGraphics();

ImageIcon imageIcon = new ImageIcon(bytes);
BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(),imageIcon.getIconHeight(),BufferedImage.TYPE_INT_RGB);
//BufferedImage image = new BufferedImage();
Graphics2D g = (Graphics2D) bufferedImage.getGraphics();
g.drawLine(0, 0, 20, 20);

bufferedImage.flush();
//g.dispose();
ImageIO.write(bufferedImage, "BMP", out);
没区别~~~还是图片里的内容没了~~~

package jpg;import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import javax.imageio.ImageIO;public class Test {    public static void main(String[] args) throws Exception {
        FileInputStream fis = new FileInputStream("D:\\test.bmp");
        FileOutputStream fos = new FileOutputStream("D:\\test.bmp");
        BufferedImage img = ImageIO.read(fis);
        Graphics g = img.getGraphics();
        g.drawLine(0, 0, 60, 60);
        //你的其它绘图代码...
        img.flush();
        g.dispose();
        ImageIO.write(img, "BMP", fos);
    }}
Exception in thread "main" java.lang.NullPointerException
at jpg.Test.main(Test.java:15)很无奈~~~~~图片里的内容没有了~~~~

找到问题~~~~~ 传.bmp图片不行~~~~ .jpg的可以。image.getWidth((ImageObserver))ImageObserver这个对象怎么传~~~~如何使用好似是图片观察者？？？知道Observer 观察者模式~~~这里怎么用？

BufferedImage   img   =   ImageIO.read(new   File(filePath));
int width = img.getWidth();
int h = img.getHeight();
Graphics2D   g   =(Graphics2D)img.getGraphics();
g.setPaintMode();
g.drawLine(0, h / 2, width, h / 2);
ImageIO.write(img,"bmp",new File(newfilePath));

用这个就行了。

LZ想的太麻烦了，用不着流的，这样处理下就行了，JPG，BMP什么的都行package com.util;import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import javax.imageio.ImageIO;public class Graph {    public void getJPG(String path)
    {
        try {
         File img = new File(path);
            BufferedImage bufferedImage = ImageIO.read(img);
            System.out.println(bufferedImage.getHeight());
            System.out.println(bufferedImage.getWidth());
            Graphics g = bufferedImage.getGraphics();
            g.drawLine(20, 20, 100, 100);
            bufferedImage.flush();
            g.dispose();
            ImageIO.write(bufferedImage, "bmp", img);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
    }

    }
    public static void main(String args[]){
     Graph Graph = new Graph();
     Graph.getJPG("D:\\test.bmp");
    }}

如何切割一张很大的图片？如100m；代码如下能切割小图片！
大图片报内存溢出！但改了jvm内存不报错了但不出图了！
* 图像切割
    *
    * @param srcImageFile
    *            源图像地址
    * @param descDir
    *            切片目标文件夹
    * @param destWidth
    *            目标切片宽度
    * @param destHeight
    *            目标切片高度
    */
    public static void cut(String srcImageFile, String descDir, int destWidth,
            int destHeight) {
        try {
            Image img;
            ImageFilter cropFilter;
            // 读取源图像
            System.out.println("正在加载图片请稍等....");
            BufferedImage bi = ImageIO.read(new File(srcImageFile));
            int srcWidth = bi.getWidth(); // 源图宽度
            int srcHeight =bi.getHeight();  // 源图高度
            if (srcWidth > destWidth && srcHeight > destHeight) {
                Image image = bi.getScaledInstance(srcWidth, srcHeight,
                        Image.SCALE_DEFAULT);
               // destWidth = 256; // 切片宽度
               // destHeight = 256; // 切片高度
                int cols = 0; // 切片横向数量
                int rows = 0; // 切片纵向数量
                // 计算切片的横向和纵向数量
                if (srcWidth % destWidth == 0) {
                    cols = srcWidth / destWidth;
                } else {
                    cols = (int) Math.floor(srcWidth / destWidth) + 1;
                }
                if (srcHeight % destHeight == 0) {
                    rows = srcHeight / destHeight;
                } else {
                    rows = (int) Math.floor(srcHeight / destHeight) + 1;
                }
                // 循环建立切片
                // 改进的想法:是否可用多线程加快切割速度
                int size=0;
                int num=rows*cols;
                for (int i = 0; i < rows; i++) {
                 //size++;
                    for (int j = 0; j < cols; j++) {
                     size++;
                        // 四个参数分别为图像起点坐标和宽高
                        // 即: CropImageFilter(int x,int y,int width,int height)
                        cropFilter = new CropImageFilter(j * destWidth, i * destHeight,
                                destWidth, destHeight);
                        img = Toolkit.getDefaultToolkit().createImage(
                                new FilteredImageSource(image.getSource(),
                                        cropFilter));
                        BufferedImage tag = new BufferedImage(destWidth,
                                destHeight, BufferedImage.TYPE_INT_RGB);
                        Graphics g = tag.getGraphics();
                        g.drawImage(img, 0, 0, null); // 绘制缩小后的图
                        g.dispose();



                        // 输出为文件
                        ImageIO.write(tag, "JPEG", new File(descDir
                                + j + "," + i + ".jpg"));
                        System.out.println("已完成"+size+"/"+num+"!");
                    }
                }
                System.out.println("切割完成!");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

调试易

Java操作图片问题，有经验者请~

解决方案 »