java实现图片截图

 1.准备

需求，形成1天每个小时的画像，并合成一个图片。

思路：每个小时抽取一张图片,再把这种图片截取1/24并存放，后面，再把这24张图片合成一张图片。

准备一张原图

截图前：

 截图后:(下午14点的截图)

 

 

package com.qihui.qxj.utils;  
  
import java.awt.Rectangle;  
import java.awt.image.BufferedImage;  
import java.io.*;  
import java.util.Iterator;  
import javax.imageio.ImageIO;  
import javax.imageio.ImageReadParam;  
import javax.imageio.ImageReader;  
import javax.imageio.stream.ImageInputStream;  
  
public class ImageUtils {  
    public static void cutJPG(InputStream input, OutputStream out, int x,  
            int y, int width, int height) throws IOException {  
        ImageInputStream imageStream = null;  
        try {  
            Iterator readers = ImageIO.getImageReadersByFormatName("jpg");  
            ImageReader reader = readers.next();  
            imageStream = ImageIO.createImageInputStream(input);  
            reader.setInput(imageStream, true);  
            ImageReadParam param = reader.getDefaultReadParam();  
              
            System.out.println(reader.getWidth(0));  
            System.out.println(reader.getHeight(0));  
            Rectangle rect = new Rectangle(x, y, width, height);  
            param.setSourceRegion(rect);  
            BufferedImage bi = reader.read(0, param);  
            ImageIO.write(bi, "jpg", out);  
        } finally {  
            imageStream.close();  
        }  
    }  
      
      
    public static void cutPNG(InputStream input, OutputStream out, int x,  
            int y, int width, int height) throws IOException {  
        ImageInputStream imageStream = null;  
        try {  
            Iterator readers = ImageIO.getImageReadersByFormatName("png");  
            ImageReader reader = readers.next();  
            imageStream = ImageIO.createImageInputStream(input);  
            reader.setInput(imageStream, true);  
            ImageReadParam param = reader.getDefaultReadParam();  
              
            System.out.println(reader.getWidth(0));  
            System.out.println(reader.getHeight(0));  
              
            Rectangle rect = new Rectangle(x, y, width, height);  
            param.setSourceRegion(rect);  
            BufferedImage bi = reader.read(0, param);  
            ImageIO.write(bi, "png", out);  
        } finally {  
            imageStream.close();  
        }  
    }  
      
    public static void cutImage(InputStream input, OutputStream out, String type,int x,  
            int y, int width, int height) throws IOException {  
        ImageInputStream imageStream = null;  
        try {  
            String imageType=(null==type||"".equals(type))?"jpg":type;  
            Iterator readers = ImageIO.getImageReadersByFormatName(imageType);  
            ImageReader reader = readers.next();  
            imageStream = ImageIO.createImageInputStream(input);  
            reader.setInput(imageStream, true);  
            ImageReadParam param = reader.getDefaultReadParam();  
            Rectangle rect = new Rectangle(x, y, width, height);  
            param.setSourceRegion(rect);  
            BufferedImage bi = reader.read(0, param);  
            ImageIO.write(bi, imageType, out);  
        } finally {  
            imageStream.close();  
        }  
    }  
  
      
    public static void main(String[] args) throws Exception {  
    	String imgName = "D:\\test.jpg";
    	BufferedImage sourceImg = ImageIO.read(new FileInputStream(imgName));
    	//获取原始图片的宽高
	    int height = sourceImg.getHeight();
	    int width = sourceImg.getWidth();
		sourceImg.flush();
		int x = (width / 24) * (14);
		int y = 0;
        ImageUtils.cutJPG(new FileInputStream(imgName),  
                  new FileOutputStream("D:\\test123.jpg"), x,y,width,height);  
          
  /*      ImageUtils.cutPNG(new FileInputStream("c:\\1.png"),  
                new FileOutputStream("c:\\test3.png"), 0,0,50,40);  */
    }  
}  

本文章暂时只实现图片的截取，把一张图片切割成24份，取对应小时对应在原图的宽高。如何把24张图片合成一张图片。且看下下文。

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