ffmepg入门学习九 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<ImageReader> 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<ImageReader> 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<ImageReader> 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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转载自：https://blog.csdn.net/qq_16855077/article/details/90378173

 1.准备