package com.snow.web.a_test;import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;import javax.imageio.ImageIO;import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;public class Test {private static String path = "F:\\";public static void main(String[] args) throws Exception {System.out.println("=======================================");
//        String path = "F:\\test.jpg";
//      File files = new File(path);
//      handleDpi(files, 300, 300); //        String path = "F:\\";  File file1 = new File(path, "1.jpg");  File file2 = new File(path, "2.png");
//        mosaicImage(file1, file2);
        mergeImage(file1, file2); }/** * 改变图片DPI * * @param file * @param xDensity * @param yDensity * @throws ImageReadException */  public static void handleDpi(File file, int xDensity, int yDensity){  try {  BufferedImage image = ImageIO.read(file);  JPEGImageEncoder jpegEncoder = JPEGCodec.createJPEGEncoder(new FileOutputStream(file));  JPEGEncodeParam jpegEncodeParam = jpegEncoder.getDefaultJPEGEncodeParam(image);  jpegEncodeParam.setDensityUnit(JPEGEncodeParam.DENSITY_UNIT_DOTS_INCH);  jpegEncoder.setJPEGEncodeParam(jpegEncodeParam);  jpegEncodeParam.setQuality(0.75f, false);  jpegEncodeParam.setXDensity(xDensity);  jpegEncodeParam.setYDensity(yDensity);  jpegEncoder.encode(image, jpegEncodeParam);  image.flush();  } catch (IOException e) {  e.printStackTrace();  }  } /*** 图片拼接* @param file1 左边* @param file2    右边* @throws IOException*/public static void mosaicImage(File file1, File file2) throws IOException {        BufferedImage image1 = ImageIO.read(file1);  BufferedImage image2 = ImageIO.read(file2);  BufferedImage combined = new BufferedImage(image1.getWidth() * 2, image1.getHeight(), BufferedImage.TYPE_INT_RGB);  // paint both images, preserving the alpha channels  Graphics g = combined.getGraphics();  g.drawImage(image1, 0, 0, null);  g.drawImage(image2, image1.getWidth(), 0, null);  // Save as new image  ImageIO.write(combined, "JPG", new File(path, "3.jpg"));  }  /*** 图片合并* @param file1 左边* @param file2    右边* @throws IOException*/public static void mergeImage(File file1, File file2) throws IOException {        BufferedImage image1 = ImageIO.read(file1);  BufferedImage image2 = ImageIO.read(file2);  BufferedImage combined = new BufferedImage(image1.getWidth(), image1.getHeight(), BufferedImage.TYPE_INT_RGB);  // paint both images, preserving the alpha channels  Graphics g = combined.getGraphics();  System.out.println(image2.getData());g.drawImage(image1, 0, 0, null);  g.drawImage(image2, 0, 0, image1.getWidth(), image1.getHeight(), null);  // Save as new image  ImageIO.write(combined, "JPG", new File(path, "4.jpg"));  }  }