src/main/java/com/zx/maintain/util/ImageHelper.java

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package com.zx.maintain.util;

import java.awt.Image;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

public class ImageHelper {
	/*
	 * 根据尺寸图片居中裁剪
	 */
	@SuppressWarnings("unchecked")
	public static void cutCenterImage(String src, String dest, int w, int h) throws IOException {
		Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");
		ImageReader reader = (ImageReader) iterator.next();
		InputStream in = new FileInputStream(src);
		ImageInputStream iis = ImageIO.createImageInputStream(in);
		reader.setInput(iis, true);
		ImageReadParam param = reader.getDefaultReadParam();
		int imageIndex = 0;
		Rectangle rect = new Rectangle((reader.getWidth(imageIndex) - w) / 2, (reader.getHeight(imageIndex) - h) / 2, w, h);
		param.setSourceRegion(rect);
		BufferedImage bi = reader.read(0, param);
		ImageIO.write(bi, "jpg", new File(dest));

	}

	/*
	 * 图片裁剪二分之一
	 */
	@SuppressWarnings("unchecked")
	public static void cutHalfImage(String src, String dest) throws IOException {
		Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");
		ImageReader reader = (ImageReader) iterator.next();
		InputStream in = new FileInputStream(src);
		ImageInputStream iis = ImageIO.createImageInputStream(in);
		reader.setInput(iis, true);
		ImageReadParam param = reader.getDefaultReadParam();
		int imageIndex = 0;
		int width = reader.getWidth(imageIndex) / 2;
		int height = reader.getHeight(imageIndex) / 2;
		Rectangle rect = new Rectangle(width / 2, height / 2, width, height);
		param.setSourceRegion(rect);
		BufferedImage bi = reader.read(0, param);
		ImageIO.write(bi, "jpg", new File(dest));
	}

	/*
	 * 图片裁剪通用接口