Java实现图片切割功能

Java实现图片切割功能

本文实例为大家分享了java实现图片切割功能的具体代码，供大家参考，具体内容如下

工具类

package com.xudaolong.Utils;

import javax.imageio.IIOImage;

import javax.imageio.ImageIO;

import javax.imageio.ImageReader;

import javax.imageio.ImageWriter;

import javax.imageio.stream.ImageInputStream;

import javax.imageio.stream.ImageOutputStream;

import java.awt.*;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.util.Arrays;

import java.util.Iterator;

/**

* 图像裁剪以及压缩处理工具类

*

* 主要针对动态的GIF格式图片裁剪之后，只出现一帧动态效果的现象提供解决方案

*

* 提供依赖三方包解决方案（针对GIF格式数据特征一一解析，进行编码解码操作）

* 提供基于JDK Image I/O 的解决方案(JDK探索失败)

*/

public class ImageCutterUtil {

public enum IMAGE_FORMAT {

BMP("bmp"),

JPG("jpg"),

WBMP("wbmp"),

JPEG("jpeg"),

PNG("png"),

GIF("gif");

private String value;

IMAGE_FORMAT(String value) {

this.value = value;

}

public String getValue() {

return value;

}

public void setValue(String value) {

this.value = value;

}

}

/**

* 获取图片格式

*

* @param file 图片文件

* @return 图片格式

*/

public static String getImageFormatName(File file) throws IOException {

String formatName = null;

ImageInputStream iis = ImageIO.createImageInputStream(file);

Iterator imageReader = ImageIO.getImageReaders(iis);

if (imageReader.hasNext()) {

ImageReader reader = imageReader.next();

formatName = reader.getFormatName();

}

return formatName;

}

/*********************** 基于JDK 解决方案 ********************************/

/**

* 读取图片

*

* @param file 图片文件

* @return 图片数据

* @throws IOException

*/

public static BufferedImage[] readerImage(File file) throws IOException {

BufferedImage sourceImage = ImageIO.read(file);

BufferedImage[] images = null;

ImageInputStream iis = ImageIO.createImageInputStream(file);

Iterator imageReaders = ImageIO.getImageReaders(iis);

if (imageReaders.hasNext()) {

ImageReader reader = imageReaders.next();

reader.setInput(iis);

int imageNumber = reader.getNumImahttp://ges(true);

images = new BufferedImage[imageNumber];

for (int i = 0; i < imageNumber; i++) {

BufferedImage http://image = reader.read(i);

if (sourceImage.getWidth() > image.getWidth() || sourceImage.getHeight() > image.getHeight()) {

image = zoom(image, sourceImage.getWidth(), sourceImage.getHeight());

}

images[i] = image;

}

reader.dispose();

iis.close();

}

return images;

}

/**

* 根据要求处理图片

*

* @param images 图片数组

* @param x 横向起始位置

* @param y 纵向起始位置

* @param width 宽度

* @param height 宽度

* @return 处理后的图片数组

* @throws Exception

*/

public static BufferedImage[] processImage(BufferedImage[] images, int x, int y, int width, int height) throws Exception {

if (null == images) {

return images;

}

BufferedImage[] oldImages = images;

images = new BufferedImage[images.length];

for (int i = 0; i < oldImages.length; i++) {

BufferedImage image = oldImages[i];

images[i] = image.getSubimage(x, y, width, height);

}

return images;

}

/**

* 写入处理后的图片到file

*

* 图片后缀根据图片格式生成

*

* @param images 处理后的图片数据

* @param formatName 图片格式

* @param file 写入文件对象

* @throws Exception

*/

public static void writerImage(BufferedImage[] images, String formatName, File file) throws Exception {

Iterator imageWriters = ImageIO.getImageWritersByFormatName(formatName);

if (imageWriters.hasNext()) {

ImageWriter writer = imageWriters.next();

String fileName = file.getName();

int index = fileName.lastIndexOf(".");

if (index > 0) {

fileName = fileName.substring(0, index + 1) + formatName;

}

String pathPrefix = getFilePrefixPath(file.getPath());

File outFile = new File(pathPrefix + fileName);

ImageOutputStream ios = ImageIO.createImageOutputStream(outFile);

writer.setOutput(ios);

if (writer.canWriteSequence()) {

writer.prepareWriteSequence(null);

for (int i = 0; i < images.length; i++) {

BufferedImage childImahttp://ge = images[i];

IIOImage image = new IIOImage(childImage, null, null);

writer.writeToSequence(image, null);

}

writer.endWriteSequence();

} else {

for (int i = 0; i < images.length; i++) {

writer.write(images[i]);

}

}

writer.dispose();

ios.close();

}

}

/**

* 剪切格式图片

*

* 基于JDK Image I/O解决方案

*

* @param sourceFile 待剪切图片文件对象

* @param destFile 裁剪后保存文件对象

* @param x 剪切横向起始位置

* @param y 剪切纵向起始位置

* @param width 剪切宽度

* @param height 剪切宽度

* @throws Exception

*/

public static void cutImage(File sourceFile, File destFile, int x, int y, int width, int height) throws Exception {

// 读取图片信息

BufferedImage[] images = readerImage(sourceFile);

// 处理图片

images = processImage(images, x, y, width, height);

// 获取文件后缀

String formatName = getImageFormatName(sourceFile);

destFile = new File(getPathWithoutSuffix(destFile.getPath()) + formatName);

// 写入处理后的图片到文件

writerImage(images, formatName, destFile);

}

/**

* 获取系统支持的图片格式

*/

public static void getOSSupportsStandardImageFormat() {

String[] readerFormatName = ImageIO.getReaderFormatNames();

String[] readerSuffixName = ImageIO.getReaderFileSuffixes();

String[] readerMIMEType = ImageIO.getReaderMIMETypes();

System.out.println("========================= OS supports reader ========================");

System.ouNFTVUFIDHat.println("OS supports reader format name : " + Arrays.asList(readerFormatName));

System.out.println("OS supports reader suffix name : " + Arrays.asList(readerSuffixName));

System.out.println("OS supports reader MIME type : " + Arrays.asList(readerMIMEType));

String[] writerFormatName = ImageIO.getWriterFormatNames();

String[] writerSuffixName = ImageIO.getWriterFileSuffixes();

String[] writerMIMEType = ImageIO.getWriterMIMETypes();

System.out.println("========================= OS supports writer ========================");

System.out.println("OS supports writer format name : " + Arrays.asList(writerFormatName));

System.out.println("OS supports writer suffix name : " + Arrays.asList(writerSuffixName));

System.out.println("OS supports writer MIME type : " + Arrays.asList(writerMIMEType));

}

/**

* 压缩图片

*

* @param sourceImage 待压缩图片

* @param width 压缩图片高度

* @param height 压缩图片宽度

*/

private static BufferedImage zoom(BufferedImage sourceImage, int width, int height) {

BufferedImage zoomImage = new BufferedImage(width, height, sourceImage.getType());

Image image = sourceImage.getScaledInstance(width, height, Image.SCALE_SMOOTH);

Graphics gc = zoomImage.getGraphics();

gc.setColor(Color.WHITE);

gc.drawImage(image, 0, 0, null);

return zoomImage;

}

/**

* 获取某个文件的前缀路径

*

* 不包含文件名的路径

*

* @param file 当前文件对象

* @return

* @throws IOException

*/

public static String getFilePrefixPath(File file) throws IOException {

String path = null;

if (!file.exists()) {

throw new IOException("not found the file !");

}

String fileName = file.getName();

path = file.getPath().replace(fileName, "");

return path;

}

/**

* 获取某个文件的前缀路径

*

* 不包含文件名的路径

*

* @param path 当前文件路径

* @return 不包含文件名的路径

* @throws Exception

*/

public static String getFilePrefixPath(String path) throws Exception {

if (null == path || path.isEmpty()) throw new Exception("文件路径为空！");

int index = path.lastIndexOf(File.separator);

if (index > 0) {

path = path.substring(0, index + 1);

}

return path;

}

/**

* 获取不包含后缀的文件路径

*

* @param src

* @return

*/

public static String getPathWithoutSuffix(String src) {

String path = src;

int index = path.lastIndexOf(".");

if (index > 0) {

path = path.substring(0, index + 1);

}

return path;

}

/**

* 获取文件名

*

* @param filePath 文件路径

* @return 文件名

* @throws IOException

*/

public static String getFileName(String filePath) throws IOException {

File file = new File(filePath);

if (!file.exists()) {

throw new IOException("not found the file !");

}

return file.getName();

}

/**

* @param args

* @throws Exception

*/

public static void main(String[] args) throws Exception {

// 获取系统支持的图片格式

// ImageCutterUtil.getOSSupportsStandardImageFormat();

try {

// 起始坐标，剪切大小

int x = 14;

int y = 24;

int width = 62;

int height = 62;

// 参考图像大小

int clientWidth = 88;

int clientHeight = 88;

File file = new File("/Users/mac/IdeaProjects/QRdemo/resources/src/com/xudaolong/QR/TestQR/QR.jpg");

BufferedImage image = ImageIO.read(file);

double destWidth = image.getWidth();

double destHeight = image.getHeight();

if (destWidth < width || destHeight < height)

throw new Exception("源图大小小于截取图片大小!");

double widthRatio = destWidth / clientWidth;

double heightRatio = destHeight / clientHeight;

x = Double.valueOf(x * widthRatio).intValue();

y = Double.valueOf(y * heightRatio).intValue();

width = Double.valueOf(width * widthRatio).intValue();

height = Double.valueOf(height * heightRatio).intValue();

System.out.println("裁剪大小 x:" + x + ",y:" + y + ",width:" + width + ",height:" + height);

String formatName = getImageFormatName(file);

String pathSuffix = "." + formatName;

String pathPrefix = getFilePrefixPath(file);

String targetPath = pathPrefix + System.currentTimeMillis() + pathSuffix;

File destFile = new File(targetPath);

ImageCutterUtil.cutImage(file, destFile, x, y, width, height);

} catch (IOException e) {

e.printStackTrace();

}

}

}

单方面测试

public void cutQR(String sourcePath) {

try {

File file = new File(sourcePath);

BufferedImage image = ImageIO.read(file);

// 起始坐标，剪切大小

int x = 14;

int y = 25;

int width = 62;

int height = 62;

// 参考图像大小

int clientWidth = 88;

int clientHeight = 88;

double destWidth = image.getWidth();

double destHeight = image.getHeight();

if (destWidth < width || destHeight < height)

throw new Exception("源图大小小于截取图片大小!");

double widthRatio = destWidth / clientWidth;

double heightRatio = destHeight / clientHeight;

//修改一下单位

x = Double.valueOf(x * widthRatio).intValue();

y = Double.valueOf(y * heightRatio).intValue();

width = Double.valueOf(width * widthRatio).intValue();

height = Double.valueOf(height * heightRatio).intValue();

System.out.println("裁剪大小 x:" + x + ",y:" + y + ",width:" + width + ",height:" + height);

//获取指定的名字

// String formatName = getImageFormatName(file);

// String pathSuffix = "." + formatName;

// String pathPrefix = getFilePrefixPath(file);

// String targetPath = pathPrefix + System.currentTimeMillis() + pathSuffix;

//最后一步进行裁剪到指定的名字

File destFile = new File(sourcePath);

ImageCutterUtil.cutImage(file, destFile, x, y, width, height);

} catch (Exception e) {

e.printStackTrace();

}

}

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。