功能说明:1.指定图片大小缩放图片(reSize);2.指定图片的宽度,高度根据比例缩放(reSizeByWith);3.指定图片的高度,宽度根据比例缩放(reSizeByHeight);4.判断是否为图片文件(isImageFile);<strong>Java中图片常用处理工具类 </strong><br />
<br />
功能说明:<br />
1.指定图片大小缩放图片(reSize);<br />
2.指定图片的宽度,高度根据比例缩放(reSizeByWith);<br />
3.指定图片的高度,宽度根据比例缩放(reSizeByHeight);<br />
4.判断是否为图片文件(isImageFile);<br />
5.判断图片格式是否支持(isSupportFormat);<br />
6.给图片添加水印(markLogo);<br />
<br />
支持的图片格式: JPG,BMP,GIF,WBMP,PNG,JPEG
<pre>
<code class="language-java">package net.xqlee.project.demo.fastdfs.clients;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.Arrays;
import javax.imageio.ImageIO;
import org.springframework.util.StringUtils;
/**
* <pre>
* Java中图片常用处理工具类
* 功能说明:
* 1.指定图片大小缩放图片(reSize);
* 2.指定图片的宽度,高度根据比例缩放(reSizeByWith);
* 3.指定图片的高度,宽度根据比例缩放(reSizeByHeight);
* 4.判断是否为图片文件(isImageFile);
* 5.判断图片格式是否支持(isSupportFormat);
* 6.给图片添加水印(markLogo);
* 支持的图片格式:
* JPG,BMP,GIF,WBMP,PNG,JPEG
* </pre>
*
* @author xq
*
*/
public class ImageUtils {
/****
* 判断是否为图片文件,如果是图片文件则返回BufferedImage对象,反之则返回null
*
* @param imageFile
* 图片文件
* @return BufferedImage
* @throws IOException
* IO异常
*/
public static BufferedImage isImageFile(File imageFile) throws IOException {
BufferedImage image = isImageFile(new FileInputStream(imageFile));
return image;
}
/****
* 判断是否为图片文件,如果是图片文件则返回BufferedImage对象,反之则返回null
*
* @param imageFileInputStream
* 图片文件的输入流
* @return BufferedImage
* @throws IOException
* IO异常
*/
public static BufferedImage isImageFile(InputStream imageFileInputStream) throws IOException {
BufferedImage image = ImageIO.read(imageFileInputStream);
return image;
}
/**
* 图片格式是否支持
*
* @param formatName
* 图片格式名称
* @return 是否支持
*/
public static boolean isSupportFormat(String formatName) {
if (StringUtils.isEmpty(formatName)) {
return false;
}
String supportTypes = Arrays.toString(ImageIO.getReaderFormatNames());
if (supportTypes.indexOf(formatName) == -1) {
return false;
} else {
return true;
}
}
/**
* 重置图片到指定的宽和高
*
* @param imageFile
* @param imageFileOutputStream
* @param formatName
* @param newWith
* @param newHeight
* @throws IOException
*/
public static void reSize(InputStream imageFile, OutputStream imageFileOutputStream, String formatName, int newWith,
int newHeight) throws IOException {
// 1.判断文件格式是否支持
if (!isSupportFormat(formatName)) {
throw new IOException(
"Format Not Support:" + formatName + ",Support" + Arrays.toString(ImageIO.getReaderFormatNames()));
}
// 1.判断是否为图片文件
BufferedImage bufferedImage = isImageFile(imageFile);
if (bufferedImage == null) {
throw new IOException("Input File Is Not Image File.");
}
// 2.调整到指定宽高
BufferedImage newImage = new BufferedImage(newWith, newHeight, bufferedImage.getType());
// 3.执行重构画操作
Graphics2D graphics = newImage.createGraphics();
graphics.drawImage(bufferedImage, 0, 0, newWith, newHeight, Color.LIGHT_GRAY, null);
graphics.dispose();
// 4.输出缩略图片
ImageIO.write(newImage, formatName, imageFileOutputStream);
}
/**
* 指定图片的宽,高根据比例压缩
*
* @param imageFile
* 远图片
* @param imageFileOutputStream
* 新图片输出
* @param formatName
* 图片格式
* @param newWith
* 新的宽度
* @throws IOException
*/
public static void reSizeByWith(InputStream imageFile, OutputStream imageFileOutputStream, String formatName,
int newWith) throws IOException {
// 1.判断文件格式是否支持
if (!isSupportFormat(formatName)) {
throw new IOException(
"Format Not Support:" + formatName + ",Support" + Arrays.toString(ImageIO.getReaderFormatNames()));
}
// 1.判断是否为图片文件
BufferedImage bufferedImage = isImageFile(imageFile);
if (bufferedImage == null) {
throw new IOException("Input File Is Not Image File.");
}
// 2.调整到指定宽
int oldWith = bufferedImage.getWidth();
int oldHeigth = bufferedImage.getHeight();
// 计算比例
BigDecimal newWithBig = new BigDecimal(newWith);
float ratio = newWithBig.divide(new BigDecimal(oldWith), 2, RoundingMode.HALF_UP).floatValue();
int newHeight = (int) (oldHeigth * ratio);
if (newHeight == 0) {// 太小的时候默认原始高度
newHeight = oldHeigth;
}
BufferedImage newImage = new BufferedImage(newWith, newHeight, bufferedImage.getType());
// 3.执行重构画操作
Graphics2D graphics = newImage.createGraphics();
graphics.drawImage(bufferedImage, 0, 0, newWith, newHeight, null);
graphics.dispose();
// 4.输出缩略图片
ImageIO.write(newImage, formatName, imageFileOutputStream);
}
public static void reSizeByHeight(InputStream imageFile, OutputStream imageFileOutputStream, String formatName,
int newHeight) throws IOException {
// 1.判断文件格式是否支持
if (!isSupportFormat(formatName)) {
throw new IOException(
"Format Not Support:" + formatName + ",Support" + Arrays.toString(ImageIO.getReaderFormatNames()));
}
// 1.判断是否为图片文件
BufferedImage bufferedImage = isImageFile(imageFile);
if (bufferedImage == null) {
throw new IOException("Input File Is Not Image File.");
}
// 2.调整到指定宽
int oldWith = bufferedImage.getWidth();
int oldHeigth = bufferedImage.getHeight();
// 计算比例
BigDecimal newHeightBig = new BigDecimal(newHeight);
float ratio = newHeightBig.divide(new BigDecimal(oldHeigth), 2, RoundingMode.HALF_UP).floatValue();
int newWith = (int) (oldWith * ratio);
if (newWith == 0) {// 太小的时候默认原始高度
newWith = oldWith;
}
BufferedImage newImage = new BufferedImage(newWith, newHeight, bufferedImage.getType());
// 3.执行重构画操作
Graphics2D graphics = newImage.createGraphics();
graphics.drawImage(bufferedImage, 0, 0, newWith, newHeight, null);
graphics.dispose();
// 4.输出缩略图片
ImageIO.write(newImage, formatName, imageFileOutputStream);
}
/**
* 添加水印LOGO
*
* @param targetImage
* 需要添加水印的原图
* @param logoImage
* 水印图片/水印Logo
* @param x
* Logo存放的x轴（原图的左上角为0，0）
* @param y
* Logo存放的y轴（原图的左上角为0，0）
* @throws IOException
* IO异常
*/
public static void markLogo(BufferedImage targetImage, BufferedImage logoImage, int x, int y) {
Graphics2D g = targetImage.createGraphics();
g.drawImage(targetImage, 0, 0, targetImage.getWidth(), targetImage.getHeight(), null);
g.drawImage(logoImage, x, y, logoImage.getWidth(), logoImage.getHeight(), null);
g.dispose();
}
/**
* 添加水印LOGO,执行后新的图片将存放于targetImage里面
*
* @param targetImage
* 需要添加水印的图片文件流
* @param targetImageFormat
* 图片格式
* @param logoImage
* 水印图片流/logo图片流
* @param x
* Logo存放的x轴（原图的左上角为0，0）
* @param y
* Logo存放的y轴（原图的左上角为0，0）
* @param imageFileOutputStream
* 最终图片文件输出流
* @throws IOException
* IO异常需要捕获
*/
public static void markLogo(InputStream targetImage, String targetImageFormat, InputStream logoImage, int x, int y,
OutputStream imageFileOutputStream) throws IOException {
if (!isSupportFormat(targetImageFormat)) {
throw new IOException("Image Format Not Support." + targetImageFormat + ",Support"
+ Arrays.toString(ImageIO.getReaderFormatNames()));
}
BufferedImage targetImageBuffere = ImageIO.read(targetImage);
BufferedImage logoImageBuffere = ImageIO.read(logoImage);
markLogo(targetImageBuffere, logoImageBuffere, x, y);
ImageIO.write(targetImageBuffere, targetImageFormat, imageFileOutputStream);
}
/**
* 添加水印LOGO
*
* @param targetImage
* 需要添加logo的图片
* @param logoImage
* logo图片
* @param x
* Logo存放的x轴（原图的左上角为0，0）
* @param y
* Logo存放的y轴（原图的左上角为0，0）
* @param imageFileOutputStream
* 最终图片文件输出流
* @throws IOException
* IO异常需要捕获
*/
public static void markLogo(File targetImage, File logoImage, int x, int y, OutputStream imageFileOutputStream)
throws IOException {
String filename = targetImage.getName();
String format = filename.substring(filename.indexOf(".") + 1).toUpperCase();
markLogo(new FileInputStream(targetImage), format, new FileInputStream(logoImage), x, y, imageFileOutputStream);
}
public static void main(String[] args) {
try {
//@formatter:off
// 重置大小测试
//指定宽高
// reSize(
// new FileInputStream(new File("C:\\Users\\xq\\Pictures\\1.jpg")),
// new FileOutputStream(new File("C:\\Users\\xq\\Pictures\\1-t.jpg")), "jpg", 400, 400);
//指定宽
// reSizeByWith(
// new FileInputStream(new File("C:\\Users\\xq\\Pictures\\1.jpg")),
// new FileOutputStream(new File("C:\\Users\\xq\\Pictures\\1-t.jpg")),
// "jpg", 400);
//指定高度
// reSizeByHeight(
// new FileInputStream(new File("C:\\Users\\xq\\Pictures\\0.png")),
// new FileOutputStream(new File("C:\\Users\\xq\\Pictures\\1-t-h.png")),
// "png", 400);
// logo水印测试
// markLogo(
// new FileInputStream(new File("C:\\Users\\xq\\Pictures\\0.jpg")), "JPG",
// new FileInputStream( new File("C:\\Users\\xq\\Pictures\\tx.jpg")), 0,0,
// new FileOutputStream(new File("C:\\Users\\xq\\Pictures\\1-tx.jpg")));
markLogo(
new File("C:\\Users\\xq\\Pictures\\0.png"),
new File("C:\\Users\\xq\\Pictures\\tx.jpg"), 0, 0,
new FileOutputStream(new File("C:\\Users\\xq\\Pictures\\1-tx.png")));
System.out.println(Arrays.toString(ImageIO.getReaderFormatNames()));
//@formatter:off
} catch (Exception e) {
e.printStackTrace();
}
}
}
</code></pre>