一.图片收缩和添加水印工具类 ImageProcessUtils：
package com.ftk.eloan.framework.utils;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.imageio.ImageIO;
/**
* 图片工具类， 图片水印，文字水印，缩放，补白等
* @author Carl He
*/
public final class ImageProcessUtils {
/**图片格式：JPG*/
private static final String PICTRUE_FORMATE_JPG = "jpg";
/**
* 缩小并转换格式
*
* @param srcPath源路径
* @param destPath目标路径
* @param height目标高
* @param width
* 目标宽
* @param formate
* 文件格式
* @return
*
boolean flag = ImageProcessUtils.narrowAndFormateTransfer("E:\\我的图片/雨伞.jpg",
"E:\\我的图片/雨伞.png", 400, 400, "png");
*/
public static boolean narrowAndFormateTransfer(String srcPath, String destPath, int height, int width, String formate) {
boolean flag = false;
BufferedImage src =null;
try {
File file = new File(srcPath);
File destFile = new File(destPath);
if (!destFile.getParentFile().exists()) {
destFile.getParentFile().mkdir();
}
src = ImageIO.read(file); // 读入文件
Image image = src.getScaledInstance(width, height, Image.SCALE_DEFAULT);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(image, 0, 0, null); // 绘制缩小后的图
g.dispose();
flag = ImageIO.write(tag, formate, new FileOutputStream(destFile));// 输出到文件流
} catch (IOException e) {
e.printStackTrace();
}finally {
src.flush();
}
return flag;
}
/**
* 添加图片水印
* @param targetImg 目标图片路径，如：C://myPictrue//1.jpg
* @param waterImg 水印图片路径，如：C://myPictrue//logo.png
* @param x 水印图片距离目标图片左侧的偏移量，如果x<0, 则在正中间
* @param y 水印图片距离目标图片上侧的偏移量，如果y<0, 则在正中间
* @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明)
*/
public final static void pressImage(String targetImg, String waterImg, int x, int y, float alpha) {
try {
File file = new File(targetImg);
Image image = ImageIO.read(file);
int width = image.getWidth(null);
int height = image.getHeight(null);
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufferedImage.createGraphics();
g.drawImage(image, 0, 0, width, height, null);
Image waterImage = ImageIO.read(new File(waterImg)); // 水印文件
int width_1 = waterImage.getWidth(null);
int height_1 = waterImage.getHeight(null);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
int widthDiff = width - width_1;
int heightDiff = height - height_1;
if(x < 0){
x = widthDiff / 2;
}else if(x > widthDiff){
x = widthDiff;
}
if(y < 0){
y = heightDiff / 2;
}else if(y > heightDiff){
y = heightDiff;
}
g.drawImage(waterImage, x, y, width_1, height_1, null); // 水印文件结束
g.dispose();
ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 添加文字水印
* @param targetImg 目标图片路径，如：C://myPictrue//1.jpg
* @param pressText 水印文字， 如：中国证券网
* @param fontName 字体名称， 如：宋体
* @param fontStyle 字体样式，如：粗体和斜体(Font.BOLD|Font.ITALIC)
* @param fontSize 字体大小，单位为像素
* @param color 字体颜色
* @param x 水印文字距离目标图片左侧的偏移量，如果x<0, 则在正中间
* @param y 水印文字距离目标图片上侧的偏移量，如果y<0, 则在正中间
* @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明)
*/
public static void pressText(String targetImg, String pressText, String fontName, int fontStyle, int fontSize, Color color, int x, int y, float alpha) {
BufferedImage bufferedImage=null;
try {
File file = new File(targetImg);
Image image = ImageIO.read(file);
int width = 400; //image.getWidth(null); //update by zsy 压缩图片大小
int height = 310;//image.getHeight(null);
bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufferedImage.createGraphics();
g.drawImage(image, 0, 0, width, height, null);
g.setFont(new Font(fontName, fontStyle, fontSize));
g.setColor(color);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
int width_1 = fontSize * getLength(pressText);
int height_1 = fontSize;
int widthDiff = width - width_1;
int heightDiff = height - height_1;
if(x < 0){
x = widthDiff / 2;
}else if(x > widthDiff){
x = widthDiff;
}
if(y < 0){
y = heightDiff / 2;
}else if(y > heightDiff){
y = heightDiff;
}
g.drawString(pressText, x, y + height_1);
g.dispose();
ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file);
} catch (Exception e) {
e.printStackTrace();
}finally {
bufferedImage.flush();
}
}
/**
* 获取字符长度，一个汉字作为 1 个字符, 一个英文字母作为 0.5 个字符
* @param text
* @return 字符长度，如：text="中国",返回 2；text="test",返回 2；text="中国ABC",返回 4.
*/
public static int getLength(String text) {
int textLength = text.length();
int length = textLength;
for (int i = 0; i < textLength; i++) {
if (String.valueOf(text.charAt(i)).getBytes().length > 1) {
length++;
}
}
return (length % 2 == 0) ? length / 2 : length / 2 + 1;
}
/**
* 图片缩放
* @param filePath 图片路径
* @param height 高度
* @param width 宽度
* @param bb 比例不对时是否需要补白
*/
public static void resize(String filePath, int height, int width, boolean bb) {
try {
double ratio = 0; //缩放比例
File f = new File(filePath);
BufferedImage bi = ImageIO.read(f);
Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH);
//计算比例
if ((bi.getHeight() > height) || (bi.getWidth() > width)) {
if (bi.getHeight() > bi.getWidth()) {
ratio = (new Integer(height)).doubleValue() / bi.getHeight();
} else {
ratio = (new Integer(width)).doubleValue() / bi.getWidth();
}
AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);
itemp = op.filter(bi, null);
}
if (bb) {
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, width, height);
if (width == itemp.getWidth(null))
g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), Color.white, null);
else
g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), Color.white, null);
g.dispose();
itemp = image;
}
ImageIO.write((BufferedImage) itemp, "jpg", f);
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws IOException {
narrowAndFormateTransfer("D://empupload/emp/IMAGE/2017/8/7/201708071033346266.png","D://empupload/emp/IMAGE/2017/8/7/20170807103334621236.png",400,100,"png");
// pressImage("d://pic//4.jpg", "d://pic//test.jpg", -1, -1, 0.5f);
// pressText("d://pic//2.jpg", "旺仔之印", "宋体", Font.BOLD|Font.ITALIC, 20, Color.BLACK, 0, 0, 0.4f);
// pressText("d://pic//2.jpg", "旺仔之印", "宋体", Font.BOLD, 20, Color.RED, 0, 0, 0.7f);
//resize("d://pic//4.jpg", 1000, 500, true);
}
}二.绘制验证码图片工具类 ImageUtils：
package com.ftk.eloan.framework.utils;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
import org.springframework.util.Base64Utils;
public class ImageUtils {
// 随机产生的字符串
private static final String RANDOM_STRS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static final String IMG_HEADER = "data:image/jpg;base64,";
private static final String FONT_NAME = "Fixedsys";
private static final int FONT_SIZE = 20;
private Random random = new Random();
private int width = 80;// 图片宽
private int height = 25;// 图片高
private int lineNum = 20;// 干扰线数量
private int strNum = 4;// 随机产生字符数量
/**
* 生成随机图片
*/
public BufferedImage genRandomCodeImage(StringBuffer randomCode) {
// BufferedImage类是具有缓冲区的Image类
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_BGR);
// 获取Graphics对象,便于对图像进行各种绘制操作
Graphics g = image.getGraphics();
// 设置背景色
// g.setColor(getRandColor(200, 250));
g.setColor(new Color(240, 248, 255));
g.fillRect(0, 0, width, height);
// 设置干扰线的颜色
g.setColor(getRandColor(110, 120));
// 绘制干扰线
for (int i = 0; i <= lineNum; i++) {
drowLine(g);
}
// 绘制随机字符
g.setFont(new Font(FONT_NAME, Font.ROMAN_BASELINE, FONT_SIZE));
for (int i = 1; i <= strNum; i++) {
randomCode.append(drowString(g, i));
}
g.dispose();
return image;
}
/**
* 给定范围获得随机颜色
*/
private Color getRandColor(int fc, int bc) {
if (fc > 255)
fc = 255;
if (bc > 255)
bc = 255;
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
/**
* 绘制字符串
*/
private String drowString(Graphics g, int i) {
g.setColor(Color.BLACK);
String rand = String.valueOf(getRandomString(random.nextInt(RANDOM_STRS
.length())));
g.translate(random.nextInt(3), random.nextInt(3));
g.drawString(rand, 13 * i, 16);
return rand;
}
/**
* 绘制干扰线
*/
private void drowLine(Graphics g) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int x0 = random.nextInt(16);
int y0 = random.nextInt(16);
g.drawLine(x, y, x + x0, y + y0);
}
/**
* 获取随机的字符
*/
private String getRandomString(int num) {
return String.valueOf(RANDOM_STRS.charAt(num));
}
public static String encodeImgToString(byte[] imgByte){
return IMG_HEADER + Base64Utils.encodeToString(imgByte);
}
public static void main(String[] args) {
ImageUtils tool = new ImageUtils();
StringBuffer code = new StringBuffer();
BufferedImage image = tool.genRandomCodeImage(code);
System.out.println(">>> random code =: " + code);
try {
// 将内存中的图片通过流动形式输出到客户端
ImageIO.write(image, "JPEG", new FileOutputStream(new File(
"/Users/wangchaochao/Desktop/random-code.jpg")));
} catch (Exception e) {
e.printStackTrace();
}
}
}