JQ插件之imgAreaSelect實現對圖片的在線截圖功能（java版）

時間 2019-11-13

標籤插件 imgareaselect 實現圖片在線截圖功能 java 欄目 JavaScript 简体版

原文原文鏈接

前言：在作網站的時候常常用的功能就是，用戶上傳圖片對本身上傳的圖片進行截圖，DIV本身的頭像。或者上傳幻燈片大圖進行DIV設置小圖。javascript

解決方案：目前我知道的解決方案有兩個以下：css

1、flash用戶上傳頭像組件，地址： http://www.hdfu.net/index.html （但收費）html

2、jq插件imgAreaSelect，地址：http://odyniec.net/projects/imgareaselect/java

注：官網文檔爲英文的，若是想看中文的這裏也有，http://www.jb51.net/article/28485.htm（不必定定保證是最新的）jquery

說了這麼多先看看效果吧ajax

直接上代碼:apache

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>imgAreaSelect圖片截圖</title>
    <script type="text/javascript" src="imgareaselect/scripts/jquery.min.js"></script>
    <script type="text/javascript" src="swfupload/swfupload.js"></script>
    <script type="text/javascript" src="imgareaselect/scripts/jquery.imgareaselect.pack.js"></script>
    <link href="css/style.css" rel="stylesheet" type="text/css"/>
    <link href="css/default.css" rel="stylesheet" type="text/css"/>
    <link href="imgareaselect/css/imgareaselect-default.css" rel="stylesheet" type="text/css"/>
    <script type="text/javascript"> $(function () { //回調方法
            function preview(img, selection) { if (!selection.width || !selection.height) return; var scaleX = 100 / selection.width; var scaleY = 100 / selection.height; $('#preview img').css({ width: Math.round(scaleX * 300), height: Math.round(scaleY * 300), marginLeft: -Math.round(scaleX * selection.x1), marginTop: -Math.round(scaleY * selection.y1) }); //完成後對錶單進行賦值
 $('input[name="x1"]').val(selection.x1); $('input[name="y1"]').val(selection.y1); $('input[name="x2"]').val(selection.x2); $('input[name="y2"]').val(selection.y2); $('input[name="path"]').val($('img#photo').attr("src")); $('#x1').val(selection.x1); $('#y1').val(selection.y1); $('#x2').val(selection.x2); $('#y2').val(selection.y2); $('#w').val(selection.width); $('#h').val(selection.height); $('#btn').show(); } $('#photo').imgAreaSelect({ aspectRatio: '1:1', //設置區域的比例
 handles: true, //設置區域的四角顯示
 fadeSpeed: 200, //動畫效果時間
 onSelectChange: preview //選擇完成後調用的方法
 }); //表單提交事件
 $('#btn').click(function () { if ($('#x1').val() == '') { alert('尚未進行截圖'); return; } $.ajax({ type: 'POST', url: '/uploadarea?operate=2', data: $('#dataForm').serialize(), dataType: 'json', cache: false, success: function (data) { if (data.success) { var imgLi = $("<li></li>"); var newImg = $('<div" class=\"img_box ' + '">' +
                                    '<img src="' + data.imgs + '" />').appendTo(imgLi); $("#show_list ul").append(imgLi); } } }); }); }); </script>
</head>
<body>
<h2 style="text-align: center">截圖演示</h2>

<div class="container demo">
    <div style="float: left; width: 50%;">
        <p class="instructions"> 點擊這裏，選擇截圖區域，<font color="red">必須爲等比例圖片</font>
        </p>

        <div class="frame" style="margin: 0 0.3em; width: 300px; height: 300px;">
            <img id="photo" src="img/605.jpg">
        </div>
    </div>

    <div style="float: left; width: 50%;">
        <p style="font-size: 110%; font-weight: bold; padding-left: 0.1em;"> 選擇區域預覽 </p>

        <div class="frame" style="margin: 0 1em; width: 100px; height: 100px;">
            <div id="preview" style="width: 100px; height: 100px; overflow: hidden;">
                <img src="img/605.jpg" style="width: 100px; height: 100px;">
            </div>
        </div>
        <%--表單數據--%>
        <form id="dataForm" style="position: absolute;top:25%;left:60%;">
            <input type="hidden" name="x1" value=""/>
            　　<input type="hidden" name="y1" value=""/>
            　　<input type="hidden" name="x2" value=""/>
            　　<input type="hidden" name="y2" value=""/>
            <input type="hidden" name="path"/>
            <input type="button" id="btn" style="display: none;" value="進行截圖"/>
        </form>

        <table style="margin-top: 1em;">
            <thead>
            <tr>
                <th colspan="2" style="font-size: 110%; font-weight: bold; text-align: left; padding-left: 0.1em;"> 座標 </th>
                <th colspan="2" style="font-size: 110%; font-weight: bold; text-align: left; padding-left: 0.1em;"> 尺寸 </th>
            </tr>
            </thead>
            <tbody>
            <tr>
                <td style="width: 10%;"><b>X<sub>1</sub>:</b></td>
                <td style="width: 30%;"><input type="text" id="x1" value="-"></td>
                <td style="width: 20%;"><b>Width:</b></td>
                <td><input type="text" value="-" id="w"></td>
            </tr>
            <tr>
                <td><b>Y<sub>1</sub>:</b></td>
                <td><input type="text" id="y1" value="-"></td>
                <td><b>Height:</b></td>
                <td><input type="text" id="h" value="-"></td>
            </tr>
            <tr>
                <td><b>X<sub>2</sub>:</b></td>
                <td><input type="text" id="x2" value="-"></td>
                <td></td>
                <td></td>
            </tr>
            <tr>
                <td><b>Y<sub>2</sub>:</b></td>
                <td><input type="text" id="y2" value="-"></td>
                <td></td>
                <td></td>
            </tr>
            </tbody>
        </table>
    </div>
</div>
<div style="margin: 0 auto;width:960px;">
    <h3>所得截圖</h3>

    <div id="show_list">
        <ul>

        </ul>
    </div>
</div>
</body>
</html>

上傳的Servlet代碼：json

package com.zxd.tool; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import javax.jws.WebService; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.util.List; import java.util.UUID; /** * 圖片上傳後進行，處理的裁剪類 * * @author 張曉東 */ @WebServlet("/uploadarea") public class UploadArea extends HttpServlet { private File tempDir;   //臨時路徑
    private File saveDir;   //保存路徑
    private File cutDir;    //裁剪圖片保存的路徑

    /** * servlet初始化事件 * * @param config * @throws ServletException */
    public void init(ServletConfig config) throws ServletException { String uploadPath = config.getServletContext().getRealPath("/"); StringBuffer sb = new StringBuffer(uploadPath); saveDir = new File(sb.append("\\upload").toString()); tempDir = new File(sb.append("\\temp").toString()); cutDir = new File(uploadPath + "\\upload\\cut"); if (!saveDir.exists()) { saveDir.mkdir(); } if (!tempDir.exists()) { tempDir.mkdir(); } if (!cutDir.exists()) { cutDir.mkdir(); } } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { int operate = request.getParameter("operate").isEmpty() ? 0 : Integer.valueOf(request.getParameter("operate")); //方法操做
        switch (operate) { case 1:             //上傳操做
 uploadImg(request, response); break; case 2:             //截圖操做
 cutImg(request, response); break; } } //上傳圖片
    private void uploadImg(HttpServletRequest request, HttpServletResponse response) throws IOException { DiskFileItemFactory factory = new DiskFileItemFactory(); factory.setSizeThreshold(1 * 1024 * 1024);      //設置緩衝區大小
        factory.setRepository(tempDir);             //設置臨時保存目錄
        ServletFileUpload sfu = new ServletFileUpload(factory); //Servelt文件上傳對象
        sfu.setFileSizeMax(200 * 1024 * 1024);  //200M 文件上傳大小
        sfu.setHeaderEncoding("utf-8"); List<FileItem> list = null; try { list = sfu.parseRequest(request);       //獲得文件
        } catch (FileUploadException e) { e.printStackTrace(); } int size = list.size(); StringBuffer json = new StringBuffer("{\"success\":true,\"imgs\":[");      //輸出到頁面的json
        PrintWriter out = response.getWriter(); for (int i = 0; i < size; i++) { //循環保存文件
            FileItem file = list.get(i); if (file.isFormField()) {   //若是是表單字段
                String name = file.getFieldName();  // 得到該字段名稱
                String value = file.getString("utf-8"); //得到該字段值
            } else { String extName = file.getName().substring(      //獲得擴展名
                        file.getName().lastIndexOf(".")); String fname = UUID.randomUUID() + extName; try { file.write(new File(saveDir, fname));  // 寫入文件
                    String path = request.getSession().getServletContext().getRealPath("/"); if (i == size) { json.append(saveDir.toString() + "\\" + fname + "]}");    //回傳上傳圖片路徑
 } } catch (Exception e) { e.printStackTrace(); } } } out.flush(); out.print(json); out.close(); } //裁剪圖片
    private void cutImg(HttpServletRequest request, HttpServletResponse response) throws IOException { StringBuffer json = new StringBuffer("{\"success\":true,\"imgs\":");      //輸出到頁面的json
        response.setContentType("text/plain;charset=utf-8"); response.setCharacterEncoding("utf-8"); //獲得座標
        Integer x1 = Integer.parseInt(request.getParameter("x1")); Integer y1 = Integer.parseInt(request.getParameter("y1")); Integer x2 = Integer.parseInt(request.getParameter("x2")); Integer y2 = Integer.parseInt(request.getParameter("y2")); String basePath = request.getSession().getServletContext().getRealPath("/");    //項目物理路徑
        String path = request.getParameter("path");             //原圖片路徑
        String extName = path.substring(path.lastIndexOf(".")); //文件擴展名
        int width = x2 - x1; //圖像的寬度
        int height = y2 - y1;//圖像的高度
        String cutFileName ="\\cut_" + UUID.randomUUID() + extName; ImageUtils.cut(basePath + "\\" + path,  cutDir.toString() + cutFileName, x1, y1, width, height); json.append("\"upload\\\\cut\\"+cutFileName+"\"}"); PrintWriter out = response.getWriter(); out.flush(); out.print(json); out.close(); } }

ImagesUtils.java網絡

package com.zxd.tool; /** * Created by zhang on 14-3-1. * 圖片的經常使用操做類 */

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.Toolkit; import java.awt.color.ColorSpace; import java.awt.geom.AffineTransform; import java.awt.image.AffineTransformOp; import java.awt.image.BufferedImage; import java.awt.image.ColorConvertOp; import java.awt.image.CropImageFilter; import java.awt.image.FilteredImageSource; import java.awt.image.ImageFilter; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; /** * 圖片處理工具類：<br> * 功能：縮放圖像、切割圖像、圖像類型轉換、彩色轉黑白、文字水印、圖片水印等 * * @author Administrator */
public class ImageUtils { /** * 幾種常見的圖片格式 */
    public static String IMAGE_TYPE_GIF = "gif";// 圖形交換格式
    public static String IMAGE_TYPE_JPG = "jpg";// 聯合照片專家組
    public static String IMAGE_TYPE_JPEG = "jpeg";// 聯合照片專家組
    public static String IMAGE_TYPE_BMP = "bmp";// 英文Bitmap（位圖）的簡寫，它是Windows操做系統中的標準圖像文件格式
    public static String IMAGE_TYPE_PNG = "png";// 可移植網絡圖形
    public static String IMAGE_TYPE_PSD = "psd";// Photoshop的專用格式Photoshop


    /** * 縮放圖像（按比例縮放） * * @param srcImageFile 源圖像文件地址(絕對路徑) * @param result 縮放後的圖像地址(絕對路徑) * @param scale 縮放比例 * @param flag 縮放選擇:true 放大; false 縮小; */
    public final static void scale(String srcImageFile, String result, int scale, boolean flag) { try { BufferedImage src = ImageIO.read(new File(srcImageFile)); // 讀入文件
            int width = src.getWidth(); // 獲得源圖寬
            int height = src.getHeight(); // 獲得源圖長
            if (flag) {// 放大
                width = width * scale; height = height * scale; } else {// 縮小
                width = width / scale; height = height / scale; } 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); // 繪製縮小後的圖
 g.dispose(); ImageIO.write(tag, "JPEG", new File(result));// 輸出到文件流
        } catch (IOException e) { e.printStackTrace(); } } /** * 縮放圖像（按高度和寬度縮放） * * @param srcImageFile 源圖像文件地址(絕對路徑) * @param result 縮放後的圖像地址(絕對路徑) * @param height 縮放後的高度 * @param width 縮放後的寬度 * @param bb 比例不對時是否須要補白：true爲補白; false爲不補白; */
    public final static void scale2(String srcImageFile, String result, int height, int width, boolean bb) { try { double ratio = 0.0; // 縮放比例
            File f = new File(srcImageFile); BufferedImage bi = ImageIO.read(f); Image itemp = bi.getScaledInstance(width, height, bi.SCALE_SMOOTH); // 計算比例
            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) {//補白
                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, "JPEG", new File(result)); } catch (IOException e) { e.printStackTrace(); } } /** * 圖像切割(按指定起點座標和寬高切割) * * @param srcImageFile 源圖像地址 (絕對路徑) * @param result 切片後的圖像地址 (絕對路徑) * @param x 目標切片起點座標X * @param y 目標切片起點座標Y * @param width 目標切片寬度 * @param height 目標切片高度 */
    public final static void cut(String srcImageFile, String result, int x, int y, int width, int height) { try { // 讀取源圖像
            BufferedImage bi = ImageIO.read(new File(srcImageFile)); int srcWidth = bi.getHeight(); // 源圖寬度
            int srcHeight = bi.getWidth(); // 源圖高度
            if (srcWidth > 0 && srcHeight > 0) { Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT); // 四個參數分別爲圖像起點座標和寬高 // 即: CropImageFilter(int x,int y,int width,int height)
                ImageFilter cropFilter = new CropImageFilter(x, y, width, height); Image img = Toolkit.getDefaultToolkit().createImage( new FilteredImageSource(image.getSource(), cropFilter)); BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(img, 0, 0, width, height, null); // 繪製切割後的圖
 g.dispose(); // 輸出爲文件
                ImageIO.write(tag, "JPEG", new File(result)); } } catch (Exception e) { e.printStackTrace(); } } /** * 圖像切割（指定切片的行數和列數） * * @param srcImageFile 源圖像地址 (絕對路徑) * @param descDir 切片目標文件夾 * @param rows 目標切片行數。默認2，必須是範圍 [1, 20] 以內 * @param cols 目標切片列數。默認2，必須是範圍 [1, 20] 以內 */
    public final static void cut2(String srcImageFile, String descDir, int rows, int cols) { try { if (rows <= 0 || rows > 20) rows = 2; // 切片行數
            if (cols <= 0 || cols > 20) cols = 2; // 切片列數 // 讀取源圖像
            BufferedImage bi = ImageIO.read(new File(srcImageFile)); int srcWidth = bi.getHeight(); // 源圖寬度
            int srcHeight = bi.getWidth(); // 源圖高度
            if (srcWidth > 0 && srcHeight > 0) { Image img; ImageFilter cropFilter; Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT); int destWidth = srcWidth; // 每張切片的寬度
                int destHeight = srcHeight; // 每張切片的高度 // 計算切片的寬度和高度
                if (srcWidth % cols == 0) { destWidth = srcWidth / cols; } else { destWidth = (int) Math.floor(srcWidth / cols) + 1; } if (srcHeight % rows == 0) { destHeight = srcHeight / rows; } else { destHeight = (int) Math.floor(srcWidth / rows) + 1; } // 循環創建切片 // 改進的想法:是否可用多線程加快切割速度
                for (int i = 0; i < rows; i++) { for (int j = 0; j < cols; j++) { // 四個參數分別爲圖像起點座標和寬高 // 即: CropImageFilter(int x,int y,int width,int height)
                        cropFilter = new CropImageFilter(j * destWidth, i * destHeight, destWidth, destHeight); img = Toolkit.getDefaultToolkit().createImage( new FilteredImageSource(image.getSource(), cropFilter)); BufferedImage tag = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(img, 0, 0, null); // 繪製縮小後的圖
 g.dispose(); // 輸出爲文件
                        ImageIO.write(tag, "JPEG", new File(descDir + "_r" + i + "_c" + j + ".jpg")); } } } } catch (Exception e) { e.printStackTrace(); } } /** * 圖像切割（指定切片的寬度和高度） * * @param srcImageFile 源圖像地址 (絕對路徑) * @param descDir 切片目標文件夾 * @param destWidth 目標切片寬度。默認200 * @param destHeight 目標切片高度。默認150 */
    public final static void cut3(String srcImageFile, String descDir, int destWidth, int destHeight) { try { if (destWidth <= 0) destWidth = 200; // 切片寬度
            if (destHeight <= 0) destHeight = 150; // 切片高度 // 讀取源圖像
            BufferedImage bi = ImageIO.read(new File(srcImageFile)); int srcWidth = bi.getHeight(); // 源圖寬度
            int srcHeight = bi.getWidth(); // 源圖高度
            if (srcWidth > destWidth && srcHeight > destHeight) { Image img; ImageFilter cropFilter; Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT); int cols = 0; // 切片橫向數量
                int rows = 0; // 切片縱向數量 // 計算切片的橫向和縱向數量
                if (srcWidth % destWidth == 0) { cols = srcWidth / destWidth; } else { cols = (int) Math.floor(srcWidth / destWidth) + 1; } if (srcHeight % destHeight == 0) { rows = srcHeight / destHeight; } else { rows = (int) Math.floor(srcHeight / destHeight) + 1; } // 循環創建切片 // 改進的想法:是否可用多線程加快切割速度
                for (int i = 0; i < rows; i++) { for (int j = 0; j < cols; j++) { // 四個參數分別爲圖像起點座標和寬高 // 即: CropImageFilter(int x,int y,int width,int height)
                        cropFilter = new CropImageFilter(j * destWidth, i * destHeight, destWidth, destHeight); img = Toolkit.getDefaultToolkit().createImage( new FilteredImageSource(image.getSource(), cropFilter)); BufferedImage tag = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(img, 0, 0, null); // 繪製縮小後的圖
 g.dispose(); // 輸出爲文件
                        ImageIO.write(tag, "JPEG", new File(descDir + "_r" + i + "_c" + j + ".jpg")); } } } } catch (Exception e) { e.printStackTrace(); } } /** * 圖像類型轉換：GIF->JPG、GIF->PNG、PNG->JPG、PNG->GIF(X)、BMP->PNG * * @param srcImageFile 源圖像地址 (絕對路徑) * @param formatName 包含格式非正式名稱的 String：如JPG、JPEG、GIF等 * @param destImageFile 目標圖像地址 (絕對路徑) */
    public final static void convert(String srcImageFile, String formatName, String destImageFile) { try { File f = new File(srcImageFile); f.canRead(); f.canWrite(); BufferedImage src = ImageIO.read(f); ImageIO.write(src, formatName, new File(destImageFile)); } catch (Exception e) { e.printStackTrace(); } } /** * 彩色轉爲黑白 * * @param srcImageFile 源圖像地址 (絕對路徑) * @param destImageFile 目標圖像地址 (絕對路徑) */
    public final static void gray(String srcImageFile, String destImageFile) { try { BufferedImage src = ImageIO.read(new File(srcImageFile)); ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY); ColorConvertOp op = new ColorConvertOp(cs, null); src = op.filter(src, null); ImageIO.write(src, "JPEG", new File(destImageFile)); } catch (IOException e) { e.printStackTrace(); } } /** * 給圖片添加文字水印 * * @param pressText 水印文字 * @param srcImageFile 源圖像地址 (絕對路徑) * @param destImageFile 目標圖像地址 (絕對路徑) * @param fontName 水印的字體名稱 * @param fontStyle 水印的字體樣式 * @param color 水印的字體顏色 * @param fontSize 水印的字體大小 * @param x 修正值 * @param y 修正值 * @param alpha 透明度：alpha 必須是範圍 [0.0, 1.0] 以內（包含邊界值）的一個浮點數字 */
    public final static void pressText(String pressText, String srcImageFile, String destImageFile, String fontName, int fontStyle, Color color, int fontSize, int x, int y, float alpha) { try { File img = new File(srcImageFile); Image src = ImageIO.read(img); int width = src.getWidth(null); int height = src.getHeight(null); BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.drawImage(src, 0, 0, width, height, null); g.setColor(color); g.setFont(new Font(fontName, fontStyle, fontSize)); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 在指定座標繪製水印文字
            g.drawString(pressText, (width - (getLength(pressText) * fontSize)) / 2 + x, (height - fontSize) / 2 + y); g.dispose(); ImageIO.write((BufferedImage) image, "JPEG", new File(destImageFile));// 輸出到文件流
        } catch (Exception e) { e.printStackTrace(); } } /** * 給圖片添加文字水印 * * @param pressText 水印文字 * @param srcImageFile 源圖像地址 (絕對路徑) * @param destImageFile 目標圖像地址 (絕對路徑) * @param fontName 字體名稱 * @param fontStyle 字體樣式 * @param color 字體顏色 * @param fontSize 字體大小 * @param x 修正值 * @param y 修正值 * @param alpha 透明度：alpha 必須是範圍 [0.0, 1.0] 以內（包含邊界值）的一個浮點數字 */
    public final static void pressText2(String pressText, String srcImageFile, String destImageFile, String fontName, int fontStyle, Color color, int fontSize, int x, int y, float alpha) { try { File img = new File(srcImageFile); Image src = ImageIO.read(img); int width = src.getWidth(null); int height = src.getHeight(null); BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.drawImage(src, 0, 0, width, height, null); g.setColor(color); g.setFont(new Font(fontName, fontStyle, fontSize)); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 在指定座標繪製水印文字
            g.drawString(pressText, (width - (getLength(pressText) * fontSize)) / 2 + x, (height - fontSize) / 2 + y); g.dispose(); ImageIO.write((BufferedImage) image, "JPEG", new File(destImageFile)); } catch (Exception e) { e.printStackTrace(); } } /** * 給圖片添加圖片水印 * * @param pressImg 水印圖片 (絕對路徑) * @param srcImageFile 源圖像地址 (絕對路徑) * @param destImageFile 目標圖像地址 (絕對路徑) * @param x 修正值。 默認在中間 * @param y 修正值。 默認在中間 * @param alpha 透明度：alpha 必須是範圍 [0.0, 1.0] 以內（包含邊界值）的一個浮點數字 */
    public final static void pressImage(String pressImg, String srcImageFile, String destImageFile, int x, int y, float alpha) { try { File img = new File(srcImageFile); Image src = ImageIO.read(img); int wideth = src.getWidth(null); int height = src.getHeight(null); BufferedImage image = new BufferedImage(wideth, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.drawImage(src, 0, 0, wideth, height, null); // 水印文件
            Image src_biao = ImageIO.read(new File(pressImg)); int wideth_biao = src_biao.getWidth(null); int height_biao = src_biao.getHeight(null); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); g.drawImage(src_biao, (wideth - wideth_biao) / 2, (height - height_biao) / 2, wideth_biao, height_biao, null); // 水印文件結束
 g.dispose(); ImageIO.write((BufferedImage) image, "JPEG", new File(destImageFile)); } catch (Exception e) { e.printStackTrace(); } } /** * 計算text的長度（一箇中文算兩個字符） * * @param text * @return
     */
    public final static int getLength(String text) { int length = 0; for (int i = 0; i < text.length(); i++) { if (new String(text.charAt(i) + "").getBytes().length > 1) { length += 2; } else { length += 1; } } return length / 2; } }