struts2实现上传文件、生成缩略图、添加文字和图片水印

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web application

Struts Spring json Apache Workflow

1、页面代码

代码:

<%@ page contentType="text/html;charset=UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<title>图片上传</title>
<script type="text/javascript">
        function upload(){
            var ff = document.forms.imageForm;
            var img = ff.file.value;
            if(img==null || img==""){
                alert("图片路径不允许为空！");
                return;
            }
            ff.target="_top";
            ff.method="post";
            ff.submit();
        }
    </script>

    </head>

    <body>
        <form id="imageForm" action="image.action"
            enctype="multipart/form-data">
            <p>
                ------------------------------

            </p>
            上传图片：
            <input name="file" type=file value=''>
            <br>
            <input type="button" value="上传" onclick="upload()"
                style="cursor: pointer">
        </form>
        <p>
            -------------------------------------------------
        </p>
        <div>
            <c:if test="${ipath!=null}">
                <img src="${ipath}">
            </c:if>
        <div>
        <div>
            <c:if test="${imgPath!=null}">
                <img src="${imgPath}">
            </c:if>
        </div>
    </body>
</html>

action代码

代码:

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
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.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;

import javax.imageio.ImageIO;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class ImageAction extends ActionSupport {

    /**
     * 图片上传、缩放、文字水印、图片水印
     */
    private static final long serialVersionUID = -8982586906724587883L;

    private Log log = LogFactory.getLog(getClass());

    private static final int BUFFER_SIZE = 16 * 1024;

    private static final String TEXT_TITLE = "文字水印";

    private static final String WATER_IMG_NAME = "rzx.gif";

    // 输入参数:上传过来的文件路径
    private File file;

    /**
     * 输入参数:文件名称由struts的拦截器默认赋值,注意setter的写法:file+fileName
     */
    private String fileName;

    /**
     * 输入参数由struts的拦截器默认赋值,注意setter的写法:file+contentType
     */
    private String contentType;

    // 输出参数
    private String imageFileName;

    // 输出参数:原图保存路径
    private String ipath;

    // 输出参数:缩略图保存路径
    private String imgPath;

    // 输出参数
    private String json;

    public ImageAction() {

    }

    @Override
    public String execute() throws Exception {
        return uploadImage();
    }

    /**
     * 得到文件名称
     *
     * @param fileName
     * @return
     */
    private String getExtention(String fileName) {
        int pos = fileName.lastIndexOf(".");
        return fileName.substring(pos);
    }

    /**
     * 拷贝
     *
     * @param file
     * @param imageFile
     * @throws Exception
     */
    private void copy(File src, File dist) throws Exception {
        log.debug("[src]--" + src);
        log.debug("[dist]--" + dist);

        try {
            InputStream in = null;
            OutputStream out = null;
            try {
                in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE);
                out = new BufferedOutputStream(new FileOutputStream(dist), BUFFER_SIZE);

                byte[] buf = new byte[BUFFER_SIZE];
                while (in.read(buf) > 0) {
                    out.write(buf);
                }
                out.close();
                in.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (in != null)
                    in.close();
                if (out != null)
                    out.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
            throw new Exception(e);
        }

    }

    /**
     * 图片上传
     *
     * @return
     */
    public String uploadImage() throws Exception {
        log.debug("[file]--" + file);
        log.debug("[file name]--" + fileName);
        imageFileName = new Date().getTime() + getExtention(fileName);

        // 得到文件存放路径
        log.debug("[imageFileName]--" + imageFileName);
        String dir = ServletActionContext.getServletContext().getRealPath("/UploadImages");
        File dirs = new File(dir);
        if (!dirs.exists())
            dirs.mkdir();

        // 使用原来的文件名保存图片
        String path = dir + "/" + fileName;
        File imageFile = new File(path);

        copy(file, imageFile);

        // 缩放
        zoom(imageFile);

        // 给大图添加文字水印
//      watermark(imageFile);
        // 给大图添加图片水印，可以是gif或png格式
        imageWaterMark(imageFile);

        // 创建子目录得到添加水印后的图片的存储路径,子目录只能一级一级的建
        String dist = dir + "/water";
        File outFile = new File(dist);
        if (!outFile.exists())
            outFile.mkdir();
        File sImgpath = new File(dist + "/" + fileName);

        // 给小图添加文字水印
    // watermark(sImgpath);
        // 给小图添加图片水印，可以是gif或png格式
        imageWaterMark(sImgpath);

        // 大图路径
        ipath = "UploadImages/" + fileName;
        // 小图路径
        imgPath = "UploadImages/water/" + fileName;

        return SUCCESS;
    }

    /**
     * 缩放处理
     *
     * @return
     */
    public void zoom(File imageFile) throws Exception {
        log.debug("[zoom][imageFile]--" + imageFile);
        try {

            // 缩略图存放路径
            File todir = new File(ServletActionContext.getServletContext().getRealPath("/UploadImages") + "/water");
            if (!todir.exists()) {
                todir.mkdir();
            }

            if (!imageFile.isFile())
                throw new Exception(imageFile + " is not image file error in CreateThumbnail!");

            File sImg = new File(todir, fileName);

            BufferedImage Bi = ImageIO.read(imageFile);
            // 假设图片宽高最大为130 80,使用默认缩略算法
            Image Itemp = Bi.getScaledInstance(130, 80, Bi.SCALE_DEFAULT);

            double Ratio = 0.0;
            if ((Bi.getHeight() > 130) || (Bi.getWidth() > 80)) {
                if (Bi.getHeight() > Bi.getWidth())
                    Ratio = 80.0 / Bi.getHeight();
                else
                    Ratio = 130.0 / Bi.getWidth();

                AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(Ratio, Ratio), null);
                Itemp = op.filter(Bi, null);
            }

            ImageIO.write((BufferedImage) Itemp, "jpg", sImg);

        } catch (IOException e) {
            e.printStackTrace();
            throw new Exception(e);
        }
    }

    /**
     * 添加文字水印
     *
     * @return
     * @throws Exception
     * @throws Exception
     */
    public void watermark(File img) throws Exception {
        log.debug("[watermark file name]--" + img.getPath());
        try {

            if (!img.exists()) {
                throw new IllegalArgumentException("file not found!");
            }

            log.debug("[watermark][img]--" + img);

            // 创建一个FileInputStream对象从源图片获取数据流
            FileInputStream sFile = new FileInputStream(img);

            // 创建一个Image对象并以源图片数据流填充
            Image src = ImageIO.read(sFile);

            // 得到源图宽
            int width = src.getWidth(null);
            // 得到源图长
            int height = src.getHeight(null);

            // 创建一个BufferedImage来作为图像操作容器
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            // 创建一个绘图环境来进行绘制图象
            Graphics2D g = image.createGraphics();
            // 将原图像数据流载入这个BufferedImage
            log.debug("width:" + width + " height:" + height);
            g.drawImage(src, 0, 0, width, height, null);
            // 设定文本字体
            g.setFont(new Font("宋体", Font.BOLD, 28));
            String rand = TEXT_TITLE;
            // 设定文本颜色
            g.setColor(Color.blue);
            // 设置透明度
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.5f));
            // 向BufferedImage写入文本字符,水印在图片上的坐标
            g.drawString(rand, width - (width - 20), height - (height - 60));
            // 使更改生效
            g.dispose();
            // 创建输出文件流
            FileOutputStream outi = new FileOutputStream(img);
            // 创建JPEG编码对象
            JPEGImageEncoder encodera = JPEGCodec.createJPEGEncoder(outi);
            // 对这个BufferedImage (image)进行JPEG编码
            encodera.encode(image);
            // 关闭输出文件流
            outi.close();
            sFile.close();

        } catch (IOException e) {
            e.printStackTrace();
            throw new Exception(e);
        }
    }

    /**
     * 添加图片水印
     *
     */
    public void imageWaterMark(File imgFile) throws Exception {
        try {
            // 目标文件
            Image src = ImageIO.read(imgFile);
            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);

            // 水印文件路径
            String waterImgPath = ServletActionContext.getServletContext().getRealPath("/UploadImages")+"/"+WATER_IMG_NAME;
            File waterFile = new File(waterImgPath);
            Image waterImg = ImageIO.read(waterFile);

            int w_wideth = waterImg.getWidth(null);
            int w_height = waterImg.getHeight(null);
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.5f));
            g.drawImage(waterImg, (wideth - w_wideth) / 2, (height - w_height) / 2, w_wideth, w_height, null);
            // 水印文件结束

            g.dispose();
            FileOutputStream out = new FileOutputStream(imgFile);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(image);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void setFile(File file) {
        this.file = file;
    }

    public String getIpath() {
        return ipath;
    }

    public void setFileFileName(String fileName) {
        this.fileName = fileName;
    }

    public void setImageFileName(String imageFileName) {
        this.imageFileName = imageFileName;
    }

    public String getJson() {
        return json;
    }

    public void setFileContentType(String fileContentType) {
        this.contentType = fileContentType;
    }

    public String getImgPath() {
        return imgPath;
    }

}

struts.xml配置文件

代码:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "struts-2.0.dtd" >
<struts>
    <include file="struts-default.xml" />

    <constant name="struts.objectFactory" value="spring" />
    <constant name="struts.devMode" value="false" />
    <constant name="struts.locale" value="zh_CN" />
    <constant name="struts.multipart.maxSize" value="10000000000000" />
    <constant name="struts.i18n.encoding" value="utf-8" />

    <package name="test" extends="struts-default">
        <interceptors>
            <interceptor-stack name="commonsStack">
                <interceptor-ref name="exception"></interceptor-ref>
                <interceptor-ref name="prepare" />
                <interceptor-ref name="params" />
                <interceptor-ref name="validation" />
                <interceptor-ref name="workflow" />
            </interceptor-stack>
            <interceptor-stack name="uploadStack">
                <interceptor-ref name="fileUpload">
                    
                    <param name="allowedTypes">
                        image/bmp,image/png,image/gif,image/jpeg,image/jpg
                    </param>
                    
                    <param name="maximumSize">50485760</param>
                    
                </interceptor-ref>
                <interceptor-ref name="commonsStack" />
            </interceptor-stack>
        </interceptors>

        
        <default-interceptor-ref name="commonsStack" />
    </package>

    <package name="image" extends="test">
        <action name="image" class="imageAction">
            <interceptor-ref name="uploadStack"></interceptor-ref>
            <result name="input">/image.jsp</result>
            <result name="success">/image.jsp</result>
        </action>
    </package>
</struts>

4、spring的配置比较简单就不贴了，在<beans>里加入一个bean就可以了。

以上完毕！

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2009-11-03 23:35
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