pom依賴

     <!--圖片處理相關類-->
    <!-- https://mvnrepository.com/artifact/net.coobird/thumbnailator -->
    <dependency>
        <groupId>net.coobird</groupId>
        <artifactId>thumbnailator</artifactId>
        <version>0.4.8</version>
    </dependency>

路徑工具 

//路徑工具類
public class FileUtil {}

private static String seperator = System.getProperty("file.separator");
private static final SimpleDateFormat sDateFormate=new SimpleDateFormat("yyyyMMddHHmmss");
private static final Random r = new Random();

//設定圖片的路徑 對不同的系統又不同路徑
public static String getImgBasePath(){
    String os=System.getProperty("os.name"
 
);
    String basePath;
    if((os.toLowerCase().startsWith("win"))){
        basePath="D:/workspace/o2oImage";
    }else{
        basePath="/home/o2oImage/";
    }
    basePath=basePath.replace("/", seperator);
    return basePath;
}

//設定所傳入圖片的檔名
public static String getShopImagePath(long shopId) {
    StringBuilder shopImagePathBuilder = new
 
 StringBuilder();
    shopImagePathBuilder.append("upload/images/item/shop/");
    shopImagePathBuilder.append(shopId);
    shopImagePathBuilder.append("/");
    String shopImagePath = shopImagePathBuilder.toString().replace("/",seperator);
    return shopImagePath;
}

//重新設定檔名(時間+五位隨機數) 防重名
public static String getRandomFileName(){
    int ramnum=r.nextInt(9999)+10000;
    String nowTimeStr=sDateFormate.format(new Date());      
    return nowTimeStr+ramnum;       
}   

圖片上傳工具

public class ImageUtil {}

程式碼如下

導包

package com.imooc.o2o.util;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

import org.slf4j.LoggerFactory;

import ch.qos.logback.classic.Logger;

import net.coobird.thumbnailator.Thumbnails;

import net.coobird.thumbnailator.geometry.Positions;

通過反射獲得水印圖片的路徑

public static String basePath=Thread.currentThread()

.getContextClassLoader()

.getResource("")

.getPath();

//建立略縮圖         且打水印                                                                      
public static String generateThumbnail(File thumbnail ,String targetAddr ){

    String realFileName=FileUtil.getRandomFileName();
    String extension=getFileExtension(thumbnail);
    makeDirPath(targetAddr);
    String relativeAddr=targetAddr+realFileName+extension;

    File dest=new File(FileUtil.getImgBasePath()+relativeAddr);
    try {
        //給圖片打水印
        Thumbnails.of(thumbnail).size(200,200).
        watermark(Positions.BOTTOM_RIGHT,ImageIO.read(new File(basePath+"/watermark.jpg")), 0.5f)
        .outputQuality(0.8f).toFile(dest);
    } catch (IOException e) {
        throw new RuntimeException("建立略縮圖失敗"+e.toString());
    }
    return relativeAddr;        
}

//建立普通大小的圖片
public static String generateNormalImg(File thumbnail, String targetAddr) {
    String realFileName = FileUtil.getRandomFileName();
    String extension = getFileExtension(thumbnail);
    makeDirPath(targetAddr);
    String relativeAddr = targetAddr + realFileName + extension;
    File dest = new File(FileUtil.getImgBasePath() + relativeAddr);
    try {
        Thumbnails.of(thumbnail).size(337, 640).outputQuality(0.5f).toFile(dest);
    } catch (IOException e) {
        throw new RuntimeException("建立縮圖失敗：" + e.toString());
    }
    return relativeAddr;
}

//就建立相關的路徑
private static void makeDirPath(String targetAddr) {
    String realFileParentPath = FileUtil.getImgBasePath() + targetAddr;
    File dirPath = new File(realFileParentPath);
    if (!dirPath.exists()) {
        dirPath.mkdirs();
    }
}
//獲得上傳檔案的拓展名
private static String getFileExtension(File file) {
    String originalFileName =file.getName();
    return originalFileName.substring(originalFileName.lastIndexOf("."));
}