一、自动根据系统获取文件路径存储路径的工具类(图片的根路径和图片的子路径)PathUtil
package com.imooc.o2o.util;
public class PathUtil {
private static String seperator = System.getProperty("file.separator");
// 1、设置根据系统不同存储不同的位置
public static String getImgBasePath() {
String os = System.getProperty("os.name");
String basePath = "";
if (os.toLowerCase().startsWith("win")) {
basePath = "D:/projectdev/image";
} else {
basePath = "/Users/baidu/work/image";
}
// 2、对获取到的路径进行格式统一
basePath = basePath.replace("/", seperator);
// 3、返回存储路径
return basePath;
}
// 4、图片存储的子路径
public static String getShopImagePath(long shopId) {
String imagePath = "/upload/images/item/shop/" + shopId + "/";
return imagePath.replace("/", seperator);
}
}
二、图片处理的工具类 ImageUtil
1、图片加水印
2、缩略图处理
3、生成随机文件名
4、获取文件扩展名
5、创建目标路径所涉及到的目录
6、返回相对路径的目的是:我们是通过pathutil工具类自动获取文件存储地址的,当我们项目迁移,我们只需要修改pathutil的路径即可,不用修改数据库中保存的数据,极大的方便了项目的迁移
package com.imooc.o2o.util;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;
import javax.imageio.ImageIO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import com.imooc.o2o.dto.ImageHolder;
import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.geometry.Positions;
public class ImageUtil {
private static String basePath = Thread.currentThread().getContextClassLoader().getResource("").getPath();
private static final SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
private static final Random r = new Random();
private static Logger logger = LoggerFactory.getLogger(ImageUtil.class);
/**
* 将CommonsMultipartFile转换成File类
*
* @param cFile
* @return
*/
public static File transferCommonsMultipartFileToFile(CommonsMultipartFile cFile) {
File newFile = new File(cFile.getOriginalFilename());
try {
cFile.transferTo(newFile);
} catch (IllegalStateException e) {
logger.error(e.toString());
e.printStackTrace();
} catch (IOException e) {
logger.error(e.toString());
e.printStackTrace();
}
return newFile;
}
/**
* 处理缩略图,并返回新生成图片的相对值路径
*
* @param thumbnail
* @param targetAddr
* @return
*/
public static String generateThumbnail(ImageHolder thumbnail, String targetAddr) {
// 获取不重复的随机名
String realFileName = getRandomFileName();
// 获取文件的扩展名如png,jpg等
String extension = getFileExtension(thumbnail.getImageName());
// 如果目标路径不存在,则自动创建
makeDirPath(targetAddr);
// 获取文件存储的相对路径(带文件名)
String relativeAddr = targetAddr + realFileName + extension;
logger.debug("current relativeAddr is :" + relativeAddr);
// 获取文件要保存到的目标路径
File dest = new File(PathUtil.getImgBasePath() + relativeAddr);
logger.debug("current complete addr is :" + PathUtil.getImgBasePath() + relativeAddr);
logger.debug("basePath is :" + basePath);
// 调用Thumbnails生成带有水印的图片
try {
Thumbnails.of(thumbnail.getImage()).size(200, 200)
.watermark(Positions.BOTTOM_RIGHT, ImageIO.read(new File(basePath + "/watermark.jpg")), 0.25f)
.outputQuality(0.8f).toFile(dest);
} catch (IOException e) {
logger.error(e.toString());
throw new RuntimeException("创建缩略图失败:" + e.toString());
}
// 返回图片相对路径地址
return relativeAddr;
}
/**
* 处理详情图,并返回新生成图片的相对值路径
*
* @param thumbnail
* @param targetAddr
* @return
*/
public static String generateNormalImg(ImageHolder thumbnail, String targetAddr) {
// 获取不重复的随机名
String realFileName = getRandomFileName();
// 获取文件的扩展名如png,jpg等
String extension = getFileExtension(thumbnail.getImageName());
// 如果目标路径不存在,则自动创建
makeDirPath(targetAddr);
// 获取文件存储的相对路径(带文件名)
String relativeAddr = targetAddr + realFileName + extension;
logger.debug("current relativeAddr is :" + relativeAddr);
// 获取文件要保存到的目标路径
File dest = new File(PathUtil.getImgBasePath() + relativeAddr);
logger.debug("current complete addr is :" + PathUtil.getImgBasePath() + relativeAddr);
// 调用Thumbnails生成带有水印的图片
try {
Thumbnails.of(thumbnail.getImage()).size(337, 640)
.watermark(Positions.BOTTOM_RIGHT, ImageIO.read(new File(basePath + "/watermark.jpg")), 0.25f)
.outputQuality(0.9f).toFile(dest);
} catch (IOException e) {
logger.error(e.toString());
throw new RuntimeException("创建缩图片失败:" + e.toString());
}
// 返回图片相对路径地址
return relativeAddr;
}
/**
* 创建目标路径所涉及到的目录,即/home/work/xiangze/xxx.jpg, 那么 home work xiangze
* 这三个文件夹都得自动创建
*
* @param targetAddr
*/
private static void makeDirPath(String targetAddr) {
String realFileParentPath = PathUtil.getImgBasePath() + targetAddr;
File dirPath = new File(realFileParentPath);
if (!dirPath.exists()) {
dirPath.mkdirs();
}
}
/**
* 获取输入文件流的扩展名
*
* @param thumbnail
* @return
*/
private static String getFileExtension(String fileName) {
return fileName.substring(fileName.lastIndexOf("."));
}
/**
* 生成随机文件名,当前年月日小时分钟秒钟+五位随机数
*
* @return
*/
public static String getRandomFileName() {
// 获取随机的五位数
int rannum = r.nextInt(89999) + 10000;
String nowTimeStr = sDateFormat.format(new Date());
return nowTimeStr + rannum;
}
public static void main(String[] args) throws IOException {
Thumbnails.of(new File("/Users/baidu/work/image/xiaohuangren.jpg")).size(200, 200)
.watermark(Positions.BOTTOM_RIGHT, ImageIO.read(new File(basePath + "/watermark.jpg")), 0.25f)
.outputQuality(0.8f).toFile("/Users/baidu/work/image/xiaohuangrennew.jpg");
}
/**
* storePath是文件的路径还是目录的路径, 如果storePath是文件路径则删除该文件,
* 如果storePath是目录路径则删除该目录下的所有文件
*
* @param storePath
*/
public static void deleteFileOrPath(String storePath) {
File fileOrPath = new File(PathUtil.getImgBasePath() + storePath);
if (fileOrPath.exists()) {
if (fileOrPath.isDirectory()) {
File files[] = fileOrPath.listFiles();
for (int i = 0; i < files.length; i++) {
files[i].delete();
}
}
fileOrPath.delete();
}
}
}
三、图片工具类的使用
1、前端通过图片上传控件上传图片
①不同的前端工具,上传控件不同,以此为例
<input type="file" id="shop-img">
②获取上传的图片文件流
var shopImg = $('#shop-img')[0].files[0];
③将图片文件流通过formData
//生成表单对象,用于接收参数并传递给后台
var formData = new FormData();
// 添加图片流进表单对象里
formData.append('shopImg', shopImg);
④通过ajax方式传输到后台,也可以直接通过form表单的形式提交
$.ajax({
url : (isEdit ? editShopUrl : registerShopUrl),
type : 'POST',
data : formData,
contentType : false,
processData : false,
cache : false,
success : function(data) {
if (data.success) {
$.toast('提交成功!');
if (!isEdit) {
// 若为注册操作,成功后返回店铺列表页
window.location.href = "/o2o/shopadmin/shoplist";
}
} else {
$.toast('提交失败!' + data.errMsg);
}
// 点击验证码图片的时候,注册码会改变
$('#captcha_img').click();
}
});
2、后端从request中剥离图片,文件流转换成java.io.file
CommonsMultipartFile shopImg = null;
CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
if (commonsMultipartResolver.isMultipart(request)) {
MultipartHttpServletRequest multipartHttpServletRequest =(MultipartHttpServletRequest) request;
shopImg = (CommonsMultipartFile) multipartHttpServletRequest.getFile("shopImg");//参数中的shopImg是前端原定好的名称
} else {
modelMap.put("success", false);
modelMap.put("errMsg", "上传图片不能为空");
return modelMap;
}
3、对图片进行存储
①定义图片属性类
package com.imooc.o2o.dto;
import java.io.InputStream;
public class ImageHolder {
private String imageName;
private InputStream image;
public ImageHolder(String imageName, InputStream image) {
this.imageName = imageName;
this.image = image;
}
public String getImageName() {
return imageName;
}
public void setImageName(String imageName) {
this.imageName = imageName;
}
public InputStream getImage() {
return image;
}
public void setImage(InputStream image) {
this.image = image;
}
}
②存储
//File是能直接通过读取路径产生文件流inputStream
//文件名是为了generateThumbnail中通过文件名获取其扩展名
private void addShopImg(Shop shop, ImageHolder thumbnail) {
// 获取shop图片目录的相对值路径
String dest = PathUtil.getShopImagePath(shop.getShopId());
String shopImgAddr = ImageUtil.generateThumbnail(thumbnail, dest);
shop.setShopImg(shopImgAddr);
}
以上代码详情可见o2o项目源码