内容含:图片处理工具类;以图片压缩为例 ,编写调用实例
第一步:框架中加入配置文件application.properties图片压缩后指定的高宽在此配置文件中配置
内容为:
- image.width=150
- image.height=150
第二步:框架中加入配置文件加载操作类,详情见:http://lucien-zzy.iteye.com/admin/blogs/2009495
第三步:编写图片处理工具类
- /**
- * 图片处理工具
- * @author ziyuzhang
- *
- */
- public class ImageUtil {
- private static final int BUFFER_SIZE = 16 * 1024;
- /**
- * 处理图片并保存 一张原图和一张缩小后的图片 小图可用于手机端
- * @param upload 大图对象
- * @param uploadFileName 图片原名
- * @param webPath 工程部署的绝对地址
- * @param filePath 图片目录
- * @return 为一字符数字,0位置 为原图片位置,1位置为压缩后图片位置,2位置为压缩后图片高度,3位置为压缩后图片宽度,4位置为压缩后图片大小
- */
- public static String[] uploadImages(File upload, String uploadFileName,String webPath,String filePath) {
- StringTokenizer tokenizer = new StringTokenizer(uploadFileName, ".");
- String ext="";
- while(tokenizer.hasMoreTokens()){
- ext = tokenizer.nextToken();
- }
- //大图的名字
- String filename = ImageUtil.getUUID()+"."+ext;
- //保存大图
- if(!ImageUtil.saveFile(upload,webPath,filePath,filename)){
- return null;
- }
- String afterFileName = ImageUtil.getUUID();
- //小图的名字
- String smallname = afterFileName + "." + ext;
- String smallPath = webPath + filePath + smallname;
- // 产生一张新的截图
- String[] fileinfo = ImageUtil.resizeImage(upload, smallPath,ConfigUtil.getIntValue("image.width"),
- ConfigUtil.getIntValue("image.height"),ext);
- if(null == fileinfo){
- return new String[]{"/" + filePath + filename,"/" + filePath + filename,
- null,null,null};
- }else{
- return new String[]{"/" + filePath + filename,"/" + filePath + smallname,
- fileinfo[0],fileinfo[1],fileinfo[2]};
- }
- }
- /**
- * 对应图片key为 upload
- * 保存附件 限制大小100M
- * @param response
- * @param request
- * @return
- */
- public static String getfile(HttpServletResponse response,HttpServletRequest request) {
- SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
- // 根据服务器的文件保存地址找到项目部署的绝对地址
- String webPath = ServletActionContext.getServletContext().getRealPath("/") ;
- String filePath ="upload/"+sdf.format(new Date())+"/";
- //文件保存目录路径
- String savePath = webPath+ "upload/";
- //最大文件大小
- long maxSize = 1024*1024*100;
- response.setContentType("text/html; charset=UTF-8");
- if (!ServletFileUpload.isMultipartContent(request)) {
- return "erro";
- }
- //如果目录不存在则创建
- if (!(new File(savePath).exists())) {
- if (!(new File(savePath).mkdirs())) {
- return "erro";
- }
- }
- //检查目录写权限
- if (!(new File(savePath)).canWrite()) {
- return "erro";
- }
- MultiPartRequestWrapper mul = (MultiPartRequestWrapper)request;
- File[] imageFiles = mul.getFiles("upload");
- String[] filesss = mul.getFileNames("upload");
- if (imageFiles != null && imageFiles.length >0) {
- String fileName = filesss[0];
- long fileSize = imageFiles[0].length();
- //检查文件大小
- if (fileSize > maxSize) {
- return "erro";
- }
- //检查扩展名
- String fileExt = fileName.substring(
- fileName.lastIndexOf(".") + 1).toLowerCase();
- SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
- String newFileName = df.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt;
- //保存图片到硬盘
- ImageUtil.saveFile(imageFiles[0], webPath, filePath, newFileName);
- filePath = webPath + filePath+newFileName ;
- }
- return filePath;
- }
- /**
- * 将文件保存到制定位置,路径不存在自动创建
- *
- * @param file
- * 要保存的文件
- * @param webPath
- * 工程部署的绝对路径
- * @param filePath
- * 文件夹的相对路径
- * @param filename
- * 文件名
- * @return
- */
- public static boolean saveFile(File file, String webPath, String filePath,
- String filename) {
- if (new File(webPath + filePath).exists()) {
- webPath = webPath + filePath + "/" + filename;
- File dstFile = new File(webPath);
- if (copy(file, dstFile)) {
- return true;
- }
- } else {
- if (new File(webPath + filePath).mkdirs()) {
- webPath = webPath + filePath + "/" + filename;
- File dstFile = new File(webPath);
- if (copy(file, dstFile)) {
- return true;
- }
- }
- }
- return false;
- }
- /**
- * 把源文件对象复制成目标文件对象
- *
- * @param src
- * 源文件
- * @param dst
- * 目标文件
- * @return
- */
- public static boolean copy(File src, File dst) {
- boolean result = false;
- InputStream in = null;
- OutputStream out = null;
- try {
- in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE);
- out = new BufferedOutputStream(new FileOutputStream(dst),
- BUFFER_SIZE);
- byte[] buffer = new byte[BUFFER_SIZE];
- int len = 0;
- while ((len = in.read(buffer)) > 0) {
- out.write(buffer, 0, len);
- }
- result = true;
- } catch (Exception e) {
- e.printStackTrace();
- result = false;
- } finally {
- if (null != in) {
- try {
- in.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- if (null != out) {
- try {
- out.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- return result;
- }
- /**
- * 接收File输出图片
- * 以图片高为标准 按比例缩减图片
- * @param file
- * 原图片对象
- * @param writePath
- * 小图片存放的路径
- * @param width
- * 宽
- * @param height
- * 高
- * @param format
- * 图片格式
- * @return
- */
- public static String[] resizeImage(File file, String writePath,
- Integer width, Integer height, String format) {
- try {
- BufferedImage inputBufImage = ImageIO.read(file);
- inputBufImage.getType();
- System.out.println("转前图片高度和宽度:" + inputBufImage.getHeight() + ":"
- + inputBufImage.getWidth());
- if(height >=inputBufImage.getHeight() || width >= inputBufImage.getWidth()){
- return null;
- }else{
- //double dd = inputBufImage.getHeight() / height;
- //width = (int) (inputBufImage.getWidth() / dd);
- //height = (int) (inputBufImage.getHeight() / dd);
- // 转换
- ResampleOp resampleOp = new ResampleOp(width, height);
- BufferedImage rescaledTomato = resampleOp.filter(inputBufImage,null);
- File fil = new File(writePath);
- ImageIO.write(rescaledTomato, format,fil);
- System.out.println("转后图片高度和宽度:" + rescaledTomato.getHeight() + ":"
- + rescaledTomato.getWidth());
- return new String[]{rescaledTomato.getHeight()+"",rescaledTomato.getWidth()+"",fil.length()+""};
- }
- } catch (IOException e) {
- e.printStackTrace();
- return null;
- }
- }
- public static String lastname(String name) {
- String[] ls = name.split("\\.");
- return ls[ls.length - 1];
- }
- public static String getUUID() {
- return UUID.randomUUID().toString().replaceAll("-", "");
- }
- }
第四步:Action中调用工具中的图片压缩功能
属性:
- // 图片文件上传
- private File[] image;
- private String[] imageFileName;
- private String[] imageContentType;
并提供get set
具体调用:
- Nursetb nursetb = new Nursetb();
- // 根据服务器的文件保存地址找到项目部署的绝对地址
- String webPath = ServletActionContext.getServletContext().getRealPath("/");
- System.out.println(webPath);
- String filePath = "upload/nurimage/"
- + new SimpleDateFormat("yyyyMMdd").format(new Date()) + "/";
- String names[] = null;
- if(null != this.getImage() && this.getImage()[0].length() > 0){
- names = ImageUtil.uploadImages(this.getImage()[0],
- this.getImageFileName()[0], webPath, filePath);
- }
- String imgurl = null;
- if(null!=names){
- imgurl = request.getContextPath()+names[1];
- nursetb.setImgurl(imgurl);
- }