imgareaselect+java实现图片裁剪保存
1、需求包：
jquery.imgareaselect.js
jquery.imgareaselect.pack.js
jquery-1.6.1.min.js
ajaxfileupload-min.js
json-lib-2.3-jdk15.jar
commons-fileupload-1.2.2.jar
2、前端页面
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link href="css/imgareaselect-default.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" src="js/jquery-1.6.1.min.js"></script> <script type="text/javascript" src="js/ajaxfileupload-min.js"></script> <script type="text/javascript" src="js/jquery.imgareaselect.min.js"></script> <script type="text/javascript" src="js/jquery.imgareaselect.pack.js"></script> <script type="text/javascript" src="js/upload.js"></script> </head> <body> <input type="hidden" name="x1" value="0" /> <input type="hidden" name="y1" value="0" /> <input type="hidden" name="x2" value="100" /> <input type="hidden" name="y2" value="100" /> <input id="fileToUpload" name="fileToUpload" type="file" onchange="uploadImage();"/> <div id="facediv" style="display:none;z-index:100;"> <img id="face" /> </div> </body> </html>
function uploadImage() { $.ajaxFileUpload( { url : 'photo',// 需要链接到服务器地址 fileElementId : 'fileToUpload',// 文件选择框的id属性 dataType : 'json',// 服务器返回的格式，可以是json data : {"operation":1}, success : function(data) { if (data['result'] == 1) { $("#facediv").css({"display":"block"}); $("#face").attr("src",data['path']); $('<div><img src="' + data['path'] + '" style="position: relative;" /><div>') .css({ float: 'left', position: 'relative', overflow: 'hidden', width: '100px', height: '100px' }).insertAfter($('#face')); $('<button id="btnSubmit">提交</button>') .click(function (){ cutImage(data['path']); }).insertAfter($('#facediv')); $('#face').imgAreaSelect({ maxWidth: 100, maxHeight: 100, minWidth: 63, minHeight:63, x1:0,y1:0,x2:100,y2:100, aspectRatio: '1:1', onSelectChange: function (img, selection) { var scaleX = 100 / (selection.width || 1); var scaleY = 100 / (selection.height || 1); $('#face + div > img').css({ width: Math.round(scaleX * 400) + 'px', height: Math.round(scaleY * 300) + 'px', marginLeft: '-' + Math.round(scaleX * selection.x1) + 'px', marginTop: '-' + Math.round(scaleY * selection.y1) + 'px' }); }, onSelectEnd: function (img, selection) { $('input[name="x1"]').val(selection.x1); $('input[name="y1"]').val(selection.y1); $('input[name="x2"]').val(selection.x2); $('input[name="y2"]').val(selection.y2); } }); } }, error : function(data) { } }); } function cutImage(path) { $.ajax( { type : "POST", url:"photo", dateType:"json", data:{"operation":2,"x1":$('input[name="x1"]').val(), "x2":$('input[name="x2"]').val(), "y1":$('input[name="y1"]').val(), "y2":$('input[name="y2"]').val(), "path":path}, success : function(data) { top.location.href="photo_view.vm?path="+data["path"]; }, error:function(data) { } }); } 3、后台处理： public class PhotoServlet extends HttpServlet { private static final long serialVersionUID = 5653610348191435218L; @Override protected void doPost(HttpServletRequest request, HttpServletResponse resp) throws ServletException, IOException { String requestType = request.getContentType(); if (requestType != null && requestType.indexOf("multipart/form-data") != -1) { FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); List items; try { items = upload.parseRequest(request); Iterator iter = items.iterator(); String webRoot = request.getSession().getServletContext() .getRealPath("/"); while (iter.hasNext()) { FileItem item = (FileItem) iter.next(); if (!item.isFormField()) { String suffix = item.getName().substring(item.getName().lastIndexOf(".")); String name = String.valueOf(System.currentTimeMillis()); StringBuffer sourcePath = new StringBuffer(); sourcePath.append(webRoot); sourcePath.append(File.separator); sourcePath.append("tmp"); sourcePath.append(File.separator); sourcePath.append(name); sourcePath.append("_source"); sourcePath.append(suffix); File imageFile= new File(sourcePath.toString()); if (!imageFile.getParentFile().exists()) { imageFile.getParentFile().mkdirs(); } item.write(imageFile); JSONObject result = new JSONObject(); result.put("result", 1); result.put("path", "http://localhost:8080/testxml/tmp/" + imageFile.getName()); this.responseJSON(resp, result.toString()); break; } } } catch (FileUploadException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } else { 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 path = request.getParameter("path"); String fileName = path.substring(path.lastIndexOf("/")+1); String suffix = fileName.substring(fileName.lastIndexOf(".")); String webRoot = request.getSession().getServletContext().getRealPath("/"); StringBuffer sourcePath = new StringBuffer(); sourcePath.append(webRoot); sourcePath.append(File.separator); sourcePath.append("tmp"); sourcePath.append(File.separator); sourcePath.append(fileName); StringBuffer targetPath = new StringBuffer(); targetPath.append(webRoot); targetPath.append(File.separator); targetPath.append("tmp"); targetPath.append(File.separator); targetPath.append(fileName.substring(0, fileName.lastIndexOf("_"))); targetPath.append(suffix); cutImage(suffix.substring(1), sourcePath.toString(), targetPath.toString(), x1, y1, x2, y2); new File(sourcePath.toString()).delete(); JSONObject result = new JSONObject(); result.put("result", 1); result.put("path", "http://localhost:8080/testxml/tmp/" + fileName.substring(0, fileName.lastIndexOf("_")) + suffix); resp.setContentType("application/json"); this.responseJSON(resp, result.toString()); } } protected void responseJSON(HttpServletResponse response, String jsonStr) { response.setCharacterEncoding("utf-8"); PrintWriter writer; try { writer = response.getWriter(); writer.write(jsonStr); writer.flush(); } catch (IOException e) { } } public static void cutImage(String suffix, String sourcePath, String targetPath, int x1, int y1, int x2, int y2) { try { Image img; ImageFilter cropFilter; File sourceImgFile = new File(sourcePath); BufferedImage bi = ImageIO.read(sourceImgFile); int srcWidth = bi.getWidth(); int srcHeight = bi.getHeight(); int destWidth = x2 - x1; int destHeight = y2 - y1; if (srcWidth >= destWidth && srcHeight >= destHeight) { Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT); cropFilter = new CropImageFilter(x1, y1, 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); g.dispose(); ImageIO.write(tag, suffix, new File(targetPath)); } } catch (Exception e) { e.printStackTrace(); } } } 本文由用户 jopen 自行上传分享，仅供网友学习交流。所有权归原作者，若您的权利被侵害，请联系管理员。
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