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裁剪圖片是很常見的一個操作 js 圖片處理

小知識js 圖片處理



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裁剪圖片是很常見的一個操作 js 圖片處理

文章插圖
項目需求有個功能要實現頭像，讓我這個后端開發來做這個確實有點為難，結合網上大神的例子，做了個簡單的功能，以備不時之需
實現效果
頁面+js
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";response.setHeader("Pragma","No-cache");response.setHeader("Cache-Control","no-cache");%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base ><title>My JSP 'face.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" >--><%--<link rel="stylesheet" /> --%><link rel="stylesheet" /><link rel="stylesheet" /><script type="text/javascript" src="http://www.mnbkw.com/jxjc/171756/static/js/jquery-1.9.1.min.js"></script><script type="text/javascript" src="http://www.mnbkw.com/jxjc/171756/static/js/ajaxfileupload.js"></script><script type="text/javascript" src="http://www.mnbkw.com/jxjc/171756/static/js/bootstrap.js"></script><script type="text/javascript" src="http://www.mnbkw.com/jxjc/171756/static/js/jquery.json-2.4.js" charset="UTF-8"></script><script type="text/javascript" src="http://www.mnbkw.com/jxjc/171756/static/js/jquery.validate.js"></script><script type="text/javascript" src="http://www.mnbkw.com/jxjc/171756/static/js/jquery.Jcrop.js"></script><script type="text/javascript">/* jcrop對象，全局變量方便操作 */var api = null;/* 原圖寬度 */var boundx;/* 原圖高度 */var boundy;/* 選擇圖片事件 */function readURL(URL){var reader = new FileReader();reader.readAsDataURL(URL.files[0]);reader.onload = function(e){$("#faceId").removeAttr("src");$("#lookId").removeAttr("src");$("#faceId").attr("src",e.target.result);$("#lookId").attr("src",e.target.result);$("#faceId").Jcrop({onChange: showPreview,onSelect: showPreview,aspectRatio: 1,boxWidth:600},function(){// Use the API to get the real image size//使用API來獲得真實的圖像大小var bounds = this.getBounds();boundx = bounds[0];boundy = bounds[1];// Store the API in the jcrop_api variable//jcrop_api變量中存儲APIapi = this;$("#boundx").val(boundx);$("#boundy").val(boundy);});};/* 移除jcrop */if (api != undefined) {api.destroy();}//簡單的事件處理程序，響應自onChange,onSelect事件，按照上面的Jcrop調用function showPreview(coords){/* 設置剪切參數 */$("#x").val(coords.x);$("#y").val(coords.y);$("#w").val(coords.w);$("#h").val(coords.h);if(parseInt(coords.w) > 0){//計算預覽區域圖片縮放的比例，通過計算顯示區域的寬度(與高度)與剪裁的寬度(與高度)之比得到var rx = $("#preview_box").width() / coords.w;var ry = $("#preview_box").height() / coords.h;$("#lookId").css({width:Math.round(rx * $("#faceId").width()) + "px", //預覽圖片寬度為計算比例值與原圖片寬度的乘積height:Math.round(rx * $("#faceId").height()) + "px",//預覽圖片高度為計算比例值與原圖片高度的乘積marginLeft:"-" + Math.round(rx * coords.x) + "px",marginTop:"-" + Math.round(ry * coords.y) + "px"});}}}</script></head><body><form name="form" action="<%=basePath%>faceUpload.do" class="form-horizontal" method="post" enctype="multipart/form-data"><dir></dir><div style="margin-top: 10;margin-left: 30%"><table><tr><td><span>頭像：</span><input class="photo-file" type="file" name="imgFile" id="imgFile" onchange="readURL(this) " /></td><td><!----><img id = "faceId" src="http://www.mnbkw.com/jxjc/171756/static/img/1.jpg" class="jcrop-preview" alt="附件"><!-- 圖片長寬高隱藏域 --><input type="hidden" id="x" name="x" /><input type="hidden" id="y" name="y" /><input type="hidden" id="w" name="w" /><input type="hidden" id="h" name="h" /><input type="hidden" id="boundx" name="boundx" ><input type="hidden" id="boundy" name="boundy" ></td></tr><tr><td><span>頭像預覽：</span></td><td ><div style="width: 200px;height: 200px;overflow: hidden;" id = "preview_box"><img id = "lookId" src="http://www.mnbkw.com/jxjc/171756/static/img/1.jpg" class="jcrop-preview" alt="預覽" ></div></td></tr><tr><td><span>用戶名：</span><input type="text" id ="userName" name ="userName"></td><td ><span>藝名：</span><input type="text" id ="artName" name ="artName" ></td></tr></table><div class="modal-footer"><button id="submit" onclick="">上傳</button></div></div></form></body></html>后端控制器
package com.lovo.controller;import java.io.File;import java.text.SimpleDateFormat;import java.util.Date;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.log4j.Logger;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.multipart.MultipartFile;import com.lovo.utils.CutImgeUtil;import com.lovo.utils.FileUploadCheck;@Controllerpublic class FaceController {private static Logger logger = Logger.getLogger(FaceController.class);@RequestMapping(value = "http://www.mnbkw.com/faceUpload.do",method = RequestMethod.POST)public void faceLoginController(HttpServletRequest request,HttpServletResponse response,Model model,@RequestParam("imgFile") MultipartFile imgFile,String userName,String artName){//剪裁圖片坐標String x = request.getParameter("x");String y = request.getParameter("y");String w = request.getParameter("w");String h = request.getParameter("h");//原始圖片坐標String boundx = request.getParameter("boundx");String boundy = request.getParameter("boundy");//切圖參數int imgeX = (int) Double.parseDouble(x);int imgeY = (int) Double.parseDouble(y);int imegW = (int) Double.parseDouble(w);int imgeH = (int) Double.parseDouble(h);int srcX = (int) Double.parseDouble(boundx);int srcY = (int) Double.parseDouble(boundy);//文件保存文件夾String path = request.getSession().getServletContext().getRealPath("/")+"fileUpload"+File.separator;//文件重命名Date day = new Date();SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");String newName = sdf.format(day)+System.currentTimeMillis()+".jpg";try{//處理頭像附件if(imgFile !=null){//判斷是否為圖片文件if(FileUploadCheck.allowUpload(imgFile.getContentType())){boolean cut = CutImgeUtil.cutImge(imgFile.getInputStream(), imgeX, imgeY, imegW, imgeH, srcX, srcY, path+newName);if(cut){//當頭像剪切成功進行用戶信息數據庫存儲System.out.println(userName+" "+artName+" "+newName);}}}} catch (Exception e){e.printStackTrace();logger.error("上傳失敗");}}}【裁剪圖片是很常見的一個操作 js 圖片處理】工具類
package com.lovo.utils;import java.awt.Graphics;import java.awt.Image;import java.awt.Toolkit;import java.awt.image.BufferedImage;import java.awt.image.CropImageFilter;import java.awt.image.FilteredImageSource;import java.awt.image.ImageFilter;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.InputStream;import javax.imageio.ImageIO;import org.apache.log4j.Logger;public class CutImgeUtil {private static Logger logger = Logger.getLogger(CutImgeUtil.class);/*** 圖片剪切工具類* @param input 圖片輸入流* @param x 截取時的x坐標* @param y 截取時的y坐標* @param desWidth 截取的寬度* @param desHeight 截取的高度* @param srcWidth 頁面圖片的寬度* @param srcHeight 頁面圖片的高度* @param newFilePath 保存路徑+文件名* @return*/public static boolean cutImge(InputStream input, int x, int y, int desWidth, int desHeight, int srcWidth,int srcHeight,String newFilePath){boolean cutFlag = true;try{//圖片類Image imge ;ImageFilter cropFilter;//讀取圖片BufferedImage bi = ImageIO.read(input);//當剪裁大小小于原始圖片大小才執行if(srcWidth >= desWidth && srcHeight >= desHeight){//獲取原始圖Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);//獲取新圖cropFilter = new CropImageFilter(x, y, desWidth, desHeight);imge = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));BufferedImage tag = new BufferedImage(desWidth, desHeight, BufferedImage.TYPE_INT_RGB);Graphics g = tag.getGraphics();g.drawImage(imge, 0, 0, null);g.dispose();File out = new File(newFilePath);// 輸出文件ImageIO.write(tag, "JPEG", out);}} catch (Exception e){cutFlag = false;e.printStackTrace();logger.error("剪切失敗");}return cutFlag;}}package com.lovo.utils;import java.util.Arrays;import java.util.List;public class FileUploadCheck {//支持的文件類型public static final List<String> ALLOW_TYPES = Arrays.asList("image/jpg","image/jpeg","image/png","image/gif");//校驗文件類型是否是被允許的public static boolean allowUpload(String postfix){return ALLOW_TYPES.contains(postfix);}}