项目需求有个功能要实现头像，让我这个后端开发来做这个确实有点为难，结合网上大神的例子，做了个简单的功能，以备不时之需
实现效果
页面+js
\\”>
<!– –><%– static/css/bootstrap.css\\”/> –%> static/css/common.css\\”/> static/css/jquery.Jcrop.css\\”/> static/js/jquery-1.9.1.min.js\\”> static/js/ajaxfileupload.js\\”> static/js/bootstrap.js\\”> static/js/jquery.json-2.4.js\\” charset=\\”UTF-8\\”> static/js/jquery.validate.js\\”> static/js/jquery.Jcrop.js\\”>
/* jcrop对象，全局变量方便操作 */ var api = null; /* 原图宽度 */ var boundx; /* 原图高度 */ var boundy;
/* 选择图片事件 */ 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来获得真实的图像大小 var bounds = this.getBounds(); boundx = bounds[0]; boundy = bounds[1]; // Store the API in the jcrop_api variable //jcrop_api变量中存储API api = this;
$(\\”#boundx\\”).val(boundx); $(\\”#boundy\\”).val(boundy);
}); }; /* 移除jcrop */ if (api != undefined) { api.destroy(); }
//简单的事件处理程序，响应自onChange,onSelect事件，按照上面的Jcrop调用 function showPreview(coords){ /* 设置剪切参数 */ $(\\”#x\\”).val(coords.x); $(\\”#y\\”).val(coords.y); $(\\”#w\\”).val(coords.w); $(\\”#h\\”).val(coords.h); if(parseInt(coords.w) > 0){ //计算预览区域图片缩放的比例，通过计算显示区域的宽度(与高度)与剪裁的宽度(与高度)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\\”, //预览图片宽度为计算比例值与原图片宽度的乘积 height:Math.round(rx * $(\\”#faceId\\”).height()) + \\”px\\”, //预览图片高度为计算比例值与原图片高度的乘积 marginLeft:\\”-\\” + Math.round(rx * coords.x) + \\”px\\”, marginTop:\\”-\\” + Math.round(ry * coords.y) + \\”px\\” }); } }
}
faceUpload.do\\” class=\\”form-horizontal\\” method=\\”post\\” enctype=\\”multipart/form-data\\”>
| 头像： |  static/img/1.jpg\\” class=\\”jcrop-preview\\” alt=\\”附件\\”> |
| 头像预览： | static/img/1.jpg\\” class=\\”jcrop-preview\\” alt=\\”预览\\” > |
| 用户名： | 艺名： |
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 = \\”/faceUpload.do\\”,method = RequestMethod.POST) public void faceLoginController(HttpServletRequest request,HttpServletResponse response,Model model, @RequestParam(\\”imgFile\\”) MultipartFile imgFile,String userName,String artName){
//剪裁图片坐标 String x = request.getParameter(\\”x\\”); String y = request.getParameter(\\”y\\”); String w = request.getParameter(\\”w\\”); String h = request.getParameter(\\”h\\”);
//原始图片坐标 String boundx = request.getParameter(\\”boundx\\”); String boundy = request.getParameter(\\”boundy\\”);
//切图参数 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);
//文件保存文件夹 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 { //处理头像附件 if(imgFile !=null) { //判断是否为图片文件 if(FileUploadCheck.allowUpload(imgFile.getContentType())) { boolean cut = CutImgeUtil.cutImge(imgFile.getInputStream(), imgeX, imgeY, imegW, imgeH, srcX, srcY, path+newName); if(cut) { //当头像剪切成功进行用户信息数据库存储 System.out.println(userName+\\” \\”+artName+\\” \\”+newName); }
} }
} catch (Exception e) { e.printStackTrace(); logger.error(\\”上传失败\\”); }
}}
工具类
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);
/** * 图片剪切工具类 * @param input 图片输入流 * @param x 截取时的x坐标 * @param y 截取时的y坐标 * @param desWidth 截取的宽度 * @param desHeight 截取的高度 * @param srcWidth 页面图片的宽度 * @param srcHeight 页面图片的高度 * @param newFilePath 保存路径+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 { //图片类 Image imge ; ImageFilter cropFilter;
//读取图片 BufferedImage bi = ImageIO.read(input);
//当剪裁大小小于原始图片大小才执行 if(srcWidth >= desWidth && srcHeight >= desHeight) { //获取原始图 Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT); //获取新图 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); // 输出文件 ImageIO.write(tag, \\”JPEG\\”, out); }
} catch (Exception e) { cutFlag = false; e.printStackTrace(); logger.error(\\”剪切失败\\”); } return cutFlag;
}}
package com.lovo.utils;
import java.util.Arrays;import java.util.List;
public class FileUploadCheck {
//支持的文件类型 public static final List ALLOW_TYPES = Arrays.asList(\\”image/jpg\\”,\\”image/jpeg\\”,\\”image/png\\”,\\”image/gif\\”);
//校验文件类型是否是被允许的 public static boolean allowUpload(String postfix){ return ALLOW_TYPES.contains(postfix); }}