JCrop+ajaxUpload 图像切割上传的实例代码

(编辑：jimmy 日期: 2024/11/20 浏览：3 次 )
先给大家展示下效果图：
页面代码
里面用户的uuid是写死的test
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE>
<html lang="en">
<head>
<title>用户头像剪裁</title>
<meta http-equiv="Content-type" content="text/html;charset=UTF-8" />
<link rel="stylesheet" href="resources/Jcrop/css/jquery.Jcrop.css">
<link rel="stylesheet" href="resources/css/photo.css">
<script src="/UploadFiles/2021-04-02/jquery.min.js">

后台代码


@ResponseBody
@RequestMapping("uploadphoto")
public Map<String, Object> uploadPhoto(@RequestParam("upimage") MultipartFile imageFile, HttpServletRequest request,
HttpServletResponse response) throws Exception {
Map<String, Object> result = new HashMap<String, Object>();
boolean tag =false;
String unid = request.getParameter("unid");
String x = request.getParameter("x");
String y = request.getParameter("y");
String h = request.getParameter("h");
String w = request.getParameter("w");
// 页面实际图片宽高
String pheight = request.getParameter("ph");
String pweight = request.getParameter("pw");
// 切图参数
int imageX = Integer.parseInt(x);
int imageY = Integer.parseInt(y);
int imageH = Integer.parseInt(h);
int imageW = Integer.parseInt(w);
int srcH = Integer.parseInt(pheight);
int srcW = Integer.parseInt(pweight);
String realPath = request.getSession().getServletContext().getRealPath("/");
String resourcePath = "resources/uploadImages/";
try {
if (imageFile != null) {
if (FileUploadUtil.allowUpload(imageFile.getContentType())) {
// 这里开始截取操作
byte[] b = ImageCut.imgCut(imageFile.getInputStream(), imageX, imageY, imageW, imageH, srcW, srcH);
if (b != null) {
// 存入数据库
User user = userService.selectByPrimaryKey(unid);
user.setPhoto(b);
tag = (userService.updateByPrimaryKeySelective(user)==1)"result", tag);
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
result.put("result", tag);
return result;
}


图像切割工具类


package com.ssm.demo.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.InputStream;
import javax.imageio.ImageIO;
public class ImageCut {
/**
* 截取图片
* 
* @param srcImageFile
* 原图片地址
* @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
* 
*/
public static byte[] imgCut(InputStream input, int x, int y, int desWidth, int desHeight, int srcWidth,
int srcHeight) {
try {
Image img;
ImageFilter cropFilter;
BufferedImage bi = ImageIO.read(input);
if (srcWidth >= desWidth && srcHeight >= desHeight) {
Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
cropFilter = new CropImageFilter(x, y, desWidth, desHeight);
img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));
BufferedImage tag = new BufferedImage(desWidth, desHeight, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img, 0, 0, null);
g.dispose();
// 输出文件
ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write(tag, "JPEG", out);
return out.toByteArray();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}


以上所述是小编给大家介绍的JCrop+ajaxUpload 图像切割上传的实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！
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