本文实例为大家分享了JavaWeb实现裁剪图片上传完整案例，供大家参考，具体内容如下
实现思路
•使用jcrop插件手机要裁剪图片的坐标
•将收集到的参数传递到后台，在后台使用java图形对象绘制图像进行裁剪
◦后台处理流程：
1、将上传的图片按按照比例进行压缩后上传到文件服务器，并且将压缩后的图片保存在本地临时目录中。
2、将压缩后的图片回显到页面，使用jcrop进行裁剪，手机裁剪坐标（x,y,width,height）
■@paramx 目标切片起点坐标X
■@param y 目标切片起点坐标Y
■@param width 目标切片宽度
■@param height 目标切片高度
3、后台处理裁剪裁剪，重新上传
jsp页面
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@ page contentType="text/html;charset=UTF-8" language="java" %><!doctype html><html><head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"/> <title>上传用户头像</title> <link href="${pageContext.request.contextPath}/js/cutImg/css/master.css" rel="stylesheet" /> <link href="${pageContext.request.contextPath}/js/cutImg/css/upload.css" rel="stylesheet" /> <link href="${pageContext.request.contextPath}/js/cutImg/css/jquery.rollbar.css" rel="stylesheet" /> <link href="${pageContext.request.contextPath}/js/cutImg/css/jquery.Jcrop.css" rel="stylesheet" /></head><body><div> <form id="uploadImgFrom" enctype="multipart/form-data" method="post"> <div> <div> <div> <div id="pic2" > <div id="uploadFile"> <div style="margin-left: 75px;"> <a href="javascript:;" id="upText" style="color:red;">上传头像</a> </div> <p> 支持jpg、png格式<br /> 图片小于2M </p> </div> <!--回显示图片--> <img src="" name="photo" id="originalImg"/> </div> </div> <p id="up_reload" style="display: none;"> <a href="javascript:;" style="color: red">重新上传</a> </p> <input type="hidden" name="picval" id="picval" /> <input type="hidden" name="origpicval" id="origpicval" value="" /> <input type="hidden" name="temporigpic" id="temporigpic" /> <input type="hidden" name="fileID" id="fileID" size="100" /> <input type="hidden" name="fileUrl" id="fileUrl" size="100" /> <input type="hidden" name="imgHeight" id="imgHeight" size="100" /> <input type="hidden" name="imgWidth" id="imgWidth" size="100" /> </div> <div> <div> <img id="preview_1" src="${pageContext.request.contextPath}/images/4-3.jpg"/> </div> <p> 400 x 300像素 </p> <%--<div> <img id="preview_2" src=${pageContext.request.contextPath}/images/4-3.jpg /> </div> <p> 80 x 80像素 </p>--%> <p> 拖拽或缩放，生成自己满意的头像 </p> </div> <%-- <div id="img_description"> <textarea </div>--%> <div> <font id="upalert"></font> </div> </div> <input type="hidden" name="x" id="x" size="5" /> <input type="hidden" name="y" id="y" size="5" /> <input type="hidden" name="w" id="w" size="5" /> <input type="hidden" name="h" id="h" size="5" /> <input type="hidden" name="imgUrl" id="imgUrl"/> <input type="hidden" name="imgId" id="imgId"/> <div> <div id="saveImage"> <a href="javascript:;" style="color: red">保存头像</a> </div> </div> </form></div></body><script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery.form.js"></script><script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery.validate.min.js"></script><script type="text/javascript" src="${pageContext.request.contextPath}/js/check.js"></script><script src="${pageContext.request.contextPath}/js/cutImg/js/jquery-1.7.1.min.js" type="text/javascript"></script><script src="${pageContext.request.contextPath}/js/cutImg/js/jquery.form.js" type="text/javascript"></script><script src="${pageContext.request.contextPath}/js/cutImg/js/jquery-custom-file-input.js" type="text/javascript"></script><script src="${pageContext.request.contextPath}/js/cutImg/js/jquery.Jcrop.js" type="text/javascript"></script><script src="${pageContext.request.contextPath}/js/cutImg/js/jquery.rollbar.min.js" type="text/javascript"></script><script src="${pageContext.request.contextPath}/js/cutImg/js/upload.ui.photos.js" type="text/javascript"></script><script type="text/javascript" src="${pageContext.request.contextPath}/js/dialog/dialog.js?lib=false"></script><script type="text/javascript"> photos.JcorpWidth = 400;//裁剪选择框宽度 photos.JcorpHeight = 300;//裁剪框选择高度// photos.Widths = ["200", "80"];// 图片大小“宽”数组，根据图片张数由大到小定义不同图片的宽度// photos.Heights = ["200", "80"];// 图片大小“高”数组，根据图片张数由大到小定义不同图片的高度 photos.UpLoad_FileID = "uploadFile";//上传组件属性ID photos.UpLoad_FileTextID = "upText";//上传组件按钮文本ID photos.UpLoad_AlertID = "upalert";//提示文本ID photos.UpLoad_AlertClassName = "error";//提示文本增加的样式 photos.Upload_FormID = "uploadImgFrom";//上传组件表单ID photos.UpLoad_OriginFileID = "originalImg";//底图图片ID photos.UpLoad_ReLoadID = "up_reload";//重新上传组件ID photos.UpLoad_PicValueID = "picval";//上传的底图片内容ID photos.UpLoad_PicFileID = "fileID";////上传图片id photos.UpLoad_PicFileUrl = "fileUrl";////上传图片url photos.UpLoad_PicImgHeight="imgHeight";//上传的底图高 photos.UpLoad_PicImgWidth="imgWidth";//上传的底图宽 photos.UpLoad_TempOriginValueID = "temporigpic";//本页面重新上传时的原图片内容ID photos.UpLoad_OriginValueID = "origpicval";//其他页面进入时的原图片内容ID photos.Upload_RollbarID = "pic2";//自定义滚动条ID photos.UpLoad_SaveID = "saveImage";//图片保存按钮ID photos.UpLoad_PreviewPreFix = "preview_";//多个不同尺寸小图的ID前缀名称，多个小图ID格式“前缀”+数字编号（从1开始），例：id="photos_preview1" ... photos.ParentFileImgID = "imgUrl";//父级图片控件ID photos.ParentFileValueID = "imgId";//父级图片地址控件ID photos.XID = "x";//x photos.YID = "y";//y photos.WID = "w";//w photos.HID = "h";//h photos.UpText_Format = "抱歉，暂只支持 jpg、png、bmp 格式";//图片格式验证文本 /* photos.UpText_Size = "抱歉，图片大小不能超过2M";*///图片大小验证文本 /*photos.UpText_Error = "图片上传出错";//上传出错文本*/ photos.Url_Check = "/Enterprise/filescheck";//文件验证大小的地址 photos.Url_UpLoad = "/Enterprise/uploadphoto?up=original";//上传图片载入底图的地址 photos.Url_ReLoad = "";//重新上传的地址 photos.Url_Save = "/Enterprise/saveimg?up=save";//保存图片的地址</script></html>后台java代码
图片上传工具类
package com.shengya.service.utils;import com.shengya.service.ImgContants;import org.apache.commons.fileupload.disk.DiskFileItem;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.multipart.commons.CommonsMultipartFile;import sun.misc.BASE64Encoder;import javax.crypto.Mac;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;import javax.imageio.ImageIO;import javax.imageio.ImageReadParam;import java.awt.*;import java.awt.geom.AffineTransform;import java.awt.image.AffineTransformOp;import java.awt.image.BufferedImage;import java.io.*;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLEncoder;import java.util.ArrayList;/** * @author Darcy * Created by Administrator on 2016/6/17. */public class UploadUtils { // public final static String RADIOURL = "http://211.102.216.237:8011/fileServer/webapi/Attachments/bio?"; public final static String RADIOURL = "http://192.168.1.15:8088/fileServer/webapi/Attachments/bio?"; public final static String URL = ImgContants.IMG_UPLOAD + "/file/UpLoadImage?"; public final static String FILEURL = ImgContants.IMG_UPLOAD + "/file/UpLoadFile?"; public final static String VEDIOURL = ImgContants.FILE_UPLOAD + "/file/UpLoadFile?"; public final static String CROPURL = ImgContants.IMG_UPLOAD + "/file/CropImage?"; private static byte[] readAsByteArr(InputStream is) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); try { byte[] bytes = new byte[1024]; int length = 0; while ((length = is.read(bytes)) != -1) { baos.write(bytes, 0, length); } return baos.toByteArray(); } catch (Exception e) { e.printStackTrace(); } finally { try { baos.close(); } catch (IOException e) { e.printStackTrace(); } } return null; } /** * 上传图片 * * @param file */ public static String submitImage(File file) throws UnsupportedEncodingException { String fileName = URLEncoder.encode(file.getName(), "UTF-8"); long fileSize = file.length(); boolean isReSuffix = true; int height = 0; int width = 500; String mark = "t"; String mode = "W"; String url = sign(URL) + "&ChannelNo=muying_android" + "&FileName=" + fileName + "&FileSize=" + fileSize + "&IsReSuffix=" + isReSuffix + "&Height=" + height + "&Width=" + width + "&Mark=" + mark + "&Mode=" + mode; System.out.println("url:" + url); HttpURLConnection conn = null; OutputStream outStream = null; BufferedInputStream bin = null; try { bin = new BufferedInputStream(new FileInputStream(file)); conn = (HttpURLConnection) new URL(url) .openConnection(); conn.setConnectTimeout(15000); conn.setRequestMethod("POST"); conn.setDoOutput(true); // conn.setFixedLengthStreamingMode(file.length()); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("Content-Length", file.length() + ""); // conn.setRequestProperty("Range", "bytes="+""); // 设置 HttpURLConnection的字符编码 conn.setRequestProperty("Accept-Charset", "UTF-8"); outStream = conn.getOutputStream(); byte[] buf = new byte[1024]; int len = 0; int lenCount = 0; while ((len = bin.read(buf)) != -1) { outStream.write(buf, 0, len);//OK lenCount = lenCount + len; } outStream.flush(); int responseCode = conn.getResponseCode(); if (responseCode == 200) { InputStream inStream = conn.getInputStream(); byte[] data1 = readAsByteArr(inStream); String json = new String(data1); inStream.close(); return json; } else { InputStream inStream = conn.getInputStream(); byte[] data1 = readAsByteArr(inStream); String json = new String(data1); inStream.close(); return json; } } catch (Exception e) { e.printStackTrace(); } finally { try { if (outStream != null) { outStream.close(); } } catch (IOException e) { e.printStackTrace(); } } return null; } /** * 上传图片 * * @param file */ public static String submitWebImage(MultipartFile file) throws UnsupportedEncodingException { String fileName = URLEncoder.encode(file.getOriginalFilename(), "UTF-8"); long fileSize = file.getSize(); boolean isReSuffix = true; int height = 0; int width = 500; String mark = "t"; String mode = "W"; String url = sign(URL) + "&ChannelNo=muying_android" + "&FileName=" + fileName + "&FileSize=" + fileSize + "&IsReSuffix=" + isReSuffix + "&Height=" + height + "&Width=" + width + "&Mark=" + mark + "&Mode=" + mode; System.out.println("url:" + url); HttpURLConnection conn = null; OutputStream outStream = null; BufferedInputStream bin = null; try { bin = new BufferedInputStream(file.getInputStream()); conn = (HttpURLConnection) new URL(url) .openConnection(); conn.setConnectTimeout(15000); conn.setRequestMethod("POST"); conn.setDoOutput(true); // conn.setFixedLengthStreamingMode(file.length()); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("Content-Length", file.getSize() + ""); // conn.setRequestProperty("Range", "bytes="+""); // 设置 HttpURLConnection的字符编码 conn.setRequestProperty("Accept-Charset", "UTF-8"); outStream = conn.getOutputStream(); byte[] buf = new byte[1024]; int len = 0; int lenCount = 0; while ((len = bin.read(buf)) != -1) { outStream.write(buf, 0, len);//OK lenCount = lenCount + len; } outStream.flush(); int responseCode = conn.getResponseCode(); if (responseCode == 200) { InputStream inStream = conn.getInputStream(); byte[] data1 = readAsByteArr(inStream); String json = new String(data1); inStream.close(); return json; } else { InputStream inStream = conn.getInputStream(); byte[] data1 = readAsByteArr(inStream); String json = new String(data1); inStream.close(); return json; } } catch (Exception e) { e.printStackTrace(); } finally { try { if (outStream != null) { outStream.close(); } } catch (IOException e) { e.printStackTrace(); } } return null; } /** * 上传视频 * * @param file */ public static String submitRadio(MultipartFile file) throws Exception { String url = signRadio(RADIOURL); System.out.println("url:" + url); HttpURLConnection conn = null; OutputStream outStream = null; BufferedInputStream bin = null; try { bin = new BufferedInputStream(file.getInputStream()); conn = (HttpURLConnection) new URL(url) .openConnection(); conn.setConnectTimeout(15000); conn.setRequestMethod("POST"); conn.setDoOutput(true); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("Content-Length", file.getSize() + ""); conn.setRequestProperty("Accept-Charset", "UTF-8"); outStream = conn.getOutputStream(); byte[] buf = new byte[1024]; int len = 0; int lenCount = 0; while ((len = bin.read(buf)) != -1) { outStream.write(buf, 0, len);//OK lenCount = lenCount + len; } outStream.flush(); int responseCode = conn.getResponseCode(); if (responseCode == 200) { InputStream inStream = conn.getInputStream(); byte[] data1 = readAsByteArr(inStream); String json = new String(data1); inStream.close(); return json; } else { InputStream inStream = conn.getInputStream(); byte[] data1 = readAsByteArr(inStream); String json = new String(data1); inStream.close(); return json; } } catch (Exception e) { e.printStackTrace(); } finally { try { if (outStream != null) { outStream.close(); } } catch (IOException e) { e.printStackTrace(); } } return null; } /** * 上传简历快照 * * @param fileName * @param content * @return * @throws UnsupportedEncodingException */ public static String submitFile(String fileName, String content) throws UnsupportedEncodingException { //content = URLEncoder.encode(content, "UTF-8"); fileName = URLEncoder.encode(fileName, "UTF-8"); byte[] contentBytes = content.getBytes(); long fileSize = contentBytes.length; boolean isReSuffix = true; int height = 0; int width = 500; String mark = "t"; String mode = "W"; String url = sign(FILEURL) + "&ChannelNo=muying_android" + "&FileName=" + fileName + "&FileSize=" + fileSize + "&IsReSuffix=" + isReSuffix + "&Height=" + height + "&Width=" + width + "&Mark=" + mark + "&Mode=" + mode; System.out.println("url:" + url); HttpURLConnection conn = null; OutputStream outStream = null; BufferedInputStream bin = null; try { conn = (HttpURLConnection) new URL(url) .openConnection(); conn.setConnectTimeout(15000); conn.setRequestMethod("POST"); conn.setDoOutput(true); // conn.setFixedLengthStreamingMode(file.length()); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("Content-Length", content.length() + ""); // conn.setRequestProperty("Range", "bytes="+""); // 设置 HttpURLConnection的字符编码 conn.setRequestProperty("Accept-Charset", "UTF-8"); outStream = conn.getOutputStream(); outStream.write(contentBytes, 0, contentBytes.length);//OK outStream.flush(); int responseCode = conn.getResponseCode(); if (responseCode == 200) { InputStream inStream = conn.getInputStream(); byte[] data1 = readAsByteArr(inStream); String json = new String(data1); inStream.close(); return json; } else { InputStream inStream = conn.getInputStream(); byte[] data1 = readAsByteArr(inStream); String json = new String(data1); inStream.close(); return json; } } catch (Exception e) { e.printStackTrace(); } finally { try { if (outStream != null) { outStream.close(); } } catch (IOException e) { e.printStackTrace(); } } return null; } /** * 上传附件 * * @return json 字符串 * @throws UnsupportedEncodingException */ public static String submitFile(MultipartFile file) throws UnsupportedEncodingException { String fileName = URLEncoder.encode(file.getOriginalFilename(), "UTF-8"); long fileSize = file.getSize(); boolean isReSuffix = true; int height = 0; int width = 500; String mark = "t"; String mode = "W"; String url = sign(FILEURL) + "&ChannelNo=muying_android" + "&FileName=" + fileName + "&FileSize=" + fileSize + "&IsReSuffix=" + isReSuffix + "&Height=" + height + "&Width=" + width + "&Mark=" + mark + "&Mode=" + mode; System.out.println("url:" + url); HttpURLConnection conn = null; OutputStream outStream = null; BufferedInputStream bin = null; try { bin = new BufferedInputStream(file.getInputStream()); conn = (HttpURLConnection) new URL(url) .openConnection(); conn.setConnectTimeout(15000); conn.setRequestMethod("POST"); conn.setDoOutput(true); // conn.setFixedLengthStreamingMode(file.length()); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("Content-Length", file.getSize() + ""); // conn.setRequestProperty("Range", "bytes="+""); // 设置 HttpURLConnection的字符编码 conn.setRequestProperty("Accept-Charset", "UTF-8"); outStream = conn.getOutputStream(); byte[] buf = new byte[1024]; int len = 0; int lenCount = 0; while ((len = bin.read(buf)) != -1) { outStream.write(buf, 0, len);//OK lenCount = lenCount + len; } int responseCode = conn.getResponseCode(); if (responseCode == 200) { InputStream inStream = conn.getInputStream(); byte[] data1 = readAsByteArr(inStream); String json = new String(data1); inStream.close(); return json; } else { InputStream inStream = conn.getInputStream(); byte[] data1 = readAsByteArr(inStream); String json = new String(data1); inStream.close(); return json; } } catch (Exception e) { e.printStackTrace(); } finally { try { if (outStream != null) { outStream.close(); } } catch (IOException e) { e.printStackTrace(); } } return null; } private static String sign(String baseurl) throws UnsupportedEncodingException { long currebttime = System.currentTimeMillis(); long timeStamp = currebttime / 1000; String data = "ActionName=UpLoadImage" + "&SecretKey=4b19f08dbf0adb82ce9cc7c207ec1dc9" + "&TimeStamp=" + timeStamp; String signature = hmac_sha1("4b19f08dbf0adb82ce9cc7c207ec1dc9", URLEncoder.encode(data, "UTF-8")); signature = signature.replace("%3D", "%3d"); signature = signature.replace("%3A", "%3a"); signature = signature.replace("%2F", "%2f"); return baseurl + data + "&Signature=" + signature; } private static String signRadio(String url) throws Exception { long currebttime = System.currentTimeMillis(); String data = "secretKey=f1b79c865c424be46183a2f0a49a0f15" + "&timeStamp=" + currebttime; System.out.println("url:" + url + data); System.out.println("url = " + URLEncoder.encode(url + data, "utf-8")); String signature = HmacSha1Util.getSignature(URLEncoder.encode(url + data, "utf-8"), "f1b79c865c424be46183a2f0a49a0f15"); return url + data + "&signature=" + signature; } private static String hmac_sha1(String key, String datas) { String reString = ""; try { datas = datas.replace("%3A", "%3a"); datas = datas.replace("%2F", "%2f"); datas = datas.replace("%3D", "%3d"); byte[] data = key.getBytes("UTF-8"); // 根据给定的字节数组构造一个密钥,第二参数指定一个密钥算法的名称 SecretKey secretKey = new SecretKeySpec(data, "HmacSHA1"); // 生成一个指定 Mac 算法 的 Mac 对象 Mac mac = Mac.getInstance("HmacSHA1"); // 用给定密钥初始化 Mac 对象 mac.init(secretKey); byte[] text = datas.getBytes("UTF-8"); // 完成 Mac 操作 byte[] text1 = mac.doFinal(text); reString = new BASE64Encoder().encodeBuffer(text1); reString = URLEncoder.encode(reString, "UTF-8"); reString = reString.replace("%0A", ""); reString = reString.replace("%0D", ""); } catch (Exception e) { e.printStackTrace(); } return reString; } /** * 上传裁剪图片 * zxiao 2016/09/01 * * @param fileID */ public static String submitCutedWebImage(MultipartFile file,String fileID,String x,String y,String w,String h) throws UnsupportedEncodingException { String FileId=fileID; String[] CropWidths=new String[]{"50"};//裁剪宽度 //List<String> list=new List<String>(); //List<String> list = new ArrayList<String>(5); ArrayList<String> listCropWidths = new ArrayList<String>(); listCropWidths.add("400");// String[] CropHeights=new String[]{"50"};//裁剪高度 ArrayList<String> listCropHeights = new ArrayList<String>(); listCropHeights.add("300"); int CropX=Integer.parseInt(x);//裁剪x坐标 int CropY=Integer.parseInt(y);//裁剪y坐标// String[] CropFixs=new String[]{"l"};//裁剪图片的标示集合 ArrayList<String> listCropFixs = new ArrayList<String>(); listCropFixs.add("l"); String SourceSuffix="jpg";//底图后缀 String SourceFix="";//底图标示 /* boolean isReSuffix = true; int height = 1000; int width = 750; String mark = "t"; String mode = "W";*/ String url = sign(CROPURL) + "FileId=" + fileID + "&CropWidths=" + listCropWidths + "&CropHeights=" + listCropHeights + "&CropX=" + CropX + "&CropY=" + CropY + "&CropFixs=" + listCropFixs + "&SourceSuffix=" + SourceSuffix+ "&SourceFix=" + SourceFix; System.out.println("url:" + url); HttpURLConnection conn = null; OutputStream outStream = null; BufferedInputStream bin = null; try { bin = new BufferedInputStream(file.getInputStream()); conn = (HttpURLConnection) new URL(url) .openConnection(); conn.setConnectTimeout(15000); conn.setRequestMethod("POST"); conn.setDoOutput(true); // conn.setFixedLengthStreamingMode(file.length()); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("Content-Length", file.getSize() + ""); // conn.setRequestProperty("Range", "bytes="+""); // 设置 HttpURLConnection的字符编码 conn.setRequestProperty("Accept-Charset", "UTF-8"); outStream = conn.getOutputStream(); byte[] buf = new byte[1024]; int len = 0; int lenCount = 0; while ((len = bin.read(buf)) != -1) { outStream.write(buf, 0, len);//OK lenCount = lenCount + len; } int responseCode = conn.getResponseCode(); if (responseCode == 200) { InputStream inStream = conn.getInputStream(); byte[] data1 = readAsByteArr(inStream); String json = new String(data1); inStream.close(); return json; } else { InputStream inStream = conn.getInputStream(); byte[] data1 = readAsByteArr(inStream); String json = new String(data1); inStream.close(); return json; } } catch (Exception e) { e.printStackTrace(); } finally { try { if (outStream != null) { outStream.close(); } } catch (IOException e) { e.printStackTrace(); } } return null; } /**上传裁剪后图片 需在本地保存副本 *zxiao 2016/09/01 * @param ， * @param x * @param y * @param w * @param h * @return * @throws IOException */ public static String submitCropImage(MultipartFile file,Integer x,Integer y,Integer w,Integer h) throws IOException { String folder=System.getProperty("java.io.tmpdir"); File tempDir =new File(folder); //如果文件夹不存在则创建 if (!tempDir .exists() && !tempDir .isDirectory()) {// System.out.println("//不存在"); tempDir .mkdir(); } //压缩后临时文件 String Srcpath=folder+"scaleTemp.jpg"; //获取文件的后缀 /*File uploadFile = new File(Srcpath); InputStream inputStream = file.getInputStream(); FileInputStream fs= (FileInputStream) inputStream; String srcImg = URLEncoder.encode(file.getOriginalFilename(), "UTF-8"); String suffix=srcImg.substring(srcImg.lastIndexOf(".")+1);*/ //裁剪图片 cutImgUtils o = new cutImgUtils(x,y,w,h); o.setSrcpath(Srcpath); o.setSubpath(folder+"uptemp.jpg"); File tempFile = o.cut("jpg"); String s = submitImage(tempFile); return s; } /** * 获取上传图片的宽 * zxiao 2016/09/09 * @param file * @return */ public static int getImgWidth(MultipartFile file) throws IOException { InputStream is = null; BufferedImage src = null; int ret = -1; try { is = file.getInputStream(); src = javax.imageio.ImageIO.read(is); ret = src.getWidth(null); // 得到源图宽 is.close(); } catch (Exception e) { e.printStackTrace(); } return ret; } /** * 获取上传图片的高 * zxiao 2016/09/09 * @param file * @return */ public static int getImgHeight(MultipartFile file) { InputStream is = null; BufferedImage src = null; int ret = -1; try { is = file.getInputStream(); src = javax.imageio.ImageIO.read(is); ret = src.getHeight(null); // 得到源图高 is.close(); } catch (Exception e) { e.printStackTrace(); } return ret; } /** * 缩放图像（按高度和宽度缩放） * @param file 文件对象 * @param result 缩放后的图像地址 * @param height 缩放后的高度 * @param width 缩放后的宽度 * @param bb 比例不对时是否需要补白：true为补白; false为不补白; */ public static void scale(MultipartFile file, String result, int height, int width, boolean bb) { try { double ratio = 0.0; // 缩放比例 /*CommonsMultipartFile cf= (CommonsMultipartFile)file; DiskFileItem fi = (DiskFileItem)cf.getFileItem(); File f = fi.getStoreLocation();*/// File f = new File(srcImageFile); InputStream inputStream = file.getInputStream(); BufferedImage bi = ImageIO.read(inputStream); Image itemp = bi.getScaledInstance(width, height, bi.SCALE_SMOOTH); // 计算比例 if ((bi.getHeight() > height) || (bi.getWidth() > width)) { if (bi.getHeight() > bi.getWidth()) { ratio = (new Integer(height)).doubleValue() / bi.getHeight(); } else { ratio = (new Integer(width)).doubleValue() / bi.getWidth(); } AffineTransformOp op = new AffineTransformOp(AffineTransform .getScaleInstance(ratio, ratio), null); itemp = op.filter(bi, null); } if (bb) {//补白 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.setColor(Color.white); g.fillRect(0, 0, width, height); if (width == itemp.getWidth(null)) g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); else g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); g.dispose(); itemp = image; } ImageIO.write((BufferedImage) itemp, "jpg", new File(result)); } catch (IOException e) { e.printStackTrace(); } } public static void main(String[] args) { try { /* File file = new File("E://bole//doc//服务接口文档//伯乐服务接口说明v1.0.docx"); System.out.println("file = " + file); String json = submitFile(file); System.out.println("json = " + json);*/ } catch (Exception e) { e.printStackTrace(); } }}图片裁剪工具类
package com.shengya.service.utils;import javax.imageio.ImageIO;import javax.imageio.ImageReadParam;import javax.imageio.ImageReader;import javax.imageio.stream.ImageInputStream;import java.awt.*;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.util.Iterator;/** * Created by Administrator on 2016/9/1. */public class cutImgUtils { // ===源图片路径名称如：c:/1.jpg private String srcpath; // ===剪切图片存放路径名称。如：c:/2.jpg private String subpath; public void setSrcpath(String srcpath) { this.srcpath = srcpath; } public void setSubpath(String subpath) { this.subpath = subpath; } // ===剪切点x坐标 private int x; private int y; // ===剪切点宽度 private int width; private int height; public cutImgUtils() { } public cutImgUtils(int x, int y, int width, int height) { if(x<0){ x=0; }else{ this.x = x; } if(y<0){ y=0; }else{ this.y = y; } this.width = width; this.height = height; } /** * * 对图片裁剪，并把裁剪完蛋新图片保存 。 */ public File cut() throws IOException { FileInputStream is = null; ImageInputStream iis = null; try { // 读取图片文件 is = new FileInputStream(srcpath); /** * * 返回包含所有当前已注册 ImageReader 的 Iterator，这些 ImageReader * * 声称能够解码指定格式。 参数：formatName - 包含非正式格式名称 . * * (例如 "jpeg" 或 "tiff")等 。 */ Iterator<ImageReader> it = ImageIO .getImageReadersByFormatName("jpg"); ImageReader reader = it.next(); // 获取图片流 iis = ImageIO.createImageInputStream(is); /** * * <p> * iis:读取源。true:只向前搜索 * </p> * .将它标记为 ‘只向前搜索'。 * * 此设置意味着包含在输入源中的图像将只按顺序读取，可能允许 reader * * 避免缓存包含与以前已经读取的图像关联的数据的那些输入部分。 */ reader.setInput(iis, true); /** * * <p> * 描述如何对流进行解码的类 * <p> * .用于指定如何在输入时从 Java Image I/O * * 框架的上下文中的流转换一幅图像或一组图像。用于特定图像格式的插件 * * 将从其 ImageReader 实现的 getDefaultReadParam 方法中返回 * * ImageReadParam 的实例。 */ ImageReadParam param = reader.getDefaultReadParam(); /** * * 图片裁剪区域。Rectangle 指定了坐标空间中的一个区域，通过 Rectangle 对象 * * 的左上顶点的坐标(x，y)、宽度和高度可以定义这个区域。 */ Rectangle rect = new Rectangle(x, y, width, height); // 提供一个 BufferedImage，将其用作解码像素数据的目标。 param.setSourceRegion(rect); /** * * 使用所提供的 ImageReadParam 读取通过索引 imageIndex 指定的对象，并将 * * 它作为一个完整的 BufferedImage 返回。 */ BufferedImage bi = reader.read(0, param); // 保存新图片 ImageIO.write(bi, "jpg", new File(subpath)); File file = new File("subpath"); return file; } finally { if (is != null) is.close(); if (iis != null) iis.close(); } } public File cut(String suffix) throws IOException { FileInputStream is = null; ImageInputStream iis = null; try { // 读取图片文件 is = new FileInputStream(srcpath);// is = inputStream; /** * * 返回包含所有当前已注册 ImageReader 的 Iterator，这些 ImageReader * * 声称能够解码指定格式。 参数：formatName - 包含非正式格式名称 . * * (例如 "jpeg" 或 "tiff")等 。 * Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName("jpg"); */ String suffixName=null; if(suffix.equals("gif")){ suffixName="gif"; }else if(suffix.equals("png")){ suffixName="png"; } else{ suffixName="jpg"; } Iterator<ImageReader> it = ImageIO .getImageReadersByFormatName(suffixName); ImageReader reader = it.next(); // 获取图片流 iis = ImageIO.createImageInputStream(is); /** * * <p> * iis:读取源。true:只向前搜索 * </p> * .将它标记为 ‘只向前搜索'。 * * 此设置意味着包含在输入源中的图像将只按顺序读取，可能允许 reader * * 避免缓存包含与以前已经读取的图像关联的数据的那些输入部分。 */ reader.setInput(iis, true); /** * * <p> * 描述如何对流进行解码的类 * <p> * .用于指定如何在输入时从 Java Image I/O * * 框架的上下文中的流转换一幅图像或一组图像。用于特定图像格式的插件 * * 将从其 ImageReader 实现的 getDefaultReadParam 方法中返回 * * ImageReadParam 的实例。 */ ImageReadParam param = reader.getDefaultReadParam(); /** * * 图片裁剪区域。Rectangle 指定了坐标空间中的一个区域，通过 Rectangle 对象 * * 的左上顶点的坐标(x，y)、宽度和高度可以定义这个区域。 */ Rectangle rect = new Rectangle(x, y, width, height); // 提供一个 BufferedImage，将其用作解码像素数据的目标。 param.setSourceRegion(rect); /** * * 使用所提供的 ImageReadParam 读取通过索引 imageIndex 指定的对象，并将 * * 它作为一个完整的 BufferedImage 返回。 */ BufferedImage bi = reader.read(0, param); // 保存新图片 ImageIO.write(bi, "jpg", new File(subpath)); File file = new File(subpath); return file; } finally { if (is != null) is.close(); if (iis != null) iis.close(); } }}遇到的问题总结：
-裁剪图片发生偏移现象
解决办法：使用压缩后的图片等比例收集裁切坐标信息
-MultipartFile 和 File之间相互转化
第一种方法：
MultipartFile file = xxx; CommonsMultipartFile cf= (CommonsMultipartFile)file; DiskFileItem fi = (DiskFileItem)cf.getFileItem(); File f = fi.getStoreLocation();
会在项目的根目录的临时文件夹下生成一个文件；
第二种方法：
transferTo(File dest)；
会在项目中生成一个新文件；
第三种方法：
File f = (File) xxx 强转即可。前提是要配置multipartResolver，要不然会报类型转换失败的异常。
<bean id="multipartResolver"> <property name="maxUploadSize" value="104857600"/> <property name="maxInMemorySize" value="4096"/> </bean>
没试过；
第四种方法：
Workbook wb = Workbook.getWorkbook(xxx .getInputStream());
转换为输入流，直接读取；
第五种方法：
byte[] buffer = myfile.getBytes();
先转换为字节数组，没试过；
第六种方法：
直接转成输入流
MultipartFile file=xxx; is = file.getInputStream(); src = javax.imageio.ImageIO.read(is); ret = src.getWidth(null); // 得到源图宽
参考资料：
jcop api：http://code.ciaoca.com/jquery/jcrop/.
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持武林网。