dwz+jquery+fileupload+springmvc实现文件上传 及图片预览
1 前台jsp:文件的上传利用了iframe实现局部刷新功能。使用了apache的fileupload组件，用到的jar: commons-fileupload.jar,commons-io.jar
DiskFileItemFactory fac = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(fac);
upload.setHeaderEncoding("utf-8");
JSP页面：
<%@ page contentType="text/html;charset=UTF-8" %><%@page import="com.pdcss.bmxxfb.model.*" %><%@ include file="/commons/taglibs.jsp" %><style>.perview {width:200px;background:#fff;font-size:12px; border-collapse:collapse;}.perview td, .perview th {padding:0px;border:0px;}.perview th {background-color:#f0f0f0; height:20px;}.perview a:link, .perview a:visited, .perview a:hover, .perview a:active {color:#00F;}.perview table{ width:100%;border:1px solid #ccc;border-collapse:collapse;}</style><script type="text/javascript" src="${ctx}/scripts/imgPreview/CJL.0.1.min.js"></script><script type="text/javascript" src="${ctx}/scripts/imgPreview/QuickUpload.js"></script><script type="text/javascript" src="${ctx}/scripts/imgPreview/ImagePreviewd.js"></script><script type="text/javascript"><!--//处理文件上传后的回调，如果成功，则关闭当前窗口，刷新indexfunction callback(flag,msg){if(flag=='true'){$("#pdtpNewForm").parent().parent().hide();navTab.reload('/bmxxfb/wzxxfbpdtp/manager');}else{alert(msg);}}//提交之前检查各字段function checkPdtpSubmit(){var zzdm = $("#pdtpNewForm #zzdm");if(zzdm.val().trim() ==""){alert("组织代码不能为空！"); zzdm.focus();return false;}var bmdm = $("#pdtpNewForm #bmdm");if(bmdm.val().trim() ==""){alert("组织代码不能为空！"); bmdm.focus();return false;}var tpbt = $("#pdtpNewForm #tpbt");if(tpbt.val().trim() ==""){alert("飘动主题不能为空！"); tpbt.focus();return false;}var tplj = $("#pdtpNewForm #tplj");if(tplj.val().trim() ==""){alert("链接地址不能为空！"); tplj.focus();return false;}var imgFile = $("#pdtpNewForm #imgFile");if(imgFile.val().trim() ==""){alert("图片不能为空"); imgFile.focus();return false;} var extStart=imgFile.val().lastIndexOf("."); var ext=imgFile.val().substring(extStart,imgFile.val().length).toLowerCase(); if(ext!=".bmp"&&ext!=".png"&&ext!=".gif"&&ext!=".jpg"&&ext!=".jpeg"){ alert("图片限于bmp,png,gif,jpeg,jpg格式"); imgFile.focus(); return false; } var regl=/^\+?[1-9][0-9]*$/; var kd = $("#pdtpNewForm #kd");if(!regl.test(kd.val())){alert("宽度应该为正整数！");kd.focus();return false;}if(parseInt(kd.val())>225){alert("宽度不能超过225！");kd.focus();return false;}var gd = $("#pdtpNewForm #gd");if(!regl.test(gd.val())){alert("宽度应该为正整数！");gd.focus();return false;}if(parseInt(gd.val())>200){alert("高度不能超过200！");gd.focus();return false;}return true;}function changeValue(flag){if(flag=='kd'){$("#pdtpNewForm #kd").val($("#kd_tem").val());}if(flag == 'gd'){$("#pdtpNewForm #gd").val($("#gd_tem").val());}}var ip = new ImagePreview( $$("imgFile"), $$("idImg"),{maxWidth: 225, maxHeight: 170, action: "viewImg.jsp"});ip.img.src = ImagePreview.TRANSPARENT;ip.file.onchange = function(){var imgFile = $("#pdtpNewForm #imgFile");if(imgFile.val().trim() ==""){alert("图片不能为空"); imgFile.focus();return false;} var extStart=imgFile.val().lastIndexOf("."); var ext=imgFile.val().substring(extStart,imgFile.val().length).toLowerCase(); if(ext!=".bmp"&&ext!=".png"&&ext!=".gif"&&ext!=".jpg"&&ext!=".jpeg"){ alert("图片限于bmp,png,gif,jpeg,jpg格式"); imgFile.focus(); return false; } ip.preview(); $("#idImg").attr("src","data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==");};$(document).ready(function(){$("#idImg").attr("src","data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==");});//--></script><form:form method="post" action="${ctx}/wzxxfbpdtp/save" target="hidden_frame" id="pdtpNewForm" enctype="multipart/form-data" modelAttribute="wzXxfbPdtp"><div layoutH="30"><div align="center" style="overflow: hidden;"><input type="hidden" id="pkid" name="pkid" value="${wzXxfbPdtp.pkid}"/><input type="hidden" name="imgPath" id="imgPath" /><input type="hidden" name="testH" value="testH"><table align="center" width="500px" height="300px" border="0" cellpadding="0" cellspacing="0" style="margin-top: 10px;text-align: center;border-spacing: 10px;"><tr><td align="right" width="70px"><%=WzXxfbPdtp.ALIAS_ZZDM%>:</td><td width="120px"><form:input path="zzdm" id="zzdm" size="25" readonly="true" value="${zzdm }" maxlength="50" /></td><td width="225px" rowspan="6"><table border="0" cellpadding="0" cellspacing="0"><tr><th bgcolor="#f0f0f0" style="line-height: 25px;"><center>预览图</center></th></tr><tr><td><div style="width: 225px;height: 170px;border:1px solid #99BBE8"><table border="0" id="bmdm" size="25" readonly="true" value="${bmdm }" maxlength="50" /></td></tr><tr><td width="70px"><label for="tpbt"><%=WzXxfbPdtp.ALIAS_TPBT%>:</label></td><td width="120px"><form:input path="tpbt" id="tpbt" size="25" cssmaxlength="100" /></td></tr><tr><td width="70px"><label for="tplj"><%=WzXxfbPdtp.ALIAS_TPLJ%>:</label></td><td width="120px"><form:input path="tplj" id="tplj" size="25" cssmaxlength="1000" /></td></tr><tr><td width="70px">图片宽高:</td><td width="120px"><table><tr><td><input id="kd_tem" name="kd_tem" value="160" onchange="javascript:changeValue('kd');" size="8" maxlength="4"><input type="hidden" id="kd" name="kd" value="160"></td><td> 单位(px)</td></tr></table></td></tr><tr><td width="70px"><label for="gd"><%=WzXxfbPdtp.ALIAS_GD%>:</label></td><td width="120px"><table><tr><td><input id="gd_tem" name="gd_tem" value="100" size="8" maxlength="4" onchange="javascript:changeValue('gd');"><input type="hidden" id="gd" name="gd" value="100"></td><td> 单位(px)</td></tr></table></td></tr><tr><td colspan="2" width="190px"><label for="sfpd"><%=WzXxfbPdtp.ALIAS_SFPD%>:</label><label><input type="radio" name="sfpd" value="1" checked="checked">飘动</label><label><input type="radio" name="sfpd" value="0">不飘动</label></td><td><font color="red">只允许上传1M内jpg,jpeg,gif,png格式图片</font></td></tr><tr><td width="70px">选择图片</td><td colspan="2"><input id="imgFile" name="imgFile" type="file" /></td></tr></table></div></div><iframe name="hidden_frame" id="hidden_frame" src="message.html" style="display:none"></iframe><div onclick="return checkPdtpSubmit();">保存</button></div></div></li><li><div name="code">import java.io.File;import java.io.PrintWriter;import java.io.UnsupportedEncodingException;import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Calendar;import java.util.Date;import java.util.Iterator;import java.util.List;import javacommon.base.BaseRestSpringController;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.validation.Valid;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.springframework.beans.propertyeditors.CustomDateEditor;import org.springframework.stereotype.Controller;import org.springframework.ui.ModelMap;import org.springframework.validation.BindingResult;import org.springframework.web.bind.WebDataBinder;import org.springframework.web.bind.annotation.InitBinder;import org.springframework.web.bind.annotation.ModelAttribute;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import cn.org.rapid_framework.page.Page;import cn.org.rapid_framework.web.scope.Flash;import com.common.consts.StaticDict;/** * @author pdcss * 这里是控制层,用于编写页面跳转控制,容器变量管理,JavaBean收集传递的代码 * 严禁出现 SQL,HQL,HTML,JS,CSS代码 * 可以将其他service层注入这里,但严禁将dao层注入这里 * */@Controller@RequestMapping("/wzxxfbpdtp")public class WzXxfbPdtpController extends BaseRestSpringController<WzXxfbPdtp,java.lang.String>{//默认多列排序,example: username desc,createTime ascprotected static final String DEFAULT_SORT_COLUMNS = ""; private WzXxfbPdtpManager wzXxfbPdtpManager;private final String LIST_ACTION = "redirect:/wzxxfbpdtp/manager";/** * 增加setXXXX()方法,spring就可以通过autowire自动设置对象属性,注意大小写 **/public void setWzXxfbPdtpManager(WzXxfbPdtpManager manager) {this.wzXxfbPdtpManager = manager;}/** binder用于bean属性的设置 */@InitBinder public void initBinder(WebDataBinder binder) { binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"), true)); } /** * 增加了@ModelAttribute的方法可以在本controller方法调用前执行,可以存放一些共享变量,如枚举值,或是一些初始化操作 */@ModelAttributepublic void init(ModelMap model) {model.put("now", new java.sql.Timestamp(System.currentTimeMillis()));/** * 读入静态字典 */StaticDict.fillMapAll(model);}/** * 初始化新增,修改,查询列表页面数据 * @param model */public void initAddAndUpdate(ModelMap model) {}/** 保存新增,@Valid标注spirng在绑定对象时自动为我们验证对象属性并存放errors在BindingResult */@SuppressWarnings("unchecked")@RequestMapping(value = "/save")public String create(ModelMap model,@Valid WzXxfbPdtp wzXxfbPdtp,HttpServletRequest request,HttpServletResponse response)throws Exception {DiskFileItemFactory fac = new DiskFileItemFactory();ServletFileUpload upload = new ServletFileUpload(fac);upload.setHeaderEncoding("utf-8");List fileList=null;try {fileList = upload.parseRequest(request);} catch (FileUploadException e1) {e1.printStackTrace();}//根路径String root=request.getSession().getServletContext().getRealPath("");//图片保存完整路径String savePath = root+File.separator+"pdtpFolder"+File.separator;File f1 = new File(savePath);if (!f1.exists()) {f1.mkdirs();}//图片名称String name = "";//新生成的图片名称String newName = "";//扩展名String extName = "";String message = "";boolean flag = true;Iterator<FileItem> it = fileList.iterator();while (it.hasNext()) {FileItem item = it.next();//给取表单域的值，赋给wzXxfbPdtp对象setFormFields(wzXxfbPdtp, item);// 如果是文件类型字段if (!item.isFormField()) {name = item.getName();long size = item.getSize();if(size>(1024*1024)){message="文件"+item.getName()+"大超过了1M，上传失败！";break;}// 扩展名格式：if (name.lastIndexOf(".") >= 0) {extName = name.substring(name.lastIndexOf("."));}// 定义允许上传的文件类型List<String> fileTypes = new ArrayList<String>();fileTypes.add(".jpg");fileTypes.add(".jpeg");fileTypes.add(".gif");fileTypes.add(".png");if(!fileTypes.contains(extName.toLowerCase())){message = "只允许上传jpg,jpeg,gif,png格式的图片";flag = false;}if(flag) {DateFormat df = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ssSSS");Calendar calendar = Calendar.getInstance();//以当前时间为文件名 格式如：2011-09-03-19-30-36047 newName = df.format(calendar.getTime());//name = UUID.randomUUID().toString();File newFile = new File(savePath + newName + extName);item.write(newFile);message="上传文件"+item.getName()+"成功";model.addAttribute("successFileName",newName + extName);//设置图片的相对地址wzXxfbPdtp.setTpdz("pdtpFolder/"+newName+extName);//图片原名称wzXxfbPdtp.setTpmc(name);} }}wzXxfbPdtpManager.save(wzXxfbPdtp);//dwzCallback(model,CREATED_SUCCESS);response.setContentType("text/html");response.setCharacterEncoding("utf-8");PrintWriter out = response.getWriter();out.write("<script>parent.callback('"+flag+"','"+message+"')</script>");//return LIST_ACTION;return null;}/** 保存更新,@Valid标注spirng在绑定对象时自动为我们验证对象属性并存放errors在BindingResult */@SuppressWarnings("unchecked")@RequestMapping(value="/{id}/update",method=RequestMethod.POST)public String update(ModelMap model,@PathVariable java.lang.String id,@Valid WzXxfbPdtp wzXxfbPdtp,BindingResult errors,HttpServletRequest request,HttpServletResponse response) throws Exception {DiskFileItemFactory fac = new DiskFileItemFactory();ServletFileUpload upload = new ServletFileUpload(fac);upload.setHeaderEncoding("utf-8");List fileList=null;try {fileList = upload.parseRequest(request);} catch (FileUploadException e1) {e1.printStackTrace();}String root=request.getSession().getServletContext().getRealPath("");String savePath = root+File.separator+"pdtpFolder"+File.separator;File f1 = new File(savePath);if (!f1.exists()) {f1.mkdirs();}String name = "";String newName = "";String extName = "";String message = "";//修改之前 图片地址String oldFilePath = "";boolean flag = true;wzXxfbPdtp.setPkid(id);Iterator<FileItem> it = fileList.iterator();while (it.hasNext()) {FileItem item = it.next();setFormFields(wzXxfbPdtp, item);if(item.isFormField()){String field = item.getFieldName();if(field.equals("oldFilePath")){oldFilePath = item.getString("utf-8");wzXxfbPdtp.setTpdz(oldFilePath);}if(field.equals("tpmc")){wzXxfbPdtp.setTpmc(item.getString("utf-8"));}}if (!item.isFormField()) {name = item.getName();if(name != null && !"".equals(name)){long size = item.getSize();if(size>(1024*1024)){message="文件"+item.getName()+"大超过了1M，上传失败！";break;}// 扩展名格式：if (name.lastIndexOf(".") >= 0) {extName = name.substring(name.lastIndexOf("."));}// 定义允许上传的文件类型List<String> fileTypes = new ArrayList<String>();fileTypes.add(".jpg");fileTypes.add(".jpeg");fileTypes.add(".gif");fileTypes.add(".png");if(!fileTypes.contains(extName.toLowerCase())){message = "只允许上传jpg,jpeg,gif,png格式的图片";flag = false;}if(flag) {DateFormat df = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ssSSS");Calendar calendar = Calendar.getInstance();//以当前时间为文件名 格式如：2011-09-03-19-30-36047 newName = df.format(calendar.getTime());//name = UUID.randomUUID().toString();File newFile = new File(savePath + newName + extName);item.write(newFile);message="上传文件"+item.getName()+"成功";model.addAttribute("successFileName",newName + extName);//设置图片的相对地址wzXxfbPdtp.setTpdz("pdtpFolder/"+newName+extName);//图片原名称wzXxfbPdtp.setTpmc(name);} }}}wzXxfbPdtpManager.update(wzXxfbPdtp);if(name != null && !"".equals(name) && flag == true){File oldImg = new File(root+File.separator+oldFilePath);if(oldImg.exists()){oldImg.delete();}}//dwzCallback(model,UPDATE_SUCCESS);response.setContentType("text/html");response.setCharacterEncoding("utf-8");PrintWriter out = response.getWriter();out.write("<script>parent.callbackEdit('"+flag+"','"+message+"')</script>");//return LIST_ACTION;return null;}/* * 因为前台Form表单的 enctype="multipart/form-data"，不能再通过request.getParameter()来取得参数，只能通过以下的方法：取得Form表单各文本域的值，赋给wzXxfbPdtp对象 */private void setFormFields(WzXxfbPdtp wzXxfbPdtp, FileItem item) throws UnsupportedEncodingException {if(item.isFormField()){String field = item.getFieldName();if(field.equals("zzdm")){String zzdm = item.getString("utf-8");wzXxfbPdtp.setZzdm(zzdm);}if(field.equals("bmdm")){String bmdm = item.getString("utf-8");wzXxfbPdtp.setBmdm(bmdm);}if(field.equals("tpbt")){String tpbt = item.getString("utf-8");wzXxfbPdtp.setTpbt(tpbt);}if(field.equals("tplj")){String tplj = item.getString("utf-8");wzXxfbPdtp.setTplj(tplj);}if(field.equals("kd")){String kd = item.getString("utf-8");wzXxfbPdtp.setKd(Integer.parseInt(kd));}if(field.equals("gd")){String gd = item.getString("utf-8");wzXxfbPdtp.setGd(Integer.parseInt(gd));}if(field.equals("sfpd")){String sfpd = item.getString("utf-8");wzXxfbPdtp.setSfpd(sfpd);}}}/** 删除 */@RequestMapping(value = "/{id}/delete")public String delete(ModelMap model,@PathVariable java.lang.String id,HttpServletRequest request) {WzXxfbPdtp pdtp = wzXxfbPdtpManager.getById(id);String path = pdtp.getTpdz();//得到图片存放的完整路径String folder = path.substring(0, path.lastIndexOf("/"));//得到图片的名称String name = path.substring(path.lastIndexOf("/")+1);//得到图片存放的完整路径String savePath = request.getSession().getServletContext().getRealPath("")+File.separator+folder+File.separator+name;wzXxfbPdtpManager.removeById(id);File f1 = new File(savePath);if(f1.exists()){f1.delete();}dwzCallback(model,DELETE_SUCCESS);return LIST_ACTION;}/** 批量删除 */@RequestMapping(value = "/batchDeletes")public String batchDelete(ModelMap model,@RequestParam("items") String items,HttpServletRequest request) {String[] arr_items = items.split(",");WzXxfbPdtp pdtp = null;for(int i = 0; i < arr_items.length; i++) {pdtp = wzXxfbPdtpManager.getById(arr_items[i]);wzXxfbPdtpManager.removeById(arr_items[i]);String path = pdtp.getTpdz();//得到图片存放的完整路径String folder = path.substring(0, path.lastIndexOf("/"));//得到图片的名称String name = path.substring(path.lastIndexOf("/")+1);//得到图片存放的完整路径String savePath = request.getSession().getServletContext().getRealPath("")+File.separator+folder+File.separator+name;File f1 = new File(savePath);if(f1.exists()){f1.delete();}}dwzCallback(model,DELETE_SUCCESS);return LIST_ACTION;}/** * DWZ 回调函数,封装了操作的结果 * * @param status */public void dwzCallback(ModelMap model,String status){if(CREATED_SUCCESS.equals(status) || UPDATE_SUCCESS.equals(status) || DELETE_SUCCESS.equals(status) ){Flash.current().success(status); //存放在Flash中的数据,在下一次http请求中仍然可以读取数据,error()用于显示错误消息/** * statusCode 200:成功 300:失败 301: */model.addAttribute("statusCode", "200");/** * 返回后需要刷新的 tab 的ID ,如不填写则不刷新 */model.addAttribute("navTabId", "BM01040000");/** * 返回后需要调用的 js 方法, closeCurrent: 关闭当前tab页(一般用于在tab页打开的新增,编辑页面) */if(! DELETE_SUCCESS.equals(status)){model.addAttribute("callbackType", "closeCurrent");}/** * 返回后提示栏显示的信息 */model.addAttribute("message", status);}}}图片预览需要用到的js:
CJL.0.1.min.js
ImagePreviewd.js
QuickUpload.js
3下面是实现图片预览的servlet
package com.common.controller;import java.awt.Color;import java.awt.Graphics2D;import java.awt.Image;import java.awt.geom.AffineTransform;import java.awt.image.AffineTransformOp;import java.awt.image.BufferedImage;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.Iterator;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import sun.misc.BASE64Encoder;import javax.imageio.*;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.apache.commons.io.output.DeferredFileOutputStream;import org.apache.log4j.Logger;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder;public class ImagePreview {private final static Logger LOGGER = Logger.getLogger(ImagePreview.class);public ImagePreview(){}public String ProcessRequest(HttpServletRequest request) throws ServletException, IOException{BASE64Encoder encoder = new BASE64Encoder();byte[] bs = null;long filesize = 0;DiskFileItemFactory factory = new DiskFileItemFactory();int width = 0;int height = 0;InputStream inputStream = null;ByteArrayOutputStream op = null;DeferredFileOutputStream dfo = null;try{factory.setSizeThreshold(4096);// 设置缓冲,这个值决定了是fileinputstream还是bytearrayinputstream//factory.setRepository(new File("d:\\temp"));//设置临时存放目录,默认是new File(System.getProperty("java.io.tmpdir"))ServletFileUpload sfileUpLoad = new ServletFileUpload(factory);sfileUpLoad.setSizeMax(1*1024*1024);//1MList items = sfileUpLoad.parseRequest(request);Iterator it = items.iterator();//暂时只考虑单文件while(it.hasNext()){FileItem fileItem = (FileItem)it.next();if(!fileItem.isFormField()){inputStream = fileItem.getInputStream();filesize = fileItem.getSize();bs = new byte[(int)filesize];}else{if (fileItem.getFieldName().equals("width")) {dfo = (DeferredFileOutputStream) fileItem.getOutputStream();width = Integer.parseInt(new String(dfo.getData()));}if (fileItem.getFieldName().equals("height")) {dfo = (DeferredFileOutputStream) fileItem.getOutputStream();height = Integer.parseInt(new String(dfo.getData()));}}}op = ResizeImg(inputStream, width, height);bs = op.toByteArray();String imgpath = "data:image/jpeg;base64," ;String img = encoder.encode(bs);imgpath += img;return imgpath;}catch (FileUploadException e) {e.printStackTrace();LOGGER.error(e);} catch (IOException e) {e.printStackTrace();LOGGER.error(e);}finally{if(dfo != null){dfo.close();}if(inputStream != null){inputStream.close();}if(op!= null){op.close();}}//blankimagereturn "data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==";}//只对jpg缩放public ByteArrayOutputStream ResizeImg(InputStream inputStream,int maxWidth,int maxHeight) throws IOException{BufferedImage bufferimage = ImageIO.read(inputStream);int curWidth = bufferimage.getWidth();int curHeight = bufferimage.getHeight();//double desiredRatio = Math.min((double)(maxWidth)/(double)curWidth,(double)maxHeight/(double)curHeight);//curWidth = (int) (curWidth*desiredRatio);//curHeight = (int)(curHeight*desiredRatio);double ratio = 0; Image itemp = bufferimage.getScaledInstance(maxWidth, maxHeight, bufferimage.SCALE_SMOOTH); // 计算比例 if ((bufferimage.getHeight() > maxHeight) || (bufferimage.getWidth() > maxWidth)) { if (bufferimage.getHeight() > bufferimage.getWidth()) { ratio = (new Integer(maxHeight)).doubleValue() / bufferimage.getHeight(); } else { ratio = (new Integer(maxWidth)).doubleValue() / bufferimage.getWidth(); } AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null); itemp = op.filter(bufferimage, null); } BufferedImage bufftmp = new BufferedImage(curWidth,curHeight,BufferedImage.TYPE_INT_RGB);Graphics2D g2D = bufftmp.createGraphics();g2D.setColor(Color.white);g2D.fillRect(0, 0, curWidth, curHeight);//g2D.drawImage(bufferimage, null, 0, 0);if (maxWidth == itemp.getWidth(null)) g2D.drawImage(itemp, 0, (maxHeight - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); else g2D.drawImage(itemp, (maxWidth - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); g2D.dispose(); // itemp = bufftmp;ByteArrayOutputStream op = new ByteArrayOutputStream();JPEGImageEncoder imageEncoder = JPEGCodec.createJPEGEncoder(op);imageEncoder.encode((BufferedImage)itemp);return op;}}viewImg.jsp:
<%@ page language="java" pageEncoding="UTF-8"%><%@page import="com.common.controller.ImagePreview;"%><%ImagePreview img = new ImagePreview();out.write(img.ProcessRequest(request));%>
下面是截图：
1 楼 logoc 2012-02-19 能给我发一下这个代码吗？谢谢，liliang_well@126.com 2 楼 zhanghj819 2012-07-26 能给我发一下这个代码吗？谢谢，184040434@QQ.com 3 楼 jieAmei 2012-09-19 能给我发一下这个代码吗？谢谢，452909926@qq.com