java实现粘贴图片上传

jsp页面

 <!--  创建一个div粘贴图片 --><div class="form-group">        <label class="col-md-1 control-label" for="textarea-input">            图标：</label>        <div id="pasteShapeIcon" contenteditable="true"            style="width: 400px; height: 300px; border: dashed; margin: 3% 9.2% -0.5%">在此框中粘贴图片        </div>    </div><script>    //点击div框中内容清除    $("#pasteShapeIcon").click(function(){                 $("#pasteShapeIcon").empty();    });//粘贴图片    //var pasteShapeIcon=document.getElementById("pasteShapeIcon");    var pasteShapeIcon=$("#pasteShapeIcon")[0];    pasteShapeIcon.addEventListener("paste", function(event){        var clipboardData = event.clipboardData;        var file, reader;        Array.prototype.forEach.call(clipboardData.types, function(type, i){            var item = clipboardData.items[i];            var imageType = /image\/(png|jpg|webp|gif|bmp)/i;            //console.log(type, item.type, 'type');            if(type.match(imageType) || item.type.match(imageType)){                file = item.getAsFile();                reader = new FileReader();                reader.onload = function(evt){                    /* console.log('result: ', evt, evt.target, evt.target.result); */                    var image = new Image();                    image.src = evt.target.result;                           $.ajax({                           //将图片url传到controller进行处理                                           url : "${ctx}/admin/handgesture/uploadShapeIcon.json",                            type : "post",                            cache : false,                            dataType:"text",                             /* async:false ajax按顺序执行fangfa */                              async:false,                             data :{'shapeIconPaste':image.src,                                   'code':$("#code").val()                                },                            success : function(url) {                            //将返回的图片存储地址赋在页面input中，随form表单传到后台保存                                 $("#shapeIconPaste").val(url);                                 }                            });                                             pasteShapeIcon.appendChild(image);                };                reader.readAsDataURL(file);            }        });    }, false);  

//controller
工具类

package com.shiro.entity;import java.io.File;import java.io.FileOutputStream;import java.io.OutputStream;import org.apache.commons.lang.StringUtils;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.web.context.request.RequestContextHolder;import org.springframework.web.context.request.ServletRequestAttributes;import sun.misc.BASE64Decoder;public class FileUploadUtil {    public static String UPLOAD_DIR="upload";    public static final String BASE_DIR=((ServletRequestAttributes)RequestContextHolder.getRequestAttributes())            .getRequest().getSession().getServletContext().getRealPath("/")+UPLOAD_DIR;    public static final String RL_DIR=((ServletRequestAttributes)RequestContextHolder.getRequestAttributes())            .getRequest().getContextPath();    public static final String UPLOAD_PIC_FILE_DIR = BASE_DIR + File.separator+"backpic";    public static final String UPLOAD_APP_FILE_DIR = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest().getSession().getServletContext().getRealPath("/")+"app";     public static final String UPLOAD_USER_FILE_DIR = BASE_DIR + File.separator+"hand";    public static final String UPLOAD_ADS_FILE_DIR = BASE_DIR + File.separator+"sysads";    public static final String UPLOAD_EXCEL_FILE_DIR = BASE_DIR + File.separator+"excel";    public static final String UPLOAD_OTA_FILE_DIR = BASE_DIR + File.separator+"ota";    public static Log log = LogFactory.getLog(FileUploadUtil.class);     //base64字符串转化成图片      public static String GenerateImage(String imgStr,String absolutePath,String code)      {               File dirs = new File(absolutePath);        dirs.mkdirs();        //截取图片后缀名        String extName=imgStr.substring(11, 14);        String fileName=code+"_"+System.currentTimeMillis()+"."+extName;          //对字节数组字符串进行Base64解码并生成图片          if (imgStr == null) //图像数据为空              return null;          BASE64Decoder decoder = new BASE64Decoder();        //得到的base64 字符串为截掉,之前的内容        String[] imgurl=imgStr.split(",");        try           {  File saveFile = new File(absolutePath,fileName);        if(!saveFile.exists()){            saveFile.createNewFile();        }            //Base64解码              byte[] b = decoder.decodeBuffer(imgurl[1]);               //生成jpeg图片             // String imgFilePath = saveFile.getPath();//新生成的图片              OutputStream out = new FileOutputStream(saveFile);                  out.write(b);              out.flush();              out.close();              log.info("Upload success :"+saveFile.getAbsolutePath());            String dl=File.separator+UPLOAD_DIR+absolutePath.split(UPLOAD_DIR)[1];            return joinPath(new String[]{dl,fileName});         }           catch (Exception e)           {               e.printStackTrace();          }        return null;      }      public static String joinPath(String[] subPaths){        return StringUtils.join(subPaths,File.separator);    }}

controller ajax处理的base64 url,返回存储的图片地址

    @ResponseBody    @RequestMapping(value = "/uploadShapeIcon.json")    public String uploadShapeIcon(HttpServletResponse response, @RequestParam String shapeIconPaste, @RequestParam String code,Model model,HttpServletRequest request){        String url="";        response.setCharacterEncoding("UTF-8");          try {              //获取粘贴板图片              String absolutePath = FileUploadUtil.joinPath(new String[] { FileUploadUtil.UPLOAD_USER_FILE_DIR});             url=FileUploadUtil.GenerateImage(shapeIconPaste, absolutePath, code);               } catch (Exception e) {              // TODO Auto-generated catch block              e.printStackTrace();          }          return url;         }