使用spring mvc+localResizeIMG实现HTML5端图片压缩上传的功能

<span style="white-space:pre">    </span><script src="<c:url value="/js/JQuery/jquery-1.10.0.min.js"/>"></script>  <span style="white-space:pre">    </span><script type="text/javascript" src="<c:url value="/js/lrz/dist/lrz.bundle.js"/>"></script>  

 <input  type="file"  id="payfile" name="myfile" style="display:none;" onchange="fileChange(this)" />

function fileChange(that){          var filepath=$(that).val();          if(filepath=="")          {              return;          }          var extStart=filepath.lastIndexOf(".");          var ext=filepath.substring(extStart,filepath.length).toUpperCase();          if(".jpg|.png|.bmp|.jpeg".toUpperCase().indexOf(ext.toUpperCase())==-1){             alert("只允许上传jpg、png、bmp、jpeg格式的图片");              return false;          }       //以图片宽度为800进行压缩      lrz(that.files[0], {           width: 800         })      .then(function (rst) {              //压缩后异步上传              $.ajax({              url : "<%=request.getContextPath()%>/common/fileUploadPicture",              type: "POST",              data : {                  imgdata:rst.base64//压缩后的base值              },              dataType:"json",              cache:false,              async:false,              success : function(data) {              if(data.success)                  {                      alert(data.message);///data.message为上传成功后的文件路径                  }else{                      alert(data.message);///data.message为上传失败原因                  }                                                        },          error : function(){                  alert("上传失败");                          }                      });           });  }  

import sun.misc.BASE64Decoder;//导入的base64的类  /**      * 文件上传      */      @ResponseBody      @RequestMapping("common/fileUploadPicture")      public Object fileUploadPicture(String imgdata, HttpServletRequest request) {          LOGGER.info("[文件上传（fileUploadPicture）][params:imgdata=" + imgdata + "]");           BASE64Decoder decoder = new BASE64Decoder();          try {              String basePath = request.getRealPath("/upload_files");              string imgPath=basePath+"/test.jpg";              // new一个文件对象用来保存图片，默认保存当前工程根目录              File imageFile = new File(imgPath);              // 创建输出流              FileOutputStream outputStream = new FileOutputStream(imageFile);              // 获得一个图片文件流，我这里是从flex中传过来的              byte[] result = decoder.decodeBuffer(imgdata.split(",")[1]);//解码              for (int i = 0; i < result.length; ++i) {                  if (result[i] < 0) {// 调整异常数据                  result[i] += 256;              }          }              outputStream.write(result);                return new Result(true, imgPath);          } catch (AppException e1) {              LOGGER.error("[文件上传（fileUpload）-fastdfs][errors:" + e1 + "]");              return new Result(false, "文件上传失败");          } catch (Exception e) {              LOGGER.error("[文件上传（fileUpload）][errors:" + e + "]");              return new Result(false, "文件上传失败");          }finally{          outputStream.flush();           outputStream.close();                    }      }  

import java.io.Serializable;    public class Result implements Serializable{      private static final long serialVersionUID = 1L;      private boolean success;      private String message;        public Result() {          success = true;      }        public Result(boolean success, String message) {          this.success = success;          this.message = message;      }        public boolean isSuccess() {          return success;      }        public void setSuccess(boolean success) {          this.success = success;      }        public String getMessage() {          return message;      }        public void setMessage(String message) {          this.message = message;      }        @Override      public String toString() {          return "Result [success=" + success + ", message=" + message + "]";      }    }