spring mvc+localResizeIMG实现HTML5端图片压缩上传

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

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 + "]"; 
 } 
 
}