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jquery之ajaxfileupload异步上传插件

2024-04-27 15:11:57
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由于项目需求在上传头像是需要使用异步上传文件,在上传的过程中需要对文件进行校验:规则如下:宽度和高

度大于200,宽高比要小于2,大小小于2M。

    我这里使用的是AjaxFileUploader这个组件,服务器使用Struts处理文件。

    实例:

[html] view plain copy<form action="" id="imageForm" enctype="multipart/form-data" method="POST">      <input type="file" name="userPhoto" id="userPhoto">      <input type="button" value="上传" id="shangchuan">  </form>  

    这里需要引入两个js文件:jQuery、ajaxfileUpload

[html] view plain copy<script type="text/javascript" src="${basePath }/resource/js/plugin/jquery-1.6.min.js"></script>   <script type="text/Javascript" src="${basePath }/resource/js/grzx/ajaxfileupload.js"></script>  

   js文件:

[javascript] view plain copy//上传头像      $("#shangchuan").click(function(){          var file = $("#userPhoto").val();          if(file==""){              alert("请选择上传的头像");              return;          }          else{              //判断上传的文件的格式是否正确              var fileType = file.substring(file.lastIndexOf(".")+1);              if(fileType!="png"&&fileType!="jpg"){                  alert("上传文件格式错误");                  return;              }              else{                  var url = "/symh/user/uploadPhoto_uploadPhoto.action?nowtime="+new Date().getTime();                  $.ajaxFileUpload({                      url:url,                      secureuri:false,                      fileElementId:"userPhoto",        //file的id                          dataType:"text",                  //返回数据类型为文本                      success:function(data,status){                          if(data=="1"){                              alert("请上传宽度大于200像素和高度大于200像素的图片");                          }                          else if(data=="2"){                              alert("请上传宽高比不超过2的图片");                          }                          else if(data=="3"){                              alert("请上传文件大小不大于2M的图片");                          }                             else{                              $("#uploadImage").hide();                              $("#srcImg").attr("src",data);                              $("#PReviewImg").attr("src",data);                              $("#cutImage").show();                              $("#bigImage").val(data);                              cutImage();         //截取头像                          }                      }                  })              }          }      })  

    后台处理程序:UploadPhotoAction.Java

[html] view plain copypublic class UploadPhotoAction {      private File userPhoto;      private String userPhotoContentType;      private String userPhotoFileName;        public File getUserPhoto() {          return userPhoto;      }        public void setUserPhoto(File userPhoto) {          this.userPhoto = userPhoto;      }        public String getUserPhotoContentType() {          return userPhotoContentType;      }        public void setUserPhotoContentType(String userPhotoContentType) {          this.userPhotoContentType = userPhotoContentType;      }        public String getUserPhotoFileName() {          return userPhotoFileName;      }        public void setUserPhotoFileName(String userPhotoFileName) {          this.userPhotoFileName = userPhotoFileName;      }        /**       * 用户上传图像       */      public void uploadPhoto(){          try {              HttpServletResponse response = (HttpServletResponse) ActionContext.getContext().get(ServletActionContext.HTTP_RESPONSE);              response.setCharacterEncoding("UTF-8");                            FileInputStream fis1 = new FileInputStream(getUserPhoto());         //保存文件              FileInputStream fis2 = new FileInputStream(getUserPhoto());        //判断文件              int i = this.checkImage(fis2);              if(i==1){                  response.getWriter().print("1");              }              else if(i==2){                  response.getWriter().print("2");              }              else if(i==3){                  response.getWriter().print("3");              }              else {   //文件正确、上传                  //得到文件名                  String photoName = getPhotoName(getUserPhotoFileName());                                    FileOutputStream fos = new FileOutputStream(getSavePath()+"//"+photoName);                  byte[] buffer = new byte[1024];                    int len = 0;                    while ((len = fis1.read(buffer))>0) {                        fos.write(buffer,0,len);                       }                    //处理文件路径,便于在前台显示                  String imagPathString = dealPath(getSavePath()+"//"+photoName);                  response.getWriter().print(imagPathString);                                }          }           catch (IOException e) {              e.printStackTrace();          }            }            /**       * 重新命名头像名称:用户编号+头像后缀       */      public String getPhotoName(String photoName){          //获取用户          HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);          UserBean userBean = (UserBean) request.getsession().getAttribute("userBean");                    //获取文件的后缀          String[] strings = photoName.split("//.");          String hz = strings[1];                    //构建文件名          String fileName = userBean.getUserId()+"."+hz;          return fileName;      }            /**       * 获取上传路径       */      public String getSavePath(){          return ServletActionContext.getServletContext().getRealPath("upload/photos");      }            /**       * 判断上传的头像是否合法       * 规则:宽度和高度大于200、宽高比小于2、大小小于2M       * 宽度或者高度<200 返回1       * 宽高比>2 返回2       * 大小大于2M 返回 3       * 正确 返回 0       */      public int checkImage(FileInputStream fis){          try {              BufferedImage image = ImageIO.read(fis);              double width = image.getWidth();              double height = image.getHeight();              if(width<200||height<200){                  return 1;              }              else if(width/height>2){                  return 2;              }              else if(fis.available()/(1024*1024)>2){                  return 3;              }              else {                  return 0;              }          } catch (IOException e) {              e.printStackTrace();          }          return 1;      }            /**       * 处理头像路径       */      public String dealPath(String path){          String[] strings = path.split("////");          String string2 = "/";          for (int i = strings.length-4; i < strings.length; i++) {              if(i==strings.length-1){                  string2 = string2+strings[i];              }              else {                  string2 = string2+strings[i]+"/";              }                            }          return string2;      }  }  

    这里就介绍使用ajaxFileUpload异步上传文件。下面将介绍如何截取头像(类似于QQ上传头像)


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