这篇文章主要为大家展示了“jquery中ajaxfileupload异步上传插件怎么用”,内容简而易懂,条理清晰,希望能够帮助大家解决疑惑,下面让小编带领大家一起研究并学习一下“jquery中ajaxfileupload异步上传插件怎么用”这篇文章吧。
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:
<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
<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:
//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
public 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;
}
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();
}
}
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;
}
public String getSavePath(){
return ServletActionContext.getServletContext().getRealPath("upload/photos");
}
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;
}
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;
}
}
以上是“jquery中ajaxfileupload异步上传插件怎么用”这篇文章的所有内容,感谢各位的阅读!相信大家都有了一定的了解,希望分享的内容对大家有所帮助,如果还想学习更多知识,欢迎关注编程网行业资讯频道!