html:
图片上传：
js:
function changepic(){
var reads = new FileReader();
f = document.getElementById('file').files[0];
reads.readAsDataURL(f);
reads.onload = function(e) {
document.getElementById('img').src = this.result;
$("#img").css("display", "block");
$("#dialogBg").show();
$(".loading").show();
var form = new FormData(); // 可以增加表单数据
// 存入文件对象
form.append("file",f);
$.ajax({
//几个参数需要注意一下
type: "POST",//方法类型
dataType: "json",//预期服务器返回的数据类型
url: "action/servlet" ,//url
enctype: "multipart/form-data",
data: form,
processData: false,
contentType : false,
success: function (result) {
...
},
error : function() {
alert("异常！");
}
});
};
}
servlet:
String filePath = getServletContext().getRealPath("/") + "upload";
HttpSession session = request.getSession();
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
if (ServletFileUpload.isMultipartContent(request)) {
try {
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload sfu = new ServletFileUpload(factory);
sfu.setSizeMax(10 * 1024 * 1024);
sfu.setHeaderEncoding("utf-8");
@SuppressWarnings("unchecked")
ListfileItemList = sfu.parseRequest(request);
IteratorfileItems = fileItemList.iterator();
while (fileItems.hasNext()) {
FileItem fileItem = fileItems.next();
if (!fileItem.isFormField()) {
String fileName = fileItem.getName();
String suffix = fileName.substring(fileName.lastIndexOf('.'));
File file = new File(filePath);
if(!file.exists() && !file.isDirectory()){
file.mkdir();
}
File targetFile = new File(file, "check" + suffix);
fileItem.write(targetFile);
fileItem.delete();
}
}
} catch (FileUploadException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
