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front-end JSP:
<%@ page language="java" import="java.util.*" pageencoding="UTF-8"%>
<%
String path = Request.getcontextpath ();
String basepath = request.getscheme () + "://" +request.getservername () + ":" +request.getserverport () +path+ "/";
%>
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
<base href="<%=basePath%>">
<title>Ajax file uploads </title>
<script type="Text/javascript" src="Js/jquery-2.1.1.js"></script>
<script type="Text/javascript">
function Add () {
var formdata=New formdata ($ ("#frm") [0]);
$.ajax ({
Type: ' Post ',
URL: ' Ajaxupload.do ',
Data:formdata,
DataType: ' JSON ',
ContentType:false,
ProcessData:false,
Success:function(data) {
var result=data.result;
if (result== ' 1 ') {
Alert (' Submit success! ‘);
}Else{
Alert (' Submit failed! ‘);
}
},
Error:function() {
Alert (' Unknown error! ‘);
}
});
}
</script>
<body>
<form method="POST" id="frm" >
<table>
<tr><td> title : </td><td><input type="text" name="title" /> </td></tr>
<tr><td> content : </td><td><input type="text" name="content" /> </td></tr>
<tr><td> Annex I : </td><td><input type="file" name="FF" />< /td></tr>
<tr><td> Annex II : </td><td><input type="file" name="FF2" / ></td></tr>
<TR><TD colspan="2"><input type="button" onclick= "Add ()" Value="Submit"> </td></tr>
</table>
</form>
</body>
back-end servlet java code :
Package servlet;
Import Java.io.File;
Import java.io.IOException;
Import Java.io.PrintWriter;
Import java.util.List;
Import Java.util.UUID;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;
Import Org.apache.commons.fileupload.FileItem;
Import Org.apache.commons.fileupload.disk.DiskFileItemFactory;
Import Org.apache.commons.fileupload.servlet.ServletFileUpload;
Import Org.json.JSONObject;
public class Ajaxuploadservlet extends HttpServlet {
public void doget (HttpServletRequest request, httpservletresponse response)
Throws Servletexception, IOException {
This.dopost (request, response);
}
public void DoPost (HttpServletRequest request, httpservletresponse response)
Throws Servletexception, IOException {
Response.setcontenttype ("text/html");
PrintWriter out = Response.getwriter ();
Diskfileitemfactory factory=new diskfileitemfactory ();
Servletfileupload upload=new servletfileupload (Factory);
Jsonobject js=new jsonobject ();
String title= "";
String content= "";
try {
List<fileitem> items=upload.parserequest (Request);
for (Fileitem Item:items) {
if (Item.isformfield ()) {
only in this form can get the value of the normal form field , upload the file, form form of the enctype= "Multipart/form-data", is to submit data in binary data stream. Therefore, you cannot use Request.getparameter ("name") to get the normal form field values that are submitted to the background.
if ("title". Equals (Item.getfieldname ())) {
Title=item.getstring ("UTF-8");
}else if ("Content". Equals (Item.getfieldname ())) {
Content=item.getstring ("UTF-8");
}
}else{
String Filename=item.getname ();
System.out.println (" uploaded file :" +filename);
String Path=request.getrealpath ("/upload");
File F=new file (path+ "/" +uuid.randomuuid () + "-" +filename);
Item.write (f);
Js.put ("Result", "1");
}
}
System.out.println ("title:" +title+ ", Content:" +content);
} catch (Exception e) {
E.printstacktrace ();
}
Out.write (Js.tostring ());
}
}
Ajax+formdata Asynchronous File Upload
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