Servlet 通過表單上傳檔案和獲取表單資料的最簡單方式
阿新 • • 發佈:2019-02-04
注意:本文所描述的方法需要Servlet 3.0 及以上版本的支援。
一、伺服器端Servlet程式碼:
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
import java.io.IOException;
@WebServlet(name = "UploadTestServlet",urlPatterns = {"/upload"})
//下面的註解中location的值為上傳的檔案的臨時存放位置
@MultipartConfig(location = "D://uploadtest")
public class UploadTestServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println(request.getParameter("uploaderName"));
Part part=request.getPart("file"); //通過表單中的name屬性獲取表單域中的檔案
part.write("D://uploadtest//aaa.txt"); //將檔案移動到特定的磁碟路徑
String fname=part.getSubmittedFileName();
System.out.println("檔名:" +fname);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
二、瀏覽器端HTML程式碼
版本1、普通表單提交
<html>
<head>
<title>上傳頁</title>
</head>
<body>
<form id="uploadForm" enctype="multipart/form-data" method="post" action="/upload">
<input id="file" type="file" name="file"/>
<input name="uploaderName" type="text"/>
<input type="submit" value="提交"/>
</form>
</body>
</html>
版本2、AJAX非同步提交表單
<html>
<head>
<script type="application/javascript" src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<title>Title</title>
</head>
<body>
<form id="uploadForm" enctype="multipart/form-data" method="post" action="/upload">
<input id="file" type="file" name="file"/>
<input name="uploaderName" type="text"/>
<button id="upload" value="提交" type="button" onclick="fun();">upload</button>
</form>
<script type="application/javascript">
function fun() {
$.ajax({
url: '/upload',
type: 'POST',
cache: false,
data: new FormData($('#uploadForm')[0]),
processData: false,
contentType: false
}).done(function(res) {
}).fail(function(res) {});
}
</script>
</body>
</html>