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index.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">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript"
src="https://www.idaobin.com/js/jquery-3.2.1.js"></script>
<script type="text/javascript"
src="https://www.idaobin.com/test/ajaxfileupload.js"></script>
<script type="text/javascript">
function ajaxFileUpload() {
$.ajaxFileUpload(
{
url : '/testweb/upload', //用于文件上传的服务器端请求地址
secureuri : false, //一般设置为false
fileElementId : 'file', //文件上传空间的id属性 <input type="file" id="file" name="file" />
dataType : 'text', //返回值类型 一般设置为json
success : function(data, status) //服务器成功响应处理函数
{
//方法一，用后台返回值
alert(data); //后台out输出的值
},
error : function(data, status, e) //服务器响应失败处理函数
{
//方法一，用后台返回值
alert(data); //后台out输出的值
}
}
)
return false;
}
</script>
</head>
<body>
This is my JSP page.
<br>
<div id="btn">click</div>
<input type="file" id="file" name="file" />
<br />
<input type="button" value="上传" onclick="return ajaxFileUpload();">
<br>
<p><span id="myspan"></span></p>
</body>
</html>
servlet：
package test;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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;
/**
* Servlet implementation class upload
*/
@WebServlet("/upload")
public class upload extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final String UPLOAD_DIRECTORY = "upload";
// 上传配置
private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB
private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
/**
* @see HttpServlet#HttpServlet()
*/
public upload() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
//PrintWriter writer = response.getWriter();
// 检测是否为多媒体上传
if (!ServletFileUpload.isMultipartContent(request)) {
// 如果不是则停止
response.getWriter().print("上传失败！");
response.getWriter().flush();
//writer.println("上传失败！");
//writer.flush();
return;
}
// 配置上传参数
DiskFileItemFactory factory = new DiskFileItemFactory();
// 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
factory.setSizeThreshold(MEMORY_THRESHOLD);
// 设置临时存储目录
factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
ServletFileUpload upload = new ServletFileUpload(factory);
// 设置最大文件上传值
upload.setFileSizeMax(MAX_FILE_SIZE);
// 设置最大请求值 (包含文件和表单数据)
upload.setSizeMax(MAX_REQUEST_SIZE);
// 构造临时路径来存储上传的文件
// 这个路径相对当前应用的目录
String uploadPath = request.getContextPath() + File.separator + UPLOAD_DIRECTORY;
//获取项目发布路径 下的upload文件夹
uploadPath = request.getSession().getServletContext().getRealPath("/upload");
// 如果目录不存在则创建
File uploadDir = new File(uploadPath);
if (!uploadDir.exists()) {
uploadDir.mkdir();
}
try {
// 解析请求的内容提取文件数据
List<FileItem> formItems = upload.parseRequest(request);
if (formItems != null && formItems.size() > 0) {
// 迭代表单数据
for (FileItem item : formItems) {
// 处理不在表单中的字段
if (!item.isFormField()) {
System.out.println(item.getName());
String fileName = new File(item.getName()).getName();
String filePath = uploadPath + File.separator + getDate() +"-" + fileName.replace(" ", "");
String suffix = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase(); //后缀名 ，没有.
File storeFile = new File(filePath);
// 在控制台输出文件的上传路径
System.out.println(filePath);
System.out.println(suffix);
// 保存文件到硬盘
item.write(storeFile);
//writer.println("上传成功！");
response.getWriter().print("上传成功！");
}
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
/**
* 日期-文件名
* @return
*/
private String getDate() {
SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
String dt=df.format(new Date());
return dt;
}
}
原文链接：https://www.idaobin.com/archives/2068.html
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