单一文件上传：
一、前台 uploadFile.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 'uploadFile.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">
<meta http-equiv="ContentType" content="text/html;charset=UTF-8">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<form action="upload.action" method="post" enctype="multipart/form-data">
<input type="file" name="myfile" />
<input type="submit" name="upload" value="上传" />
</form>
</body>
</html>
二、后台 uploadFile.jsp
package com.zhaoran.controller;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
public class UploadServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
resp.setCharacterEncoding("UTF-8");
resp.setContentType("text/html;charset=UTF-8");
Part part=req.getPart("myfile");
String filename=getFileName(part);
writeTo(filename,part);
req.setAttribute("msg", "文件上传成功");
req.getRequestDispatcher("common/success.jsp").forward(req, resp);
}
private void writeTo(String filename, Part part) throws IOException {
InputStream inputStream=part.getInputStream();
OutputStream outputStream=new FileOutputStream("e://"+filename);
byte[] buff=new byte[1024];
int len=-1;
while((len=inputStream.read(buff))!=-1){
outputStream.write(buff, 0, len);
}
outputStream.close();
inputStream.close();
}
private String getFileName(Part part) {
//String header=part.getHeader("Content-Disposition");
String header=part.getHeader("Content-Disposition");
System.out.println(header);
String filename=header.substring(header.indexOf("filename="")+10,header.lastIndexOf("""));
System.out.println(filename);
return filename;
}
}
三、配置文件 web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>login</display-name>
<servlet>
<servlet-name>loginServlet</servlet-name>
<servlet-class>com.zhaoran.controller.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>loginServlet</servlet-name>
<url-pattern>/login.action</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>uploadServlet</servlet-name>
<multipart-config></multipart-config>
<servlet-class>com.zhaoran.controller.UploadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>uploadServlet</servlet-name>
<url-pattern>/upload.action</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
文件的批量上传：
一、前台页面
<%@ 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 'uploadFile.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">
<meta http-equiv="ContentType" content="text/html;charset=UTF-8">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<!-- 文件上传时，enctype需设置为multipart/form-data-->
<form action="upload.action" method="post" enctype="multipart/form-data">
<input type="file" name="myfile" />
<br />
<input type="submit" name="upload" value="上传" />
</form>
<hr />
<form action="upload2.action" method="post" enctype="multipart/form-data">
<input type="file" name="myfile" />
<br />
<input type="submit" name="upload" value="上传" />
</form>
<hr />
<form action="upload3.action" method="post" enctype="multipart/form-data">
文件一：<input type="file" name="myfile1" />
<br />
文件二：<input type="file" name="myfile2" />
<br />
文件三：<input type="file" name="myfile3" />
<br />
<input type="submit" name="upload" value="上传" />
</form>
</body>
</html>
二、后台servlet UploadServlet3.java
package com.zhaoran.controller;
import java.io.IOException;
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;
//采用注解方式配置servlet，文件上传中@MultipartConfig必不可少
@MultipartConfig(location="e://")
@WebServlet("/upload3.action")
public class UploadServlet3 extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
for(Part part:req.getParts()){
// System.out.println(part.getName());
if(part.getName().startsWith("myfile")){
String filename=getFileName(part);
// System.out.println(filename);
part.write(filename);
}
}
req.setAttribute("msg", "文件批量上传成功");
req.getRequestDispatcher("common/success.jsp").forward(req, resp);
return;
}
private String getFileName(Part part) {
String header=part.getHeader("Content-Disposition");//Content-Disposition
String filename=header.substring(header.indexOf("filename="")+10, header.lastIndexOf("""));
return filename;
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
}
三、采用注解方式，未使用配置文件web.xml