servlet类代码
下载：
package com.oracle.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;
public class DownloadServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String filename = request.getParameter("filename");
SmartUpload su = new SmartUpload();
//初始化
su.initialize(getServletConfig(),request,response);
try {
su.downloadFile("/img/"+filename);
} catch (SmartUploadException e) {
e.printStackTrace();
}
}
}
上传：
package com.oracle.servlet;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;
public class UploadServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//设置文件保存位置
String path = getServletContext().getRealPath("/")+"img";
File file = new File(path);
if(!file.exists()){
file.mkdir();
}
//实例化SmartUpload对象
SmartUpload su = new SmartUpload();
//初始化
su.initialize(getServletConfig(),request,response);
//设置上传文件大小
su.setMaxFileSize(1024*1024*10);
//设置上传的文件格式
su.setAllowedFilesList("jpg,png,jpeg,gif,exe,doc,txt,docx");
String mess = "上传成功";
List<String> list = new ArrayList<String>();
try {
su.upload();
//获取上传文件对象
for (int i = 0; i < su.getFiles().getCount(); i++) {
com.jspsmart.upload.File f = su.getFiles().getFile(i);
String filename = System.currentTimeMillis()+"."+f.getFileExt();//生成文件
f.saveAs(path+"/"+filename);
list.add(filename);
}
//保存文件
// su.save(path);
} catch (SmartUploadException e) {
if(e.getMessage().contains("1010")){
mess = "上传失败：文件类型不支持";
}
}
request.setAttribute("mess", mess);
request.setAttribute("list", list);
request.getRequestDispatcher("index.jsp").forward(request, response);
}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name></display-name>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>SmartUploadServlet</servlet-name>
<servlet-class>com.oracle.servlet.SmartUploadServlet</servlet-class>
</servlet>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>UploadServlet</servlet-name>
<servlet-class>com.oracle.servlet.UploadServlet</servlet-class>
</servlet>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>DownloadServlet</servlet-name>
<servlet-class>com.oracle.servlet.DownloadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>SmartUploadServlet</servlet-name>
<url-pattern>/SmartUploadServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>UploadServlet</servlet-name>
<url-pattern>/UploadServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>DownloadServlet</servlet-name>
<url-pattern>/DownloadServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
jsp代码:
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
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">
-->
</head>
<body>
<form action="UploadServlet" method="post" enctype="multipart/form-data">
上传：<input type="file" name="myfile1"><br>
上传：<input type="file" name="myfile2"><br>
上传：<input type="file" name="myfile3"><br>
上传：<input type="file" name="myfile4"><br>
<input type="submit">${mess }
</form>
<c:if test="${list.size()>0 }">
<c:forEach items="${list }" var="img">
<img src="<%=basePath%>img/${img }" width="300px">
<a href="DownloadServlet?filename=${img }">点击下载</a>
<hr>
</c:forEach>
</c:if>
</body>
</html>
要导的包
