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JSP 使用smartupload上传文件，JSP+servlet

2017-06-01 14:05 483 查看

首先创建一个用来给用户提交的jsp页面，使用表单方式对文件进行上传。

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>上传</title>
</head>
<body>
<form action="../UploadServlet" method="post" enctype="multipart/form-data">
<input type="text" name="desc">
<input type="file" name="file" >
<input type="submit" value="上传">

</form>
</body>
</html>

要注意，form表单一定要设置enctype属性为“mulipart/form-data”

enctype

中文意思：编码方式

然后创建一个UploadServlet用来处理文件。

package com.hu.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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 com.jspsmart.upload.File;
import com.jspsmart.upload.Request;
import com.jspsmart.upload.SmartUpload;

/**
* Servlet implementation class UploadServlet
*/
@WebServlet("/UploadServlet")
public class UploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public UploadServlet() {
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 {
response.setCharacterEncoding("utf-8");
PrintWriter out=response.getWriter();

SmartUpload mySmartUpload=new SmartUpload();
int count=0;//上传文件的数量
try {

mySmartUpload.initialize(this.getServletConfig(),request,response);
//限制每个上传文件的最大长度
mySmartUpload.setMaxFileSize(50*1024*1024);
//设置允许上传的文件格式
mySmartUpload.setAllowedFilesList("doc,txt");
mySmartUpload.upload();
//获得上传的文件
File myflie=mySmartUpload.getFiles().getFile(0);
//获得上传文件的名字
String fileName=myflie.getFileName();

//保存文件的目录
count=mySmartUpload.save("D://UPLOAD");
//获取文件的描述信息
Request req=mySmartUpload.getRequest();
String descrption=req.getParameter("desc");
out.println(count+"files uploaded<br>");
out.println("file descrption:"+descrption);

} catch (Exception e) {
out.print("Unable to upload file");
out.println(e.toString());
}
}

}

这里需要说明一下，使用SmartUpload需要加载驱动，驱动文件可以去CSDN下载，搜索jspsmartupload.jar。下载好驱动后，放在web-inf文件下的lib文件中，右键点击驱动，选择add to…（这一步可以省略）

上传的文件最好不要放在工程中，可以放在其他磁盘中。

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标签： servlet jsp smartuploa

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