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javaweb使用smartupload下载文件，和在线打开文件

2014-11-14 10:06 447 查看
使用smartupload下载文件，必须使用 smartupload.jar包，参考博客:/article/9081607.html

jsp页面：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>下载示例</title>
</head>

<body>

<a href="${pageContext.request.contextPath }/servlet/downloadServlet?name=background.jpg">word文档下载</a>     
<a href="${pageContext.request.contextPath }/servlet/onlineOpenServlet?id=wen.txt">在线打开</a>

</body>
</html>


downloadServlet：

package com.ning.servlet;

import java.io.File;
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 javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;

import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;

public class downloadServlet extends HttpServlet {

//文件下载功能
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//获取下载文件名
String fileName = request.getParameter("name");
System.out.println(fileName);

//新建一个smartUpload对象
SmartUpload smartUpload = new SmartUpload();
//初始化
smartUpload.initialize(this.getServletConfig(), request, response);
//设定contentDisposition为null以禁止浏览器自动打开文件
//保证单击链接后是下载文件。
smartUpload.setContentDisposition(null);
//下载文件
try {
smartUpload.downloadFile("/download/"+fileName);//使用相对路径进行下载
} catch (SmartUploadException e) {
e.printStackTrace();
}
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}


在线打开:downloadServlet:

package com.ning.servlet;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URL;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class onlineOpenServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String filename = request.getParameter("id");
System.out.println(filename);

//	String filePath = "/download/"+filename;
String filePath = "E:\\Workspaces\\MyEclipse 10\\.metadata\\.me_tcat\\webapps\\Ning\\download\\"+filename;
File file = new File(filePath);
if(!file.exists()){
response.sendError(404, "File not found!");
return;
}
BufferedInputStream br = new BufferedInputStream(new FileInputStream(file));
byte[] buf = new byte[1024];
int len = 0;

response.reset(); // 非常重要

//在线打开
URL u = new URL("file:///" + filePath);
response.setContentType(u.openConnection().getContentType());
response.setHeader("Content-Disposition", "inline; filename=" + file.getName());

//下载
/*        response.setContentType("application/x-msdownload");
response.setHeader("Content-Disposition", "attachment; filename=" + file.getName());*/

OutputStream out = response.getOutputStream();
while ((len = br.read(buf)) > 0)
out.write(buf, 0, len);
br.close();
out.close();
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
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