JAVA上传与下载

 1 package com.test;
 2 
 3 import java.io.FileNotFoundException;
 4 import java.io.FileOutputStream;
 5 import java.io.IOException;
 6 import java.io.InputStream;
 7 import java.net.URL;
 8 import java.net.URLConnection;
 9 import java.text.DecimalFormat;
10 import java.text.SimpleDateFormat;
11 import java.util.Date;
12 
13 public class TestFile {
14 
15     public static void main(String[] args) {
16         try {
17             int byteSum = 0;//已下载字节数
18             int byteRead = 0;//读取字节数
19             int byteCount = 0;//总字节数
20             String filePath = "http://123.157.149.169/down/37f3e48bf5a412ea27f01be2b5e00a4c-18173940/%5BROSI%5D2013.09.22%20NO.659%5B25%2B1P%5D.rar?cts=223A167A86A3&ctp=223A167A86A3&ctt=1379946470&limit=3&spd=0&ctk=0d4b4e4b39e9b9a1c8d4104e07a79c90&chk=37f3e48bf5a412ea27f01be2b5e00a4c-18173940&mtd=1";
21             URL url = new URL(filePath);
22             URLConnection conn = url.openConnection();
23             //获取文件名
24             String path = url.getPath();
25             Date d = new Date();
26             SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssms");
27             String fileName = sdf.format(d) + path.substring(path.lastIndexOf("."));
28             System.out.println("文件名称："+ fileName );
29             //获取总字节数
30             byteCount = conn.getContentLength();
31             double len = Double.parseDouble(byteCount+"")/(1024*1024);
32             DecimalFormat df = new DecimalFormat("0.##");
33             System.out.println("文件大小：" + df.format(len) + "MB");
34             
35             InputStream inStream = conn.getInputStream();
36             FileOutputStream fs = new FileOutputStream("E:/"+fileName);
37             byte[] buffer = new byte[1204];
38             System.out.println("文件开始下载....");
39             while (( byteRead = inStream.read(buffer)) != -1) {
40                 byteSum += byteRead;
41                 int num = byteSum*100/Integer.parseInt(byteCount+"");
42                 System.out.println("已下载"+ num +"%....");
43                 fs.write(buffer, 0, byteRead);
44             }
45             System.out.println("文件下载完成！");
46         } catch (FileNotFoundException e) {
47             e.printStackTrace();
48         } catch (IOException e) {
49             e.printStackTrace();
50         }
51     }
52 }

 1 import java.io.IOException;
 2 import java.io.PrintWriter;
 3   
 4 import javax.servlet.ServletException;
 5 import javax.servlet.ServletOutputStream;
 6 import javax.servlet.http.HttpServlet;
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9 /**
10  * 利用Servlet导出Excel
11  * @author CHUNBIN
12  *
13  */
14 public class ExportExcelServlet extends HttpServlet {
15        
16        public void doGet(HttpServletRequest request, HttpServletResponse response)
17                      throws ServletException, IOException {
18               doPost(request, response);
19        }
20   
21        public void doPost(HttpServletRequest request, HttpServletResponse response)
22                      throws ServletException, IOException {
23               request.setCharacterEncoding("UTF-8");//设置request的编码方式，防止中文乱码
24               String fileName ="导出数据";//设置导出的文件名称
25               StringBuffer sb = new StringBuffer(request.getParameter("tableInfo"));//将表格信息放入内存
26               String contentType = "application/vnd.ms-excel";//定义导出文件的格式的字符串
27               String recommendedName = new String(fileName.getBytes(),"iso_8859_1");//设置文件名称的编码格式
28               response.setContentType(contentType);//设置导出文件格式
29               response.setHeader("Content-Disposition", "attachment; filename=" + recommendedName + "\"");//
30               response.resetBuffer();
31               //利用输出输入流导出文件
32               ServletOutputStream sos = response.getOutputStream();
33               sos.write(sb.toString().getBytes());
34               sos.flush();
35               sos.close();
36        }
37 }

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 7 <title>导出Excel</title>
 8 <script type="text/javascript">
 9     function test(){
10        document.getElementById("tableInfo").value=document.getElementById("table").innerHTML;
11     }
12 </script>
13 <style>
14     body{font-family:宋体;font-size:11pt}
15 </style>
16 </head>
17 <body>
18 <form action="<%=request.getContextPath()%>/servlet/ExportExcelServlet" method="post">
19     <span id="table">
20     <table bgcolor="#EEECF2" bordercolor="#A3B2CC" border="1" cellspacing="0">
21        <tr><th>学号</th><th>姓名</th><th>科目</th><th>分数</th></tr>
22        <tr><td>10001</td><td>赵二</td><td>高数</td><td>82</td></tr>
23        <tr><td>10002</td><td>张三</td><td>高数</td><td>94</td></tr>
24        <tr><td>10001</td><td>赵二</td><td>线数</td><td>77</td></tr>
25        <tr><td>10002</td><td>张三</td><td>线数</td><td>61</td></tr>
26     </table>
27     </span>
28     <input type="submit" name="Excel" value="导出表格" onclick="test()"/>
29     <input type="hidden" id="tableInfo" name="tableInfo" value=""/>
30 </form>
31 </body>
32 </html>

  1 <%@ page language="java" contentType="text/html; charset=UTF-8"
  2     pageEncoding="UTF-8"%>
  3 <%@ page import="java.util.*,java.io.*"%>
  4 <%@ page import="java.text.SimpleDateFormat"%>
  5 <%@ page import="org.apache.commons.fileupload.*"%>
  6 <%@ page import="org.apache.commons.fileupload.disk.*"%>
  7 <%@ page import="org.apache.commons.fileupload.servlet.*"%>
  8 <%@ page import="com.opensymphony.xwork2.ActionContext"%>
  9 <%@ page
 10     import="org.apache.struts2.dispatcher.multipart.MultiPartRequestWrapper"%>
 11 <%@ page import="org.json.simple.*"%>
 12 <%
 13     //文件保存目录路径
 14     String savePath = pageContext.getServletContext().getRealPath("/")
 15             + "kindeditor/attached/";
 16 
 17     //文件保存目录URL
 18     String saveUrl = request.getContextPath() + "/kindeditor/attached/";
 19 
 20     //定义允许上传的文件扩展名
 21     HashMap<String, String> extMap = new HashMap<String, String>();
 22     extMap.put("image", "gif,jpg,jpeg,png,bmp");
 23     extMap.put("flash", "swf,flv");
 24     extMap.put("media",
 25             "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
 26     extMap.put("file",
 27             "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");
 28 
 29     //最大文件大小
 30     long maxSize = 1000000;
 31 
 32     response.setContentType("text/html; charset=UTF-8");
 33 
 34     if (!ServletFileUpload.isMultipartContent(request)) {
 35         out.println(getError("请选择文件。"));
 36         return;
 37     }
 38     //检查目录
 39     File uploadDir = new File(savePath);
 40     if (!uploadDir.isDirectory()) {
 41         out.println(getError("上传目录不存在。"));
 42         return;
 43     }
 44     //检查目录写权限
 45     if (!uploadDir.canWrite()) {
 46         out.println(getError("上传目录没有写权限。"));
 47         return;
 48     }
 49 
 50     String dirName = request.getParameter("dir");
 51     if (dirName == null) {
 52         dirName = "image";
 53     }
 54     if (!extMap.containsKey(dirName)) {
 55         out.println(getError("目录名不正确。"));
 56         return;
 57     }
 58     //创建文件夹
 59     savePath += dirName + "/";
 60     saveUrl += dirName + "/";
 61     File saveDirFile = new File(savePath);
 62     if (!saveDirFile.exists()) {
 63         saveDirFile.mkdirs();
 64     }
 65     SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
 66     String ymd = sdf.format(new Date());
 67     savePath += ymd + "/";
 68     saveUrl += ymd + "/";
 69     File dirFile = new File(savePath);
 70     if (!dirFile.exists()) {
 71         dirFile.mkdirs();
 72     }
 73     MultiPartRequestWrapper wrapper = (MultiPartRequestWrapper) request;
 74 
 75     //获得上传的文件名     
 76     String fileName = wrapper.getFileNames("imgFile")[0];//imgFile,imgFile,imgFile     
 77 
 78     //获得文件过滤器     
 79     File file = wrapper.getFiles("imgFile")[0];
 80 
 81     //检查扩展名     
 82     String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1)
 83             .toLowerCase();
 84     if (!Arrays.<String> asList(extMap.get(dirName).split(","))
 85             .contains(fileExt)) {
 86         out.println(getError("上传文件扩展名是不允许的扩展名。\n只允许"
 87                 + extMap.get(dirName) + "格式。"));
 88         return;
 89     }
 90 
 91     //检查文件大小     
 92     if (file.length() > maxSize) {
 93         out.println(getError("上传文件大小超过限制。"));
 94         return;
 95     }
 96 
 97     //重构上传图片的名称      
 98     SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
 99     String newImgName = df.format(new Date()) + "_"
100             + new Random().nextInt(1000) + "." + fileExt;
101     byte[] buffer = new byte[1024];
102 
103     //获取文件输出流     
104     FileOutputStream fos = new FileOutputStream(savePath + "/"
105             + newImgName);
106 
107     //System.out.println("########" + saveUrl + "@@"+ newImgName);  
108     //获取内存中当前文件输入流     
109     InputStream in = new FileInputStream(file);
110     try {
111         int num = 0;
112         while ((num = in.read(buffer)) > 0) {
113             fos.write(buffer, 0, num);
114         }
115     } catch (Exception e) {
116         e.printStackTrace(System.err);
117     } finally {
118         in.close();
119         fos.close();
120     }
121 
122     JSONObject obj = new JSONObject();
123     obj.put("error", 0);
124     obj.put("url", saveUrl + newImgName);
125     out.println(obj.toJSONString());
126 %>
127 <%!private String getError(String message) {
128         JSONObject obj = new JSONObject();
129         obj.put("error", 1);
130         obj.put("message", message);
131         return obj.toJSONString();
132     }%>

 1 public String download() throws Exception {
 2       uploadFileName="中文.jpg";
 3         downStream = ServletActionContext.getServletContext()
 4                 .getResourceAsStream(inputPath);
 5         return SUCCESS;
 6     }
 7 
 8 <action name="download" class="upload.DownloadAction" method="download">
 9             <!-- 指定被下载资源的位置 -->
10             <param name="inputPath">\download\中文.jpg</param>
11             <!-- 配置结果类型为stream的结果 -->
12             <result name="success" type="stream">
13                 <!-- 指定返回下载文件的InputStream -->
14                 <param name="inputName">downStream</param>
15                 <!-- 指定下载文件的文件类型 -->
16                 <param name="contentType">image/jpg</param>
17                 <param name="contentDisposition">attachment;filename=${uploadFileName}</param>
18                 <!-- 指定下载文件的缓冲大小 -->
19                 <param name="bufferSize">4096</param>
20             </result>
21             <result name="input">/upload.jsp
22         </result>
23         </action>
24  
25 页面
26     <a href="download.action">下载包含中文文件名的文件</a>

 1 /这一段代码我也是不知道是哪里的   先放上去  以后再看吧
 2 
 3 public String executeCommandUDownload(ActionContext context)throws Exception{
 4         HttpServletResponse response = context.getResponse();
 5         response.setCharacterEncoding("UTF-8");
 6         boolean isOnLine = false;
 7         String fileName = context.getRequest().getParameter("fileName");
 8          
 9                 Connection con = null;
10         HttpServletRequest request = context.getRequest();
11         String filePath = null;
12         BufferedInputStream buffer=null;
13         OutputStream out=null;
14         try
15         {
16             con = this.getConnection(context);
17             if("".equals(fileName) || fileName == null){
18                 FileInfoBean bean = new FileInfoBean();
19                 fileName = bean.findName(con, id);
20                  
21             }
22              
23              
24              
25             File f = new File(filePath);
26                       //检查该文件是否存在
27             if(!f.exists()){
28                 response.sendError(404,"File not found!");
29                 return "File not found!";
30             }
31             buffer = new BufferedInputStream(new FileInputStream(f));
32             byte[] buf = new byte[1024];
33             int len = 0;
34          
35             response.reset(); //非常重要
36             if(isOnLine){ //在线打开方式
37                 URL u = new URL("file:///"+filePath);
38                 response.setContentType(u.openConnection().getContentType());
39                 response.setHeader("Content-Disposition", "inline; filename="+(f.getName()).getBytes("gbk"));
40             //文件名应该编码成UTF-8
41             }
42             else{ //纯下载方式
43  
44                 response.setContentType("application/x-msdownload"); 
45                  
46                 response.setHeader("Content-Disposition", "attachment; filename=" + java.net.URLEncoder.encode(f.getName(),"UTF-8")); 
47                  
48             }
49             out = response.getOutputStream();
50             while((len = buffer.read(buf)) >0)
51                 out.write(buf,0,len);
52         }catch(Throwable e)
53         {
54             e.printStackTrace();
55         }finally
56         {
57             try
58             {
59                 buffer.close();
60                 out.close();
61             }catch(Throwable e)
62             {
63                 e.printStackTrace();   
64             }
65         }
66         return "";
67     }