JSP文件下载、上传

小鱼儿 2022-08-02 14:47 159阅读 0赞

JSP文件下载-----------------------------------------------------------------

<%@ page contentType="text/html; charset=GBK"%> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ page import="java.io.File"%> <%@page import="java.io.InputStream"%> <%@page import="java.io.FileInputStream"%> <% String path = request.getParameter("path") ; if(path==null || "".equals(path))\{ out.write("<script type="text/javascript"><script>") ; \} String realPath = "c:/myfile/正文.doc" ; File file = new File(realPath) ; if(!file.exists())\{ out.write("<mce:script type="text/javascript"></mce:script>") ; \}else\{ long l = file.length() ; InputStream in = new FileInputStream(file) ; String fs = file.getName() ; if(in!=null)\{ response.reset(); response.setContentType("application/x-msdownload"); response.setHeader("Content-disposition","attachment; filename="+new String(fs.getBytes("GBK"),"iso8859-1")); //以上输出文件元信息 response.setContentLength((int)l); //设置输入文件长度 byte\[\] b = new byte\[2048\]; int len = 0; while((len=in.read(b)) >0) response.getOutputStream().write(b,0,len); //向浏览器输出 in.close(); //关闭文件输入流 response.flushBuffer(); out.clear(); out = pageContext.pushBody(); \} \} %>

文件上传----------------------------------------------------------------------

提交页面-------------

action页面-----------

<% my.file.UploadFile f = new UploadFile(); f.upLoad(request); //上传 f.getParameter("username"); //获取提交的参数 %>

类文件------------

package my.file; import javax.servlet.http.HttpServletRequest; import java.io.\*; import java.util.HashMap; /\*\* \* 文件上传 \* 采用byte解析，只能上传单个文件，支持传递文件的同时，url参数 \* @author 胡晶 \* @version 1.0 \* @date 2009-9-9 \* @class\_displayName UploadFile \*/ public class UploadFile \{ public static final int MAX\_SIZE = 1024 \* 1024 \* 100; public static String FILE\_DIR = "c:/"; private int file\_Size = 0; private String file\_Path = ""; private HashMap hm = new HashMap(); public String upLoad(HttpServletRequest req) \{ String tmpString = ""; String result = ""; DataInputStream dis = null; FILE\_DIR = req.getContextPath(); System.out.println("FILE\_DIR==="+FILE\_DIR); try \{ dis = new DataInputStream(req.getInputStream()); String content = req.getContentType(); if (content != null && content.indexOf("multipart/form-data") != -1) \{ int reqSize = req.getContentLength(); byte\[\] data = new byte\[reqSize\]; int bytesRead = 0; int totalBytesRead = 0; int sizeCheck = 0; while (totalBytesRead < reqSize) \{ // check for maximum file size violation sizeCheck = totalBytesRead + dis.available(); if (sizeCheck > MAX\_SIZE) result = "文件太大不能上传..."; bytesRead = dis.read(data, totalBytesRead, reqSize); totalBytesRead += bytesRead; \} tmpString = new String(data); hm = parseAnotherParam(tmpString); // System.out.println("src datatmp |"+new String(data)+"|"); int postion = arrayIndexOf(data, "/r/n".getBytes()); byte\[\] split\_arr = new byte\[postion\]; System.arraycopy(data, 0, split\_arr, 0, postion); // System.out.println("split |"+new String(split\_arr)+"|"); postion = arrayIndexOf(data, "filename=/"".getBytes()); byte\[\] dataTmp = new byte\[data.length - postion\]; System.arraycopy(data, postion, dataTmp, 0, dataTmp.length); data = null; data = dataTmp.clone(); String filePath = null; postion = arrayIndexOf(data, "Content-Type:".getBytes()) - 2; dataTmp = null; dataTmp = new byte\[postion\]; System.arraycopy(data, 0, dataTmp, 0, dataTmp.length); filePath = new String(dataTmp); if (filePath == null && filePath.equals("")) return ""; // System.out.println("filename |"+filePath+"|"); // 分离contentType 并赋值 postion = arrayIndexOf(data, "Content-Type:".getBytes()); dataTmp = null; dataTmp = new byte\[data.length - postion\]; System.arraycopy(data, postion, dataTmp, 0, dataTmp.length); data = null; data = dataTmp.clone(); // System.out.println("src adatatmp |"+new String(data)+"|"); postion = arrayIndexOf(data, "/n".getBytes()) + 1; dataTmp = null; dataTmp = new byte\[data.length - postion\]; System.arraycopy(data, postion, dataTmp, 0, dataTmp.length); data = null; data = dataTmp.clone(); // System.out.println("datatmp |"+new String(data)+"|"); // 分离文件信息 获得最终想要的字节 postion = arrayIndexOf(data, split\_arr); split\_arr = null; dataTmp = null; dataTmp = new byte\[postion - 2\]; System.arraycopy(data, 2, dataTmp, 0, dataTmp.length); data = null; data = dataTmp.clone(); // System.out.println("datatmp |"+new String(data)+"|"); postion = arrayLastIndexOf(data, "/n".getBytes()) - 1; dataTmp = null; dataTmp = new byte\[postion\]; // System.out.println("postion:"+postion + " datalength:"+ // data.length +" tmplength:" + dataTmp.length); System.arraycopy(data, 0, dataTmp, 0, dataTmp.length); data = null; // System.out.println("data |"+new String(dataTmp)+"|"); String file\_path = getFileName(filePath); // System.out.println("file\_path:"+file\_path); if (null != file\_path) \{ if (writeFile(dataTmp, FILE\_DIR + file\_path)) \{ this.file\_Size = dataTmp.length; this.file\_Path = FILE\_DIR + file\_path; result = "文件上传完毕"; \} else \{ result = "文件上传失败"; \} \} else \{ result = "文件名为空"; \} dataTmp = null; \} else \{ result = "content 必须为 multipart/form-data"; \} \} catch (UnsupportedEncodingException ex4) \{ result = "UnsupportedEncodingException错误"; \} catch (NullPointerException e) \{ result = "NullPointerException错误"; \} catch (IOException ex1) \{ result = "IOException 错误 "; \} catch (Exception ex1) \{ result = "Exception 错误 "; \} return result; \} public String getFilePath() \{ return this.file\_Path; \} public int getFileSize() \{ return this.file\_Size; \} public boolean writeFile(byte\[\] data, String path) \{ File f = null; FileOutputStream fos = null; try \{ f = new File(path); f.createNewFile(); fos = new FileOutputStream(f); fos.write(data, 0, data.length); \} catch (FileNotFoundException e) \{ return false; \} catch (IOException e) \{ return false; \} finally \{ try \{ fos.close(); \} catch (IOException e) \{ return false; \} \} return true; \} public String getFileName(String arg) \{ String path = ""; if (arg.equals("/"/"")) \{ return null; \} if (arg.indexOf("/"") > -1) path = arg.substring(arg.indexOf("/"") + 1, arg.lastIndexOf("/"")); else path = arg; // System.out.println("file\_path:"+arg); path = path.substring(path.lastIndexOf("//") + 1); return path; \} // 判断两个byte数组的值是否相等 private boolean arrayEquals(byte\[\] src, byte\[\] value) \{ if (src == null || value == null) return false; if (src.length != value.length) return false; for (int i = 0; i < src.length; i++) \{ if (src\[i\] != value\[i\]) return false; \} return true; \} // 找出value数组在src中的位置, 从前往后 private int arrayIndexOf(byte\[\] src, byte\[\] value) \{ if (src == null || value == null) return -1; if (src.length < value.length) return -1; int postion = -1; for (int i = 0; i < src.length - value.length; i++) \{ postion = i; byte\[\] tmp = new byte\[value.length\]; System.arraycopy(src, i, tmp, 0, tmp.length); if (arrayEquals(tmp, value)) \{ tmp = null; return postion; \} else \{ postion = -1; tmp = null; \} \} return postion; \} // 找出value数组在src中的位置 private int arrayLastIndexOf(byte\[\] src, byte\[\] value) \{ if (src == null || value == null) return -1; if (src.length < value.length) return -1; int postion = -1; for (int i = src.length - value.length; i > -1; i--) \{ postion = i; byte\[\] tmp = new byte\[value.length\]; System.arraycopy(src, i, tmp, 0, tmp.length); // System.out.println(i); // Common.PrintDataHex(tmp, " "); // Common.PrintDataHex(value, " "); if (arrayEquals(tmp, value)) \{ tmp = null; return postion; \} else \{ postion = -1; tmp = null; \} \} // System.out.println("debug"); return postion; \} public HashMap parseAnotherParam(String str) \{ HashMap<String, String> hm = new HashMap<String, String>(); String key = ""; String value = ""; int startindex = 0; int endindex = 0; startindex = str.indexOf("Content-Disposition: form-data; name=/"") + "Content-Disposition: form-data; name=/"".length(); endindex = str.indexOf("/"/r/n/r/n"); while (startindex > -1 && endindex > -1) \{ key = str.substring(startindex, endindex); if (!str.substring(endindex, endindex + 5).equals("/"/r/n/r/n")) \{// 去掉没有value的元素 str = str.substring(endindex); startindex = str .indexOf("Content-Disposition: form-data; name=/"") + "Content-Disposition: form-data; name=/"".length(); endindex = str.indexOf("/"/r/n/r/n"); continue; \} if (key.indexOf("/";") > -1) \{// 去掉上传文件的参数以及编码 str = str.substring(str.indexOf("/";") + 2); startindex = str .indexOf("Content-Disposition: form-data; name=/"") + "Content-Disposition: form-data; name=/"".length(); endindex = str.indexOf("/"/r/n/r/n"); continue; \} else str = str.substring(endindex + 5); value = str.substring(0, str.indexOf("/r/n")); str = str.substring(str.indexOf("/r/n") + 2); // System.out.println("key:"+key+" value:"+value); hm.put(key, value); startindex = str.indexOf("Content-Disposition: form-data; name=/"") + "Content-Disposition: form-data; name=/"".length(); endindex = str.indexOf("/"/r/n/r/n"); \} return hm; \} public String getParameter(String param) \{ // System.out.println(hm.toString()); return (String) hm.get(param); \} \}