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<p align="center"><big><strong>一個文件上傳JAVABEAN</strong></big></p>
<div align="right">--- （文/crazybean）</div>
<br>package com.upload; <br>
<br>
import java.io.*; <br>
import javax.servlet.http.HttpServletRequest; <br>
import javax.servlet.ServletInputStream; <br>
import javax.servlet.ServletException; <br>
<br>
public class upload{ <br>
private static String newline = "\n"; <br>
private String uploadDirectory = "."; <br>
private String ContentType = ""; <br>
private String CharacterEncoding = ""; <br>
<br>
private String getFileName(String s){ <br>
int i = s.lastIndexOf("\\"); <br>
if(i < 0 // i >= s.length() - 1){ <br>
i = s.lastIndexOf("/"); <br>
if(i < 0 // i >= s.length() - 1) <br>
return s; <br>
} <br>
return s.substring(i + 1); <br>
} <br>
<br>
public void setUploadDirectory(String s){ <br>
uploadDirectory = s; <br>
} <br>
<br>
public void setContentType(String s){ <br>
ContentType = s; <br>
int j; <br>
if((j = ContentType.indexOf("boundary=")) != -1){ <br>
ContentType = ContentType.substring(j + 9); <br>
ContentType = "--" + ContentType; <br>
} <br>
} <br>
<br>
public void setCharacterEncoding(String s){ <br>
CharacterEncoding = s; <br>
} <br>
<br>
public void uploadFile( HttpServletRequest req) throws ServletException, IOException{ <br>
setCharacterEncoding(req.getCharacterEncoding()); <br>
setContentType(req.getContentType()); <br>
uploadFile(req.getInputStream()); <br>
} <br>
<br>
public void uploadFile( ServletInputStream servletinputstream) throws ServletException, IOException{ <br>
<br>
String s5 = null; <br>
String filename = null; <br>
byte Linebyte[] = new byte[4096]; <br>
byte outLinebyte[] = new byte[4096]; <br>
int ai[] = new int[1]; <br>
int ai1[] = new int[1]; <br>
<br>
String line; <br>
//得到文件名 <br>
while((line = readLine(Linebyte, ai, servletinputstream, CharacterEncoding)) != null){ <br>
int i = line.indexOf("filename="); <br>
if(i >= 0){ <br>
line = line.substring(i + 10); <br>
if((i = line.indexOf("\"")) > 0) <br>
line = line.substring(0, i); <br>
break; <br>
} <br>
} <br>
<br>
filename = line; <br>
<br>
if(filename != null && !filename.equals("\"")){ <br>
filename = getFileName(filename); <br>
<br>
String sContentType = readLine(Linebyte, ai, servletinputstream, CharacterEncoding); <br>
if(sContentType.indexOf("Content-Type") >= 0) <br>
readLine(Linebyte, ai, servletinputstream, CharacterEncoding); <br>
<br>
//File(String parent, String child) <br>
//Creates a new File instance from a parent pathname string <br>
//and a child pathname string. <br>
File file = new File(uploadDirectory, filename); <br>
<br>
//FileOutputStream(File file) <br>
//Creates a file output stream to write to the file represented <br>
//by the specified File object. <br>
FileOutputStream fileoutputstream = new FileOutputStream(file); <br>
<br>
while((sContentType = readLine(Linebyte, ai, servletinputstream, CharacterEncoding)) != null){ <br>
if(sContentType.indexOf(ContentType) == 0 && Linebyte[0] == 45) <br>
break; <br>
<br>
if(s5 != null){ <br>
//write(byte[] b, int off, int len) <br>
//Writes len bytes from the specified byte array starting <br>
//at offset off to this file output stream. <br>
fileoutputstream.write(outLinebyte, 0, ai1[0]); <br>
fileoutputstream.flush(); <br>
} <br>
s5 = readLine(outLinebyte, ai1, servletinputstream, CharacterEncoding); <br>
if(s5 == null // s5.indexOf(ContentType) == 0 && outLinebyte[0] == 45) <br>
break; <br>
fileoutputstream.write(Linebyte, 0, ai[0]); <br>
fileoutputstream.flush(); <br>
} <br>
<br>
byte byte0; <br>
if(newline.length() == 1) <br>
byte0 = 2; <br>
else <br>
byte0 = 1; <br>
if(s5 != null && outLinebyte[0] != 45 && ai1[0] > newline.length() * byte0) <br>
fileoutputstream.write(outLinebyte, 0, ai1[0] - newline.length() * byte0); <br>
if(sContentType != null && Linebyte[0] != 45 && ai[0] > newline.length() * byte0) <br>
fileoutputstream.write(Linebyte, 0, ai[0] - newline.length() * byte0); <br>
<br>
fileoutputstream.close(); <br>
} <br>
} <br>
<br>
private String readLine(byte Linebyte[], int ai[], <br>
ServletInputStream servletinputstream, <br>
String CharacterEncoding){ <br>
try{ <br>
//readLine(byte[] buffer, int offset, int length) <br>
//Reads a line from the POST data. <br>
ai[0] = servletinputstream.readLine(Linebyte, 0, Linebyte.length); <br>
if(ai[0] == -1) <br>
return null; <br>
}catch(IOException _ex){ <br>
return null; <br>
} <br>
try{ <br>
if(CharacterEncoding == null){ <br>
//用缺省的編碼方式把給定的byte數組轉換為字符串 <br>
//String(byte[] bytes, int offset, int length) <br>
return new String(Linebyte, 0, ai[0]); <br>
}else{ <br>
//用給定的編碼方式把給定的byte數組轉換為字符串 <br>
//String(byte[] bytes, int offset, int length, String enc) <br>
return new String(Linebyte, 0, ai[0], CharacterEncoding); <br>
} <br>
}catch(Exception _ex){ <br>
return null; <br>
} <br>
} <br>
/* <br>
public int readLine(byte[] buffer, <br>
int offset, <br>
int length) throws java.io.IOException <br>
從POST來的數據中讀一行 <br>
參數: <br>
buffer - buffer to hold the line data <br>
offset - offset into the buffer to start <br>
length - maximum number of bytes to read. <br>
Returns: <br>
number of bytes read or -1 on the end of line. <br>
*/ <br>
} <br>
<br>
<br>
upload.jsp <br>
<%@page import="com.upload.upload"%> <br>
<% <br>
String Dir = "/home/tonywan/upload"; <br>
<br>
upload upload = new upload(); <br>
upload.setUploadDirectory(Dir); <br>
upload.uploadFile(request); <br>
out.print("<center><font color=red>成功上載文件至" + Dir + "</font></center>"); <br>
%> <br>
<br>
<br>
upload.html <br>
<center>File upload test</center> <br>
<br> <br>
<table><tr> <br>
<form method="post" enctype="multipart/form-data" action="upload.jsp"> <br>
<td> <input type=file size=20 name="fname"> </td> <br>
<td> <input type=Submit value=Upload> </td> </form> <br>
</tr></table> <br>
<br>
<br>
<br>
不知道大家看地懂嗎？反正使用起來很簡單的，只要設置一下上傳路徑就可以了。
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