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📁 JspServlet教程专栏 对javaservlet讲述的非常详细
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<p align="center"><big><strong>一个文件上传JAVABEAN</strong></big></p>
<div align="right">---&nbsp;（文/crazybean）</div>

<br>package&nbsp; com.upload;&nbsp; <br>
<br>
import&nbsp; java.io.*;&nbsp; <br>
import&nbsp; javax.servlet.http.HttpServletRequest;&nbsp; <br>
import&nbsp; javax.servlet.ServletInputStream;&nbsp; <br>
import&nbsp; javax.servlet.ServletException;&nbsp; <br>
<br>
public&nbsp; class&nbsp; upload{&nbsp; <br>
private&nbsp; static&nbsp; String&nbsp; newline&nbsp; =&nbsp; "\n";&nbsp; <br>
private&nbsp; String&nbsp; uploadDirectory&nbsp; =&nbsp; ".";&nbsp; <br>
private&nbsp; String&nbsp; ContentType&nbsp; =&nbsp; "";&nbsp; <br>
private&nbsp; String&nbsp; CharacterEncoding&nbsp; =&nbsp; "";&nbsp; <br>
<br>
private&nbsp; String&nbsp; getFileName(String&nbsp; s){&nbsp; <br>
int&nbsp; i&nbsp; =&nbsp; s.lastIndexOf("\\");&nbsp; <br>
if(i&nbsp; &lt;&nbsp; 0&nbsp; //&nbsp; i&nbsp; >=&nbsp; s.length()&nbsp; -&nbsp; 1){&nbsp; <br>
i&nbsp; =&nbsp; s.lastIndexOf("/");&nbsp; <br>
if(i&nbsp; &lt;&nbsp; 0&nbsp; //&nbsp; i&nbsp; >=&nbsp; s.length()&nbsp; -&nbsp; 1)&nbsp; <br>
return&nbsp; s;&nbsp; <br>
}&nbsp; <br>
return&nbsp; s.substring(i&nbsp; +&nbsp; 1);&nbsp; <br>
}&nbsp; <br>
<br>
public&nbsp; void&nbsp; setUploadDirectory(String&nbsp; s){&nbsp; <br>
uploadDirectory&nbsp; =&nbsp; s;&nbsp; <br>
}&nbsp; <br>
<br>
public&nbsp; void&nbsp; setContentType(String&nbsp; s){&nbsp; <br>
ContentType&nbsp; =&nbsp; s;&nbsp; <br>
int&nbsp; j;&nbsp; <br>
if((j&nbsp; =&nbsp; ContentType.indexOf("boundary="))&nbsp; !=&nbsp; -1){&nbsp; <br>
ContentType&nbsp; =&nbsp; ContentType.substring(j&nbsp; +&nbsp; 9);&nbsp; <br>
ContentType&nbsp; =&nbsp; "--"&nbsp; +&nbsp; ContentType;&nbsp; <br>
}&nbsp; <br>
}&nbsp; <br>
<br>
public&nbsp; void&nbsp; setCharacterEncoding(String&nbsp; s){&nbsp; <br>
CharacterEncoding&nbsp; =&nbsp; s;&nbsp; <br>
}&nbsp; <br>
<br>
public&nbsp; void&nbsp; uploadFile(&nbsp; HttpServletRequest&nbsp; req)&nbsp; throws&nbsp; ServletException,&nbsp; IOException{&nbsp; <br>
setCharacterEncoding(req.getCharacterEncoding());&nbsp; <br>
setContentType(req.getContentType());&nbsp; <br>
uploadFile(req.getInputStream());&nbsp; <br>
}&nbsp; <br>
<br>
public&nbsp; void&nbsp; uploadFile(&nbsp; ServletInputStream&nbsp; servletinputstream)&nbsp; throws&nbsp; ServletException,&nbsp; IOException{&nbsp; <br>
<br>
String&nbsp; s5&nbsp; =&nbsp; null;&nbsp; <br>
String&nbsp; filename&nbsp; =&nbsp; null;&nbsp; <br>
byte&nbsp; Linebyte[]&nbsp; =&nbsp; new&nbsp; byte[4096];&nbsp; <br>
byte&nbsp; outLinebyte[]&nbsp; =&nbsp; new&nbsp; byte[4096];&nbsp; <br>
int&nbsp; ai[]&nbsp; =&nbsp; new&nbsp; int[1];&nbsp; <br>
int&nbsp; ai1[]&nbsp; =&nbsp; new&nbsp; int[1];&nbsp; <br>
<br>
String&nbsp; line;&nbsp; <br>
//得到文件名&nbsp; <br>
while((line&nbsp; =&nbsp; readLine(Linebyte,&nbsp; ai,&nbsp; servletinputstream,&nbsp; CharacterEncoding))&nbsp; !=&nbsp; null){&nbsp; <br>
int&nbsp; i&nbsp; =&nbsp; line.indexOf("filename=");&nbsp; <br>
if(i&nbsp; >=&nbsp; 0){&nbsp; <br>
line&nbsp; =&nbsp; line.substring(i&nbsp; +&nbsp; 10);&nbsp; <br>
if((i&nbsp; =&nbsp; line.indexOf("\""))&nbsp; >&nbsp; 0)&nbsp; <br>
line&nbsp; =&nbsp; line.substring(0,&nbsp; i);&nbsp; <br>
break;&nbsp; <br>
}&nbsp; <br>
}&nbsp; <br>
<br>
filename&nbsp; =&nbsp; line;&nbsp; <br>
<br>
if(filename&nbsp; !=&nbsp; null&nbsp; &&&nbsp; !filename.equals("\"")){&nbsp; <br>
filename&nbsp; =&nbsp; getFileName(filename);&nbsp; <br>
<br>
String&nbsp; sContentType&nbsp; =&nbsp; readLine(Linebyte,&nbsp; ai,&nbsp; servletinputstream,&nbsp; CharacterEncoding);&nbsp; <br>
if(sContentType.indexOf("Content-Type")&nbsp; >=&nbsp; 0)&nbsp; <br>
readLine(Linebyte,&nbsp; ai,&nbsp; servletinputstream,&nbsp; CharacterEncoding);&nbsp; <br>
<br>
//File(String&nbsp; parent,&nbsp; String&nbsp; child)&nbsp; <br>
//Creates&nbsp; a&nbsp; new&nbsp; File&nbsp; instance&nbsp; from&nbsp; a&nbsp; parent&nbsp; pathname&nbsp; string&nbsp; <br>
//and&nbsp; a&nbsp; child&nbsp; pathname&nbsp; string.&nbsp; <br>
File&nbsp; file&nbsp; =&nbsp; new&nbsp; File(uploadDirectory,&nbsp; filename);&nbsp; <br>
<br>
//FileOutputStream(File&nbsp; file)&nbsp; <br>
//Creates&nbsp; a&nbsp; file&nbsp; output&nbsp; stream&nbsp; to&nbsp; write&nbsp; to&nbsp; the&nbsp; file&nbsp; represented&nbsp; <br>
//by&nbsp; the&nbsp; specified&nbsp; File&nbsp; object.&nbsp; <br>
FileOutputStream&nbsp; fileoutputstream&nbsp; =&nbsp; new&nbsp; FileOutputStream(file);&nbsp; <br>
<br>
while((sContentType&nbsp; =&nbsp; readLine(Linebyte,&nbsp; ai,&nbsp; servletinputstream,&nbsp; CharacterEncoding))&nbsp; !=&nbsp; null){&nbsp; <br>
if(sContentType.indexOf(ContentType)&nbsp; ==&nbsp; 0&nbsp; &&&nbsp; Linebyte[0]&nbsp; ==&nbsp; 45)&nbsp; <br>
break;&nbsp; <br>
<br>
if(s5&nbsp; !=&nbsp; null){&nbsp; <br>
//write(byte[]&nbsp; b,&nbsp; int&nbsp; off,&nbsp; int&nbsp; len)&nbsp; <br>
//Writes&nbsp; len&nbsp; bytes&nbsp; from&nbsp; the&nbsp; specified&nbsp; byte&nbsp; array&nbsp; starting&nbsp; <br>
//at&nbsp; offset&nbsp; off&nbsp; to&nbsp; this&nbsp; file&nbsp; output&nbsp; stream.&nbsp; <br>
fileoutputstream.write(outLinebyte,&nbsp; 0,&nbsp; ai1[0]);&nbsp; <br>
fileoutputstream.flush();&nbsp; <br>
}&nbsp; <br>
s5&nbsp; =&nbsp; readLine(outLinebyte,&nbsp; ai1,&nbsp; servletinputstream,&nbsp; CharacterEncoding);&nbsp; <br>
if(s5&nbsp; ==&nbsp; null&nbsp; //&nbsp; s5.indexOf(ContentType)&nbsp; ==&nbsp; 0&nbsp; &&&nbsp; outLinebyte[0]&nbsp; ==&nbsp; 45)&nbsp; <br>
break;&nbsp; <br>
fileoutputstream.write(Linebyte,&nbsp; 0,&nbsp; ai[0]);&nbsp; <br>
fileoutputstream.flush();&nbsp; <br>
}&nbsp; <br>
<br>
byte&nbsp; byte0;&nbsp; <br>
if(newline.length()&nbsp; ==&nbsp; 1)&nbsp; <br>
byte0&nbsp; =&nbsp; 2;&nbsp; <br>
else&nbsp; <br>
byte0&nbsp; =&nbsp; 1;&nbsp; <br>
if(s5&nbsp; !=&nbsp; null&nbsp; &&&nbsp; outLinebyte[0]&nbsp; !=&nbsp; 45&nbsp; &&&nbsp; ai1[0]&nbsp; >&nbsp; newline.length()&nbsp; *&nbsp; byte0)&nbsp; <br>
fileoutputstream.write(outLinebyte,&nbsp; 0,&nbsp; ai1[0]&nbsp; -&nbsp; newline.length()&nbsp; *&nbsp; byte0);&nbsp; <br>
if(sContentType&nbsp; !=&nbsp; null&nbsp; &&&nbsp; Linebyte[0]&nbsp; !=&nbsp; 45&nbsp; &&&nbsp; ai[0]&nbsp; >&nbsp; newline.length()&nbsp; *&nbsp; byte0)&nbsp; <br>
fileoutputstream.write(Linebyte,&nbsp; 0,&nbsp; ai[0]&nbsp; -&nbsp; newline.length()&nbsp; *&nbsp; byte0);&nbsp; <br>
<br>
fileoutputstream.close();&nbsp; <br>
}&nbsp; <br>
}&nbsp; <br>
<br>
private&nbsp; String&nbsp; readLine(byte&nbsp; Linebyte[],&nbsp; int&nbsp; ai[],&nbsp; <br>
ServletInputStream&nbsp; servletinputstream,&nbsp; <br>
String&nbsp; CharacterEncoding){&nbsp; <br>
try{&nbsp; <br>
//readLine(byte[]&nbsp; buffer,&nbsp; int&nbsp; offset,&nbsp; int&nbsp; length)&nbsp; <br>
//Reads&nbsp; a&nbsp; line&nbsp; from&nbsp; the&nbsp; POST&nbsp; data.&nbsp; <br>
ai[0]&nbsp; =&nbsp; servletinputstream.readLine(Linebyte,&nbsp; 0,&nbsp; Linebyte.length);&nbsp; <br>
if(ai[0]&nbsp; ==&nbsp; -1)&nbsp; <br>
return&nbsp; null;&nbsp; <br>
}catch(IOException&nbsp; _ex){&nbsp; <br>
return&nbsp; null;&nbsp; <br>
}&nbsp; <br>
try{&nbsp; <br>
if(CharacterEncoding&nbsp; ==&nbsp; null){&nbsp; <br>
//用缺省的编码方式把给定的byte数组转换为字符串&nbsp; <br>
//String(byte[]&nbsp; bytes,&nbsp; int&nbsp; offset,&nbsp; int&nbsp; length)&nbsp; <br>
return&nbsp; new&nbsp; String(Linebyte,&nbsp; 0,&nbsp; ai[0]);&nbsp; <br>
}else{&nbsp; <br>
//用给定的编码方式把给定的byte数组转换为字符串&nbsp; <br>
//String(byte[]&nbsp; bytes,&nbsp; int&nbsp; offset,&nbsp; int&nbsp; length,&nbsp; String&nbsp; enc)&nbsp; <br>
return&nbsp; new&nbsp; String(Linebyte,&nbsp; 0,&nbsp; ai[0],&nbsp; CharacterEncoding);&nbsp; <br>
}&nbsp; <br>
}catch(Exception&nbsp; _ex){&nbsp; <br>
return&nbsp; null;&nbsp; <br>
}&nbsp; <br>
}&nbsp; <br>
/*&nbsp; <br>
public&nbsp; int&nbsp; readLine(byte[]&nbsp; buffer,&nbsp; <br>
int&nbsp; offset,&nbsp; <br>
int&nbsp; length)&nbsp; throws&nbsp; java.io.IOException&nbsp; <br>
从POST来的数据中读一行&nbsp; <br>
参数:&nbsp; <br>
buffer&nbsp; -&nbsp; buffer&nbsp; to&nbsp; hold&nbsp; the&nbsp; line&nbsp; data&nbsp; <br>
offset&nbsp; -&nbsp; offset&nbsp; into&nbsp; the&nbsp; buffer&nbsp; to&nbsp; start&nbsp; <br>
length&nbsp; -&nbsp; maximum&nbsp; number&nbsp; of&nbsp; bytes&nbsp; to&nbsp; read.&nbsp; <br>
Returns:&nbsp; <br>
number&nbsp; of&nbsp; bytes&nbsp; read&nbsp; or&nbsp; -1&nbsp; on&nbsp; the&nbsp; end&nbsp; of&nbsp; line.&nbsp; <br>
*/&nbsp; <br>
}&nbsp; <br>
<br>
<br>
upload.jsp&nbsp; <br>
&lt;%@page&nbsp; import="com.upload.upload"%>&nbsp; <br>
&lt;%&nbsp; <br>
String&nbsp; Dir&nbsp; =&nbsp; "/home/tonywan/upload";&nbsp; <br>
<br>
upload&nbsp; upload&nbsp; =&nbsp; new&nbsp; upload();&nbsp; <br>
upload.setUploadDirectory(Dir);&nbsp; <br>
upload.uploadFile(request);&nbsp; <br>
out.print("&lt;center>&lt;font&nbsp; color=red>成功上载文件至"&nbsp; +&nbsp; Dir&nbsp; +&nbsp; "&lt;/font>&lt;/center>");&nbsp; <br>
%>&nbsp; <br>
<br>
<br>
upload.html&nbsp; <br>
&lt;center>File&nbsp; upload&nbsp; test&lt;/center>&nbsp; <br>
&lt;br>&nbsp; <br>
&lt;table>&lt;tr>&nbsp; <br>
&lt;form&nbsp; method="post"&nbsp; enctype="multipart/form-data"&nbsp; action="upload.jsp">&nbsp; <br>
&lt;td>&nbsp; &lt;input&nbsp; type=file&nbsp; size=20&nbsp; name="fname">&nbsp; &lt;/td>&nbsp; <br>
&lt;td>&nbsp; &lt;input&nbsp; type=Submit&nbsp; value=Upload>&nbsp; &lt;/td>&nbsp; &lt;/form>&nbsp; <br>
&lt;/tr>&lt;/table>&nbsp; <br>
<br>
<br>
<br>
不知道大家看地懂吗？反正使用起来很简单的，只要设置一下上传路径就可以了。&nbsp; 

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