本文实例为大家分享了jsp使用commons-fileupload实现文件上传代码，供大家参考，具体内容如下
1、准备：
将commons-fileupload-1.1.zip和commons-io-1.1.zip复制到"web-inflib"目录下
2、首先是servlet：fileupload.java
package servlet;
import java.io.file;
import java.io.ioexception;
import java.io.printwriter;
import java.util.*;
import java.util.regex.pattern;
import java.util.regex.matcher;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import org.apache.commons.fileupload.fileitem;
import org.apache.commons.fileupload.fileuploadexception;
import org.apache.commons.fileupload.disk.diskfileitemfactory;
import org.apache.commons.fileupload.servlet.servletfileupload;
public class fileupload extends httpservlet {
private string uploadpath="e:\addnetfile\";//要上传文件的目录
private file temppath=new file("e:\tempfile\");//存放上传的文件的目录
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
response.setcontenttype("text/html;charset=gb2312");
response.setcharacterencoding("gb2312");
printwriter out=response.getwriter();
out.println("请求内容的长度为："+request.getcontentlength());
out.println("请求内容的类型为："+request.getcontenttype());
diskfileitemfactory factory=new diskfileitemfactory();
factory.setrepository(temppath);
factory.setsizethreshold(4096);
servletfileupload upload=new servletfileupload(factory);
upload.setsizemax(1000000);
list<?> fileitems=null;
try{
fileitems=upload.parserequest(request);
iterator<?> iterator=fileitems.iterator();
string regex=".+\\(.+)$";
string[] errortype={".exe",".com",".cgi",".asp"};
pattern p=pattern.compile(regex);
while(iterator.hasnext()){
fileitem item=(fileitem) iterator.next();
if(!item.isformfield()){
string name=item.getname();
long size=item.getsize();
if(name==null||name.equals("")&&size==0)
continue;
matcher m=p.matcher(name);
if(m.find()){
for(int temp=0;temp<errortype.length;temp++){
if(m.group(1).endswith(errortype[temp]))
throw new ioexception(name+":wrong type");
}
try{
item.write(new file(temppath,m.group(1)));
out.println(name+" "+size+"<br/>");
out.println("上传成功");
}catch(exception e){
out.println("333"+e);
}
}
else{
throw new ioexception("fail to upload");
}
}
}
}catch(ioexception e){
out.println("222"+e);
}
catch(fileuploadexception e1){
e1.printstacktrace();
out.println("111"+e1);
}
}
public void init() throws servletexception {
if(!new file(uploadpath).isdirectory())
new file(uploadpath).mkdir();
if(!temppath.isdirectory())
temppath.mkdir();
}
public void destroy(){
super.destroy();
}
}
3、其次是html：uploadfile.html
<!doctype html public "-//w3c//dtd html 4.01 transitional//en"> <html> <head> <title>uploadfilel.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> </head> <body> <form action="/firstjsp/servlet/fileupload" method="post" enctype="multipart/form-data" name="form1"> <input type="file" name="file"/> <input type="submit" name="submit" value="upload"/> </form> <form action="/firstjsp/servlet/fileupload" method="post" enctype="multipart/form-data" name="uploadform"> <table> <tr> <td> 文件1：<input type="file" name="x" size="40"/> </td> </tr> <tr> <td> 文件2：<input type="file" name="y" size="40"/> </td> </tr> <tr> <td> 文件3：<input type="file" name="z" size="40"/> </td> </tr> </table> <input type="submit" name="upload" value="开始上传"/> </form> </body> </html>
4、最后是配置web.xml
<servlet> <description>this is the description of my j2ee component</description> <display-name>this is the display name of my j2ee component</display-name> <servlet-name>fileupload</servlet-name> <servlet-class>servlet.fileupload</servlet-class> </servlet> <servlet-mapping> <servlet-name>fileupload</servlet-name> <url-pattern>/servlet/fileupload</url-pattern>
首先运行html，servlet处理上传请求
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持硕编程。
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