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一、所需要的包：
1、commons-fileupload-1.2.1.jar：
下载地址
2、commons-io-1.4.jar：
下载地址
二、注意事项：
form表单里面要加上enctype="multipart/form-data"
三、代码示例
1、jsp代码：
<%@ page language="java" contenttype="text/html; charset=utf-8" pageencoding="utf-8"%> <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <title>upload</title> </head> <body> <form action="uploadservlet" method="post" enctype="multipart/form-data"> <table> <caption>上传实例</caption> <tr> <td>姓名</td> <td> <input type="text" name="name"> </td> </tr> <tr> <td>年龄</td> <td> <input type="text" name="age"> </td> </tr> <tr> <td>照片</td> <td> <input type="file" name="image"> </td> </tr> <tr> <td></td> <td> <input type="submit" value="提交"> </td> </tr> </table> </form> </body> </html>
2、uploadservlet代码
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package servlet;
import java.io.bufferedinputstream;
import java.io.bufferedoutputstream;
import java.io.file;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.io.writer;
import java.util.iterator;
import java.util.list;
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.fileuploadbase.sizelimitexceededexception;
import org.apache.commons.fileupload.disk.diskfileitemfactory;
import org.apache.commons.fileupload.servlet.servletfileupload;
import org.apache.commons.fileupload.util.streams;
/**
* 上传servlet
* @author lisanlai
*
*/
public class uploadservlet extends httpservlet {
private static final long serialversionuid = 1l;
public uploadservlet() {
super();
}
protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
this.dopost(request, response);
}
@suppresswarnings("unchecked")
protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
response.setcontenttype("text/html");
// 设置字符编码为utf-8, 这样支持汉字显示
response.setcharacterencoding("utf-8");
writer o = response.getwriter();
/**
* 首先判断form的enctype是不是multipart/form-data
* 同时也判断了form的提交方式是不是post
* 方法：ismultipartcontent(request)
*/
if(servletfileupload.ismultipartcontent(request)){
request.setcharacterencoding("utf-8");
// 实例化一个硬盘文件工厂,用来配置上传组件servletfileupload
diskfileitemfactory factory = new diskfileitemfactory();
//设置文件存放的临时文件夹，这个文件夹要真实存在
file filedir = new file("../webapps/fileupload/tmp/");
if(filedir.isdirectory() && filedir.exists()==false){
filedir.mkdir();
}
factory.setrepository(filedir);
//设置最大占用的内存
factory.setsizethreshold(1024000);
//创建servletfileupload对象
servletfileupload sfu = new servletfileupload(factory);
sfu.setheaderencoding("utf-8");
//设置单个文件最大值byte
sfu.setfilesizemax(102400000);
//所有上传文件的总和最大值byte
sfu.setsizemax(204800000);
list<fileitem> items = null;
try {
items = sfu.parserequest(request);
}catch (sizelimitexceededexception e) {
system.out.println("文件大小超过了最大值");
} catch(fileuploadexception e) {
e.printstacktrace();
}
//取得items的迭代器
iterator<fileitem> iter = items==null?null:items.iterator();
//图片上传后存放的路径目录
file images = new file("d:/upload/images/");
if(images.exists()==false){
images.mkdirs();
}
//迭代items
while(iter!=null && iter.hasnext()){
fileitem item = (fileitem) iter.next();
//如果传过来的是普通的表单域
if(item.isformfield()){
system.out.print("普通的表单域:");
system.out.print(new string(item.getfieldname()) + " ");
system.out.println(new string(item.getstring("utf-8")));
}
//文件域
else if(!item.isformfield()){
system.out.println("源图片:" + item.getname());
string filename = item.getname().substring(item.getname().lastindexof("\\"));
bufferedinputstream in = new bufferedinputstream(item.getinputstream());
//文件存储在d:/upload/images目录下,这个目录也得存在
bufferedoutputstream out = new bufferedoutputstream(
new fileoutputstream(new file(images.getabsolutepath()+ filename)));
streams.copy(in, out, true);
o.write("文件上传成功");
}
}
}else {
system.out.println("表单的enctype 类型错误");
}
}
}
3、web.xml
<?xml version="1.0" encoding="utf-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="webapp_id" version="2.5"> <display-name>uploadtest</display-name> <welcome-file-list> <welcome-file>upload.jsp</welcome-file> </welcome-file-list> <servlet> <description></description> <display-name>uploadservlet</display-name> <servlet-name>uploadservlet</servlet-name> <servlet-class>servlet.uploadservlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>uploadservlet</servlet-name> <url-pattern>/uploadservlet</url-pattern> </servlet-mapping> </web-app>
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