apex:inputFile

1<!-- Upload a file and put it in your personal documents folder-->
2
3<!-- Page: -->
4<apex:page standardController="Document" extensions="documentExt">
5    <apex:messages />
6    <apex:form id="theForm">
7      <apex:pageBlock>
8          <apex:pageBlockSection>
9            <apex:inputFile value="{!document.body}" filename="{!document.name}"/>
10            <apex:commandButton value="Save" action="{!save}"/>
11          </apex:pageBlockSection>
12       </apex:pageBlock>
13    </apex:form>
14</apex:page>
15                
16/*** Controller ***/
17public class documentExt {
18    public documentExt(ApexPages.StandardController controller) {
19        Document d = (Document) controller.getRecord();
20        d.folderid = UserInfo.getUserId(); //this puts it in My Personal Documents
21    }                 
22}