剛剛學了下Struts2，做個文件上傳的小東西
以做一個文件上傳的例子展開
要想用Struts2，首先下個Struts2.0的包
http://people.apache.org/builds/struts/
這里版本可是真不少的，我下的2.1.2的包
也就是struts-2.1.2-all.zip 這頭東西
下完了就可以開始配置運行環境了

新建一個WebProject，名字就叫myStruts2好了
要正常啟動能運行Struts2最少需要5個Struts2包里lib目錄下的5個文件
分別是：
commons-logging-1.0.4.jar
freemarker-2.3.12.jar
ognl-2.6.11.jar
struts2-core-2.1.2.jar
xwork-2.1.1.jar
為了做下面這個例子，還需要拷貝
commons-io-1.3.2.jar
commons-fileupload-1.2.1.jar

這7個文件copy到項目webroot下的WEB-INF下的lib目錄下就行了

準備工作完畢。開工，做這個文件上傳的例子
首先配置WEB-INF下的web.xml文件如下：

?1 <? xml?version="1.0"?encoding="UTF-8" ?>
?2 < web-app? version ="2.4" ?xmlns ="http://java.sun.com/xml/ns/j2ee"
?3 ????xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"
?4 ????xsi:schemaLocation ="http://java.sun.com/xml/ns/j2ee?
 ?5 ????http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >
?6
?7 ???? < filter >
?8 ???????? < filter-name > struts2 </ filter-name >
?9 ???????? < filter-class >
10 ????????????org.apache.struts2.dispatcher.FilterDispatcher
 11 ???????? </ filter-class >
12 ???? </ filter >
13 ???? < filter-mapping >
14 ???????? < filter-name > struts2 </ filter-name >
15 ???????? < url-pattern > /* </ url-pattern >
16 ???? </ filter-mapping >
17
18 ???? < welcome-file-list >
19 ???????? < welcome-file > index.jsp </ welcome-file >
20 ???? </ welcome-file-list >
21
22 </ web-app >
23

然后修改下index.jsp文件，做一個文件上傳的頁面

?1 <% @?page?language = " java " ?pageEncoding = " UTF-8 " %>
?2 <% @?taglib?prefix = " s " ?uri = " /struts-tags " %>
?3
?4 <! DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN" >
?5 < html >
?6 ?? < head >
?7 ????
 ?8 ???? < title > My?JSP?'index.jsp'?starting?page </ title >
?9 ???? < meta? http-equiv ="pragma" ?content ="no-cache" >
10 ???? < meta? http-equiv ="cache-control" ?content ="no-cache" >
11 ???? < meta? http-equiv ="expires" ?content ="0" > ????
 12 ???? < meta? http-equiv ="keywords" ?content ="keyword1,keyword2,keyword3" >
13 ???? < meta? http-equiv ="description" ?content ="This?is?my?page" >
14 ???? <!--
15 ????<link?rel="stylesheet"?type="text/css"?href="styles.css">
 16 ???? -->
17 ?? </ head >
18 ??
 19 ?? < body >
20 ???? < s:form? action ="upload" ??method ="post" ?enctype ="multipart/form-data" >
21 ???? < s:file? name ="pic" ?label ="請選擇文件" ></ s:file >
22 ???? < s:submit? value ="提交" ></ s:submit >
23 ???? </ s:form >< br >
24 ?? </ body >
25 </ html >
26


做好這里，然后在src目錄下創建struts.xml文件

?1 <? xml?version="1.0"?encoding="UTF-8" ?>
?2 <! DOCTYPE?struts?PUBLIC
 ?3 ????"-//Apache?Software?Foundation//DTD?Struts?Configuration?2.0//EN"
 ?4 ????"http://struts.apache.org/dtds/struts-2.0.dtd" >
?5 < struts >
?6 ???? < constant? name ="struts.devMode" ?value ="true" ? />
?7 ????
 ?8 ???? < package? name ="default" ?extends ="struts-default" >
?9 ???????? < action? name ="upload" ?class ="com.home.jiangfan.Upload" >
10 ???????? < interceptor-ref? name ="timer" ></ interceptor-ref >
11 ???????? < interceptor-ref? name ="defaultStack" ></ interceptor-ref >
12 ???????? < result? name ="success" > /result.jsp </ result >
13 ???????? </ action >
14 ???? </ package >
15
16
17 ????
 18 </ struts >
19
20


接著創建Upload.java文件，在src里我新建了com.home.jiangfan的包，文件在這個包里
?1package?com.home.jiangfan;
?2
?3import?java.io.*;
?4import?java.util.*;
?5
?6import?org.apache.struts2.interceptor.ParameterAware;
?7
?8public?class?Upload?implements?ParameterAware{
?9????Map?parameters;
10????File?pic;
11????String?picContentType;
12????String?picFileName;
13????public?File?getPic()?{
14????????return?pic;
15????}
16????public?void?setPic(File?pic)?{
17????????this.pic?=?pic;
18????}
19????public?String?getPicContentType()?{
20????????return?picContentType;
21????}
22????public?void?setPicContentType(String?picContentType)?{
23????????this.picContentType?=?picContentType;
24????}
25????public?String?getPicFileName()?{
26????????return?picFileName;
27????}
28????public?void?setPicFileName(String?picFileName)?{
29????????this.picFileName?=?picFileName;
30????}
31????
32????public?String?execute(){
33????????String?path="D:"+File.separator+"copytest"+File.separator;
34????????path=path+picFileName;
35????????File?des=new?File(path);
36????????if(des.exists()){
37????????????des.delete();
38????????}
39????????pic.renameTo(des);
40????????
41????????return?"success";
42????}
43????
44????public?void?setParameters(Map?arg0)?{
45????????//?TODO?Auto-generated?method?stub
46????????parameters=arg0;
47????}
48
49}
50

好了，然后做一個返回的result頁面
?1<%@?page?language="java"?pageEncoding="UTF-8"%>
?2<%@?taglib?prefix="s"?uri="/struts-tags"%>
?3
?4<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">
?5<html>
?6??<head>
?7????
?8????<title>My?JSP?'index.jsp'?starting?page</title>
?9????<meta?http-equiv="pragma"?content="no-cache">
10????<meta?http-equiv="cache-control"?content="no-cache">
11????<meta?http-equiv="expires"?content="0">????
12????<meta?http-equiv="keywords"?content="keyword1,keyword2,keyword3">
13????<meta?http-equiv="description"?content="This?is?my?page">
14????<!--
15????<link?rel="stylesheet"?type="text/css"?href="styles.css">
16????-->
17??</head>
18??
19??<body>
20??文件名<s:property?value="picFileName"/>
21??文件類型<s:property?value="picContentType"/>
22??</body>
23</html>
24

其中為了修改文件上傳里，文件size的限制，需要在src目錄下添加一個struts.properties文件：
struts.multipart.maxSize=1024000000

這里我設置的大小是1G(這個總夠了吧！)
配合這個使用的方式，還需要在struts.xml里的Action標簽中間添加一段：
<interceptor-ref name="defaultStack">
??<param name="fileUpload.maximumSize">1024000000</param>
??</interceptor-ref>

實際上是修改fileUpload這個攔截器中的maximumSize參數值
搞定~~

睡覺~~了~~