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struts2——上传图片格式

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <%@taglib uri="/struts-tags" prefix="s"%>
 4 <!DOCTYPE html>
 5 <html>
 6     <head>
 7         <meta charset="UTF-8">
 8         <title>struts2的一个例子</title>
 9     </head>
10     <body>
11         <s:form action="photo.action" method="post" enctype="multipart/form-data">
12             <s:textarea name="username" label="用户名"/>
13             <s:file name="photo" label="请选择上传图片"/>
14             <s:submit value="提交"/>
15         </s:form>
16         
17     </body>
18 </html>

index.jsp代码

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
 3   <filter>
 4     <filter-name>struts2</filter-name>
 5     <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
 6   </filter>
 7   <filter-mapping>
 8     <filter-name>struts2</filter-name>
 9     <url-pattern>/*</url-pattern>
10   </filter-mapping>
11   <display-name></display-name>
12   <welcome-file-list>
13     <welcome-file>index.jsp</welcome-file>
14   </welcome-file-list>
15 </web-app>

web.xml代码

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5 <struts>
 6     <constant name="struts.devMode" value="true"/>
 7     <package name="hello" extends="struts-default" namespace="/">
 8         <action name="photo" class="com.xiaostudy.web.UpPhoto" method="upPhoto">
 9             <interceptor-ref name="defaultStack">
10                 <param name="fileUpload.allowedExtensions">.jpeg,.jpg,.gif,.png</param>
11             </interceptor-ref>
12             <result name="success">/ok.jsp</result>
13             <result name="input">/err.jsp</result>
14         </action>
15     </package>
16 </struts>

struts.xml代码

 1 package com.xiaostudy.web;
 2 
 3 import java.io.File;
 4 
 5 import org.apache.struts2.ServletActionContext;
 6 
 7 import com.opensymphony.xwork2.ActionSupport;
 8 
 9 public class UpPhoto  extends ActionSupport {
10     
11     public String username;
12     public File photo;
13     public String photoFileName;
14     public String photoContentType;
15     
16     public String upPhoto() {
17         
18         String path = ServletActionContext.getServletContext().getRealPath("/WEB-INF/files");
19         File file2 = new File(path);
20         if(!file2.exists()) {
21             file2.mkdirs();
22             System.out.println("创建了文件夹》》》》》》");
23         }
24         File file3 = new File(file2, photoFileName);
25         photo.renameTo(file3);
26         
27         System.out.println(photo);
28         System.out.println(file2);
29         System.out.println(file3);
30         
31         
32         return SUCCESS;
33     }
34 
35     public String getUsername() {
36         return username;
37     }
38 
39     public void setUsername(String username) {
40         this.username = username;
41     }
42 
43     public File getPhoto() {
44         return photo;
45     }
46 
47     public void setPhoto(File photo) {
48         this.photo = photo;
49     }
50 
51     public String getPhotoFileName() {
52         return photoFileName;
53     }
54 
55     public void setPhotoFileName(String photoFileName) {
56         this.photoFileName = photoFileName;
57     }
58 
59     public String getPhotoContentType() {
60         return photoContentType;
61     }
62 
63     public void setPhotoContentType(String photoContentType) {
64         this.photoContentType = photoContentType;
65     }
66 }

action动作类UpPhoto

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5     <head>
 6         <meta charset="UTF-8">
 7         <title>struts2的一个例子</title>
 8     </head>
 9     <body>
10     okokokok
11     </body>
12 </html>

ok.jsp代码

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 不是照片格式
11 </body>
12 </html>

err.jsp代码

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原文地址：https://www.cnblogs.com/xiaostudy/p/9446471.html