struts2 图片上传到服务器并显示在页面

时间：2021-12-20 12:26:03

1、新建一个WEB项目。

2、导入struts2所用的jar。

struts2 图片上传到服务器并显示在页面

3、新建或复制struts2的配置文件（struts.xml）。

4、在web.xml文件中配置struts2功能。

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <filter>
  	<filter-name>strut2</filter-name>
  	<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>strut2</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

5、文件上传的页面。（indes.jsp）如下内容所示：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>  

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>Struts2 Common File Upload</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  <body>
  	<h3>Struts2 文件上传到服务器</h3>
  	<form action="fileUpload" method="post" enctype="multipart/form-data">
  		文件：<input type="file" name="fileImage"/>
  		<input type="submit" value="上传"/>
  	</form>
  	<s:fielderror/>
  </body>
</html>

6、填写配置struts.xml文件的action。 

<!DOCTYPE struts PUBLIC 
"-//Aoacge Siftware Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
	<!-- 解决乱码 -->
	<constant name="struts.i18n.encoding" value="UTF-8"></constant>
	<package name="com.upload.imageupload"  extends="struts-default"> 
		<action name="fileUpload" class="com.upload.imageupload.ImageFileUpload" method="execute">
			<result name="success">upload.jsp</result>
			<result name="error">error.jsp</result>
			 <!-- 动态设置savePath的属性值 -->
			 <!-- <param name="savePath">/images</param> -->
            <interceptor-ref name="fileUpload">
                <!-- 文件过滤 -->
                <param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg,image/jpg</param>
                <!-- 文件大小, 以字节为单位 -->
                <param name="maximumSize">1024*20</param>
            </interceptor-ref>
            <!-- 默认拦截器必须放在fileUpload之后，否则无效 -->
            <interceptor-ref name="defaultStack" />
            <result name="input">index.jsp</result>
		</action>
	</package>
</struts>
7、上传成功的页面。（upload.jsp） 

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>图片上传成功</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
  	图片上传成功！
  	<br></br>
  	<img src="${pageContext.request.contextPath}/<s:property value="'images/'+fileImageFileName"/>">
    <s:debug></s:debug>
  </body>
</html>

8、上传失败的页面。（error.jsp）

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>图片上传失败</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
   	图片上传失败！
  </body>
</html>

9、上传中文的图片。

在tomcat的server.xml中加入URIEncoding="utf-8" （网页的编码是utf-8）
    <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" disableUploadTimeout="true" URIEncoding="utf-8" redirectPort="8443" />

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