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struts2上传图片
在WEB-INF下新建一个content目录，建立一个upload.jsp
1 <%@ page contentType="text/html; charset=UTF-8" language="java" errorPage="" %> 2 <%@taglib prefix="s" uri="/struts-tags"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 4 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 5 <html xmlns="http://www.w3.org/1999/xhtml"> 6 <head> 7 <title>简单的文件上传</title> 8 </head> 9 <body>10 <s:form action="uploadPro" method="post"11 enctype="multipart/form-data">12 <s:textfield name="title" label="文件标题"/><br />13 <s:file name="upload" label="选择文件"/><br />14 <s:submit value="http://www.mamicode.com/上传"/>15 </s:form>16 </body>17 </html>
然后UploadAction.java如下
package action;import com.opensymphony.xwork2.Action;import com.opensymphony.xwork2.ActionSupport;import org.apache.struts2.ServletActionContext;import java.io.File;import java.io.*;public class UploadAction extends ActionSupport{ private String title; private File upload; private String uploadContentType; private String uploadFileName; private String savePath; public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public File getUpload() { return upload; } public void setUpload(File upload) { this.upload = upload; } public String getUploadContentType() { return uploadContentType; } public void setUploadContentType(String uploadContentType) { this.uploadContentType = uploadContentType; } public String getUploadFileName() { return uploadFileName; } public void setUploadFileName(String uploadFileName) { this.uploadFileName = uploadFileName; } public String getSavePath() { return ServletActionContext.getServletContext().getRealPath(savePath); } public void setSavePath(String savePath) { this.savePath = savePath; } @Override public String execute() throws Exception{ FileOutputStream fos = new FileOutputStream(getSavePath()+"//"+getUploadFileName()); FileInputStream fis = new FileInputStream(getUpload()); byte[] buffer = new byte[1024]; int len = 0; while((len = fis.read(buffer)) > 0){ fos.write(buffer, 0 , len); } fis.close(); fos.close(); return SUCCESS; }}在struts2中，如果表单中包含一个name属性为xxx的文件域，则对应action需要使用三个属性来封装该文件域的信息。
1.类型为File的xxx属性封装了该文件域对应的文件内容。
2.类型为String的xxxFileName属性封装了该文件域对应的文件的文件名。
3.类型为String的xxxContentType属性封装了该文件域对应的文件的文件类型。
上面例子struts2直接将文件域包含的上传文件名和文件类型的信息封装到uploadFileName和uploadContentType属性中。
下面是sruts.xml配置
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN" "http://struts.apache.org/dtds/struts-2.1.7.dtd"> <struts> <constant name="struts.custom.i18n.resources" value="http://www.mamicode.com/mess"/> <!-- 设置该应用使用的解码集 --> <constant name="struts.i18n.encoding" value="http://www.mamicode.com/GBK"/> <package name="lee" extends="struts-default"> <!-- 配置处理文件上传的Action --> <action name="uploadPro" class="action.UploadAction"> <!-- 动态设置Action的属性值 --> <param name="savePath">/upload</param> <!-- 配置Struts 2默认的视图页面 --> <result>/WEB-INF/content/succ.jsp</result> </action> <action name="*"> <result>/WEB-INF/content/{1}.jsp</result> </action> </package></struts>然后是web.xml
<?xml version="1.0" encoding="UTF-8"?><web-app version="3.0" 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_3_0.xsd"> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <!-- 让Struts 2的核心Filter拦截所有请求 --> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping></web-app>
succ.jsp:
<%@ page contentType="text/html; charset=UTF-8" language="java" errorPage="" %><%@taglib prefix="s" uri="/struts-tags"%><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head> <title>上传成功</title></head><body> 上传成功!<br/> 文件标题:<s:property value="http://www.mamicode.com/+ title"/><br/> 文件为：<img src="http://www.mamicode.com/
如图
struts2上传图片
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