通过2种方式模拟单个文件上传，效果如下所示
开发步骤如下：
1、新建一个web工程，导入struts2上传文件所需jar，如下图
目录结构
2、新建Action
第一种方式
package com.ljq.action; import java.io.File; import org.apache.commons.io.FileUtils; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; @SuppressWarnings("serial") public class UploadAction extends ActionSupport{ private File image; //上传的文件 private String imageFileName; //文件名称 private String imageContentType; //文件类型 public String execute() throws Exception { String realpath = ServletActionContext.getServletContext().getRealPath("/images"); //D:\apache-tomcat-6.0.18\webapps\struts2_upload\images System.out.println("realpath: "+realpath); if (image != null) { File savefile = new File(new File(realpath), imageFileName); if (!savefile.getParentFile().exists()) savefile.getParentFile().mkdirs(); FileUtils.copyFile(image, savefile); ActionContext.getContext().put("message", "文件上传成功"); } return "success"; } public File getImage() { return image; } public void setImage(File image) { this.image = image; } public String getImageFileName() { return imageFileName; } public void setImageFileName(String imageFileName) { this.imageFileName = imageFileName; } public String getImageContentType() { return imageContentType; } public void setImageContentType(String imageContentType) { this.imageContentType = imageContentType; } }
第二种方式
package com.ljq.action; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; @SuppressWarnings("serial") public class UploadAction2 extends ActionSupport { // 封装上传文件域的属性 private File image; // 封装上传文件类型的属性 private String imageContentType; // 封装上传文件名的属性 private String imageFileName; // 接受依赖注入的属性 private String savePath; @Override public String execute() { FileOutputStream fos = null; FileInputStream fis = null; try { // 建立文件输出流 System.out.println(getSavePath()); fos = new FileOutputStream(getSavePath() + "\\" + getImageFileName()); // 建立文件上传流 fis = new FileInputStream(getImage()); byte[] buffer = new byte[1024]; int len = 0; while ((len = fis.read(buffer)) > 0) { fos.write(buffer, 0, len); } } catch (Exception e) { System.out.println("文件上传失败"); e.printStackTrace(); } finally { close(fos, fis); } return SUCCESS; } /** * 返回上传文件的保存位置 * * @return */ public String getSavePath() throws Exception{ return ServletActionContext.getServletContext().getRealPath(savePath); } public void setSavePath(String savePath) { this.savePath = savePath; } public File getImage() { return image; } public void setImage(File image) { this.image = image; } public String getImageContentType() { return imageContentType; } public void setImageContentType(String imageContentType) { this.imageContentType = imageContentType; } public String getImageFileName() { return imageFileName; } public void setImageFileName(String imageFileName) { this.imageFileName = imageFileName; } private void close(FileOutputStream fos, FileInputStream fis) { if (fis != null) { try { fis.close(); } catch (IOException e) { System.out.println("FileInputStream关闭失败"); e.printStackTrace(); } } if (fos != null) { try { fos.close(); } catch (IOException e) { System.out.println("FileOutputStream关闭失败"); e.printStackTrace(); } } } }
web.xml文件
<?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">
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>uploads</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>uploads</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
struts.xml配置文件
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <!-- 该属性指定需要Struts2处理的请求后缀，该属性的默认值是action，即所有匹配*.action的请求都由Struts2处理。 如果用户需要指定多个请求后缀，则多个后缀之间以英文逗号（,）隔开。 --> <constant name="struts.action.extension" value="do" /> <!-- 设置浏览器是否缓存静态内容,默认值为true(生产环境下使用),开发阶段最好关闭 --> <constant name="struts.serve.static.browserCache" value="false" /> <!-- 当struts的配置文件修改后,系统是否自动重新加载该文件,默认值为false(生产环境下使用),开发阶段最好打开 --> <constant name="struts.configuration.xml.reload" value="true" /> <!-- 开发模式下使用,这样可以打印出更详细的错误信息 --> <constant name="struts.devMode" value="true" /> <!-- 默认的视图主题 --> <constant name="struts.ui.theme" value="simple" /> <!--<constant name="struts.objectFactory" value="spring" />--> <!--解决乱码 --> <constant name="struts.i18n.encoding" value="UTF-8" /> <!-- 指定允许上传的文件最大字节数。默认值是2097152(2M) --> <constant name="struts.multipart.maxSize" value="10701096"/> <!-- 设置上传文件的临时文件夹,默认使用javax.servlet.context.tempdir --> <constant name="struts.multipart.saveDir " value="d:/tmp" /> <package name="upload" namespace="/upload" extends="struts-default"> <action name="*_upload" class="com.ljq.action.UploadAction" method="{1}"> <result name="success">/WEB-INF/page/message.jsp</result> </action> </package> <package name="upload2" extends="struts-default"> <action name="upload2" class="com.ljq.action.UploadAction2" method="execute"> <!-- 动态设置savePath的属性值 --> <param name="savePath">/images</param> <result name="success">/WEB-INF/page/message.jsp</result> <result name="input">/upload/upload.jsp</result> <interceptor-ref name="fileUpload"> <!-- 文件过滤 --> <param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg</param> <!-- 文件大小, 以字节为单位 --> <param name="maximumSize">1025956</param> </interceptor-ref> <!-- 默认拦截器必须放在fileUpload之后，否则无效 --> <interceptor-ref name="defaultStack" /> </action> </package> </struts>
上传表单页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@taglib uri="/struts-tags" prefix="s" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>文件上传</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> </head> <body> <!-- ${pageContext.request.contextPath}/upload/execute_upload.do --> <!-- ${pageContext.request.contextPath}/upload2/upload2.do --> <form action="${pageContext.request.contextPath}/upload2/upload2.do" enctype="multipart/form-data" method="post"> 文件:<input type="file" name="image"> <input type="submit" value="上传" /> </form> <br/> <s:fielderror /> </body> </html>
显示结果页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib uri="/struts-tags" prefix="s"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>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"> </head> <body> 上传成功！ <br/><br/> <!-- ${pageContext.request.contextPath} tomcat部署路径， 如：D:\apache-tomcat-6.0.18\webapps\struts2_upload\ --> <img src="${pageContext.request.contextPath}/<s:property value="'images/'+imageFileName"/>"> <s:debug></s:debug> </body> </html>