sruts2：单个文件上传，多个文件上传（属性驱动）
文件上传功能在Struts2中得到了很好的封装，主要使用fileUpload上传组件。
1. 单个文件上传
1.1 创建上传单个文件的JSP页面、显示提交结果的JSP页面
uploadTest1.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ page isELIgnored="false"%> <%@ taglib uri="/struts-tags" prefix="s"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body> <s:form action="uploadT1" method="post" enctype="multipart/form-data"> <s:file name="uploadFile"></s:file> <br /> <s:submit value="提交"></s:submit> </s:form> </body> </html>
注意：代码中加入了enctype="multipart/form-data"；而且使用了<s:file/>标签，尤其注意<s:file/>的name属性。
showResult1.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ page isELIgnored="false"%> <%@ taglib uri="/struts-tags" prefix="s"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <body> 您上传的文件名为：<s:property value="uploadFileFileName" />，存放目录：<s:property value="#request.storeDir"/> <br /> <br/> <!--下载上下文路径--> <s:a href="%{#request.get('javax.servlet.forward.context_path')}/upload/%{uploadFileFileName}">点击这里下载</s:a> <br /> </body> </html>
1.2 生成Action类
package com.clzhang.struts2.demo12; import java.io.File; import java.io.IOException; import org.apache.commons.io.FileUtils; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; public class UploadTest1Action extends ActionSupport { public static final long serialVersionUID = 1; private File uploadFile; private String uploadFileFileName; public File getUploadFile() { return uploadFile; } public void setUploadFile(File uploadFile) { this.uploadFile = uploadFile; } public String getUploadFileFileName() { return uploadFileFileName; } public void setUploadFileFileName(String uploadFileFileName) { this.uploadFileFileName = uploadFileFileName; } public String execute() throws IOException { // 上传物理路径 String targetDirectory = ServletActionContext.getServletContext().getRealPath("/upload"); // 生成上传的File对象 File target = new File(targetDirectory, uploadFileFileName); // 复制File对象，从而实现上传文件 FileUtils.copyFile(uploadFile, target); ServletActionContext.getRequest().setAttribute("storeDir", targetDirectory); return SUCCESS; } }
Action实例中File变量命名规则：
- 数据类型为File的变量uploadFile和JSP页面中的<s:file/>标签的name属性值要一致，这样才可以使用Struts2的拦截器进行属性值的自动封装。
- Action实例中有uploadFileFileName变量，对应于上传文件的文件名，它的命名规则就是File的变量名后加FileName。
1.3 设置上传文件相关参数（struts.properties）
struts.multipart.maxSize=2048000000 struts.multipart.saveDir=/upload
通常此文件存放于WEB-INF\classes目录下。
1.4 修改struts.xml文件
<action name="uploadT1" class="com.clzhang.struts2.demo12.UploadTest1Action"> <result>/struts2/demo12/showResult1.jsp</result> </action>
1.5 测试
打开IE，输入地址：http://127.0.0.1:8080/st/struts2/demo12/uploadTest1.jsp
结果如下：
选择任意一个文件提交后，结果如下：
一个，显示了服务器物理存储地址；二个，提供了下载链接。
2. 多个文件上传（属性驱动）
Struts2支持多文件批量上传，将上面的代码中的File类型改成File[]即可。
2.1 创建上传多个文件的JSP页面、显示提交结果的JSP页面
uploadTest2.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ page isELIgnored="false"%> <%@ taglib uri="/struts-tags" prefix="s"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body> <s:form action="uploadT2" method="post" enctype="multipart/form-data"> username:<s:textfield name="fileUploadTools.username"></s:textfield> <br /> <s:file name="fileUploadTools.uploadFile"></s:file> <br /> <s:file name="fileUploadTools.uploadFile"></s:file> <br /> <s:file name="fileUploadTools.uploadFile"></s:file> <br /> <s:submit value="提交"></s:submit> </s:form> </body> </html>
注意：因为是属性驱动，所以表单元素的命名需要以fileUploadTools打头。
showResult2.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ page isELIgnored="false"%> <%@ taglib uri="/struts-tags" prefix="s"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <body> 您上传的文件名列表： <br/> <!--对Action中对象（fileUploadTools）包含的数组（uploadFileFileName）的遍历--> <s:iterator value="fileUploadTools.uploadFileFileName" status="st"> <s:iterator value="fileUploadTools.uploadFileFileName[#st.index]"> <s:property /> <br/> </s:iterator> </s:iterator> <br /> </body> </html>
2.2 生成Action类及属性驱动类
UploadTest2Action.java
package com.clzhang.struts2.demo12; import java.io.IOException; import com.opensymphony.xwork2.ActionSupport; public class UploadTest2Action extends ActionSupport { public static final long serialVersionUID = 1; // 声明封装了File上传的FileUploadTools类的实例 // FileUploadTools类也封装了上传的属性及get和set方法 private FileUploadTools fileUploadTools = new FileUploadTools(); public FileUploadTools getFileUploadTools() { return fileUploadTools; } public void setFileUploadTools(FileUploadTools fileUploadTools) { this.fileUploadTools = fileUploadTools; } @Override public String execute() throws IOException { fileUploadTools.beginUpload(); return SUCCESS; } }
FileUploadTools.java
package com.clzhang.struts2.demo12; import java.io.File; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import org.apache.commons.io.FileUtils; import org.apache.struts2.ServletActionContext; public class FileUploadTools { private String username; private File uploadFile[];// 上传的文件是数组类型 private String uploadFileFileName[];// 文件名是数组类型 private String uploadFileContentType[]; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } // 上传的ContentType文件类型也是数组类型 // 必须要加上对ContentType的声明，否则会出现异常 public String[] getUploadFileContentType() { return uploadFileContentType; } public void setUploadFileContentType(String[] uploadFileContentType) { this.uploadFileContentType = uploadFileContentType; } public File[] getUploadFile() { return uploadFile; } public void setUploadFile(File[] uploadFile) { this.uploadFile = uploadFile; } public String[] getUploadFileFileName() { return uploadFileFileName; } public void setUploadFileFileName(String[] uploadFileFileName) { this.uploadFileFileName = uploadFileFileName; } public String beginUpload() throws IOException { System.out.println("用户名：" + username); String targetDirectory = ServletActionContext.getServletContext().getRealPath("/upload"); for (int i = 0; i < uploadFile.length; i++) { File target = new File(targetDirectory, new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss") .format(new Date()).toString() + System.nanoTime() + uploadFileFileName[i]); FileUtils.copyFile(uploadFile[i], target); } return "success"; } }
2.3 设置上传文件相关参数（struts.properties），同上
2.4 修改struts.xml文件
<action name="uploadT2" class="com.clzhang.struts2.demo12.UploadTest2Action"> <result>/struts2/demo12/showResult2.jsp</result> </action>
2.5 测试
打开IE，输入地址：http://127.0.0.1:8080/st/struts2/demo12/uploadTest2.jsp
结果如下：
任意选择三个文件后，提交，结果如下：
