实验5 Struts2 - 文件上传与下载一、简介 1、内容：用Struts2实现单个文件和多个文件的上传以及文件下载。二、步骤 1、准备 wget http://labfile.oss.aliyuncs.com/courses/32/m2.zip unzip m2.zip mv .m2 /home/shiyanlou/ 2、单文件上传 2.1 新建项目 mvn archetype:generate -DgroupId=shiyanlou.struts -DartifactId=FileUpload -DarchetypeArtifactId=maven-archetype-webapp 2.2 修改pom.xml： 4.0.0 shiyanlou.struts FileUpload war 1.0-SNAPSHOT FileUpload Maven Webapp org.apache.struts struts2-core 2.5.18 javax.servlet javax.servlet-api 4.0.1 provided FileUpload org.eclipse.jetty jetty-maven-plugin 9.4.12.v20180830 10 / 2.3 UploadAction.java package shiyanlou.struts; 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; public class UploadAction extends ActionSupport { private static final long serialVersionUID = 1L; // 上传文件者 private String uploader; // 上传的文件 private File upload; // 上传文件类型 private String uploadContentType; // 上传文件的文件名 private String uploadFileName; // 上传文件的保存路径 private String savePath; public String execute() throws Exception{ // 设置上传文件保存路径 String realpath = getSavePath(); // 判断上传文件是否为空 if (upload != null) { // 根据路径以及文件名，新建一个File文件实例 File savefile = new File(realpath, getUploadFileName()); // 判断此路径是否已经存在 if ( !savefile.getParentFile().exists() ) savefile.getParentFile().mkdirs(); // 把上传文件拷贝到新路径下，完成上传 FileUtils.copyFile(upload, savefile); // 设置request对象值，表示上传成功 ActionContext.getContext().put("message", "upload succeed!"); return "success"; } // 其他情况，上传失败 return "error"; } public String getUploader() { return uploader; } public void setUploader(String uploader) { this.uploader = uploader; } 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; } } 2.4 配置struts.xml：src/main/resources中新建struts.xml

/index.jsp /uploadFiles /success.jsp /error.jsp

2.5 编写JSP页面 1）index.jsp <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> Upload Your File 2）success.jsp <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib uri="/struts-tags" prefix="s"%> File Uploaded <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> upload succeed!
uploader:
file name:
file type:
file address:

<%=basePath %>

3）error.jsp <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> Upload Error No File selected! 2.6 配置web.xml文件

FileUpload

struts2

org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter

struts2

index.html

index.htm

index.jsp

default.html

default.htm

default.jsp

2.7 运行测试 mvn jetty:run 运行结果错误及解决： ![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid239255-20190525-1558785567615) git clone https://github.com/DamengLiu/cloud_for_myself.git 运行成功： ![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid239255-20190530-1559212420544) ![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid239255-20190530-1559212426570) 3、多文件上传 3.1 MultiUploadAction.java package shiyanlou.struts; 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; public class MultiUploadAction extends ActionSupport { private static final long serialVersionUID = 1L; private File[] uploads; private String[] uploadsContentType; private String[] uploadsFileName; private String savePath; public String execute() throws Exception { String realpath = getSavePath(); if (uploads != null) { File savepath = new File(realpath); if (!savepath.exists()) savepath.mkdirs(); for (int i = 0; i < uploads.length; i++) { File savefile = new File(savepath, getUploadsFileName()[i]); FileUtils.copyFile(uploads[i], savefile); } ActionContext.getContext().put("message", "upload succeed!"); return "success"; } return "error"; } public File[] getUploads() { return uploads; } public void setUploads(File[] uploads) { this.uploads = uploads; } public String[] getUploadsContentType() { return uploadsContentType; } public void setUploadsContentType(String[] uploadsContentType) { this.uploadsContentType = uploadsContentType; } public String[] getUploadsFileName() { return uploadsFileName; } public void setUploadsFileName(String[] uploadsFileName) { this.uploadsFileName = uploadsFileName; } public String getSavePath() { return ServletActionContext.getServletContext().getRealPath(savePath); } public void setSavePath(String savePath) { this.savePath = savePath; } } 3.2 struts.xml

/index.jsp

text/plain,image/png,image/gif,image/jpeg 20480

/uploadMultiFiles /success.jsp /error.jsp /index.jsp

3.3 JSP代码 3.3.1 index.jsp 主要是上传动作的完成 <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib uri="/struts-tags" prefix="s"%> Upload Your File 3.3.2 success.jsp <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %>

upload succeed!

file name:
file type:
file address:

<%=basePath %>

file name:
file type:
file address:

<%=basePath %>

file name:
file type:
file address:

<%=basePath %>

3.4 运行测试：mvn jetty:run 多文件运行成功： ![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid239255-20190531-1559267486493) ![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid239255-20190531-1559267493365) 4、文件下载 4.1 新增DownloadAction.java package shiyanlou.struts; import java.io.FileNotFoundException; import java.io.InputStream; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; public class DownloadAction extends ActionSupport { /** * */ private static final long serialVersionUID = 1L; // 下载路径 private String downloadPath; // 下载文件的文件名 private String filename; public String getFilename() { return filename; } public void setFilename(String filename) { this.filename = filename; } public void setDownloadPath(String downloadPath){ this.downloadPath = downloadPath; } public InputStream getTargetFile() throws FileNotFoundException { // 获得下载文件的真实路径 String realPath = downloadPath + "/" + getFilename(); // 返回下载文件对应的输入流 return ServletActionContext.getServletContext().getResourceAsStream(realPath); } public String execute() { return "success"; } } 4.2 修改struts.xml文件：上传文件配置不变，添加下载对应Action

/index.jsp

text/plain,image/png,image/gif,image/jpeg 20480

/uploadMultiFiles /success.jsp /error.jsp /index.jsp

/uploadMultiFiles targetFile attachment;filename=${filename} 4096 4.3 修改JSP页面下载添加成功，响应download失败： ![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid239255-20190531-1559267833259) 解决方案：切换工作空间到FileUpload。

“Struts框架教程”实验报告