7、Struts2实现文件上传和下载
一、实现单个文件上传
1、创建如下web项目结构
2、在src下的com.action包下创建UploadAction.java
1 package com.action; 2 import java.io.File; 3 4 import javax.servlet.ServletContext; 5 6 import org.apache.commons.io.FileUtils; 7 import org.apache.struts2.ServletActionContext; 8 9 import com.opensymphony.xwork2.ActionSupport; 10 11 /** 12 * 单个文件上传 13 * @author Dell 14 * 15 */ 16 public class UploadAction extends ActionSupport { 17 //封装上传文件属性==form表单中file文件域的name属性值保持一致 18 private File upload; 19 20 //封装上传文件的类型，固定语法=file文件域name属性值+ContextType; 21 private String uploadContentType; 22 23 //封装文件上传名，固定语法=file文件域name属性值+FileName 24 private String uploadFileName; 25 26 27 @Override 28 public String execute() throws Exception { 29 //获取上下文对象 30 ServletContext appliaction=ServletActionContext.getServletContext(); 31 //获取要保存文件的位置 32 String path=appliaction.getRealPath("/upload"); 33 //创建一个与上传同名的文件 34 File file=new File(path,uploadFileName); 35 //将临时文件内容拷贝到目标文件夹下的那个同名的文件 36 FileUtils.copyFile(upload, file); 37 //删除临时文件 38 upload.delete(); 39 return SUCCESS; 40 } 41 42 public File getUpload() { 43 return upload; 44 } 45 public void setUpload(File upload) { 46 this.upload = upload; 47 } 48 public String getUploadContentType() { 49 return uploadContentType; 50 } 51 public void setUploadContentType(String uploadContentType) { 52 this.uploadContentType = uploadContentType; 53 } 54 public String getUploadFileName() { 55 return uploadFileName; 56 } 57 public void setUploadFileName(String uploadFileName) { 58 this.uploadFileName = uploadFileName; 59 } 60 61 62 }
3、在src下创建struts.xml文件
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "struts-2.1.dtd" > 3 <struts> 4 <!-- 中文乱码处理 --> 5 <constant name="struts.i18n.encoding" value="UTF-8"/> 6 7 <constant name="struts.devMode" value="true"/> 8 <!-- 设置上传文件的总大小 --> 9 <constant name="struts.multipart.maxSize" value="200000000"/> 10 11 <package name="default" namespace="/" extends="struts-default"> 12 <!--文件上传 --> 13 <action name="*" class="com.action.{1}Action" method="execute"> 14 <result>/success.jsp</result> 15 <result name="input">/error.jsp</result> 16 <interceptor-ref name="defaultStack"> 17 <!-- 配置文件上传的大小，这里配置的是上传文件的单个大小 --> 18 <param name="fileUpload.maximumSize">20971520</param> 19 20 <!-- 配置文件上传允许的类型 --> 21 <param name="fileUpload.allowedTypes">text/plain,application/msword</param> 22 23 <!-- 配置文件的扩展名 --> 24 <param name="fileUpload.allowedExtensions">.txt,.doc</param> 25 </interceptor-ref> 26 </action> 27 28 </package> 29 </struts>
4、在WebRoot下创建upload文件夹
5、编辑WebRoot下的WEB-INF下的web.xml文件
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> 3 <filter> 4 <filter-name>struts2</filter-name> 5 <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> 6 </filter> 7 8 <filter-mapping> 9 <filter-name>struts2</filter-name> 10 <url-pattern>/*</url-pattern> 11 </filter-mapping> 12 13 <welcome-file-list> 14 <welcome-file>upload.jsp</welcome-file> 15 </welcome-file-list> 16 17 </web-app>
6、在WebRoot下创建upload.jsp文件
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@ taglib uri= "/struts-tags" prefix="s" %> 3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %> 7 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 9 <html> 10 <head> 11 <base href="<%=basePath%>"> 12 13 <title>单个文件上传</title> 14 <meta http-equiv="pragma" content="no-cache"> 15 <meta http-equiv="cache-control" content="no-cache"> 16 <meta http-equiv="expires" content="0"> 17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 18 <meta http-equiv="description" content="This is my page"> 19 <!-- 20 <link rel="stylesheet" type="text/css" href="styles.css"> 21 --> 22 </head> 23 24 <body> 25 <s:form action="Upload.action" enctype="multipart/form-data" method="post"> 26 <s:textfield name="title" label="标题"/><br/> 27 <s:file name="upload" label="选择文件"/><br/> 28 <s:submit name="submit" value="上传文件"/> 29 </s:form> 30 </body> 31 </html>
7、在WebRoot下创建success.jsp文件
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@ taglib uri="/struts-tags" prefix="s" %> 3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %> 7 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 9 <html> 10 <head> 11 <base href="<%=basePath%>"> 12 13 <title>My JSP 'index.jsp' starting page</title> 14 <meta http-equiv="pragma" content="no-cache"> 15 <meta http-equiv="cache-control" content="no-cache"> 16 <meta http-equiv="expires" content="0"> 17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 18 <meta http-equiv="description" content="This is my page"> 19 <!-- 20 <link rel="stylesheet" type="text/css" href="styles.css"> 21 --> 22 </head> 23 24 <body> 25 上传成功！ 26 您所上传的文件是：<s:property value="uploadFileName"/><br/> 27 文件类型：<s:property value="uploadContentType"/><br/> 28 </body> 29 </html>
8、在WebRoot下创建error.jsp文件
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head> 10 <base href="<%=basePath%>"> 11 12 <title>My JSP 'MyJsp.jsp' starting page</title> 13 14 <meta http-equiv="pragma" content="no-cache"> 15 <meta http-equiv="cache-control" content="no-cache"> 16 <meta http-equiv="expires" content="0"> 17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 18 <meta http-equiv="description" content="This is my page"> 19 <!-- 20 <link rel="stylesheet" type="text/css" href="styles.css"> 21 --> 22 23 </head> 24 25 <body> 26 操作失败！！ 27 </body> 28 </html>
9、运行
二、上传多个文件
(接着上面的项目进行)
1、在src的com.action包下创建ManyUploadAction.java
1 package com.action; 2 import java.io.File; 3 4 import javax.servlet.ServletContext; 5 6 import org.apache.commons.io.FileUtils; 7 import org.apache.struts2.ServletActionContext; 8 9 import com.opensymphony.xwork2.ActionSupport; 10 11 /** 12 * 多个文件上传 13 * @author Dell 14 * 15 */ 16 public class ManyUploadAction extends ActionSupport { 17 //封装上传文件属性==form表单中file文件域的name属性值保持一致 18 private File[] upload; 19 20 //封装上传文件的类型，固定语法=file文件域name属性值+ContextType; 21 private String[] uploadContentType; 22 23 //封装文件上传名，固定语法=file文件域name属性值+FileName 24 private String[] uploadFileName; 25 26 27 @Override 28 public String execute() throws Exception { 29 //获取上下文对象 30 ServletContext appliaction=ServletActionContext.getServletContext(); 31 //获取要保存文件的位置 32 String path=appliaction.getRealPath("/upload"); 33 for (int i = 0; i < upload.length; i++) { 34 35 36 //创建一个与上传同名的文件 37 File file=new File(path,uploadFileName[i]); 38 //将临时文件内容拷贝到目标文件夹下的那个同名的文件 39 FileUtils.copyFile(upload[i], file); 40 //删除临时文件 41 upload[i].delete(); 42 } 43 return SUCCESS; 44 } 45 46 47 public File[] getUpload() { 48 return upload; 49 } 50 51 52 public void setUpload(File[] upload) { 53 this.upload = upload; 54 } 55 56 57 public String[] getUploadContentType() { 58 return uploadContentType; 59 } 60 61 62 public void setUploadContentType(String[] uploadContentType) { 63 this.uploadContentType = uploadContentType; 64 } 65 66 67 public String[] getUploadFileName() { 68 return uploadFileName; 69 } 70 71 72 public void setUploadFileName(String[] uploadFileName) { 73 this.uploadFileName = uploadFileName; 74 } 75 76 77 78 79 }
2、在WebRoot下创建manyUpload.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@ taglib uri= "/struts-tags" prefix="s" %> 3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %> 7 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 9 <html> 10 <head> 11 <base href="<%=basePath%>"> 12 13 <title>多个文件上传</title> 14 <meta http-equiv="pragma" content="no-cache"> 15 <meta http-equiv="cache-control" content="no-cache"> 16 <meta http-equiv="expires" content="0"> 17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 18 <meta http-equiv="description" content="This is my page"> 19 <!-- 20 <link rel="stylesheet" type="text/css" href="styles.css"> 21 --> 22 </head> 23 24 <body> 25 <s:form action="ManyUpload.action" enctype="multipart/form-data" method="post"> 26 <s:file name="upload" label="选择文件1"/><br/> 27 <s:file name="upload" label="选择文件2"/><br/> 28 <s:file name="upload" label="选择文件3"/><br/> 29 <s:file name="upload" label="选择文件4"/><br/> 30 <s:file name="upload" label="选择文件5"/><br/> 31 <s:submit name="submit" value="上传文件"/><br/> 32 </s:form> 33 </body> 34 </html>
3、运行
三、文件下载
(接着上面的项目进行)
1、在src下的com.action包下创建FileDownAction.java
1 package com.action; 2 3 import java.io.BufferedInputStream; 4 import java.io.FileInputStream; 5 import java.io.FileNotFoundException; 6 import java.io.InputStream; 7 8 import org.apache.struts2.ServletActionContext; 9 10 import com.opensymphony.xwork2.ActionSupport; 11 12 /** 13 * 文件下载 14 * @author Dell 15 * 16 */ 17 public class FileDownAction extends ActionSupport{ 18 //读取下载文件的目录 19 private String inputPath; 20 //下载文件的文件名 21 private String fileName; 22 //读取下载文件的输入流 23 private InputStream inputStream; 24 //下载文件的类型 25 private String contentType; 26 27 28 29 @Override 30 public String execute() throws Exception { 31 return SUCCESS; 32 } 33 34 public String getInputPath() { 35 return inputPath; 36 } 37 public void setInputPath(String inputPath) { 38 this.inputPath = inputPath; 39 } 40 public String getFileName() { 41 return fileName; 42 } 43 public void setFileName(String fileName) { 44 this.fileName = fileName; 45 } 46 //创建InputStream输入流 47 public InputStream getInputStream() throws FileNotFoundException { 48 //得到下载文件的实际路径 49 String path=ServletActionContext.getServletContext().getRealPath(inputPath); 50 //创建输入流实现文件的下载读取 51 return new BufferedInputStream(new FileInputStream(path+"\\"+fileName)); 52 } 53 public void setInputStream(InputStream inputStream) { 54 this.inputStream = inputStream; 55 } 56 public String getContentType() { 57 return contentType; 58 } 59 public void setContentType(String contentType) { 60 this.contentType = contentType; 61 } 62 63 }
2、编辑src下的struts.xml文件（添加文件下载的action的内容）
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN" "struts-2.1.7.dtd" > 3 <struts> 4 <!-- 中文乱码处理 --> 5 <constant name="struts.i18n.encoding" value="UTF-8"/> 6 7 <!-- 设置开发模式 --> 8 <constant name="struts.devMode" value="true"/> 9 10 <!-- 设置上传文件的大小 --> 11 <constant name="struts.multipart.maxSize" value="200000000"/> 12 13 <package name="default" namespace="/" extends="struts-default"> 14 <!-- 文件上传 --> 15 <action name="*" class="com.action.{1}Action" method="execute"> 16 <result>/success.jsp</result> 17 <result name="input">/error.jsp</result> 18 <!-- 引用默认拦截器栈 --> 19 <interceptor-ref name="defaultStack"> 20 <!-- 配置上传的大小，这里配置的是上传文件的单个大小 --> 21 <param name="fileUpload.maximumSize">20971520</param> 22 <!-- 配置文件上传允许的类型 --> 23 <!-- 图片：image/pjpeg,image/jpeg,image/gif,image/png,image/bmp --> 24 <!-- 文本文件：text/plain --> 25 <!-- HTML网页：text/html --> 26 <!-- 可执行文件：application/octet-stream --> 27 <!-- PPT:Application/vnd.ms-powerpoint --> 28 <!-- Excel：Application/vnd.ms-excel --> 29 <!-- Word：application/msword --> 30 <param name="fileUpload.allowedTypes">text/plain,application/msword</param> 31 <!-- 配置文件的扩展名 --> 32 <param name="fileUpload.allowedExtensions">.txt,.doc</param> 33 34 </interceptor-ref> 35 </action> 36 37 <!-- 文件下载 --> 38 <action name="download" class="com.action.FileDownAction" method="execute"> 39 <!-- 配置action中使用的参数--> 40 <param name="inputPath">/upload</param> 41 42 <result name="success" type="stream"> 43 <!--设置浏览器的文件类型 --> 44 <param name="contentType">application/octet-stream</param> 45 <!-- 输入流,读取 --> 46 <param name="inputStream">inputStream</param> 47 <!--设置http响应的头 --> 48 <param name="contentDisposition">attachment;filename="${fileName}"</param> 49 <!-- 设置缓冲区大小 --> 50 <param name="bufferSize">4096</param> 51 </result> 52 </action> 53 </package> 54 </struts> 55 56 57 58 59 60 61
3、在WebRoot下创建down.jsp页面
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@ taglib uri= "/struts-tags" prefix="s" %> 3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %> 7 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 9 <html> 10 <head> 11 <base href="<%=basePath%>"> 12 13 <title>文件下载</title> 14 <meta http-equiv="pragma" content="no-cache"> 15 <meta http-equiv="cache-control" content="no-cache"> 16 <meta http-equiv="expires" content="0"> 17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 18 <meta http-equiv="description" content="This is my page"> 19 <!-- 20 <link rel="stylesheet" type="text/css" href="styles.css"> 21 --> 22 </head> 23 24 <body> 25 <a href="download.action?fileName=20140914.txt">点击此处下载20140914.txt文档</a> 26 27 </body> 28 </html>
4、运行
