Struts2-上传/下载文件功能实现

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上传文件

项目：

（1）web.xml文件配置

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">  <display-name>Struts2-test-7-FileDown</display-name>  <filter>  <filter-name>Struts2-test-7-FileDown</filter-name>  <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>      </filter>    <filter-mapping>      <filter-name>Struts2-test-7-FileDown</filter-name>      <url-pattern>/*</url-pattern>  </filter-mapping></web-app>

（2）选择上传文件界面

FileUpload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>文件上传</title></head><body><form action="Upload.action" method="post" enctype="multipart/form-data">file:<input type="file" name="file"><br/><input type="submit" value="上传"></form></body></html>

（3）Action文件实现具体功能

UploadAction.java

/* *@Author swxctx *@time 2016年9月9日 */package com.sw.struts2;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.util.List;import org.apache.commons.fileupload.servlet.ServletRequestContext;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction2 extends ActionSupport {//实现多文件上传private String username;private List<File> file;//file需要与客户端所传文件名一致private List<String> fileFileName;//文件名private List<String> fileContType;//类型public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public List<File> getFile() {return file;}public void setFile(List<File> file) {this.file = file;}public List<String> getFileFileName() {return fileFileName;}public void setFileFileName(List<String> fileFileName) {this.fileFileName = fileFileName;}public List<String> getFileContType() {return fileContType;}public void setFileContType(List<String> fileContType) {this.fileContType = fileContType;}@Overridepublic String execute() throws Exception {// TODO Auto-generated method stubfor(int i=0;i<file.size();i++){InputStream is=new FileInputStream(file.get(i));String root=ServletActionContext.getRequest().getRealPath("/upload");File destFile=new File(root,fileFileName.get(i));OutputStream os=new FileOutputStream(destFile);byte[] buffer=new byte[400];int length=0;while((length=is.read(buffer))!=-1){os.write(buffer, 0, length);}is.close();os.close();}return "SUCCESS";}}

（4）结果页面

FileUploadResult.jap

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@taglib uri="/struts-tags" prefix="s"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>result</title></head><body>FileName:<s:property value="fileFileName"/><br/>Type:<s:property value="fileContentType"/><br/></body></html>

（5）struts.xml配置文件

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN""http://struts.apache.org/dtds/struts-2.3.dtd"><struts>    <!-- 指定文件上传大小 -->    <constant name="struts.multipart.maxSize" value="1048576000"></constant>    <package name="Struts2-test-7-FileDown" extends="struts-default">        <!-- action配置 -->        <action name="Upload" class="com.sw.file.UploadAction">            <result name="success">/FileUploadResult.jsp</result>        </action>    </package>    </struts>

上传文件实例截图：

下载文件

项目：

（1）web.xml配置文件

（如上配置，其使用同一项目）

（2）下载文件界面

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>文件下载</title></head><body><a href="downloadFile.action">下载文件</a></body></html>

（3）Action文件下载

DownloadAction.java：

/* *@Author swxctx *@time 2016年10月23日 */package com.sw.file;import java.io.InputStream;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class DownloadAction extends ActionSupport {//文件下载public InputStream getDownloadFile(){return ServletActionContext.getServletContext().getResourceAsStream("/upload/Upload.txt");}@Overridepublic String execute() throws Exception {// TODO Auto-generated method stubreturn "success";}}

（4）struts.xml配置文件

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN""http://struts.apache.org/dtds/struts-2.3.dtd"><struts>           <!-- 下载文件action配置 -->        <action name="downloadFile" class="com.sw.file.DownloadAction"><result type="stream" name="success"><param name="contentDisposition">attachment;filename="Upload.txt"</param><param name="inputName">downloadFile</param></result></action>    </package>    </struts>

下载文件实例截图：

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