struts 文件上传及文件下载

来源：互联网发布：helloworld代码java 编辑：程序博客网时间：2024/06/05 10:28

文件上传

UploadAction.java

package com.wansha.struts.action;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.util.HashMap;import java.util.List;import java.util.Map;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport{private String username;private List<File> file;private List<String> fileFileName;private List<String> fileContentType;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> getFileContentType() {return fileContentType;}public void setFileContentType(List<String> fileContentType) {this.fileContentType = fileContentType;}@Override@SuppressWarnings("deprecation")public String execute() throws Exception {for(int i=0; i<file.size(); i++){String path = ServletActionContext.getRequest().getRealPath("/upload");System.out.println("filepath-->"+file.get(i).getAbsolutePath());File directory = new File(path);if(!directory.exists())directory.mkdirs();OutputStream os = new FileOutputStream(new File(path,fileFileName.get(i)));InputStream is = new FileInputStream(file.get(i));byte[] by = new byte[4096];int length = 0;while(-1 != (length = is.read(by,0,by.length))){os.write(by,0,length);}os.close();is.close();}return SUCCESS;}}

文件上传页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page">  </head>    <body>    <s:form action="fileUpload" enctype="multipart/form-data" theme="simple" method="post">    <s:textfield name="username" /><br />    <s:file name="file" /><br />    <s:file name="file" /><br />    <s:file name="file" /><br />    <s:submit value="提交" />    </s:form>  </body></html>

文件上传后的结果页面：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>My JSP 'uploadresult.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>    username:<s:property value="username" />    <s:iterator value="fileFileName" id="f">    <s:property value="#f" />    </s:iterator>  </body></html>

DownloadFileAction.java 文件下载

package com.wansha.struts.action;import java.io.File;import java.io.InputStream;import java.io.UnsupportedEncodingException;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class DownloadFileAction extends ActionSupport {private String fileName;private InputStream is;public String getFileName() throws UnsupportedEncodingException {return new String(this.fileName.getBytes("UTF-8"),"8859_1");}public void setFileName(String fileName) throws UnsupportedEncodingException {this.fileName = new String(fileName.getBytes("8859_1"),"UTF-8");}public InputStream getDownloadFile(){this.is = ServletActionContext.getServletContext().getResourceAsStream("/upload/"+this.fileName);return this.is;}public boolean isFile(){File file = new File("/upload/",this.fileName);return file.exists();}@Overridepublic String execute() throws Exception {if(isFile()){return INPUT;}return SUCCESS;}}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"    "http://struts.apache.org/dtds/struts-2.1.7.dtd"><struts><constant name="struts.multipart.saveDir" value="/upload"></constant><!-- 临时存储文件夹 --><constant name="struts.multipart.maxSize" value="209715200"></constant><!-- 最大上传大小--><package name="view" extends="struts-default"><global-results><result name="filenotfound">/filenotfound.jsp</result></global-results><global-exception-mappings><exception-mapping result="filenotfound" exception="com.wansha.struts.exception.UnKnowErrorException"></exception-mapping></global-exception-mappings><action name="fileUpload" class="com.wansha.struts.action.UploadAction"><result name="success">/uploadresult.jsp</result></action><action name="download" class="com.wansha.struts.action.DownloadFileAction"><result type="stream"><param name="contentDisposition">attachment;filename=${fileName}</param><param name="inputName">downloadFile</param></result><result name="input">/filenotfound.jsp</result></action></package></struts>

downloadFile.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'downloadFile.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>    <a href="download?fileName=未命名.jpg">未命名.jpg文件下载</a><br />    <a href="download?fileName=appstore2.sql">appstore2.sql文件下载</a><br />    <a href="download?fileName=数据结构(Java).pdf">数据结构(Java).pdf文件下载</a><br />    <a href="download?fileName=site.xml">site.xml文件下载</a><br />  </body></html>

filenotfound.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>My JSP 'filenotfound.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>  找不到该文件！  </body></html>