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> <package name="my" namespace="/" extends="struts-default"> <!-- 文件上传 --> <action name="upload" class="com.action.UploadAction"> <result name="success">/jsp/fileupload.jsp</result> </action>
<!-- 文件下载 --> <action name="download" class="com.action.DownAction"> <result name="success" type="stream"> <!-- inputNamec参数对应action中的getFileDownload方法，参数的值就是此方法去掉get前缀、首字母小写的字符串 --> <param name="inputName">fileDownload</param> <!-- 下载缓冲区的大小 --> <param name="bufferSize">1024</param> </result> </action> </package> </struts>
文件上传：
fileupload.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 'fileupload.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> <form action="upload" method="post" enctype="multipart/form-data"> <input type="file" name="file"><br> <input name="miaoshu"><br> <input type="submit" value="提交"> </form> </body> </html>
UploadAction.java
package com.action; import java.io.*; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; public class UploadAction extends ActionSupport{ String miaoshu; File file; String fileFileName;//获取文件名，该属性名的组成为file+FileName 后面是固定写法 String fileContentType;//获取文件类型 public String getMiaoshu() { return miaoshu; } public void setMiaoshu(String miaoshu) { this.miaoshu = miaoshu; } public File getFile() { return file; } public void setFile(File file) { this.file = file; } public String getFileFileName() { return fileFileName; } public void setFileFileName(String fileFileName) { this.fileFileName = fileFileName; } public String getFileContentType() { return fileContentType; } public void setFileContentType(String fileContentType) { this.fileContentType = fileContentType; } @Override public String execute() throws Exception { // TODO Auto-generated method stub System.out.println(miaoshu); //获取文件存储路径 String path = ServletActionContext.getServletContext().getRealPath("/upload"); //输出流 OutputStream os = new FileOutputStream(new File(path,fileFileName)); //输入流 InputStream is = new FileInputStream(file); byte[] buf = new byte[1024]; int length = 0 ; while(-1 != (length = is.read(buf) ) ) { os.write(buf, 0, length) ; } is.close(); os.flush(); os.close(); return SUCCESS; } }
文件下载：
filedownload.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 'filedownload.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> <form action="download" method="post"> 输入文件名:<input name="filename"><br/> <input type="submit" value="下载"> </form> <p><a href="javascript:window.location='download?filename='+encodeURI('李四.png')">李四下载</a></p> </body> </html>
DownAction.java
package com.action; import java.io.InputStream; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; public class DownAction extends ActionSupport{ String filename; public String getFilename() { return filename; } public void setFilename(String filename) { this.filename = filename; } public InputStream getFileDownload(){ try { //设置下载的头部信息，包括文件名等等 ServletActionContext.getResponse().setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(filename, "utf-8")); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return ServletActionContext.getServletContext().getResourceAsStream("upload/"+filename); } @Override public String execute() throws Exception { // TODO Auto-generated method stub return SUCCESS; } }
附：文件批量上传
filesupload.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 'filesupload.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> <script type="text/javascript"> function add(){ var input = document.createElement("input"); input.setAttribute("type","file"); input.setAttribute("name","file"); document.getElementById("files").appendChild(input); } </script> <body> <form action="uploads" method="post" enctype="multipart/form-data"> <div id="files"> <input type="file" name="file" /> </div> <input type="button" value="添加" onclick="add()"> <input type="submit" value="提交"> </form> </body> </html>
UploadsAction.java
package com.upload.action; 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.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; public class UploadsAction extends ActionSupport{ List<File> file; List<String> fileFileName; List<String> fileContentType; 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 public String execute() throws Exception { // TODO Auto-generated method stub //获取文件存储路径 String path = ServletActionContext.getServletContext().getRealPath("/upload"); for(int i=0;i<file.size();i++){ //输出流 OutputStream os = new FileOutputStream(new File(path,fileFileName.get(i))); //输入流 InputStream is = new FileInputStream(file.get(i)); byte[] buf = new byte[1024]; int length = 0 ; while(-1 != (length = is.read(buf) ) ) { os.write(buf, 0, length) ; } is.close(); os.flush(); os.close(); } addActionMessage("成功"); return SUCCESS; } }