Struts2（13）:Struts2的上传下载续2

最新推荐文章于 2025-05-04 11:12:33 发布

iteye_9280

最新推荐文章于 2025-05-04 11:12:33 发布

阅读量91

点赞数

CC 4.0 BY-SA版权

分类专栏： Struts 文章标签： Java Struts JSP OS JavaScript ViewUI

本文链接：https://blog.youkuaiyun.com/iteye_9280/article/details/82071758

Struts 专栏收录该内容

17 篇文章

订阅专栏

本节主要介绍上传任意数据的文件、指定文件类型上传与Struts2的下载

1，首先改造upload.jsp，写了个JS事件，可以添加删除上传框。可以上传任意多（大于等于1）个文件！

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%@ taglib  prefix="s" uri="/struts-tags"%>
<html>
<script type="text/javascript">
function addMore()
{
	var td = document.getElementById("more");
	var br = document.createElement("br");
	var input = document.createElement("input");
	var button = document.createElement("input");
	
	input.type="file";
	input.name="file";
	
	button.type="button";
	button.value="Remove";
	
	button.onclick = function(){
		td.removeChild(br);
		td.removeChild(input);
		td.removeChild(button);
	}
	
	td.appendChild(br);
	td.appendChild(input);
	td.appendChild(button);
}
</script>
  <body>
  		<table>
  			<tr><td>
  				<s:fielderror cssStyle="color:red"/>
  			</td></tr>
  		</table>
	   <s:form action="upload" theme="simple" enctype="multipart/form-data">
	  	<table align="center" width="40%">
		    <tr>
		    	<td>username:</td>
		    	<td><s:textfield name="username"></s:textfield></td>
		    </tr>
		    <tr>
		    	<td>password:</td>
		    	<td><s:password name="password"></s:password></td>
		    </tr>
		    <tr>
		    	<td>file:</td>
		    	<td id="more"><!-- 定义一个id，方便javascript调用 -->
		    		<s:file name="file"></s:file>
		    		<input type="button" value="Add More..." οnclick="addMore()">
		    	</td>
		    </tr>
		    <tr>
		    	<td><s:submit></s:submit></td>
		    	<td><s:reset></s:reset></td>
		    </tr>
	    </table>
	  </s:form>
  </body>
</html>

2，UploadAction.java

package com.test.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 UploadAction extends ActionSupport {
	private String username;
	private String password;
	private List<File> file;
	//下面两个变量是文件名与文件类型，Struts2会自动为以下两变量赋值
	private List<String> fileFileName;
	private List<String> fileContentType;
	
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	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;
	}
	public String execute() throws Exception {
		for(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,this.getFileFileName().get(i));
			OutputStream os = new FileOutputStream(destFile);
			byte[] buffer = new byte[400];
			int length = 0;
			while((length= is.read(buffer)) > 0){
				os.write(buffer, 0, length);
			}
			is.close();
			os.close();
		}
		return SUCCESS;
	}
}

3，struts.xml

<action name="upload" class="com.test.action.UploadAction">
	<result name="success">/uploadResult.jsp</result>
	<result name="input">/upload.jsp</result>
	<interceptor-ref name="fileUpload">
		<!--指定上传文件大小，下面是400K-->
		<param name="maximumSize">409600</param>
		<!--指定上传文件类型，这里只允许上传PPT文件，文件类型名可以在Tomcat的conf\web.xml中查找-->
		<param name="allowedTypes">application/vnd.ms-powerpoint</param>			
	</interceptor-ref><interceptor-ref name="defaultStack"></interceptor-ref>
</action>

以上就完成了一个多文件，指定文件类型上传功能。

Struts2的下载实现

download.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
  <body>
  	<s:a href="/struts2/download.action">downlaod</s:a>
  </body>
</html>

DownloadAction.java

package com.test.action;

import java.io.InputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class DownloadAction extends ActionSupport {
	
	public InputStream getDownloadFile(){
		return ServletActionContext.getServletContext().getResourceAsStream("upload/11.ppt");
	}
	
	public String execute() throws Exception {
		return SUCCESS;
	}
}

struts.xml

<action name="download" class="com.test.action.DownloadAction">
				<result name="success" type="stream">
					<!--下载文件的类型-->
					<param name="contentType">application/vnd.ms-powerpoint</param>
					<!--指定下载文件的默认文件名-->		
					<param name="contentDisposition">filename="Struts2.ppt"</param>
					<!--对应的getDownloadFile类中的getDownloadFile方法-->
					<param name="inputName">downloadFile</param>	
				</result>
</action>