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struts2文件上传/下载(附源代码)

2015-12-24 17:44 716 查看

转载自：http://blog.csdn.net/phantomes/article/details/8076832

struts2对于文件的操作提供很多便捷的地方，因此在项目中多少会涉及到它的使用，当然网上关于它的帖子也确实不少，清楚地，不清楚的，详细的，不详细的，都有很多，我也曾学到过很多热爱分享的同行们的帮助，在这里，我便按我自己思路，整理了下，写成这篇博文，并提供效果图和附件的下载。

首先，按老规矩，上效果图：

图一

图二

图三

图四

图五

然后我们看下这个项目的结构图：

第一步，新建一个web项目，我这里偷了个懒，upload/download，干脆就叫updownload，并加入struts2的相关jar包

第二步，新建com.action.UploadAction.java代码如下：

[java] view
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package com.action;

import java.io.File;

import java.util.List;

import org.apache.commons.io.FileUtils;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport

{

private static final long serialVersionUID = 1L;

private List<File>image;

private List<String>imageContentType;

private List<String>imageFileName;

@Override

public String execute() throws Exception

{

String path=ServletActionContext.getServletContext().getRealPath("/images");

System.out.println("保存路径为"+path);

[java] view
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//文件拷贝

if (image.size()>0)

{

File savedir=new File(path);

if(!savedir.exists()) savedir.mkdirs();

for (int i = 0; i < image.size(); i++)

{

System.out.println("datas的个数"+image.size());

File saveFile=new File(savedir, imageFileName.get(i));

FileUtils.copyFile(image.get(i), saveFile);

}

}else {

System.out.println("datas为空");

}

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//文件拷贝的另一实现方式，还有一种是字节流去读取，比较原始，这里就省略了。

// for (int i = 0; i < image.size(); i++)

// {

// File data=image.get(i);

// String fileName=imageFileName.get(i);

// fileName=path+"\\"+fileName;

// data.renameTo(new File(fileName));

// }

return SUCCESS;

}

public List<File> getImage()

{

return image;

}

public void setImage(List<File> image)

{

this.image = image;

}

public List<String> getImageContentType()

{

return imageContentType;

}

public void setImageContentType(List<String> imageContentType)

{

this.imageContentType = imageContentType;

}

public List<String> getImageFileName()

{

return imageFileName;

}

public void setImageFileName(List<String> imageFileName)

{

this.imageFileName = imageFileName;

}

}

第三步，编辑index.jsp用于上传，新建success.jsp用于上传成功后的提示，代码如下：

index.jsp：

[html] view
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@ taglib prefix="s" uri="/struts-tags" %>

<%

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 '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="upload" method="post" enctype="multipart/form-data" theme="simple">

<s:file name="image" label="Data1"></s:file>

<s:file name="image" label="Data2"></s:file>

<s:submit></s:submit>

</s:form>

</body>

</html>

success.jsp:

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<%@ 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 'success.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>

<h4>上传成功</h4>

<p><a href="download.jsp">下载文件</a></p>

</body>

</html>

第四步，新建struts.xml并配置web.xml，代码如下：(注：从struts.xml中可以看到，我这里对文件类型进行了规定，只能上传txt或者xml格式的文件)

struts.xml:

[html] view
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<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"

"http://struts.apache.org/dtds/struts-2.1.dtd">

<struts>

<constant name="struts.multipart.saveDir" value="e:/"></constant>

<package name="s2" extends="struts-default">



<action name="upload" class="com.action.UploadAction">

<result>success.jsp</result>

<result name="input">index.jsp</result>

<interceptor-ref name="fileUpload">



<param name="maximumSize">409600</param>



<param name="allowedTypes">text/plain , text/xml</param>

</interceptor-ref>

<interceptor-ref name="defaultStack"></interceptor-ref>

</action>

</package>

</struts>

web.xml:

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<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<filter>

<filter-name>s2</filter-name>

<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>s2</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<login-config>

<auth-method>BASIC</auth-method>

</login-config>

</web-app>

第五步，部署项目并运行起来，键入http://localhost:8080/updownload/index.jsp，检验文件上传是否成功，成功的话会跳转到success,jsp提示成功，并在服务器的updownload的目录下自动创建images目录，并将上传的文件保存。假使不成功请根据报错检查项目并进行改正。

第六步，加入文件上传能功能，我们便接着在此基础上，完成文件的下载功能。

首先是新建com.action.DownloadAction.java，代码如下：

[java] view
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package com.action;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import java.net.URLEncoder;

import java.util.List;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

import com.sun.org.apache.regexp.internal.REUtil;

public class DownloadAction extends ActionSupport

{

private static final long serialVersionUID = 1L;

private Dao dao=new Dao();

private List<FileItem>list;

private String fileId;

private FileItem fileItem;

//获得list

public String list()

{

list=dao.getFileList();

return "list-success";

}

//获得文件

public String get()

{

fileItem=dao.getFileItem(fileId);

return "get-success";

}

//获得输入流

public InputStream getInputStream()

{

try

{

String path=ServletActionContext.getServletContext().getRealPath("/");

String fileName=path+fileItem.getLocationPath();

FileInputStream fis=new FileInputStream(fileName);

return fis;

}

catch (FileNotFoundException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

return null;

}

//获得文件类型

public String getContentType()

{

return fileItem.getContentType();

}

//获得文件下载位置

public String getContentDisposition()

{

try

{

return "attachment;filename="+URLEncoder.encode(fileItem.getFileName(),"utf-8");

}

catch (UnsupportedEncodingException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

return null;

}

//获得文件字节大小

public int getContentLength()

{

return fileItem.getContentLength();

}

public List<FileItem> getList()

{

return list;

}

public void setList(List<FileItem> list)

{

this.list = list;

}

public String getFileId()

{

return fileId;

}

public void setFileId(String fileId)

{

this.fileId = fileId;

}

}

第七步，新建一个com.action.FileItem.java的javabean，用来模拟数据库中对应的实体类，这里我们就模拟下。代码如下：

[java] view
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package com.action;

public class FileItem

{

private String fileId;

private String fileName;

private String contentType;

private String locationPath;

private int contentLength;

//getter和setter略

}

第八步，写一个Dao，这个Dao原本该去查询数据库，并得到下载列表的，但是我们这里只是讲解struts2，所以便不连接数据库，如第七步一样，我们模拟出查询列表的方法，当然，查到的下载列表，就是我们在上传功能中，已经上传到服务器的文件列表。

所以我们新建的com.action.Dao的代码如下：

[java] view
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package com.action;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public class Dao

{

//静态数据，本该从数据库查出来的成为一个集合

private static Map<String, FileItem>files=new HashMap<String, FileItem>();

static{

long id=System.currentTimeMillis();

String fileId="100"+id;

files.put(fileId, new FileItem(fileId, "9-10.txt", "text/plain", "images\\9-10.txt", 206));

fileId="200"+id;

files.put(fileId, new FileItem(fileId, "aaa.xml", "text/xml", "images\\aaa.xml", 156));

fileId="300"+id;

files.put(fileId, new FileItem(fileId, "test.xml", "application/xml", "images\\test.xml", 617));

fileId="400"+id;

files.put(fileId, new FileItem(fileId, "Tomcat支持的文件类型.txt", "text/plain", "images\\Tomcat支持的文件类型.txt", 21*1024));

}

//获得文件下载列表

public List<FileItem> getFileList()

{

return new ArrayList<FileItem>(files.values());

}

//根据id获得单个文件

public FileItem getFileItem(String fileName)

{

return files.get(fileName);

}

}

第九步：新建download.jsp和list-success.jsp，代码如下：

download.jsp:

[html] view
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<%@ 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 'download.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>

<a href="download_list">显示下载列表</a>

</body>

</html>br>

</body>

</html>

list-success.jsp：

[html] view
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@ taglib prefix="s" uri="/struts-tags" %>

<%

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 'list-success.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>

<h4>文件下载列表</h4>

<s:iterator value="list">

<a href="download_get?fileId=${fileId} ">${fileName} </a>

<br/><br/>

</s:iterator>

</body>

</html>

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[html] view
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第十步：修改struts.xml并在文件上传的下面，配置文件下载的action，并在src目录下，添加i18n.properties资源文件，对项目中的可能错误进行国际化，并在struts.xml中进行引用，即：<constant name="struts.custom.i18n.resources" value="i18n"></constant><pre name="code" class="html"></pre>

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<pre name="code" class="html">修改后的struts.xml如下：</pre><pre name="code" class="html"></pre><pre name="code" class="html"><pre name="code" class="html"><?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"

"http://struts.apache.org/dtds/struts-2.1.dtd">

<struts>

<constant name="struts.multipart.saveDir" value="e:/"></constant>

<constant name="struts.custom.i18n.resources" value="i18n"></constant>

<package name="s2" extends="struts-default">



<action name="upload" class="com.action.UploadAction">

<result>success.jsp</result>

<result name="input">index.jsp</result>

<interceptor-ref name="fileUpload">



<param name="maximumSize">409600</param>



<param name="allowedTypes">text/plain , text/xml</param>

</interceptor-ref>

<interceptor-ref name="defaultStack"></interceptor-ref>

</action>



<action name="download_*" class="com.action.DownloadAction" method="{1}">

<result name="{1}-success">{1}-success.jsp</result>

<result name="get-success" type="stream"></result>

</action>

</package>

</struts></pre><pre name="code" class="html"></pre>i18n.properties文件，代码如下：<pre name="code" class="html">struts.messages.error.uploading=\u6587\u4EF6\u4E0A\u4F20\u9519\u8BEF

struts.messages.error.file.too.large=\u6587\u4EF6\u8FC7\u5927

struts.messages.error.content.type.not.allowed=\u6587\u4EF6\u7C7B\u578B\u4E0D\u5141\u8BB8

struts.messages.error.file.extension.not.allowed=\u6587\u4EF6\u6269\u5C55\u540D\u4E0D\u5141\u8BB8</pre><pre name="code" class="html"></pre><pre name="code" class="html"></pre><pre name="code" class="html"></pre><pre name="code" class="html"></pre><pre name="code" class="html"></pre><pre name="code" class="html"></pre><pre name="code" class="html"></pre><pre name="code" class="html"></pre><pre name="code" class="html"><pre name="code" class="html">【csdn】的附件上传真实太坑了，还得先上传为资源，再提供下载链接，我这边儿都上传了，可是还是看不见链接，没办法，只能给出我的iteye链接，<a href="http://jackjobs.iteye.com/blog/1699240">http://jackjobs.iteye.com/blog/1699240</a>，它是直接能下载的，也不要积分什么的，为此，还得鄙视一下csdn这种附件下载积分的做法，(#‵′)凸</pre>

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