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struts2文件上传/下载(附源代码)

2012-10-16 14:25 369 查看
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:

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);
 
//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");
}
 
//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:

<%@ 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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</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:

<%@ 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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</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:

<?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">
<!-- 文件上传 -->
<action name="upload" class="com.action.UploadAction">
<result>success.jsp</result>
<result name="input">index.jsp</result>
<interceptor-ref name="fileUpload">
<!-- 单个上传文件的最大值-->
<param name="maximumSize">409600</param>
<!-- 只能上传的文件的类型,可到tomcat的web-xml中查看各种文件类型-->
<param name="allowedTypes">text/plain , text/xml</param>
</interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>

</package>
</struts>


web.xml:

<?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:

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:

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:

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:

<%@ 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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>
<a href="download_list">显示下载列表</a>
</body>

</html>br>
</body>
</html>


list-success.jsp:

<%@ 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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</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>
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>




修改后的struts.xml如下:
<?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">
<!-- 文件上传 -->
<action name="upload" class="com.action.UploadAction">
<result>success.jsp</result>
<result name="input">index.jsp</result>
<interceptor-ref name="fileUpload">
<!-- 单个上传文件的最大值-->
<param name="maximumSize">409600</param>
<!-- 只能上传的文件的类型,可到tomcat的web-xml中查看各种文件类型-->
<param name="allowedTypes">text/plain , text/xml</param>
</interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>

<!-- 文件下载 -->
<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>
i18n.properties文件,代码如下:
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
【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,http://jackjobs.iteye.com/blog/1699240,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















                                            
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