Struts2 上传下载文件
目录结构-----------------------------------------------------------------------------------------
1.上传工具类
package org.usc.utils;
import java.io.File;
import java.io.FileInputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Properties;
/**
* @Desc：动态读取配置文件类</br>
* @Filename:UploadConfigurationRead.java</br>
* @Author:jwdstef</br>
* @Date:2012-6-13下午03:24:41</br>
*/
public class UploadConfigurationRead {
/**
* 属性文件全名,需要的时候请重新配置PFILE
*/
private static String PFILE = "upload.properties";
/**
* 配置文件路径
*/
private URI uri = null;
/**
* 属性文件所对应的属性对象变量
*/
private long m_lastModifiedTime = 0;
/**
* 对应于属性文件的文件对象变量
*/
private File m_file = null;
/**
* 属性文件所对应的属性对象变量
*/
private Properties m_props = null;
/**
* 唯一实例
*/
private static UploadConfigurationRead m_instance = new UploadConfigurationRead();
/**
* 私有构造函数
*
* @throws URISyntaxException
*/
private UploadConfigurationRead() {
try {
m_lastModifiedTime = getFile().lastModified();
if (m_lastModifiedTime == 0) {
System.err.println(PFILE + "file does not exist!");
}
m_props = new Properties();
m_props.load(new FileInputStream(getFile()));
} catch (URISyntaxException e) {
System.err.println(PFILE+"文件路径不正确");
e.printStackTrace();
} catch (Exception e) {
System.err.println(PFILE+"文件读取异常");
e.printStackTrace();
}
}
/**
* 查找ClassPath路径获取文件
*
* @return File对象
* @throws URISyntaxException
*/
private File getFile() throws URISyntaxException {
URI fileUri = this.getClass().getClassLoader().getResource(PFILE).toURI();
m_file = new File(fileUri);
return m_file;
}
/**
* 静态工厂方法
*
* @return 返回ConfigurationRead的单一实例
*/
public synchronized static UploadConfigurationRead getInstance() {
return m_instance;
}
/**
* 读取一特定的属性项
*/
public String getConfigItem(String name, String defaultVal) {
long newTime = m_file.lastModified();
// 检查属性文件是否被修改
if (newTime == 0) {
// 属性文件不存在
if (m_lastModifiedTime == 0) {
System.err.println(PFILE + " file does not exist!");
} else {
System.err.println(PFILE + " file was deleted!!");
}
return defaultVal;
} else if (newTime > m_lastModifiedTime) {
m_props.clear();
try {
m_props.load(new FileInputStream(getFile()));
} catch (Exception e) {
System.err.println("文件重新读取异常");
e.printStackTrace();
}
}
m_lastModifiedTime = newTime;
String val = m_props.getProperty(name);
if (val == null) {
return defaultVal;
} else {
return val;
}
}
/**
* 读取一特定的属性项
*
* @param name
* 属性项的项名
* @return 属性项的值（如此项存在）， 空（如此项不存在）
*/
public String getConfigItem(String name) {
return getConfigItem(name, "");
}
}
2.上传action
package org.usc.file;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import org.usc.utils.UploadConfigurationRead;
import com.opensymphony.xwork2.ActionSupport;
/**
* @Desc：多文件上传工具类</br>
* @Filename:UploadAction.java</br>
* @Author:jwdstef</br>
* @Date:2012-6-13下午03:26:23</br>
*/
public class UploadAction extends ActionSupport
{
private static final long serialVersionUID = 1L;
// 实际上传文件
private File upload;
// 文件的内容类型
private String uploadContentType;
// 上传文件名
private String uploadFileName;
private List<UploadFiles> uploadFiles = new ArrayList<UploadFiles>();
public String execute() throws Exception
{
try
{
String targetDirectory = ServletActionContext.getServletContext()
.getRealPath("/"+ UploadConfigurationRead.getInstance().getConfigItem("uploadFilePath").trim());// 获得路径
// 上传的文件名
String fileName = uploadFileName;
// 文件类型
String type = uploadContentType;
// 保存的文件名称，使用UUID+后缀进行保存
String realName = UUID.randomUUID().toString()+ getExt(fileName);
File target = new File(targetDirectory, realName);
// 上传至服务器的目录
FileUtils.copyFile(upload, target);
// 在把路径写入数据库即可
// 创建文件
UploadFiles uf = new UploadFiles();
uf.setUploadContentType(type);
uf.setUploadFileName(fileName);
uf.setUploadRealName(realName);
uploadFiles.add(uf);// 添加到需要下载文件的List集合中
ServletActionContext.getRequest().setAttribute("uploadFiles",
uploadFiles);
} catch (Exception e)
{
e.printStackTrace();
addActionError(e.getMessage());
return INPUT;
}
return SUCCESS;
}
public File[] getUpload()
{
return upload;
}
public void setUpload(File[] upload)
{
this.upload = upload;
}
public String[] getUploadContentType()
{
return uploadContentType;
}
public void setUploadContentType(String[] uploadContentType)
{
this.uploadContentType = uploadContentType;
}
public String[] getUploadFileName()
{
return uploadFileName;
}
public void setUploadFileName(String[] uploadFileName)
{
this.uploadFileName = uploadFileName;
}
public static String getExt(String fileName)
{
return fileName.substring(fileName.lastIndexOf("."));
}
}
3.上传文件pojo
package org.usc.file;
/**
* @Desc：上传文件工具VO类</br>
* @Filename:UploadFiles.java</br>
* @Author:jwdstef</br>
* @Date:2012-6-13下午03:23:36</br>
*/
public class UploadFiles
{
//上传的文件名称
private String uploadFileName;
//类型
private String uploadContentType;
//保存的文件真实名称，UUID
private String uploadRealName;
//如果使用数据库的话，建议这三个字段都进行保存
public String getUploadFileName()
{
return uploadFileName;
}
public void setUploadFileName(String uploadFileName)
{
this.uploadFileName = uploadFileName;
}
public String getUploadContentType()
{
return uploadContentType;
}
public void setUploadContentType(String uploadContentType)
{
this.uploadContentType = uploadContentType;
}
public String getUploadRealName()
{
return uploadRealName;
}
public void setUploadRealName(String uploadRealName)
{
this.uploadRealName = uploadRealName;
}
}
4.下载action
package org.usc.file;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.ServletActionContext;
import org.usc.utils.UploadConfigurationRead;
public class DownloadAction extends ActionSupport
{
private static final long serialVersionUID = 6329383258366253255L;
private String fileName;
private String fileRealName;
public void setFileName()
{
// 得到请求下载的文件名
String fname = ServletActionContext.getRequest().getParameter("name");
String frealname = ServletActionContext.getRequest().getParameter("realname");
try
{
/*
* 对fname参数进行UTF-8解码,注意:实际进行UTF-8解码时会使用本地编码，本机为GBK。
* 这里使用request.setCharacterEncoding解码无效.
* 只有解码了getDownloadFile()方法才能在下载目录下正确找到请求的文件
*/
fname = new String(fname.getBytes("ISO-8859-1"), "UTF-8");
frealname= new String(frealname.getBytes("ISO-8859-1"), "UTF-8");
} catch (Exception e)
{
e.printStackTrace();
}
this.fileName = fname;
this.fileRealName = frealname;
// System.out.println(fileName);
// System.out.println(fileRealName);
}
/*
* @getFileName 此方法对应的是struts.xml文件中的： <param
* name="contentDisposition">attachment;filename="${fileName}"</param>
* 这个属性设置的是下载工具下载文件时显示的文件名， 要想正确的显示中文文件名，我们需要对fileName再次编码
* 否则中文名文件将出现乱码，或无法下载的情况
*/
public String getFileName() throws UnsupportedEncodingException
{
fileRealName = new String(fileRealName.getBytes(), "ISO-8859-1");
return fileRealName;
}
/*
* @getDownloadFile 此方法对应的是struts.xml文件中的： <param
* name="inputName">downloadFile</param> 返回下载文件的流，可以参看struts2的源码
*/
public InputStream getDownloadFile()
{
this.setFileName();
return ServletActionContext.getServletContext().getResourceAsStream("/"+UploadConfigurationRead.getInstance().getConfigItem("uploadFilePath").trim()+"/" + fileName);
}
@Override
public String execute() throws Exception
{
return SUCCESS;
}
}
5.struts.properties配置
#Whether Struts is in development mode or not struts.devMode=true #Whether the localization messages should automatically be reloaded struts.i18n.reload=true #Whether to reload the XML configuration or not struts.configuration.xml.reload=true struts.multipart.maxSize = 633542440
6.struts配置文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.i18n.encoding" value="utf8" />
<package name="file" namespace="/" extends="struts-default">
<action name="showUpload">
<result>/upload.jsp</result>
</action>
<action name="upload" class="org.usc.file.UploadAction">
<result name="input">/upload.jsp</result>
<!-- <result name="success">/upload_success.jsp</result>-->
<result name="success">/download.jsp</result>
<interceptor-ref name="fileUpload">
<!--大家可以设置成自己的配置，想文件类型和大小等限制 -->
<!-- <param name="maximumSize">633542440</param> -->
<!-- <param name="allowedTypes">application/vnd.ms-excel</param> -->
<!-- -->
<!-- 容许文件类型为doc,ppt,xls,pdf,txt,java-->
<!-- -->
</interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
<action name="download" class="org.usc.file.DownloadAction">
<result name="success" type="stream">
<param name="contentDisposition">attachment;filename="${fileName}"</param>
<param name="inputName">downloadFile</param>
</result>
</action>
</package>
</struts>7.upload.properties上传文件路径文件
uploadFilePath=upload/file
上传到项目对应的webroot的upload文件下的file文件中8.上传文件jsp页面
<%@ page language="java" contentType="text/html; charset=utf-8"%> <%@ taglib prefix="s" uri="/struts-tags"%> <html> <head> <title>upload</title> </head> <body> <script type="text/javascript"> <s:form action="upload.action" theme="simple" method="post" enctype="multipart/form-data"> <table align="center" width="50%" border="1"> <tr> <td> 上传文件 </td> <td id="more" > <s:file name="upload"></s:file> </td> </tr> <tr> <td> <s:submit value=" 确认 "></s:submit> </td> <td> <s:reset value=" 重置 "></s:reset> </td> </tr> </table> </s:form> </body> </html>
9.下载文件jsp页面
<%@ page language="java" contentType="text/html; charset=utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
<title>download</title>
</head>
<body>
<table align="center" width="50%" border="1">
<tr>
<td align="center">
文件下载
</td>
</tr>
<c:forEach var="uploadFiles" items="${uploadFiles}">
<tr>
<td>
<a
href="download.action?name=${uploadFiles.uploadRealName }&realname=${uploadFiles.uploadFileName }">${uploadFiles.uploadFileName
}</a>
</td>
</tr>
</c:forEach>
</table>
</body>
</html>
10.效果图