以上是在MyEclipse的存放位置
struts.xml配置如下所示：
<?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" class="org.usc.file.UploadAction" method="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">2097152</param>单位是字节 2M （2097152B） -->
<!-- <param name="allowedTypes">image/bmp,image/x-png,image/png,image/gif,image/jpeg,image/jpg,image/pjpeg</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>
struts.properties配置如下图所示：
upload.properties配置可自己随意定义一个路径 如下图所示：
上传UploadAction.java代码如下：
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;
/**
* 多文件上传类
*
* @author
*
* @Time
*/
public class UploadAction extends ActionSupport {
/**
*
*/
private static final long serialVersionUID = 1L;
private File[] upload;// 实际上传文件
private String[] uploadContentType; // 文件的内容类型
private String[] uploadFileName; // 上传文件名
private List<UploadFiles> uploadFiles = new ArrayList<UploadFiles>();
public String showUpload() {
return SUCCESS;
}
public String execute() throws Exception {
try {
String targetDirectory = ServletActionContext.getServletContext()
.getRealPath(
"/"
+ UploadConfigurationRead.getInstance()
.getConfigItem("uploadFilePath")
.trim());// 获得路径
for (int i = 0; i < upload.length; i++) {
String fileName = uploadFileName[i];// 上传的文件名
String type = uploadContentType[i];// 文件类型
String realName = UUID.randomUUID().toString()
+ getExt(fileName);// 保存的文件名称，使用UUID+后缀进行保存
File target = new File(targetDirectory, realName);
FileUtils.copyFile(upload[i], target);// 上传至服务器的目录，一般都这样操作，
// 在把路径写入数据库即可
UploadFiles uf = new UploadFiles();// 创建文件
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
// uploadRealName[i]=UUID.randomUUID().toString();
// System.out.println("uploadRealName:"+uploadRealName[i]);
// for(File file:upload)
// {
// System.out.println("filename:"+file.getName());
// }
// System.out.println("filename:"+fileName);
// System.out.println("Ext:"+getExt(fileName));
// System.out.println("Type:"+type);
// System.out.println(target.getPath());
}
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("."));
}
}
下载DownloadAction.java如下：
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;
}
}
UploadConfigurationRead.java如下：
package org.usc.utils;
import java.io.File;
import java.io.FileInputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Properties;
/**
* 动态读取配置文件类
*
* @author
*
* @Time
*/
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, "");
}
}
UploadFiles.java代码如下
package org.usc.file;
/**
* 文件类，需要的时候，可以和数据库进行关联
*
* @author
*
* @Time
*/
public class UploadFiles {
private String uploadFileName;// 上传的文件名称
private String uploadContentType;// 类型
private String uploadRealName;// 保存的文件真实名称，UUID
// 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;
}
}
上传upload.jsp
<%@ 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">
<!--addMore函数可以提供上传多个文件上传-->
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 = "upload";
button.type = "button";
button.value = " 删除 ";
button.onclick = function()
{
td.removeChild(br);
td.removeChild(input);
td.removeChild(button);
}
td.appendChild(br);
td.appendChild(input);
td.appendChild(button);
}
</script>
<!--<h3><font color="red">上传文件类型后缀为doc,ppt,xls,pdf,txt,java，每个文件大小不能大于50M</font></h3>-->
<table align="center" width="50%">
<tr>
<td>
<s:fielderror cssStyle="color:red" />
</td>
</tr>
</table>
<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>
<input type="button" value="上传更多..." onclick="addMore()">
</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>
下载download.jsp
<%@ 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>
输入地址：localhost:8080/struts2_0610_FileUpLoadAndDownLoad/showUpload.action
显示如下图所示：
上传之后：
