Struts2文件上传(多文件)和下载实例代码

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细细品味-Struts2

struts2

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">/download.jsp</result>
           <interceptor-ref name="fileUpload">






           </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">



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>

       

       <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>