struts1多文件上传、下载实例

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实例:
第一步导入包：
commons-fileupload-1.2.1.jar
commons-io-1.3.2.jar
commons-logging-1.0.4.jar
freemarker-2.3.15.jar
ognl-2.7.3.jar
xwork-core-2.1.6.jar
struts.jar
commons-beanutils-1.7.0.jar
commons-digester.jar

第二上传upload,jsp、下载download.jsp的jsp页面

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><%@ taglib uri="/WEB-INF/taglib/struts-html.tld" prefix="html" %><html:html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title><script type="text/javascript"><!--addMore函数可以提供上传多个文件上传-->    var index = 1;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 = "file["+index+"]";    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);    index ++;}</script></head><body><!--<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>-->        <html:form action="/UpDownLoadAction.do?dispatch=upLoadFile"  method="post" enctype="multipart/form-data">            <table align="center" width="50%" border="1">                <tr>                    <td>                        上传文件                    </td>                    <td id="more" >                        <input  type="file" id="file_0" name="file[0]"/>                        <input type="button" value="上传更多..." onclick="addMore()">                    </td>                </tr>                <tr>                    <td>                        <html:submit value=" 确认 "></html:submit>                    </td>                    <td>                        <html:reset value=" 重置 "></html:reset>                    </td>                </tr>            </table>        </html:form>    </body></html:html>

<%@ page language="java" contentType="text/html; charset=utf-8"    pageEncoding="utf-8"%><%@page import="demo.updown.file.model.UploadFiles"%><%@page import="java.util.*;"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><title>文件下载</title></head><body><table align="center" width="50%" border="1">    <tr><td align="center">文件下载</td></tr><%List files = (ArrayList)request.getAttribute("fileList"); for(int i = 0;i<files.size();i++){UploadFiles file = (UploadFiles)files.get(i);%>        <tr>            <td>                <a href="/updownfile/UpDownLoadAction.do?dispatch=downLoadFile&name=<%=file.getUploadRealName() %>&realname=<%=file.getUploadFileName() %>">                        <%=file.getUploadFileName() %></a>            </td>        </tr>    <%} %>    </table></body></html>

第三步实体类（前台要显示的数据信息）

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    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;    }

第四步上传的业务接口与实现类

public interface UpDownLoad {    public UploadFiles uploadfile(FormFile file)throws IOException;}

public class UpDownLoadImpl implements UpDownLoad{    String path = "E:/apache-tomcat/apache-tomcat-6.0.18/webapps/updownfile/file";    public UploadFiles uploadfile(FormFile file) throws IOException {        // TODO Auto-generated method stub        String fileName = file.getFileName();//原文件名        String realName = UUID.randomUUID().toString()                + fileName.substring(fileName.lastIndexOf("."));//保存的文件名称，使用UUID+后缀进行保存        //创建文件夹，保存上传文件        File filepath = new File(path);        if (!filepath.isDirectory()) {            filepath.mkdir();        }        //文件上传后的路径        String filePath = filepath + "/" + realName;                InputStream stream = file.getInputStream();        OutputStream bos = new FileOutputStream(filePath);        int bytesRead = 0;        byte[] buffer = new byte[8192];        while ((bytesRead = stream.read(buffer, 0, 8192)) != -1) {            bos.write(buffer, 0, bytesRead);        }        bos.close();        stream.close();                //页面上显示上传的文件信息        UploadFiles files = new UploadFiles();        files.setUploadFileName(file.getFileName());        files.setUploadContentType(file.getContentType());        files.setUploadRealName(realName);                return files;    }}

第五步action

public class UpLoadActionForm extends ActionForm {    private static final long serialVersionUID = 1L;    /**     * struts1文件上传用的是调用的是专门上传的接口FormFile,     * 单文件上传只需在Form中给一个FormFile类型的属性，     * 多文件上传时，struts在页面端将多个文件封装成一个数组，转给Form类时转换成List     * 所以我们在页面上使用数组形式对文件进行提交，在Form类中用List对文件进行接收。     *      * */    private List<FormFile> files = new ArrayList<FormFile>();    public FormFile getFile(int i) {        return files.get(i);    }    public void setFile(int i,FormFile file) {        files.add(file);    }        public List getFiles(){        return files;    }}

public class UpDownLoadAction extends DispatchAction {    /**     * 上传文件     * */    public ActionForward upLoadFile(ActionMapping mapping, ActionForm form,            HttpServletRequest request, HttpServletResponse response)            throws IOException {        ActionForward forward = null;        ActionMessages errors = new ActionMessages();        UpLoadActionForm upLoad = (UpLoadActionForm) form;        List upLoads = upLoad.getFiles();                UpDownLoad updownload = new UpDownLoadImpl();        List fileList = new ArrayList();        for(int i = 0;i<upLoads.size();i++){            FormFile formFile = (FormFile) upLoads.get(i);            //调用单个文件上传的方法            UploadFiles files = updownload.uploadfile(formFile);            System.out.println("上传文件：" + files.getUploadFileName());            fileList.add(files);        }        request.setAttribute("fileList", fileList);        return mapping.findForward("download");    }    /**     * 文件下载     * */    public ActionForward downLoadFile(ActionMapping mapping, ActionForm form,            HttpServletRequest request, HttpServletResponse response)            throws IOException, ServletException {        String filename = request.getParameter("name");        String realname = request.getParameter("realname");        response.reset();//可以加也可以不加        response.setContentType("application/x-download");//设置为下载application/x-download        /*         * 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         */        realname = URLEncoder.encode(realname, "UTF-8");        response.addHeader("Content-Disposition", "attachment;filename="+ realname);//下载文件时，显示的文件名        //下载文件的路径        String path = this.servlet.getServletContext().getRealPath("/file") + "/" + filename;        OutputStream output = response.getOutputStream();        FileInputStream fis = new FileInputStream(path);        byte[] b = new byte[1024];        int i = 0;        while ((i = fis.read(b)) > 0) {            output.write(b, 0, i);        }        output.flush();        fis.close();        output.close();        return null;    }}

第六步web.xml和struts-config.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE web-app PUBLIC    "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"    "http://java.sun.com/dtd/web-app_2_3.dtd"><web-app>    <servlet>        <servlet-name>action</servlet-name>        <servlet-class>            org.apache.struts.action.ActionServlet        </servlet-class>        <init-param>            <param-name>config</param-name>            <param-value>/WEB-INF/struts-config.xml</param-value>        </init-param>        <init-param>            <param-name>debug</param-name>            <param-value>3</param-value>        </init-param>        <init-param>            <param-name>detail</param-name>            <param-value>3</param-value>        </init-param>        <load-on-startup>1</load-on-startup>    </servlet>        <servlet-mapping>        <servlet-name>action</servlet-name>        <url-pattern>*.do</url-pattern>    </servlet-mapping></web-app>

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts-config PUBLIC          "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"          "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">    <struts-config>        <form-beans>            <form-bean name="UpLoadActionForm"                type="demo.updown.file.actionform.UpLoadActionForm" />        </form-beans>                <action-mappings>            <action path="/UpDownLoadAction" name="UpLoadActionForm" parameter="dispatch"            scope="request"            type="demo.updown.file.action.UpDownLoadAction"            validate="true">                <forward name="download" path="/download.jsp"></forward>            </action>        </action-mappings>    </struts-config>

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