实验_Struts2文件的上传，下载

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1.实验名称
Struts2文件的上传，下载

2.实验目的
熟练Struts中文件的上传和下载功能。

3.实验内容
将文件上传和文件下载功能连起来，即上传后的文件以一个可下载列表显示出来，想下载什么点击鼠标就可以下载。

图片一

4.文件描述：
uploadFile.jsp:上传页。在form表单中包含了一个文本框（上传用户的姓名）和三个文件上传选项。
showFile.jsp：下载页(上传成功的跳转页)，可显示文件名、上传者以及上传时间，并对上传的文件设置了超链接，供下载使用。
DocUploadAction.java：采用数组方式实现多文件上传。
DocDownloadAction.java：实现文件下载相关的方法。
struts.xml:分别配置了上传和下载的Action（DocUploadAction和DocDownloadAction）。在文件上传时，做了一些简单的过滤。

5.实验源代码

uploadFile.jsp

<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>多文件上传</title></head><body><center><s:form action="docUpload" method="post" enctype="multipart/form-data">    <s:textfield name="name" label="姓名" size="20"/>    <s:file name="upload" label="选择文档" size="20"/>    <s:file name="upload" label="选择文档" size="20"/>    <s:file name="upload" label="选择文档" size="20"/>    <s:submit value="确认上传" align="center"/></s:form></center></body>

showFile.jsp

<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>显示上传文档</title></head><body><center>    <font style="font-size:18px;color:red">上传者：<s:property value="name"/></font>    <table width="45%" cellpadding="0" cellspacing="0" border="1">        <tr><th>文件名称</th>            <th>上传者</th>            <th>上传时间</th></tr>        <s:iterator value="uploadFileName" status="st" var="doc">        <tr><td align="center">            <a href="docDownload.action?downPath=upload/<s:property value="#doc"/>">         <s:property value="#doc"/>                     </a>        </td>        <td align="center"><s:property value="name"/></td>        <td align="center"><s:date name="createTime" format="yyyy-MM-dd HH:mm:ss"/></td>        </tr>        </s:iterator>    </table></center></body>

DocUploadAction.java

public class DocUploadAction extends ActionSupport {    private String name;    private File[] upload;    private String[] uploadContentType;    private String[] uploadFileName;    private String savePath;    private Date createTime;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    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 String getSavePath() {        return savePath;    }    public void setSavePath(String savePath) {        this.savePath = savePath;    }       public Date getCreateTime(){                createTime=new Date();        return createTime;    }    public static void copy(File source,File target){               InputStream inputStream=null;        OutputStream outputStream=null;        try{            inputStream=new BufferedInputStream(new FileInputStream(source));            outputStream=new BufferedOutputStream(new FileOutputStream(target));            byte[] buffer=new byte[1024];            int length=0;            while((length=inputStream.read(buffer))>0){                outputStream.write(buffer, 0, length);            }        }catch(Exception e){            e.printStackTrace();        }finally{            if(null!=inputStream){                try {                    inputStream.close();                } catch (IOException e2) {                    e2.printStackTrace();                }            }            if(null!=outputStream){                try{                    outputStream.close();                }catch(Exception e2){                    e2.printStackTrace();                }            }        }    }    @Override    public String execute() throws Exception {              for(int i=0;i<upload.length;i++){           String path=ServletActionContext.getServletContext().getRealPath(this.getSavePath())+"\\"+this.uploadFileName[i];            File target=new File(path);            copy(this.upload[i],target);        }        return SUCCESS;    }   }

DocDownloadAction.java

public class DocDownloadAction extends ActionSupport {      private String downPath;        public InputStream getInputStream() throws Exception{           return ServletActionContext.getServletContext().getResourceAsStream(downPath);    }       public String getDownPath(){        return downPath;    }    public void setDownPath(String downPath){        this.downPath=downPath;    }    public String getDownloadFileName(){                String downFileName=downPath.substring(7);        try{            downFileName=new String(downFileName.getBytes(),"utf-8");        }catch(Exception e){            e.printStackTrace();        }        return downFileName;    }    @Override    public String execute() throws Exception {              return SUCCESS;    }   }

struts.xml

<struts>    <constant name="struts.i18n.encoding" value="utf-8"/>    <package name="default" extends="struts-default">               <action name="docUpload" class="nuc.sw.action.DocUploadAction">            <interceptor-ref name="fileUpload">                <param name="maximumSize">50000</param>            </interceptor-ref>            <interceptor-ref name="defaultStack"/>            <param name="savePath">/upload</param>            <result>/showFile.jsp</result>            <result name="input">/uploadFile.jsp</result>        </action>               <action name="docDownload" class="nuc.sw.action.DocDownloadAction">            <result type="stream">                <param name="contentType">                    application/msword,text/plain                </param>                <param name="inputName">inputStream</param>                <param name="contentDisposition">                    attachment;filename="${downloadFileName}"                </param>                <param name="bufferSize">40960</param>            </result>        </action>           </package></struts>

实验截图：
文件上传：
图片二

文件下载：
图片三

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