<br/> ----單文件上傳----<br/>

<s:form action="uploadOneAction" enctype="multipart/form-data">

????????<s:textfield name="username" label="姓名"></s:textfield>

????????<s:file name="photo" label="相片"></s:file>

????????<s:submit value="上傳"></s:submit>

</s:form>

<package name="p1" extends="struts-default">

????????<action name="uploadOneAction" class="com.itheima.action.UploadAction1">

????????????<result>/success.jsp</result>

????????</action>

</package>

public class UploadAction1 extends ActionSupport {

????// 變量命名需與表單名稱保持一致

????private String username;

????// 與表單字段對應，必須是java.io.File類型的

????private File photo;

????// 上傳的文件名，格式：上傳字段名+FileName

????private String photoFileName;

????// 上傳文件MIME類型，格式：上傳字段名+ContentType

????private String photoContentType;

?

????public String execute() throws Exception {

????????// 打印相關字段屬性

????????System.out.println(username);

????????System.out.println(photo);

????????System.out.println(photoFileName);

????????System.out.println(photoContentType);

????????/*

???????? * 上傳文件步驟：

???????? * 1.得到上傳文件的真實路徑

???????? * 2.構建輸入流

???????? * 3.構建輸出流

???????? */

????????// 1.得到上傳文件的真實路徑

//上傳字段：上傳到某個文件夾。存到應用的files目錄下

????????String storeDir = ServletActionContext.getServletContext().getRealPath(

????????????????"files");

????????// 把上傳過來的文件，重寫創建一個文件

????????File file = new File(storeDir, photoFileName);

?

????????/*

????????// 以前復制文件的方式

???????? * 但是現在呢？我們不需要這么做啦，Struts2都幫我們封裝了

????????InputStream in = new FileInputStream(photo);

????????OutputStream out = new FileOutputStream(file);

?

????????int len = 0;

????????byte[] bys = new byte[1024];

????????while ((len = in.read(bys)) != -1) {

????????????out.write(bys, 0, len);

????????}

????????in.close();

????????out.close();

????????*/

????????FileUtils.copyFile(photo, file);

????????return SUCCESS;

????}

}

<br>-----多文件上傳-----<br>

<form action="${pageContext.request.contextPath}/upload2.action" method="post" enctype="multipart/form-data">

????用戶名：<input type="text" name="username"/><br/>

????靚照：<input type="file" name="photo"/><br/>

????靚照：<input type="file" name="photo"/><br/>

????<input type="submit" value="上傳"/>

</form>

<action name="upload2" class="com.itheima.actions.UploadAction2" method="upload">

<!-- ????????????<interceptor-ref name="defaultStack"> -->

<!-- ????????????????<param name="fileUpload.allowedTypes">image/jpeg,image/png</param> -->

<!-- ????????????????<param name="fileUpload.allowedExtensionsSet">jpg,jpeg,png</param> -->

<!-- ????????????</interceptor-ref> -->

????????????<result>/success.jsp</result>

????????????<result name="error">/error.jsp</result>

????????????<result name="input">/indexMulti.jsp</result>

????????</action>

//文件上傳：fileUpload攔截器完成的

public class UploadAction2 extends ActionSupport {

????

????private String username;

????private File[] photo;//和表單的上傳字段名保持一致。類型是File類型的 .數組或List

????private String[] photoFileName;//上傳的文件名

????private String[] photoContentType;//上傳文件的MIME類型

????public String upload(){

????????//上傳字段：上傳到某個文件夾。存到應用的images目錄下

????????String realPath = ServletActionContext.getServletContext().getRealPath("/images");

????????File directory = new File(realPath);

????????if(!directory.exists()){

????????????directory.mkdirs();

????????}

????????try {

????????????for(int i=0;i<photo.length;i++){

????????????????FileUtils.copyFile(photo[i], new File(directory, photoFileName[i]));

????????????}

????????????return SUCCESS;

????????} catch (IOException e) {

????????????e.printStackTrace();

????????????return ERROR;

????????}

????}

}

<action name="uploadOneAction" class="com.itheima.action.UploadAction1">

????????????<interceptor-ref name="defaultStack">

????????????<!--對已有的攔截器注入參數 -->

????????????<param name="fileUpload.allowedExtensions">txt</param>

????????????</interceptor-ref>

????????????<result>/success.jsp</result>

</action>

public class DownloadAction extends ActionSupport {

????// 文件下載用到的輸入流

????private InputStream imageFileIn;

????// 記住下載文件的文件名

????private String fileName;

?

????public String download1() throws Exception {

????????// 給輸入流賦值即可

????????String realPath = ServletActionContext.getServletContext().getRealPath(

????????????????"/file/mm.jpg");

????????// c:\apacher\file\4.jpg

????????fileName = realPath.substring(realPath.lastIndexOf("\\") + 1);

????????// 解決中文名稱亂碼文件

????????fileName = URLEncoder.encode(fileName, "UTF-8");

????????imageFileIn = new FileInputStream(realPath);

????????return SUCCESS;

????}

}

<action name="download1" class="com.itheima.action.DownloadAction" method="download1">

????????????<result type="stream">

????????????????<!--動作類中InputStream的字段名 -->

????????????????<param name="inputName">imageFileIn</param>

????????????????<!-- 告知瀏覽器響應頭：文件的MIME類型 -->

????????????????<param name="contentType">application/octet-stream</param>

????????????????<!--告訴瀏覽器下載的方式 -->

????????????????<!-- 使用OGNL表達式獲取動作類中的屬性 -->

????????????????<param name="contentDisposition">attachment;filename=${fileName}</param>

????????????</result>

</action>