Struts 2 檔案上傳與下載
阿新 • • 發佈：2018-11-12
單個檔案上傳
表單設定enctype="multipart/form-data“
表單設定method="POST“ <s:file name="f1" label="logo"/>
多檔案上傳：
把所有的屬性改為陣列即可。
private File []f1;
private String [] contentType;
private String [] fileName;
Action中設定:
get，set方法必須新增file的名字；
f1, contentType, fileName三個屬性 (f1為File型別, contentType, fileName為String型別)
f1的getter/setter方法
f1ContentType的getter/setter方法
f1FileName的getter/setter方法
//上傳Action public class UpfileAction extends ActionSupport { private File file; private String contentType; private String fileName; private String txt; public String getTxt() { return txt; } public void setTxt(String txt) { this.txt = txt; } public File getFile() { return file; } public void setFile(File file) { this.file = file; } public String getFileContentType() { return contentType; } public void setFileContentType(String contentType) { this.contentType = contentType; } public String getFileFileName() { return fileName; } public void setFileFileName(String fileName) { this.fileName = fileName; } @Override public String execute() throws Exception { System.out.println(txt); // 獲取伺服器根目錄 String path = ServletActionContext.getServletContext().getRealPath( "/upfile"); // 建立服務根目錄下的資料夾 File dir = new File(path); if (!dir.exists()) { dir.mkdirs(); } // 目標檔案 File dest = new File(dir, fileName); // 位元組輸入輸出流 FileInputStream in = new FileInputStream(file); FileOutputStream out = new FileOutputStream(dest); // 臨時快取 byte[] b = new byte[1024]; int len = -1; // 檔案複製 while ((len = in.read(b)) != -1) { out.write(b, 0, len); } // 關流 in.close(); out.close(); // 返回提示資訊 this.addActionMessage("檔案上傳成功!"); return SUCCESS; } }
//下載Action public class DownloadAction extends ActionSupport { private int id; private String fileName; public String getFileName() { return fileName; } public void setFileName(String fileName) { this.fileName = fileName; } public int getId() { return id; } public void setId(int id) { this.id = id; } public InputStream getInputStream(){ try { //設定下載檔名稱 fileName=URLEncoder.encode("高清無碼.avi","UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } //設定下載檔案路徑 String filepath = "upfile/aaaaa.xlsx"; return ServletActionContext.getServletContext().getResourceAsStream(filepath); } @Override public String execute() throws Exception { System.out.println(id); return SUCCESS; } }
struts.xml中的配置：
<struts>
- <!-- 配置檔案上傳上限
-->
<constant name="struts.multipart.maxSize" value="10000000" />
- <!-- 使用國際化配置
-->
<constant name="struts.custom.i18n.resources" value="res" />
- <package name="testpack" extends="struts-default" namespace="/">
- <action name="upfile" class="com.web.action.UpfileAction">
<result>/index.jsp</result>
<result name="input">/index.jsp</result>
- <!-- 新增攔截器實現檔案上傳限制
-->
- <interceptor-ref name="defaultStack">
- <!-- 檔案大小，單位位元組
-->
<param name="fileUpload.maximumSize">1000000</param>
- <!-- 檔案型別
-->
- <!-- <param name="fileUpload.allowedTypes">text/plain,application/vnd.ms-excel</param>
-->
- <!-- 檔案字尾
-->
<param name="fileUpload.allowedExtensions">.txt,.xls</param>
</interceptor-ref>
</action>
- <action name="download" class="com.web.action.DownloadAction">
- <!-- 檔案下載時result標籤的type屬性設定成stream
-->
- <result type="stream">
- <!-- 配置下載檔案型別
-->
<param name="contentType">application/octet-stream</param>
- <!-- 下載檔名稱
-->
<param name="contentDisposition">attachment;filename="${fileName}"</param>
- <!-- *下載檔案流物件
-->
<param name="inputName">inputStream</param>
- <!-- 檔案大小
-->
<param name="bufferSize">2048</param>
- <!-- 設定是否快取
-->
<param name="allowCaching">false</param>
- <!-- 字元編碼
-->
<param name="contentCharSet">UTF-8</param>
</result>
</action>
</package>
</struts>JSP頁面中的配置：
引入struts2標籤
<%@ taglib uri="/struts-tags" prefix="s" %>
<body>
<s:actionerror/> //錯誤提示
<s:actionmessage/>
<s:form action="upfile" method="post" namespace="/" enctype="multipart/form-data">
<s:textfield name="txt" label="標題"></s:textfield>
<s:file name="file" label="檔案上傳"></s:file>
<s:submit value="提交"></s:submit>
</s:form>
</body>
//下載JSP頁面
<body>
<a href="download?id=100001">下載</a>
</body>