Struts2文件上传之Servlet依赖fileupload组件实现

来源：互联网发布：移动和大数据编辑：程序博客网时间：2024/06/05 08:00

直接贴代码

upload.jsp

<body><form action="/struts/UploadServlet" method="post" enctype="multipart/form-data">username:<input type="text" name="username"><br>password:<input type="password" name="password"><br>file1:<input type="file" name="file1"><br>file2:<input type="file" name="file2"><br><input type="submit" name="submit" value="submit"></form></body>

package cn.com.baiwen.servlet;import java.io.File;import java.io.IOException;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class UploadServlet extends HttpServlet {public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {/** * 文件上传分为2中形式 * 1.文件如果很小，只有几十个细节或者几百个字节，将字节放置到内存当中， * 然后再从内存输出到磁盘上；（至于多少字节为标准，是可以手动指定的， * 比如下面的DiskFileItemFactory，其中的参数sizeThreshold则为设置该值，默认为10240） * 2.文件超超过设定的值，比较大的文件，则会在磁盘上面创建临时目录，将文件先保存到临时目录， * 然后通过IO的方式写到指定磁盘目录 */DiskFileItemFactory factory = new DiskFileItemFactory();@SuppressWarnings("deprecation")String pathname = request.getRealPath("/upload");factory.setRepository(new File(pathname));factory.setSizeThreshold(1024 * 1024);ServletFileUpload upload = new ServletFileUpload(factory);//这里就是中文文件名处理的代码，其实只有一行，setHeaderEncoding就可以了upload.setHeaderEncoding("utf-8");try {//解析request中所有的参数，得到FileItem集合List<FileItem> list = upload.parseRequest(request);/** * FileItem中数据只分为2种： * file类型和非file类型 * 如果isFormField则为非file类型 */for(FileItem item : list){if(item.isFormField()){String name = item.getFieldName();String value = item.getString("utf-8");request.setAttribute(name, value);}else{String name = item.getFieldName();String fileName = item.getName();fileName = fileName.substring(fileName.lastIndexOf("\\")+1);request.setAttribute(name, fileName);//将文件写入到指定目录item.write(new File(pathname, fileName));}}} catch (Exception e) {e.printStackTrace();}request.getRequestDispatcher("upload/result.jsp").forward(request, response);}}

result.jsp

  <body>  username:${username }<br>  password:${password }<br>  file1:${file1 }<br>  file2:${file2}    </body>

web.xml

<servlet><servlet-name>UploadServlet</servlet-name><servlet-class>cn.com.baiwen.servlet.UploadServlet</servlet-class></servlet><servlet-mapping><servlet-name>UploadServlet</servlet-name><url-pattern>/UploadServlet</url-pattern></servlet-mapping>

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