JSP上传文件的好例子

package com.hy.test.action; import org.apache.struts.action.ActionMapping; import org.apache.struts.action.ActionForm; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.ActionForward; import com.hy.test.form.ActFm_file; import org.apache.struts.action.Action; import org.apache.struts.upload.*; import java.io.*; //处理文件上传 public class Act_file extends Action { public ActionForward execute(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) { ActFm_file actFm_file = (ActFm_file) actionForm; // String dir = this.servlet.getServletContext().getRealPath("img"); // System.out.println(" dir = "+ dir ); //得到 ActionForm 中的 FormFile FormFile ff = actFm_file.getFile(); //判断是否为空，没有找到文件，这里为空 if( ff == null ) { System.out.println(" 文件没有找到！"); //没有找到上传得文件，跳到 error 页面 return actionMapping.findForward("error"); } //取得要上传得文件的名称 String fname= ff.getFileName(); //取得要上传得文件的大小 int isize = ff.getFileSize(); String size = Integer.toString( isize ); try { //得到要上传文件的输入流 InputStream is = ff.getInputStream(); //建立输入文件的路径 File f = new File( "f:\\"+fname ); if( !f.exists()) f.createNewFile(); //建立输出流 OutputStream os = new FileOutputStream( f ); //读上传文件，写入输出文件 int bytesRead = 0; byte[] buffer = new byte[isize]; while ((bytesRead = is.read(buffer, 0, isize)) != -1) { os.write(buffer, 0, bytesRead); } os.close(); is.close(); } catch ( Exception ex) { System.out.println(" 输入，输出流异常!"); return actionMapping.findForward("error"); } actFm_file.setFname( fname); actFm_file.setSize( size ); ff.destroy(); return actionMapping.findForward("success"); } }