SSH框架开发通过common-fileupload组件实现上传下载

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strut2,spring2.5
jsp端
<input type="file" name="txtFile" />form里属性enctype="multipart/form-data"action extends ActionSupport,里面设置2个属性,上面的input的name是txtFile,
则此input必须在action里声明两个变量txtFile类型File,txtFileFileName类型String,
为这两个变量添加get,set方法然后即可在action的execute方法中
File newFile = new File("XXX");
上传来的文件名是一长串+tmp,因此file控件自己会另外传个FileName上来,就是那个txtFileFileName
//copy from txtFile to newFile

package updown.action;import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.List;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
import org.apache.struts.upload.FormFile;import updown.domain.UpDown;
import updown.form.UploadForm;
import updown.service.UpDownService;public class UpDownAction extends DispatchAction {
        private UpDownService upDownService;        public void setUpDownService(UpDownService upDownService) {
                this.upDownService = upDownService;
        }        // 显示下载页面
        public ActionForward show(ActionMapping mapping, ActionForm form,
                        HttpServletRequest request, HttpServletResponse response)
                        throws Exception {
                List<UpDown> upDownList = upDownService.getAllUpDown();
                request.setAttribute("upDownList", upDownList);
                return mapping.findForward("success");
        }        // 转到上传页面
        public ActionForward toUpload(ActionMapping mapping, ActionForm form,
                        HttpServletRequest request, HttpServletResponse response)
                        throws Exception {
                return mapping.findForward("success");        }        // 上传文件
        public ActionForward upload(ActionMapping mapping, ActionForm form,
                        HttpServletRequest request, HttpServletResponse response)
                        throws Exception {                UploadForm uploadForm = (UploadForm) form;
                FormFile file = uploadForm.getMyFile();
                FileOutputStream fos = null;
                String realPath = null;
                try {
                        String name = file.getFileName();
                        byte[] fileData = file.getFileData();                        // 获得upfile目录的绝对路径
                        // ServletContext sc = this.getServlet().getServletContext();
                        // String realPath = sc.getRealPath("/xxx/");//webapp路径                        realPath = new File("\\.").getCanonicalFile().toString();// 得到当前磁盘路径                        fos = new FileOutputStream(realPath + "/" + name);
                        fos.write(fileData);
                } catch (Exception e) {
                        e.printStackTrace();
                } finally {
                        try {
                                fos.flush();
                                fos.close();
                        } catch (IOException e) {
                                e.printStackTrace();
                        }
                }                UpDown upDown = new UpDown();
                upDown.setName(file.getFileName());
                upDown.setPath(realPath);
                upDownService.saveUpDown(upDown);                return mapping.findForward("success");
        }        // 下载文件
        public ActionForward download(ActionMapping mapping, ActionForm form,
                        HttpServletRequest request, HttpServletResponse response)
                        throws Exception {
                Integer id = new Integer(request.getParameter("id"));// 根据id下载文件
                UpDown upDown = upDownService.getUpDown(id);                String fileName = upDown.getName();                File file = new File(upDown.getPath() + "/" + fileName);// 下载路径                InputStream is = new FileInputStream(file);
                OutputStream os = response.getOutputStream();
                BufferedInputStream bis = new BufferedInputStream(is);
                BufferedOutputStream bos = new BufferedOutputStream(os);                response.reset();
                response.setCharacterEncoding("UTF-8");
                response.setContentType("application/x-msdownload");// 下载属性
                response.setHeader("Content-Disposition", "attachment;filename="
                                + URLEncoder.encode(upDown.getName(), "utf-8"));// 下载的文件名转换成utf-8                int bytesRead = 0;
                byte[] buffer = new byte[1024 * 8];
                while ((bytesRead = bis.read(buffer)) != -1) {
                        bos.write(buffer, 0, bytesRead);
                }                bos.flush();
                bis.close();
                bos.close();
                is.close();
                os.close();                return null;
        }}package updown.dao;import java.util.List;import updown.domain.UpDown;
public interface UpDownDao {
        public UpDown findById(Integer id);        public void save(UpDown upDown);        public List<UpDown> findAll();}
package updown.dao.impl;import java.util.List;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import org.springframework.orm.hibernate3.HibernateTemplate;import updown.dao.UpDownDao;
import updown.domain.UpDown;
import updown.service.UpDownService;public class UpDownDaoImpl implements UpDownDao {
        protected HibernateTemplate hibernate;        public void setHibernate(HibernateTemplate hibernate) {
                this.hibernate = hibernate;
        }        public UpDown findById(Integer id) {
                String hql = "from UpDown ud where ud.id=?";
                List<UpDown> list = hibernate.find(hql, new Object[] { id });
                if (list == null || list.size() == 0)
                        return null;
                return list.get(0);
        }        public List<UpDown> findAll() {
                String hql = "from UpDown";
                List<UpDown> list = hibernate.find(hql);
                return list;
        }        public void save(UpDown upDown) {
                hibernate.save(upDown);
        }
}
package updown.domain;import java.io.Serializable;public class UpDown implements Serializable {
        private static final long serialVersionUID = 1L;        private Integer id;
        private String name;
        private String path;        public Integer getId() {
                return id;
        }        public void setId(Integer id) {
                this.id = id;
        }        public String getName() {
                return name;
        }        public void setName(String name) {
                this.name = name;
        }        public String getPath() {
                return path;
        }        public void setPath(String path) {
                this.path = path;
        }}
package updown.form;import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;public class UploadForm extends ActionForm {
        private static final long serialVersionUID = 1L;        private FormFile myFile;//myFile必须与jsp中的一样        public FormFile getMyFile() {
                return myFile;
        }        public void setMyFile(FormFile myFile) {
                this.myFile = myFile;
        }}package updown.service;import java.util.List;import updown.domain.UpDown;public interface UpDownService {
        public void saveUpDown(UpDown upDown);        public List<UpDown> getAllUpDown();        public UpDown getUpDown(Integer id);}
package updown.service.impl;import java.util.List;import updown.dao.UpDownDao;
import updown.domain.UpDown;
import updown.service.UpDownService;public class UpDownServiceImpl implements UpDownService {
        private UpDownDao upDownDao;        public void setUpDownDao(UpDownDao upDownDao) {
                this.upDownDao = upDownDao;
        }        public List<UpDown> getAllUpDown() {
                return upDownDao.findAll();
        }        public UpDown getUpDown(Integer id) {
                return upDownDao.findById(id);
        }        public void saveUpDown(UpDown upDown) {
                upDownDao.save(upDown);
        }}

Hashtable uploadFiles=ef.getMultipartRequestHandler().getFileElements();         if(uploadFiles.size()>0){
            Enumeration fk=uploadFiles.keys();
            while(fk.hasMoreElements()){
              String fname=(String)fk.nextElement();
              FormFile ff=(FormFile)uploadFiles.get(fname);
              //接下来知道了,不过每个 <input type=file name要不一样  >这个如果是动态添加的话用JS容易，否则你固定上传几个就定义几个，上传过程要判断下文件大小，因为有的文件选择框，没有选中文件会报错。
ff.getInputStream输入流，其它不用说了吧。
            }
        }
这是Struts1的上传，当然表单要设置enctype="multipart/form-data"

调试易

SSH框架开发通过common-fileupload组件实现上传下载

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