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文件上传、下载 -- 网络云盘案例
package cn.gudan.yunpan.web.servlet;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.OutputStream;import java.net.URLEncoder;import java.sql.SQLException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import sun.misc.BASE64Encoder;import cn.gudan.yunpan.domain.Resource;import cn.gudan.yunpan.service.ResourceService;public class FileDownLoadServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String idStr = request.getParameter("id"); idStr = new String(idStr.getBytes("iso-8859-1"),"utf-8"); //获取文件id int id = Integer.parseInt(idStr); try { //通过文件id从数据库获取其他信息 ResourceService service = new ResourceService(); Resource resource = service.findResource(id); File file = new File(resource.getSavepath(),resource.getUuidname()); //判断文件是否存在 if(file.isFile()){ //文件存在 //获取文件名称 String filename = resource.getRealname(); //设置请求头信息 response.setContentType(this.getServletContext().getMimeType(filename)); //获取浏览器版本 /* 2.设置一个响应头，设置后的效果，就是无论返回的是否可以被浏览器解析，就是下载 。 response.setHeader("content-disposition","attachment;filename=下载文件名称"); */ String agent = request.getHeader("User-agent"); //处理浏览器乱码问题 if (agent.contains("MSIE")) { // IE浏览器 filename = URLEncoder.encode(filename, "utf-8"); } else if (agent.contains("Firefox")) { // 火狐浏览器 BASE64Encoder base64Encoder = new BASE64Encoder(); filename = "=?utf-8?B?"+base64Encoder.encode(filename.getBytes("utf-8"))+"?="; } else if (agent.contains("Chrome")) { // google浏览器 filename = URLEncoder.encode(filename, "utf-8"); } else { // 其它浏览器 filename = URLEncoder.encode(filename, "utf-8"); } //设置请求头信息 response.setHeader("Content-Disposition", "attachment;filename=" + filename); OutputStream os = response.getOutputStream(); FileInputStream fis = new FileInputStream(file); byte[] b = new byte[1024*10]; int len = -1; while((len = fis.read(b))!=-1){ os.write(b, 0, len); os.flush(); } fis.close(); } } catch (SQLException e) { e.printStackTrace(); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); }}
package cn.gudan.yunpan.web.servlet;import java.io.IOException;import java.sql.SQLException;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import cn.gudan.yunpan.domain.Resource;import cn.gudan.yunpan.service.ResourceService;public class FileShow extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ResourceService service = new ResourceService(); try { List<Resource> resourceList = service.showFile(); if(resourceList!=null){ request.setAttribute("resourceList", resourceList); request.getRequestDispatcher("/download.jsp").forward(request, response); return; } request.setAttribute("msg", "没有文件信息"); request.getRequestDispatcher("/download.jsp").forward(request, response); } catch (SQLException e) { response.setContentType("text/html;charset=utf-8"); response.getWriter().write("查询失败"); e.printStackTrace(); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); }}
package cn.gudan.yunpan.web.servlet;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.lang.reflect.InvocationTargetException;import java.sql.SQLException;import java.sql.Timestamp;import java.text.SimpleDateFormat;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.beanutils.BeanUtils;import org.apache.commons.beanutils.ConvertUtils;import org.apache.commons.beanutils.converters.DateConverter;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.apache.commons.io.IOUtils;import cn.gudan.yunpan.domain.Resource;import cn.gudan.yunpan.service.ResourceService;import cn.gudan.yunpan.utils.ResourceUtils;public class FileUpLoadServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { /* *Map<String, String[]> map = request.getParameterMap(); * request对象获取的map集合是不可变的。不能修改。 * 只能自定义一个map集合 */ Map<String, String[]> map = new HashMap<String, String[]>(); DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); //boolean flag = upload.isMultipartContent(request); //这两个方法是一样的效果。 //判断请求是不是文件上传请求，相当于判断 encType="multipart/form-data" boolean flag = ServletFileUpload.isMultipartContent(request); if(flag){ try { //设置文件名称的编码 upload.setHeaderEncoding("utf-8"); //获取组件集合 List<FileItem> parseRequest = upload.parseRequest(request); //遍历组件 for (FileItem fileItem : parseRequest) { //判断组件是不是文件上传组件 if(fileItem.isFormField()){ //不是文件上传组件 //获取name组件属性：description String fieldName = fileItem.getFieldName(); //添加到map集合 map.put(fieldName, new String[]{fileItem.getString("utf-8")}); }else{ //是文件上传组件 //获取文件名称，因为浏览器不同，有的浏览器是全路径，所以需要截取 String filename = fileItem.getName(); filename = filename.substring(filename.lastIndexOf("\\")+1); //获取UUID名称 String uuidFileName = ResourceUtils.getUUIDFileName(filename); //获取文件存储路径 String randomDirectory = this.getServletContext().getRealPath("WEB-INF/upload")+ResourceUtils.getRandomDirectory(filename); //根据目录创建File File directory = new File(randomDirectory); //如果目录不存在，则创建目录 if(!directory.exists()){ //只能创建单层目录 //directory.mkdir(); //可以创建多重目录 directory.mkdirs(); } //创建全路径及文件名的File //new File()的参数可以是字符串，也可以是File对象，也可以两者组合 File file = new File(directory,uuidFileName); //保存文件 IOUtils.copy(fileItem.getInputStream(), new FileOutputStream(file)); //删除临时文件 fileItem.delete(); //将属性封装到map集合 map.put("uuidname", new String[] { uuidFileName }); map.put("realname", new String[] { filename }); map.put("savepath", new String[] { randomDirectory }); } } /* 使用javaBean将属性封装到对象中 */ Resource resource = new Resource(); BeanUtils.populate(resource, map); //将记录存储到数据库中 ResourceService service = new ResourceService(); service.save(resource); } catch (FileUploadException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); } } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); }}
package cn.gudan.yunpan.service;import java.sql.SQLException;import java.util.List;import cn.gudan.yunpan.dao.ResourceDao;import cn.gudan.yunpan.domain.Resource;public class ResourceService { public void save(Resource resource) throws SQLException { new ResourceDao().save(resource); } public List<Resource> showFile() throws SQLException { return new ResourceDao().showFile(); } public Resource findResource(int id) throws SQLException { return new ResourceDao().findResource(id); }}
package cn.gudan.yunpan.service;import java.sql.SQLException;import java.util.List;import cn.gudan.yunpan.dao.ResourceDao;import cn.gudan.yunpan.domain.Resource;public class ResourceService { public void save(Resource resource) throws SQLException { new ResourceDao().save(resource); } public List<Resource> showFile() throws SQLException { return new ResourceDao().showFile(); } public Resource findResource(int id) throws SQLException { return new ResourceDao().findResource(id); }}
文件上传、下载 -- 网络云盘案例
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