java 上传下载文件
import java.io.FileInputStream;import java.io.OutputStream;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class FileDownload extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response) {try {String fname = "test.xls";response.setCharacterEncoding("UTF-8");fname = java.net.URLEncoder.encode(fname, "UTF-8");response.setHeader("Content-Disposition", "attachment; filename="+fname);response.setContentType("application/msexcel");// 定义输出类型} catch (Exception e) {System.out.println(e);}}}//上面是下载用的servlet[code=Java]import java.io.File;import java.io.IOException;import java.io.PrintWriter;import java.util.Iterator;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.FileItemFactory;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class FileUpload extends HttpServlet {public void doPost(HttpServletRequest request, HttpServletResponse response)throws IOException, ServletException {boolean isMultipart = ServletFileUpload.isMultipartContent(request);if (isMultipart) {FileItemFactory factory = new DiskFileItemFactory();ServletFileUpload upload = new ServletFileUpload(factory);Iterator items;try {items = upload.parseRequest(request).iterator();while (items.hasNext()) {FileItem item = (FileItem) items.next();if (!item.isFormField()) {//取出上传文件的文件名称String name = item.getName(); String fileName = name.substring(name.lastIndexOf('\\')+1,name.length());String path = request.getRealPath("file")+File.separatorChar+fileName;//上传文件File uploadedFile = new File(path);item.write(uploadedFile); //打印上传成功信息response.setContentType("text/html");response.setCharacterEncoding("gb2312");PrintWriter out = response.getWriter();out.print("<font size='2'>上传的文件为："+name+"<br>");out.print("保存的地址为："+path+"</font>");}}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}