一个jsp小例子-广告系统

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package servlet.control; import beans.*; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.io.RandomAccessFile; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; import javax.servlet.RequestDispatcher; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; /** * * @author Administrator */ public class HandleUpload extends HttpServlet { /** * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods. * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override public void init(ServletConfig config)throws ServletException { super.init(config); try{ Class.forName("org.apache.derby.jdbc.ClientDriver"); } catch(Exception e){} } public void uploadFileMethod(HttpServletRequest request,HttpServletResponse response,String logname) throws ServletException,IOException{ response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); UploadFile upFile=new UploadFile(); String backNews=""; try { HttpSession session=request.getSession(true); request.setAttribute("upFile", upFile); String tempFileName=(String)session.getId(); File f1=new File(tempFileName); FileOutputStream o=new FileOutputStream(f1); InputStream in=request.getInputStream(); byte b[]=new byte[10000]; int n; while((n=in.read(b))!=-1) { o.write(b, 0, n); } o.close(); in.close(); RandomAccessFile random=new RandomAccessFile(f1,"r"); int second=1; String secondLine=null; while(second<=2) { secondLine=random.readLine(); second++; } int position=secondLine.lastIndexOf('\\'); String fileName=secondLine.substring(position+1, secondLine.length()-1); byte cc[]=fileName.getBytes("ISO-8859-1"); fileName=new String(cc); fileName=fileName.replaceAll(" ",""); String checkedStr=fileName.substring(0, fileName.indexOf(".")); boolean isLetterOrDigit=true; for(int i=0;i<checkedStr.length();i++) { char c=checkedStr.charAt(i); if(!((c<='z'&&c>='a')||(c<='Z'&&c>='A')||(c<='9'&&c>='0'))) { isLetterOrDigit=false; break; } } if(isLetterOrDigit==false) { response.sendRedirect("upload.jsp"); } String savedFileName=logname.concat(fileName); random.seek(0); long forthEndPosition=0; int forth=1; while((n=random.readByte())!=-1&&(forth<=4)) { if(n=='\n') { forthEndPosition=random.getFilePointer(); forth++; } } File dir=new File("C:/Documents and Settings/Administrator/My Documents/NetBeansProjects/net_advertise_system/web/imag"); dir.mkdir(); File file[]=dir.listFiles(); for(int k=0;k<file.length;k++) { if(file[k].getName().startsWith(logname)) file[k].delete(); } File savingFile=new File(dir,savedFileName); RandomAccessFile random2=new RandomAccessFile(savingFile,"rw"); random.seek(random.length()); long endPosition=random.getFilePointer(); long mark=endPosition; int j=1; while((mark>=0)&&(j<=6)) { mark--; random.seek(mark); n=random.readByte(); if(n=='\n') { endPosition=random.getFilePointer(); j++; } } random.seek(forthEndPosition); long startPoint=random.getFilePointer(); while(startPoint<endPosition-1) { n=random.readByte(); random2.write(n); startPoint=random.getFilePointer(); } random2.close(); random.close(); String uri="jdbc:derby://localhost:1527/net_adv-db"; Connection con=DriverManager.getConnection(uri, "net", "adv"); Statement sql=con.createStatement(); ResultSet rs=sql.executeQuery("select* from member where logname='"+logname+"'"); if(rs.next()) { if(isLetterOrDigit) { int mm=sql.executeUpdate("UPDATE member SET pic='"+savedFileName+"' where logname='"+logname+"'"); if(mm!=0) { backNews=fileName+"成功上传"; upFile.setFileName(fileName); upFile.setSavedFileName(savedFileName); upFile.setBackNewse(backNews); } } } con.close(); f1.delete(); } catch (Exception ex){ backNews=""+ex; upFile.setBackNewse(backNews); } RequestDispatcher dispatcher=request.getRequestDispatcher("showUploadMess.jsp"); dispatcher.forward(request, response); } protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); HttpSession session=request.getSession(true); login Login=(login)session.getAttribute("login"); boolean ok=true; if(Login==null) { ok=false; response.sendRedirect("login.jsp"); } if(ok==true) { String logname=Login.getLogname(); uploadFileMethod(request,response,logname); } try { } finally { out.close(); } } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } @Override public String getServletInfo() { return "Short description"; } }