📄 addpageservlet.java
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package UI;
import javax.servlet.*;
import javax.servlet.http.*;
import date.*;
import java.io.*;
import java.util.*;
public class AddPageServlet extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=GBK";
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();
HttpSession session=request.getSession();
String message="";
Vector metaData=null;
DateBean father; //超类
if(session.getAttribute("what").equals("User"))
father=(DateBean)session.getAttribute("User");
else
father=(DateBean)session.getAttribute("Book");
message=father.getMessage();
metaData=father.getMetaData(); //用于生成HTML表单
response.setContentType("text/html");
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.println("<form method='post' action='" + request.getRequestURI() + "'>");
out.println("<table"+" "+"align="+"'center'"+">");
out.println("请填入增加信息:");
if(message!=""){
out.println("<center><font color=");
out.println("'red'>");
out.println(message);
out.println("</font></center>");
}
try{
int len=metaData.size();
for(int i=0;i<len;i++){
out.println(" <tr>");
out.println(" <td align="+"'right'"+">"+metaData.elementAt(i)+":"+"</td>");
out.println(" <td>"+"<input name="+metaData.elementAt(i)+">"+"</td>");
out.println(" </tr>");
}
}
catch(NoSuchElementException ee){
ee.toString();
}
out.println("<tr>");
out.println(" <td align="+"'center'"+" "+"colspan=2>");
out.println(" <input type=submit name="+"'login'"+" "+"value="+"确定"+">");
out.println(" <input type=reset name="+"'reset'"+" "+"value="+"重填"+">");
out.println(" </td>");
out.println(" </tr>");
out.println(" </table>");
out.println("</form>");
out.println("</BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
request.setCharacterEncoding("GB2312");
HttpSession session=request.getSession();
DateBean father=null; //超类
if(session.getAttribute("what").equals("User"))
father=(DateBean)session.getAttribute("User");
else
father=(DateBean)session.getAttribute("Book");
Vector v=new Vector(); //用于保存用户输入的值
Vector metaData=father.getMetaData();
int len=metaData.size();
String temp="";
String bb="";
for(int i=0;i<len;i++){
bb=(String)metaData.elementAt(i);
temp=request.getParameter(bb);
v.add(temp);
}
father.setMetaDataValue(v); //保存刚才输入的值
session.setAttribute("AddPageValue",father);
session.setAttribute("page","add");
//request.setAttribute("AddPageValue",father);
//request.setAttribute("page","add"); //标识是从ADD页面来的请求
request.getRequestDispatcher("/actionServlet").forward(request,response);
}
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