update.java

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package Servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import Bean.Db;

public class update extends HttpServlet {

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html; charset=gb2312");
		
		PrintWriter out = response.getWriter();
		String studentId=request.getParameter("studentId");
		String studentName=request.getParameter("studentName");
		String studentSex=request.getParameter("studentSex");
		String studentClass=request.getParameter("studentClass");
		studentSex=new String(studentSex.getBytes("iso8859-1"),"gb2312");
		studentName=new String(studentName.getBytes("iso8859-1"),"gb2312");
		studentClass=new String(studentClass.getBytes("iso8859-1"),"gb2312");
		String sql = "update student set studentName='" + studentName
				+ "',studentSex='" + studentSex + "',studentClass='"
				+ studentClass + "' where studentId='" + studentId + "'";
		System.out.println(sql);
		try
		{
			Db db=new Db();
			db.executeUpdate(sql);
		}
		catch(Exception e)
		{
			
		}
		RequestDispatcher rd=request.getRequestDispatcher("query");
		rd.forward(request, response);
		
		
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}