src/servlet/SelectServlet.java

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package servlet;

import java.io.IOException;
import java.util.ArrayList;

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

import util.Validate;
import bean.SelectBean;

public class SelectServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public SelectServlet() {
		super();
	}

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

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		Validate vd = new Validate();
		String zonglei = vd.getUnicode(request.getParameter("zonglei"));
		String name = vd.getUnicode(request.getParameter("name"));
		String candi = vd.getUnicode(request.getParameter("candi"));
		String maxkucun = vd.getUnicode(request.getParameter("maxkucun"));
		String [] args = {"id","name","neirong","cucu","leibie"};
		String sql = "select * from wenxian";
		if(zonglei != null && !zonglei.equals("")){
			sql = sql+" where leibie='"+zonglei+"'";
		}
		if(name != null && !name.equals("")){
			sql = sql+" where name like '%"+name+"%'";
		}
		if(candi != null && !candi.equals("")){
			sql = sql+" where neirong like '%"+candi+"%'";
		}
		if(maxkucun != null && !maxkucun.equals("")){
			sql = sql+" where cucu like '%"+maxkucun+"%'";
		}
		SelectBean sb = new SelectBean();
		ArrayList al = sb.select(sql, args);
		request.setAttribute("select", al);
		RequestDispatcher rd=request.getRequestDispatcher("/caxun.jsp");
        rd.forward(request,response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)