1.这次我在<青年志愿服务网>的项目的基础上，对信息的多功能查询进行说明和学习
在上节博客中的基础上增加了VagueServlet.java:在我更改版本时，中文注释出现了乱码。
package com.servlet; import java.io.IOException; import java.util.ArrayList; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.bean.Bean; import com.dao.Dao; /** * Servlet implementation class VagueServlet */ @WebServlet("/VagueServlet") public class VagueServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public VagueServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); Dao dao=new Dao(); java.util.List<Bean> list= new ArrayList<Bean>(); String p[] = new String[5]; String s[] = new String[5]; String g[] = new String[5]; String f[] = new String[5]; String number = null; //String number1 = null; number=request.getParameter("number1"); //number1=request.getParameter("number2"); int n = Integer.parseInt(number);//鎺ユ敹鏉′欢鐨勪釜鏁? System.out.println("鏉′欢鏁?"+n); for(int i=1;i<=n;i++) { p[i]= (String) request.getParameter("s"+i); s[i]=(String)request.getParameter("shuru"+i); f[i]=(String)request.getParameter("c"+i); System.out.println("绮剧‘杩樻槸妯＄硦"+f[i]); System.out.println("鏉′欢"+p[i]); System.out.println("杈撳叆"+s[i]); if(p[i].equals("鍚嶅瓧")){ p[i] = "name"; }else if(p[i].equals("姓名")){ p[i] = "sex"; }else if(p[i].equals("民族")){ p[i] = "nation"; }else if(p[i].equals("时间")){ p[i] = "time"; }else if(p[i].equals("年龄")){ p[i] = "age"; } } for(int i=1;i<n;i++) { g[i]=(String) request.getParameter("g"+i); if(g[i].equals("涓?")) { g[i]="and"; }else if(g[i].equals("鎴?")) { g[i]="or"; } System.out.println("涓旀垨"+g[i]); } String sql="where "; for(int i=1;i<n;i++) { if(s[i].equals("")) { continue; } if(f[i].equals("绮剧‘")) { sql=sql+p[i]+"=‘"+s[i]+"‘"+" "+g[i]+" "; }else if(f[i].equals("妯＄硦")) { sql=sql+p[i]+" "+"LIKE"+" "+"‘%"+s[i]+"%‘"+" "+g[i]+" "; } } if(f[n].equals("绮剧‘")) { sql = sql + p[n]+"="+"‘"+s[n]+"‘"; }else { sql = sql + p[n]+" "+"LIKE"+" "+"‘%"+s[n]+"%‘"; } // } if(n==1&&s[1].equals("")) { System.out.println("浠?涔堜篃娌′紶锛?"); sql=""; } list = dao.loadview(sql); if(list.size()!=0) { request.setAttribute("course11",list); request.setAttribute("message", "查找成功"); System.out.print("鏌ヨ 鎴愬姛"); request.getRequestDispatcher("selectmore_show.jsp").forward(request,response); } else { request.setAttribute("message", "查找失败"); request.getRequestDispatcher("select.jsp").forward(request,response); } // HttpSession session = request.getSession(); // session.setAttribute("tiaojian", list); //// int servletid=1; //// request.setAttribute("list", list); //// request.setAttribute("servletid", servletid); // try { //// request.getRequestDispatcher("/admin/123.jsp").forward(request, response); // response.sendRedirect(request.getContextPath()+"/show.jsp"); // } catch (IOException e) { // // TODO 远 傻 catch // e.printStackTrace(); // } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
select.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>查询页面</title> <script> var i=1; var j=1; document.getElementById(‘number1‘).value=i; document.getElementById(‘number2‘).value=j; function demoDisplay(){ if(document.getElementById("p2").style.display=="none"){ i++; j++; document.getElementById("p2").style.display="inline"; document.getElementById(‘number1‘).value=i; document.getElementById(‘number2‘).value=j; // alert(i); // alert(j); return; }else if(document.getElementById("p3").style.display=="none") { i++; j++; document.getElementById("p3").style.display="inline"; document.getElementById(‘number1‘).value=i; document.getElementById(‘number2‘).value=j; // alert(i); // alert(j); return; }else if(document.getElementById("p4").style.display=="none") { i++; j++; document.getElementById("p4").style.display="inline"; document.getElementById(‘number1‘).value=i; document.getElementById(‘number2‘).value=j; // alert(i); // alert(j); return; }else if(document.getElementById("p5").style.display=="none") { i++; j++; document.getElementById("p5").style.display="inline"; document.getElementById(‘number1‘).value=i; document.getElementById(‘number2‘).value=j; // alert(i); // alert(j); return; } } function demoVisibility(){ if(document.getElementById("p5").style.display=="inline") { i--; j--; document.getElementById("p5").style.display="none"; document.getElementById(‘number1‘).value=i; document.getElementById(‘number2‘).value=j; //System.out.println("i:"+i+"j"+j); return; }else if(document.getElementById("p4").style.display=="inline") { i--; j--; document.getElementById("p4").style.display="none"; document.getElementById(‘number1‘).value=i; document.getElementById(‘number2‘).value=j; //System.out.println("i:"+i+"j"+j); return; }else if(document.getElementById("p3").style.display=="inline") { i--; j--; document.getElementById("p3").style.display="none"; document.getElementById(‘number1‘).value=i; document.getElementById(‘number2‘).value=j; //System.out.println("i:"+i+"j"+j); return; }else if(document.getElementById("p2").style.display=="inline") { i--; j--; document.getElementById("p2").style.display="none"; document.getElementById(‘number1‘).value=i; document.getElementById(‘number2‘).value=j; //System.out.println("i:"+i+"j"+j); return; } } </script> </head> <body> <% Object message=request.getAttribute("message"); if(message!=null&&!"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%}%> <form action="VagueServlet" method="post"> <br> <button type="button" onclick="demoDisplay()" class="layui-btn layui-btn-primary layui-btn-sm"><i class="layui-icon">+</i></button> <button type="button" onclick="demoVisibility()" class="layui-btn layui-btn-primary layui-btn-sm"><i class="layui-icon">-</i></button><br> <div id="p1"> <select name="g22" style="visibility:hidden"> <option value="且">且</option> <option value="或">或</option> </select> <select name="s1" > <option>名字</option> <option>性别</option> <option>民族</option> <option>注册日期</option> <option>年龄</option> </select> <input type="text" name="shuru1" value="" /> <select name="c1"> <option>精确</option> <option>模糊</option> </select> <br> </div> <div id="p2" style="display:none"> <select name="g1" > <option value="且">且</option> <option value="或">或</option> </select> <select name="s2"> <option>名字</option> <option>性别</option> <option>民族</option> <option>注册日期</option> <option>年龄</option> </select> <input type="text" name="shuru2" value="" /> <select name="c2"> <option>精确</option> <option>模糊</option> </select> <br> </div> <div id="p3" style="display:none"> <select name="g2"> <option value="且">且</option> <option value="或">或</option> </select> <select name="s3"> <option>名字</option> <option>性别</option> <option>民族</option> <option>注册日期</option> <option>年龄</option> </select> <input type="text" name="shuru3" value="" /> <select name="c3"> <option>精确</option> <option>模糊</option> </select> <br> </div> <div id="p4" style="display:none"> <select name="g3"> <option value="且">且</option> <option value="或">或</option> </select> <select name="s4"> <option>名字</option> <option>性别</option> <option>民族</option> <option>注册日期</option> <option>年龄</option> </select> <input type="text" name="shuru4" value="" /> <select name="c4"> <option>精确</option> <option>模糊</option> </select> <br> </div> <div id="p5" style="display:none"> <select name="g4"> <option value="且">且</option> <option value="或">或</option> </select> <select name="s5"> <option>名字</option> <option>性别</option> <option>民族</option> <option>注册日期</option> <option>年龄</option> </select> <input type="text" name="shuru5" value="" /> <select name="c5"> <option>精确</option> <option>模糊</option> </select> </div> <p hidden> <input type="text" value="1" id="number1" name="number1"> <input type="text" value="1" id="number2" name="number2"> </p> <br> <input type="submit" name="submit" value="查询" > </form> <br> <h4 align="left"> <%-- 一共查询到了<span style="color:red"><%=list.size() %></span>条数据 --%> </h4> <table class="table table-striped"> <thead> <tr> <th>平台编号</th> <th>平台名称</th> <th>批准年月</th> <th>平台级别</th> <th>服务的主要国民经济行业</th> <th>所属的主要学科</th> <th>状态</th> <th>操作</th> </tr> </thead> </table> </body> </html>
显示页面：（同时可以进行精确和模糊查询）
selectmore_show.jsp:
<%@ page language="java" contentType="text/html; charse=tUTF-8" pageEncoding="UTF-8"%> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>信息显示页面</title> </head> <body> <a href="denglu.jsp">返回主界面</a> <% Object message=request.getAttribute("message"); if(message!=null&&!"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%}%> <table> <tr> <td>姓名</td> <td>性别</td> <td>民族</td> <td>注册日期</td> <td>年龄</td> <td>政治面貌</td> <td>服务类别</td> </tr> <c:forEach items="${course11}" var="course1"> <tr> <td>${course1.name}</td> <td>${course1.sex}</td> <td>${course1.nation}</td> <td>${course1.time}</td> <td>${course1.age}</td> <td>${course1.kind}</td> <td>${course1.serve}</td> </tr> </c:forEach> </table> </body> </html>
最后显示查询的结果。
原文：https://www.cnblogs.com/hhjing/p/12083741.html