本文實例為大家分享了java學生寢室查詢系統(tǒng)的具體代碼,供大家參考,具體內(nèi)容如下
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前端部分:
index.html
AHPU Freshman dormitory inquiry
confrim.js:
var EventUtil={ addhandler:function(element,type,handler){ if(element.addEventListener){ element.addEventListener(type,handler,false); }else if(element.attachEvent){ element.attachEvent("on"+type,handler); }else{ element["on"+type]=handler; } }, removehandler:function(element,type,handler){ if(element.removeEventListener){ element.removeEventListener(type,handler,false); }else if(element.detachEvent){ element.detachEvent("on"+type,handler); }else{ element["on"+type]=null; } }, getEvent:function(event){ return event?event:window.event; }, getTarget:function(event){ return event.target || event.srcElement; }, preventDefault:function(event){ if(event.preventDefault){ event.preventDefault(); }else{ event.returnValue=false; } }, stopPropagation:function(event){//只能阻止事件冒泡 if(event.stopPropagation){ event.stopPropagation(); }else{ event.cancelBubble=true; } } }; function confirmName(){ if(((sname.value).trim).length!=0){ reg=/^[\u4e00-\u9fa5]{1,10}$/; if(!reg.test(sname.value)){ sname.value=""; alert("請輸入正確的姓名"); } } } function confirmSid(){ if(((sid.value).trim()).length!=0){ reg=/^([0-9]){10,10}$/; if(!reg.test(sid.value)){ sid.value=""; alert("請輸入正確的學號"); } } } function confirm(){ EventUtil.addhandler(sname,"blur",confirmName); EventUtil.addhandler(sid,"blur",confirmSid); } window.onload=function(){ var sname=document.querySelector("#sname"); var sid=document.querySelector("#sid"); var po=document.querySelector("#submit"); confirm(); EventUtil.addhandler(po,"submit",confrimName); EventUtil.addhandler(po,"submit",confrimSid); };
后端java部分:
package FindRoom; import java.io.IOException; import java.io.PrintWriter; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; //import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class findInfo extends HttpServlet { static final String JDBC_DRIVER = "com.MySQL.jdbc.Driver"; static final String DB_URL = "jdbc:mysql://localhost:3306/RoomQuery"; // 數(shù)據(jù)庫的用戶名與密碼,需要根據(jù)自己的設(shè)置 static final String USER = "root"; static final String PASS = "cd7089028"; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.log("執(zhí)行doGet方法...."); this.execute(request, response); } public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{ this.log("執(zhí)行doPost方法...."); this.execute(request,response); } //執(zhí)行方法 public void execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); response.setContentType("text/html"); PrintWriter out = response.getWriter(); //StringBuffer requestURI=request.getRequestURL(); // String method=request.getMethod(); String sname=request.getParameter("sname"); String sid=request.getParameter("sid"); response.setContentType("text/html"); //RequestDispatcher dispatcher=request.getRequestDispatcher("/RoomQuery/findInfo"); Connection conn = null; Statement stmt = null; try{ // 注冊 JDBC 驅(qū)動 Class.forName(JDBC_DRIVER); // DriverManager.registerDriver(new com.mysql.jdbc.Driver()); // 打開鏈接 System.out.println("連接數(shù)據(jù)庫..."); conn = DriverManager.getConnection(DB_URL,USER,PASS); // 執(zhí)行查詢 System.out.println(" 實例化Statement對..."); stmt = conn.createStatement(); String sql; sql = "SELECT * FROM SumRoid where SId="+sid; ResultSet rs = stmt.executeQuery(sql); // 展開結(jié)果集數(shù)據(jù)庫 while(rs.next()){ // 通過字段檢索 String flatNum=rs.getString("FlatNum"); String bedrootNum=rs.getString("BedroomNum"); String name = rs.getString("Sname"); String Sid = rs.getString("SId"); String ssex=rs.getString("Ssex"); String academy=rs.getString("academy"); String major=rs.getString("major"); // 輸出數(shù)據(jù) out.println(""); out.println("A Servlet "); out.println(""); out.println(""); out.println(""+sname+"同學歡迎你
"); out.println("公寓號:"+flatNum+"
" +"寢室號: " + bedrootNum+"
" +"姓名: " + name+"
" +"學號: " + Sid+"
" +"性別: " + ssex+"
" + "學院: " + academy+"
" +"專業(yè): " + major+"
"); } out.println(""); out.println(""); // 完成后關(guān)閉 rs.close(); stmt.close(); conn.close(); out.flush(); out.close(); }catch(SQLException se){ // 處理 JDBC 錯誤 se.printStackTrace(); }catch(Exception e){ // 處理 Class.forName 錯誤 e.printStackTrace(); }finally{ // 關(guān)閉資源 try{ if(stmt!=null) stmt.close(); }catch(SQLException se2){ }// 什么都不做 try{ if(conn!=null) conn.close(); }catch(SQLException se){ se.printStackTrace(); } } } }
數(shù)據(jù)庫mysql部分:
將excel中學生的信息存放在A盤的stu.txt文件中;
創(chuàng)建table:
3 . 將數(shù)據(jù)讀入mysql數(shù)據(jù)庫中:
load data local infile 'A:/stu.txt' into table SumRoid;
至此,一個超級簡單的查詢系統(tǒng)已完畢。
說明:
1. 在做表單輸入驗證時,bug很多;
2. jdbc的驅(qū)動一定要導入web-inf lib中;
3. web.xml配置一定要檢查好;
4. 不能預防sql注入;
以上就是本文的全部內(nèi)容,希望對大家的學習有所幫助,也希望大家多多支持創(chuàng)新互聯(lián)。