一个简单的java学生寝室查询系统
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2024-02-21 21:31:07
本文实例为大家分享了java学生寝室查询系统的具体代码，供大家参考，具体内容如下
前端部分：
index.html
...
本文实例为大家分享了java学生寝室查询系统的具体代码，供大家参考，具体内容如下
前端部分：
index.html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>ahpu freshman dormitory inquiry</title>
<script src="confirm.js"></script>
<style>
html,body{
margin:0px;
padding:0px;
}
.main{
position: relative;
width:500px;
height:500px;
background: url(image/ahpu1.jpg) no-repeat;
margin:10px auto;
}
form>div{
margin:20px 10px;
}
address{
position: absolute;
bottom:20px;
left:30px;
}
</style>
</head>
<body>
<div class="main">
<form action="findroom/findinfo" method="post" >
<div>
<label for="sname" >姓名</label>
<input type="text" name="sname" id="sname" required>
</div>
<div>
<label for="sid">学号</label>
<input type="text" name="sid" id="sid" required>
</div>
<div>
<input id="submit" type="submit">
<input id="reset" type="reset">
</div>
</form>
<address><a href="javavscript:" rel="external nofollow" >双微工作室</a></address>
</div>
</body>
</html>
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}$/;
if(!reg.test(sname.value)){
sname.value="";
alert("请输入正确的姓名");
}
}
}
function confirmsid(){
if(((sid.value).trim()).length!=0){
reg=/^([0-9]){10,10}$/;
if(!reg.test(sid.value)){
sid.value="";
alert("请输入正确的学号");
}
}
}
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";
// 数据库的用户名与密码，需要根据自己的设置
static final string user = "root";
static final string pass = "cd7089028";
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
this.log("执行doget方法....");
this.execute(request, response);
}
public void dopost(httpservletrequest request,httpservletresponse response)
throws servletexception,ioexception{
this.log("执行dopost方法....");
this.execute(request,response);
}
//执行方法
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{
// 注册 jdbc 驱动
class.forname(jdbc_driver);
// drivermanager.registerdriver(new com.mysql.jdbc.driver());
// 打开链接
system.out.println("连接数据库...");
conn = drivermanager.getconnection(db_url,user,pass);
// 执行查询
system.out.println(" 实例化statement对...");
stmt = conn.createstatement();
string sql;
sql = "select * from sumroid where sid="+sid;
resultset rs = stmt.executequery(sql);
// 展开结果集数据库
while(rs.next()){
// 通过字段检索
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");
// 输出数据
out.println("<!doctype html public \"-//w3c//dtd html 4.01 transitional//en\">");
out.println(" <head><title>a servlet</title></head>");
out.println("<html>");
out.println("<body>");
out.println("<h3>"+sname+"同学欢迎你</h3>");
out.println("<p>公寓号："+flatnum+"</p>"
+"<p>寝室号: " + bedrootnum+"</p>"
+"<p>姓名: " + name+"</p>"
+"<p>学号: " + sid+"</p>"
+"<p>性别: " + ssex+"</p>"
+ "<p>学院: " + academy+"</p>"
+"<p>专业: " + major+"</p>");
}
out.println("<body>");
out.println("</html>");
// 完成后关闭
rs.close();
stmt.close();
conn.close();
out.flush();
out.close();
}catch(sqlexception se){
// 处理 jdbc 错误
se.printstacktrace();
}catch(exception e){
// 处理 class.forname 错误
e.printstacktrace();
}finally{
// 关闭资源
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();
}
}
}
}
数据库mysql部分:
将excel中学生的信息存放在a盘的stu.txt文件中；
创建table:
复制代码 代码如下:
create table sumroid(flatnum char(10),bedroomnum char(3),sname char(10),sid char(15),ssex char(2),academy char(30),major char(20));
3 . 将数据读入mysql数据库中：
load data local infile 'a:/stu.txt' into table sumroid;
至此，一个超级简单的查询系统已完毕。
说明:
1. 在做表单输入验证时，bug很多；
2. jdbc的驱动一定要导入web-inf lib中；
3. web.xml配置一定要检查好；
4. 不能预防sql注入；
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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