javaeej2ee简单注册登录系统附详细源码Word文档格式.docx
- 文档编号:16066390
- 上传时间:2022-11-18
- 格式:DOCX
- 页数:16
- 大小:18.08KB
javaeej2ee简单注册登录系统附详细源码Word文档格式.docx
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456"
);
3.DBAccess.java
publicclassDBAccess{
privateStringusr="
root"
;
privateStringpwd="
"
privateConnectionconn=null;
privateStatementstm=null;
privateResultSetrs=null;
publicStringgetDrv(){
returndrv;
}
publicvoidsetDrv(Stringdrv){
this.drv=drv;
publicStringgetUrl(){
returnurl;
publicvoidsetUrl(Stringurl){
this.url=url;
publicStringgetUsr(){
returnusr;
publicvoidsetUsr(Stringusr){
this.usr=usr;
publicStringgetPwd(){
returnpwd;
publicvoidsetPwd(Stringpwd){
this.pwd=pwd;
publicConnectiongetConn(){
returnconn;
publicvoidsetConn(Connectionconn){
this.conn=conn;
returnstm;
publicvoidsetStm(Statementstm){
this.stm=stm;
returnrs;
publicvoidsetRs(ResultSetrs){
this.rs=rs;
//创建数据库连接函数
publicbooleancreateConn()
{
booleanb=false;
try{
Class.forName(drv).newInstance();
conn=(Connection)DriverManager.getConnection(url,usr,pwd);
b=true;
}catch(SQLExceptione){
}catch(ClassNotFoundExceptione){
}catch(InstantiationExceptione){
}catch(IllegalAccessExceptione){
}
returnb;
//更新sql函数
publicbooleanupdate(Stringsql)
stm=(Statement)conn.createStatement();
stm.execute(sql);
}catch(Exceptione){
//查询sql函数
publicvoidquery(Stringsql)
rs=(ResultSet)stm.executeQuery(sql);
}catch(Exceptione)
{
publicbooleannext()
if(rs.next())b=true;
catch(Exceptione)
publicStringgetValue(Stringfield)
Stringvalue=null;
try{
if(rs!
=null)value=rs.getString(field);
}catch(Exceptione)
returnvalue;
publicvoidcloseRs()
if(rs!
=null)
rs.close();
catch(SQLExceptione)
{
}
publicvoidcloseStm()
stm.close();
publicvoidcloseConn()
conn.close();
}
4.UserBean.java
package
publicclassUserBean
{
//登录验证函数
publicbooleanvalid(Stringusername,Stringpassword)
booleanisValid=false;
DBAccessdb=newDBAccess();
if(db.createConn())
Stringsql="
select*fromuserwhereusername='
+username+"
andpassword='
+password+"
db.query(sql);
if(db.next())
isValid=true;
db.closeRs();
db.closeStm();
db.closeConn();
returnisValid;
//检查用户名是否存在
publicbooleanisExist(Stringusername)
booleanisExist=false;
if(db.createConn())
Stringsql="
db.query(sql);
if(db.next())
isExist=true;
db.closeRs();
db.closeStm();
db.closeConn();
returnisExist;
publicvoidadd(Stringusername,Stringpassword,Stringemail){
insertintouser(username,password,email)values('
'
+email+"
)"
db.update(sql);
5.login_action.jsp
<
%@pagelanguage="
java"
import="
java.util.*"
pageEncoding="
ISO-8859-1"
%>
%@pageimport=%>
%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+"
:
//"
+request.getServerName()+"
+request.getServerPort()
+path+"
/"
html>
<
head>
basehref="
%=basePath%>
>
title>
MyJSP'
login_action.jsp'
startingpage<
/title>
/head>
body>
Stringusername=request.getParameter("
username"
Stringpassword=request.getParameter("
password"
if(username==null||password==null)
response.sendRedirect("
login.jsp"
%
//验证登录
booleanisValid=false;
UserBeanuserBean=newUserBean();
isValid=userBean.valid(username,password);
if(isValid)
session.setAttribute("
username);
welcome.jsp"
else
/body>
/html>
6.Login.jsp
utf-8"
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+"
+request.getServerName()+"
+request.getServerPort()+path+"
!
DOCTYPEHTMLPUBLIC"
-//W3C//DTD
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