javaweb实现登录案例
功能：给出登录页面，登陆成功。给出成绩页面并且支持修改成绩分数。
效果展示：
总结：麻雀虽小，五脏俱全。登陆成功的页面支持修改成绩，实时反馈，登录页面涉及了jqueryUI设计警告弹窗+ajax向服务器传送数据。剩下的就是和数据库的操作。
login.jsp(页面)
利用jqueryUI设计弹出警告框。通过ajax向服务器发送请求，并返回结果。
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Document
Login
success.jsp(成绩页面)
<%@page import="com.item.domain.Studentscore"%>
<%@page import="java.util.ArrayList"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Insert title here
<%
ArrayListarraylist=(ArrayList)request.getAttribute("arraylist");
%>
姓名
课程
成绩
<% for(Studentscore stu:arraylist){%>
<%=stu.getName() %>
<%=stu.getCourse()%>
<%=stu.getScore() %>
<% }%>
com.item.servlet.demo(Servlet)
LoginServlet1.java
package com.item.servlet.demo;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.item.domain.Student;
import com.item.domain.Studentscore;
import com.item.model.UesrModel;
import com.item.utiles.SearchStudent;
/**
* Servlet implementation class LoginServlet
*
*/
@WebServlet(urlPatterns = "/LoginServlet1",
initParams = {
@WebInitParam(name="times",value="30")
}
)
public class LoginServlet1 extends HttpServlet {
private static final long serialVersionUID = 1L;
int sum=10;
/**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
// TODO Auto-generated method stub
super.init(config);
System.out.println("Servlet被初始化");
ServletConfig servletConfig = this.getServletConfig();
String initParameter = servletConfig.getInitParameter("times");
sum=Integer.parseInt(initParameter);
}
/**
*
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html;charset=UTF-8");
if(sum<=0) {
response.getWriter().print("登录次数已达上限，禁止使用！");
return ;
}
//response.getWriter().print("访问"+sum+"次");
sum--;
String loginStatus=request.getParameter("loginStatus");
if(loginStatus.equals("loginsuccess")) {
try {
LoginSuccess(request,response);
} catch (ServletException | IOException | SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ;
}
String sno=request.getParameter("sno");
String psw=request.getParameter("psw");
//System.out.println(sno+" ,"+psw);
Student student=new Student();
student.setSno(sno);
student.setPwd(psw);
UesrModel usermodel=new UesrModel();
try {
Student login = usermodel.login(student);
if(login==null) {
response.getWriter().print("error");
// response.sendRedirect("login.jsp");
return ;
}else {
response.getWriter().print("loginsuccess");
return ;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void LoginSuccess(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException, SQLException {
// TODO Auto-generated method stub
SearchStudent searchStudent=new SearchStudent();
ArrayList<Studentscore>arrayList=searchStudent.Searchcourse();
request.setAttribute("arraylist", arrayList);
request.getRequestDispatcher("success.jsp").forward(request, response);
}
/**
* @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);
}
}
UpdateServlet.java
package com.item.servlet.demo;
import java.io.IOException;
import java.sql.SQLException;
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.item.domain.Studentscore;
import com.item.utiles.SearchStudent;
import com.item.utiles.UpdateStudent;
/**
* Servlet implementation class UpdateServlet
*/
@WebServlet("/UpdateServlet")
public class UpdateServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String name=request.getParameter("name");
String course=request.getParameter("course");
String score=request.getParameter("score");
int scores;
scores=Integer.parseInt(score);
Studentscore stu=new Studentscore();
stu.setName(name);
stu.setCourse(course);
stu.setScore(scores);
UpdateStudent upStudent=new UpdateStudent();
try {
upStudent.Update(stu);
SearchStudent searchStudent=new SearchStudent();
ArrayList<Studentscore>arrayList=searchStudent.Searchcourse();
request.setAttribute("arraylist", arrayList);
request.getRequestDispatcher("success.jsp").forward(request, response);
} catch (SQLException e) {
// TODO Auto-generated catch block
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);
}
}
com.item.utiles(一些工具包)
DButiles.java
package com.item.utiles;
import javax.sql.DataSource;
import com.mchange.v2.c3p0.ComboPooledDataSource;
public class DButiles {
private static ComboPooledDataSource dataSource=new ComboPooledDataSource();
public static DataSource getDADataSource() {
return dataSource;
}
}
SearchStudent.java
package com.item.utiles;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import com.item.domain.Studentscore;
public class SearchStudent {
public ArrayList<Studentscore> Searchcourse() throws SQLException {
QueryRunner queryRunner=new QueryRunner(DButiles.getDADataSource());
String sql="select * from score";
ArrayList<Studentscore>arraylist=(ArrayList<Studentscore>) queryRunner.query(sql,new BeanListHandler<Studentscore>(Studentscore.class));
// for(Studentscore stu:arraylist) {
// System.out.println(stu.getName()+" "+stu.getCourse()+" "+stu.getScore());
// }
return arraylist;
}
public static void main(String[] args) throws SQLException {
QueryRunner queryRunner=new QueryRunner(DButiles.getDADataSource());
String sql="select * from score";
ArrayList<Studentscore>arraylist=(ArrayList<Studentscore>) queryRunner.query(sql,new BeanListHandler<Studentscore>(Studentscore.class));
for(Studentscore stu:arraylist) {
System.out.println(stu.getName()+" "+stu.getCourse()+" "+stu.getScore());
}
}
}
UpdateStudent.java
package com.item.utiles;
import java.sql.SQLException;
import java.util.ArrayList;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import com.item.domain.Studentscore;
public class UpdateStudent {
public void Update(Studentscore stu) throws SQLException {
QueryRunner queryRunner=new QueryRunner(DButiles.getDADataSource());
String sql="update score set score=? where course=?";
int cnt=queryRunner.update(sql,stu.getScore(),stu.getCourse());
if(cnt>0) {
System.out.println("修改成功");
}else {
System.out.println("修改失败");
}
}
// public static void main(String[] args) throws SQLException {
// QueryRunner queryRunner=new QueryRunner(DButiles.getDADataSource());
// String sql="update score set name=?,score=? where course=? ";
// int cnt=queryRunner.update(sql,new Object[]{"溜溜","200","python"});
// if(cnt>0) {
// System.out.println("修改成功");
// }else {
// System.out.println("修改失败");
// }
// }
}
c3p0-config.xml(c3p0配置)
<c3p0-config>
<default-config>
<property name="driverClass">com.mysql.jdbc.Driverproperty>
<property name="jdbcUrl">jdbc:mysql://localhost:3308/web_login?characterEncoding=utf8property>
<property name="user">rootproperty>
<property name="password">3308property>
<property name="initialPoolSize">5property>
<property name="minPoolSize">5property>
<property name="maxPoolSize">20property>
default-config>
c3p0-config>
com.item.domain(封装的实体类，登录，成绩)
Student.java
package com.item.domain;
public class Student {
private String sno;
private String pwd;
public String getSno() {
return sno;
}
public void setSno(String sno) {
this.sno = sno;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
}
Studentscore.java
package com.item.domain;
public class Studentscore {
private String name;
private String course;
private int score;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCourse() {
return course;
}
public void setCourse(String course) {
this.course = course;
}
public int getScore() {
return score;
}
public void setScore(int score) {
this.score = score;
}
}