我在這裡用的不是maven專案,用的一般的web專案,所以需要用到的架包需要自己去下載添加,在專案中,一定注意環境的配置,我用的是jre1.7
1新專案
2 建立好MVC的管理包,導入對應的架包servlet
3 建立好與資料庫對應的實體類登陸框
1
2
public class Teacher {
private int tid;
private String tname;
private String tpsw;
public int getTid() {
return tid;
}
public void setTid(int tid) {
this.tid = tid;
}
public String getTname() {
return tname;
}
public void setTname(String tname) {
this.tname = tname;
}
public String getTpsw() {
return tpsw;
}
public void setTpsw(String tpsw) {
this.tpsw = tpsw;
}
public Teacher(String tname, String tpsw) {
super();
this.tname = tname;
this.tpsw = tpsw;
}
public Teacher(int tid, String tname, String tpsw) {
super();
this.tid = tid;
this.tname = tname;
this.tpsw = tpsw;
}
public Teacher() {
super();
}
}6 編寫對應的請求實體類LoginController.java:繼承HttpServlet重寫doget(),dopost()方法,根據method請求的不同呼叫doget或dopost方法
login com.zr.controller.LoginController login /login
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.zr.model.Teacher;
import com.zr.service.valiDateService;
import com.zr.serviceIm.valiDateServiceImpl;
public class LoginController extends HttpServlet{
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
super.doPost(req, resp);
}
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//获取前台form表单的input输入框
String tname=req.getParameter("tname");
String tpsw=req.getParameter("tpsw");
Teacher tc=new Teacher();
tc.setTname(tname);
tc.setTpsw(tpsw);
valiDateService vds=new valiDateServiceImpl();
Teacher t= vds.valiDateTeacher(tc);
HttpSession session=req.getSession();
session.setAttribute("teacher", t);
if (t!=null) {
//返回的不是空值,重定向到登录成功界面
req.getRequestDispatcher("main.jsp").forward(req, resp);
} else {
//返回空值,请求转发到登录界面
resp.sendRedirect("login.jsp");
}
}
}public interface TeacherDao {
/**
* 验证老师是否存在
* @param tc
* @return
*/
public Teacher validateTeacher(Teacher tc);
}package JDBCUtil;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBCUtil {
//1.数据库地址 (根据不同的数据标准是不一样)
private final static String DBURL = "jdbc:mysql://localhost:3306/student_crm?useUnicode=true&characterEncoding=UTF8";
//2.设置用户和密码
private final static String USERNAME = "root";
private final static String PASSWORD = "root";
//3.设置驱动名称 (根据不同的数据标准是不一样)
private final static String DBDRIVER = "com.mysql.jdbc.Driver";
/**
* 获取数据库连接
* @return 返回数据库连接
*/
public static Connection getConnection(){
Connection con = null;
try {
Class.forName(DBDRIVER);
con = DriverManager.getConnection(DBURL, USERNAME, PASSWORD);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return con;
}
//关闭连接
public static void closeJDBC(Statement st,Connection con) throws SQLException{
if(st!=null){
st.close();
}
if(con!=null){
con.close();
}
}
}import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.zr.dao.TeacherDao;
import com.zr.model.Teacher;
import JDBCUtil.JDBCUtil;
public class TeacherDaoImpl implements TeacherDao{
/**
* 输入老师的对象,返回老师对象
* @param args
*/
public Teacher validateTeacher(Teacher tc) {
Teacher teacher=new Teacher();
//sql语句
StringBuffer sql=new StringBuffer("select * from teacher where tname=? and tpsw=?");
//获取数据库连接
Connection con=JDBCUtil.getConnection();
try {
PreparedStatement pst=con.prepareStatement(sql.toString());
pst.setString(1, tc.getTname());
pst.setString(2, tc.getTpsw());
//返回一个结果集
ResultSet rs=pst.executeQuery();
if (rs.next()) {
//把结果集里面的数据放入对应的teacher对象
teacher=new Teacher(rs.getInt("tid"),rs.getString("tname"),rs.getString("tpsw"));
}
} catch (SQLException e) {
e.printStackTrace();
}
return teacher;
}
}public interface valiDateService {
/**
* @param tc
* @return 老师对象
* 根据用户输入值验证老师是否存在
*/
public Teacher valiDateTeacher(Teacher tc);
}
