利用Spring-MVC访问数据库
1、创建相关的项目。首先相关路径，在pom.xml中添加具有Spring-mvc、mysql、dbcp的三个包。
2、首先创建Admin类与数据库信息对应。
2.1、数据库：
2.2、 jdbc-properties（名称不可改变） user是数据库名
url=jdbc:mysql://localhost:3306/user?useUnicode=true&characterEncoding=utf-8
driverClass=com.mysql.jdbc.Driver
user=root
password=123456
maxActive=1
initSize=12.3、Admin类
package com.zhiyou100.dao;
import java.io.Serializable;
public class Admin implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
private String adminId;
private String password;
private String telephone;
private String adminCode;
private String name;
public Admin(String adminId, String password, String telephone, String adminCode, String name) {
super();
this.adminId = adminId;
this.password = password;
this.telephone = telephone;
this.adminCode = adminCode;
this.name = name;
}
public Admin(String password, String telephone, String adminCode, String name) {
super();
this.password = password;
this.telephone = telephone;
this.adminCode = adminCode;
this.name = name;
}
public Admin() {
super();
}
public String getAdminId() {
return adminId;
}
public void setAdminId(String adminId) {
this.adminId = adminId;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getTelephone() {
return telephone;
}
public void setTelephone(String telephone) {
this.telephone = telephone;
}
public String getAdminCode() {
return adminCode;
}
public void setAdminCode(String adminCode) {
this.adminCode = adminCode;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
3.创建AdminDao接口，为通过findByCode方法，实现与数据库连接、查询操作。
package com.zhiyou100.dao;
public interface AdminDao {
Admin findByCode(String adminCode);
}
4、创建AdminDaoImp类实现AdminDao接口的方法
package com.zhiyou100.dao;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.annotation.Resource;
import org.apache.tomcat.dbcp.dbcp.BasicDataSource;
import org.springframework.stereotype.Repository;
import java.sql.PreparedStatement;
@Repository
public class AdminDaoImp implements AdminDao {
//注入数据源
@Resource
private BasicDataSource ds;
public Admin findByCode(String adminCode) {
if(adminCode==null) {
return null;
}
Connection conn=null;
try {
conn=ds.getConnection();
String sql="select *from user where adminCode=?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, adminCode);
ResultSet rSet=ps.executeQuery();
if(rSet.next()) {
Admin admin=new Admin();
admin.setAdminCode(rSet.getString("adminCode"));
admin.setAdminId(rSet.getString("adminId"));
admin.setName(rSet.getString("name"));
admin.setPassword(rSet.getString("password"));
admin.setTelephone(rSet.getString("telephone"));
return admin;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
}
5、创建LoginService，利用LoginService逻辑判断是否登录成功
package com.zhiyou100.service;
import com.zhiyou100.dao.Admin;
//利用LoginService逻辑判断是否登录成功
public interface LoginService {
Admin checkAdmin(String adminCode,String password);
}6、创建LoginServiceImpl的类实现LoginService，判断是否登录成功
package com.zhiyou100.service;
import javax.annotation.Resource;
import org.omg.CORBA.PRIVATE_MEMBER;
import org.omg.CORBA.PUBLIC_MEMBER;
import org.springframework.stereotype.Service;
import com.zhiyou100.Exception.AdminCodeException;
import com.zhiyou100.Exception.PasswordException;
import com.zhiyou100.dao.Admin;
import com.zhiyou100.dao.AdminDao;
@Service
public class LoginServiceImpl implements LoginService {
@Resource
private AdminDao adminDao;
public Admin checkAdmin(String adminCode, String password)
throws PasswordException, AdminCodeException {
Admin admin = adminDao.findByCode(adminCode);
if (admin == null) {
throw new AdminCodeException("账号出错");
} else if (!admin.getPassword().equals(password)) {
throw new PasswordException("密码出错");
} else {
return admin;
}
}
}
7.在运行过程中会有异常的出现，所以处理异常
AdminCodeException异常
package com.zhiyou100.Exception;
/**
* @author Administrator
*
*/
public class AdminCodeException extends RuntimeException{
public AdminCodeException(String message) {
super(message);
}
}
PasswordException异常
/**
*
*/
package com.zhiyou100.Exception;
/**
* @author Administrator
*
*/
public class PasswordException extends RuntimeException{
public PasswordException(String message) {
super(message);
}
}
8.创建LoginContrller类，约定方法可以返回一个ModelAndView对象，封装了处理结果数据和视图名称信息。
package com.zhiyou100.etity;
import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import org.apache.tomcat.dbcp.dbcp.BasicDataSource;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import com.zhiyou100.Exception.AdminCodeException;
import com.zhiyou100.Exception.PasswordException;
import com.zhiyou100.dao.Admin;
import com.zhiyou100.service.LoginService;
@Controller
@RequestMapping("/login")
public class LoginContrller {
@Resource
private LoginService loginService;
@RequestMapping("/toLogin.do")
public String toLogin() {
return "main/login";
}
@RequestMapping("/toIndex.do")
public String toIndex() {
return "main/index";
}
@RequestMapping("/checkLogin.do")
public String checkLogin(HttpSession session,
String adminCode,
String password,
ModelMap model) {
try {
Admin admin=loginService.checkAdmin(adminCode, password);
//登录成功后，把用户信息放进Session中
session.setAttribute("admin",admin);
} catch (AdminCodeException e) {
// TODO: handle exception
model.addAttribute("message",e.getMessage());
model.addAttribute("adminCode", adminCode);
model.addAttribute("password", password);
return "main/login";
}
catch (PasswordException e) {
// TODO: handle exception
model.addAttribute("message",e.getMessage());
model.addAttribute("adminCode", adminCode);
model.addAttribute("password", password);
return "main/login";
}
//登录成功后重定向到主界面
return "redirect:toIndex.do";
// BasicDataSource
}
}
9.在WEB-INF 下建立对应的jsp.
在运行后，输入相应的网址eg:login/toLogin.do ，login/toIndex.do,login/checkLogin会跳转到相对的jsp.
刚开始写博客，有错误的地方，欢迎指出！
不喜勿喷！！！