ssm框架整合实现简单的增删改查功能！！！

参考这个环境配置：ssm框架的简单整合！！！（配置环境）-CSDN博客

思路：建立好环境后，我们要根据Spring MVC三层架构的思想建立项目结构。

 一、controller控制层：（一共有两个类：AccountController和LoginController）

AccountController:

/*
 * Copyright (c) 2020, 2024,  All rights reserved.
 *
 */
package com.by.controller;

import com.by.pojo.Account;
import com.by.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.List;

/**
 * 
Project: SpringMVC - AccountController
 * 
Powered by scl On 2024-01-10 16:28:10
 * 
描述：

 *
 * @author 孙臣龙 [[email protected]]
 * @version 1.0
 * @since 17
 */
@Controller
@RequestMapping("/account")
public class AccountController {

    @Autowired
    private AccountService accountService;

    @RequestMapping("/loginAccount")
    public String login(HttpServletRequest request) {
        Integer id = (Integer) request.getAttribute("id");
        String userName = request.getAttribute("userName").toString();
        String password= request.getAttribute("password").toString();
        return "selectAccount";
    }

    /**
     * 查询
     *
     * @param model
     * @return
     */
    @RequestMapping("/selectAccount")
    public String selectAccount(Model model) {
        List accountList = accountService.selectAccount();
        model.addAttribute("accountList", accountList);
        return "select_Account";
    }

    /**
     * 添加前的跳转页面
     *
     * @return
     */
    @RequestMapping("/toAccount")
    public String toAccount() {
        return "add_Account";
    }

    /**
     * 添加页面
     *
     * @param account
     * @param img
     * @param request
     * @return
     * @throws IOException
     */
    @RequestMapping("/addAccount")
    public String addAccount(Account account, MultipartFile img, HttpServletRequest request) throws IOException {
        if (!img.isEmpty()){
            //获取上传目录
            String realPath = request.getSession().getServletContext().getRealPath("uploads");
            //判断文件是否存在
            File file = new File(realPath);
            if (!file.exists()) {
                file.mkdirs();
            }
            //上传
            String filename = img.getOriginalFilename();
            img.transferTo(new File(realPath, filename));
            account.setHead(filename);
        }
        accountService.addAccount(account);
        return "redirect:selectAccount";
    }

    /**
     * 根据id删除
     *
     * @param id
     * @return
     */
    @GetMapping("/deleteAccount/{id}")
    public String deleteAccount(@PathVariable Integer id) {
        accountService.deleteAccount(id);
        return "redirect:/account/selectAccount";
    }

    /**
     * 数据回显
     *
     * @param id
     * @param model
     * @return
     */
    @RequestMapping("/upAccount/{id}")
    public String upAccount(@PathVariable Integer id, Model model) {
        Account account = accountService.selectAccountById(id);
        model.addAttribute("account", account);
        return "update_Account";
    }

    /**
     * 修改
     */
    @RequestMapping("/updateAccount/{id}")
    public String updateAccount(@PathVariable Integer id, Account account, MultipartFile img, HttpServletRequest request) throws IOException {
        if (!img.isEmpty()){
            //获取上传路径
            String realPath = request.getSession().getServletContext().getRealPath("uploads");
            //判断目录是否存在
            File file = new File(realPath);
            if (!file.exists()) {
                file.mkdirs();
            }
            //上传
            String filename = img.getOriginalFilename();
            img.transferTo(new File(realPath, filename));
            account.setHead(filename);
        }
        account.setId(id);
        accountService.updateAccount(account);
        return "redirect:/account/selectAccount";
    }


}

LoginController:

/*
 * Copyright (c) 2020, 2024,  All rights reserved.
 *
 */
package com.by.controller;

import com.by.pojo.User;
import com.by.service.LoginService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 
Project: SpringMVC - LoginController
 * 
Powered by scl On 2024-01-11 10:00:36
 * 
描述：

 *
 * @author 孙臣龙 [[email protected]]
 * @version 1.0
 * @since 17
 */
@Controller
@RequestMapping("/account")
public class LoginController {

    @Autowired
    private LoginService loginService;


    @PostMapping("/loginAccount")
    public String loginAccount(User user) {
        User userDome = loginService.login(user);

        if (userDome!=null)return "redirect:selectAccount";
        else return "redirect:/index.jsp";
    }
}

二、相应的service也有两个，两个接口和两个实现类

AccountService：

package com.by.service;

import com.by.pojo.Account;
import com.by.pojo.User;

import java.util.List;

/**
 * 
Project: SpringMVC - AccountService
 * 
Powered by scl On 2024-01-10 16:32:52
 * 
描述：

 *
 * @author 孙臣龙 [[email protected]]
 * @version 1.0
 * @since 17
 */
public interface AccountService {
    List selectAccount();

    void addAccount(Account account);

    void deleteAccount(Integer id);

    Account selectAccountById(Integer id);

    void updateAccount(Account account);

}

AccountServiceImpl：

/*
 * Copyright (c) 2020, 2024,  All rights reserved.
 *
 */
package com.by.service;

import com.by.mapper.AccountMapper;
import com.by.pojo.Account;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * 
Project: SpringMVC - AccountServiceImpl
 * 
Powered by scl On 2024-01-10 16:33:40
 * 
描述：

 *
 * @author 孙臣龙 [[email protected]]
 * @version 1.0
 * @since 17
 */
@Service
@Transactional
public class AccountServiceImpl implements AccountService{

    @Autowired
    private AccountMapper accountMapper;


    @Override
    public List selectAccount() {
        List accountList= accountMapper.selectAccount();
        return accountList;
    }

    @Override
    public void addAccount(Account account) {
        accountMapper.addAccount(account);
    }

    @Override
    public void deleteAccount(Integer id) {
        accountMapper.deleteAccount(id);
    }

    @Override
    public Account selectAccountById(Integer id) {
        return accountMapper.selectAccountById(id);
    }

    @Override
    public void updateAccount(Account account) {
        accountMapper.updateAccount(account);
    }
}

LoginService：

package com.by.service;

import com.by.pojo.User;

/**
 * 
Project: SpringMVC - LoginService
 * 
Powered by scl On 2024-01-11 10:26:40
 * 
描述：

 *
 * @author 孙臣龙 [[email protected]]
 * @version 1.0
 * @since 17
 */
public interface LoginService {
    User login(User user);

}

LoginServiceImpl：

/*
 * Copyright (c) 2020, 2024,  All rights reserved.
 *
 */
package com.by.service;

import com.by.mapper.LoginMapper;
import com.by.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * 
Project: SpringMVC - LoginServiceImpl
 * 
Powered by scl On 2024-01-11 10:27:13
 * 
描述：

 *
 * @author 孙臣龙 [[email protected]]
 * @version 1.0
 * @since 17
 */
@Service
@Transactional
public class LoginServiceImpl implements LoginService {

    @Autowired
    private LoginMapper loginMapper;

    @Override
    public User login(User user) {

        return loginMapper.login(user);

    }
}

三、mapper层也就是我们说的dao层

AccountMapper:

package com.by.mapper;

import com.by.pojo.Account;

import java.util.List;

/**
 * 
Project: SpringMVC - AccountMapper
 * 
Powered by scl On 2024-01-10 16:34:53
 * 
描述：

 *
 * @author 孙臣龙 [[email protected]]
 * @version 1.0
 * @since 17
 */
public interface AccountMapper {
    List selectAccount();

    void addAccount(Account account);

    void deleteAccount(Integer id);

    Account selectAccountById(Integer id);

    void updateAccount(Account account);
}

AccountMapper.xml:

    
        insert into account
        
            
                name,
            
            
                money,
            
            
                date,
            
            
                head,
            
        
        
            
                #{name},
            
            
                #{money},
            
            
                #{date},
            
            
                #{head},
            
        
    
    
        update account
        
            
                name=#{name},
            
            
                money=#{money},
            
            
                date=#{date},
            
            
                head=#{head},
            
        
            where id =#{id}
    
    
        delete
        from account
        where id = #{id}
    

    
        select *
        from account
    
    
        select *
        from account
        where id = #{id};
    

LoginMapper:

package com.by.mapper;

import com.by.pojo.User;

/**
 * 
Project: SpringMVC - LoginMapper
 * 
Powered by scl On 2024-01-11 10:28:21
 * 
描述：

 *
 * @author 孙臣龙 [[email protected]]
 * @version 1.0
 * @since 17
 */
public interface LoginMapper {

    User login(User user);
}

LoginMapper.xml:

    
        select * from user where username=#{username} and password=#{password}
    

四、实体类：（Account和User）

Account：

/*
 * Copyright (c) 2020, 2024,  All rights reserved.
 *
 */
package com.by.pojo;

import java.util.Date;

/**
 * 
Project: SpringMVC - Account
 * 
Powered by scl On 2024-01-10 16:31:18
 * 
描述：

 *
 * @author 孙臣龙 [[email protected]]
 * @version 1.0
 * @since 17
 */
public class Account {
    private Integer id;
    private String name;
    private Double money;
    private Date date;
    private String head;

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                ", date=" + date +
                ", head='" + head + '\'' +
                '}';
    }

    public String getHead() {
        return head;
    }

    public void setHead(String head) {
        this.head = head;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getMoney() {
        return money;
    }

    public void setMoney(Double money) {
        this.money = money;
    }
}

User：

/*
 * Copyright (c) 2020, 2024,  All rights reserved.
 *
 */
package com.by.pojo;

/**
 * 
Project: SpringMVC - User
 * 
Powered by scl On 2024-01-11 10:23:01
 * 
描述：

 *
 * @author 孙臣龙 [[email protected]]
 * @version 1.0
 * @since 17
 */
public class User {
    private Integer id ;
    private String username;
    private String password;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

这里还用到了自定义的日期转换格式：（converter包下的DateConverter）

/*
 * Copyright (c) 2020, 2024,  All rights reserved.
 *
 */
package com.by.converter;

import org.springframework.core.convert.converter.Converter;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * 
Project: SpringMVC - DateConverter
 * 
Powered by scl On 2024-01-10 19:39:59
 * 
描述：

 *
 * @author 孙臣龙 [[email protected]]
 * @version 1.0
 * @since 17
 */
public class DateConverter implements Converter {
    @Override
    public Date convert(String source) {
        try {
            DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
            return format.parse(source);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

全局异常处理页面：GlobalException:

/*
 * Copyright (c) 2020, 2024,  All rights reserved.
 *
 */
package com.by.exception;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 
Project: SpringMVC - GlobalException
 * 
Powered by scl On 2024-01-10 21:15:16
 * 
描述：

 *
 * @author 孙臣龙 [[email protected]]
 * @version 1.0
 * @since 17
 */
@Component
public class GlobalException implements HandlerExceptionResolver {

    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
        /**
         * 1.发邮件、发信息
         * 2.跳转到错误页面
         */
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("msg",e.getMessage());
        modelAndView.setViewName("exception");

        return modelAndView;
    }
}

接下来是jsp页面：

add_Account.jsp:

<%--
  Created by IntelliJ IDEA.
  User: admin
  Date: 2024/1/10
  Time: 19:09
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    



    账号：

    存款：

    日期：

    头像：

    

exception.jsp:

<%--
  Created by IntelliJ IDEA.
  User: admin
  Date: 2024/1/10
  Time: 21:16
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    


上传文件不能为空:${msg}

select_Account.jsp:

<%--
  Created by IntelliJ IDEA.
  User: admin
  Date: 2024/1/10
  Time: 16:37
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>


    


查询所有账户
添加

        

    

        
id
        
name
        
money
        
date
        
head
        
delete

    
    

            
${account.id}
            
${account.name}
            
${account.money}
            

            

            
删除
                /
                修改
        
    

update_Acount.jsp:

<%--
  Created by IntelliJ IDEA.
  User: admin
  Date: 2024/1/10
  Time: 21:22
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>


    



    账号：

    存款：

    
    日期：

    头像：

    

    

index.jsp:

<%--
  Created by IntelliJ IDEA.
  User: admin
  Date: 2023/8/14
  Time: 9:52
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    
    
    
    
    
    






    

        
用户登录
        

            

             用户名
        
        


            
            密码