JavaEE SSM框架整合 图书管理系统 实战D2 实现增删改查

环境配置见我的上一篇文章：环境配置

环境搭建好了，现在我们开始建一个类了。这个根据类就是你数据库所建的表所建立，放在src下面的包中，包名自己随意就好，但是配置时记得包名要跟自己写的一样。类中的字段要跟数据库的一样。

目录

pojo类

Book

User

Dao接口

BookDao

UserDao

Service接口：

BookService

UserService

ServiceImpl实现类

BookServiceImpl

UserServiceImpl

Controller层

BookController

UserControler

---

pojo类

Book

package com.qiqi.pojo;

public class Book {
    private Integer id;
    private String bid;
    private String name;
    private String type;
    private double price;

    public Integer getId() {
        return id;
    }

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

    public String getBid() {
        return bid;
    }

    public void setBid(String bid) {
        this.bid = bid;
    }

    public String getName() {
        return name;
    }

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

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }
}

User

package com.qiqi.pojo;

public class User {
    private String name;
    private String password;

    public String getName() {
        return name;
    }

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

    public String getPassword() {
        return password;
    }

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

下面是Dao接口，是数据持久层，也是底层，负责与数据库进行联络。这里我们不用写Dao的实现类，spring会自动帮我们生成，我们只需要在模块中调用此接口来进行数据业务的处理，而不用关心此接口的具体实现类是哪个类。Dao层的数据源配置，以及有关数据库连接的参数都在Spring的配置文件中进行配置。我这里用的是注解SQL语句，当然也可以用Mpper.xml，全看各位喜好了

Dao接口

BookDao

package com.qiqi.dao;

import com.qiqi.pojo.Book;
import org.apache.ibatis.annotations.*;

import java.util.List;

public interface BookDao {
    @Select("select * from t_book")
    List findAllBook();
    @Select("select * from t_book where bid=#{bid}")
    Book findOne(String sid);
    @Select("select * from t_book where name like concat(concat('%', #{name}),'%');")
    List findName(String name);
    @Insert("insert into t_book(bid,name,type,price) values (#{bid},#{name},#{type},#{price})")
     int insertBook(Book book);
    @Update("update t_book set bid=#{bid},name=#{name},type=#{type},price=#{price} where bid=#{bid}")
    int updateBook(Book book);
    @Delete("delete from t_book where id=#{id}")
    int  deleteBook( Integer id);
}

UserDao

import org.apache.ibatis.annotations.*;

import java.util.List;

public interface UserDao {
    @Insert("insert into t_user(name,password) values(#{name},#{password})")
    int insert(User user);
  
    @Select("select * from t_user where name=#{name} and password=#{password}")
     User findUser(@Param("name") String name ,@Param("password") String password);
}

下面是Service层也就业务逻辑层。这个层是用接口类和实现类两个去执行业务。总之它处于中间位置，它调用DAO层的接口，又要提供接口给Controller层的类来进行调用。他也要进行配置，在spring-config.xml中加入

这个我在上一篇文章中写过。

下面是Service接口：

BookService

import com.qiqi.pojo.Book;

import java.util.List;

public interface BookService {
    List findAllBook();
    Book findOneBook(String bid);
    List findName(String name);
    int addBook(Book book);
    int UpdateBook(Book book);
    int deleteBook(Integer id);

}

UserService

这边主要是实现图书馆的登录和注册功能

package com.qiqi.service;
import com.qiqi.pojo.User;

import java.util.List;

public interface UserService {
    User login(String name,String password);
    int addUser(User user);//注册
}

ServiceImpl实现类

BookServiceImpl

这里用注解@Autowirde实现Bean的自动装配。这个注解是属于 Spring 的容器配置的一个注解，它主要通过Spring 从 ApplicationContext 中先类型再名字的顺序搜寻符合指定类型的所有 bean。类似于“Book book=applicatContext.getBean("student",Student.class)”或bookService = ioc.getBean(BookService.class)等·。具体可看IOC和DI。

package com.qiqi.service.impl;

import com.qiqi.dao.BookDao;
import com.qiqi.pojo.Book;
import com.qiqi.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
@Service
public class BookServiceImpl implements BookService {
    @Autowired
    private BookDao bookDao;
    @Override
    public List findAllBook() {
        return bookDao.findAllBook();
    }

    @Override
    public Book findOneBook(String bid) {
        return bookDao.findOne(bid);
    }

    @Override
    public List findName(String name) {
        return bookDao.findName(name);
    }
    @Override
    public int addBook(Book book) {
      return  bookDao.insertBook(book);
    }

    @Override
    public int UpdateBook(Book book) {
        return   bookDao.updateBook(book);
    }

    @Override
    public int deleteBook(Integer id) {
      return   bookDao.deleteBook(id);
    }
}

UserServiceImpl

package com.qiqi.service.impl;

import com.qiqi.dao.UserDao;
import com.qiqi.pojo.User;
import com.qiqi.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    UserDao userDao;//我这里没写private，有需要可以加上去


    @Override
    public User login(String name,String password) {
       return userDao.findUser(name, password);
    }

   
    @Override
    public int addUser(User user) {
        return  userDao.insert(user);
    }

}

最后就是Controller层

controller层负责具体的业务模块流程的控制，在此层里面要调用Service层的接口来控制业务流程。

BookController

package com.qiqi.controller;

import com.qiqi.pojo.Book;
import com.qiqi.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;


@Controller
public class BookController {
    @Autowired
    private BookService bookService;
    @RequestMapping("findAll")
    public String findAllBook( Model model){
        model.addAttribute("bookList",bookService.findAllBook());
        return "Book";
    }
    @RequestMapping("addBook")
    @ResponseBody
    public String addBook(Book book ){
        int row= bookService.addBook(book);
        if(row>0)
            return "ok";
        else
            return "error";

    }
    @RequestMapping("findOneBook")
    @ResponseBody
    public Book findOneBook(String bid){
        return bookService.findOneBook(bid);
    }

    @RequestMapping("findName")
    public String findName(String name,Model model){
        if (name!=null&&!name.equals("")){
            List list=bookService.findName(name);
            model.addAttribute("bookList",list);
            return "Book";
        }
        model.addAttribute("error","未查询到相关数据，请输入已有内容");
        return "Book";
    }

    @RequestMapping("updateBook")
    @ResponseBody
    public String updateBook(Book book){
     int row= bookService.UpdateBook(book);
        if(row>0)
            return "ok";
        else
            return "error";
    }
    @RequestMapping("deleteBook")
    @ResponseBody
    public String deleteBook(Integer id){
        int row=bookService.deleteBook(id);
        if(row>0)
            return "ok";
        else
            return "error";
    }
}

UserControler

package com.qiqi.controller;
import com.qiqi.pojo.User;
import com.qiqi.service.UserService;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.annotation.Resource;
@Controller
public class UserController {
    @Resource
    private UserService service;

    @RequestMapping("userLogin")
    public String login(String name,String password,Model model){
    User user=service.login(name, password);
    if (user!=null){
        return "Book";
    }
        model.addAttribute("logMsg","用户名密码错误或不存在");
        return "register";
    }
    @RequestMapping("registerUser")
    @ResponseBody
    public String addUser(User user ){
        int row= service.addUser(user);
        if(row>0)
            return "ok";
        else
            return "error";
    }
}

最后一个是视图层，下个文章再写，主要用Bootstrap和CSS技术做美观，利用JQuery提交数据，当然如果感兴趣也可以JSON和Ajax。

下一篇：视图层