smm整合

配置整合

这个里面SpringConfig 就是书写Spring的配置类，其中加载了jdbc配置类和mybatis配置类，还加载了jdbc资源类。

package com.itheima.config;

import org.springframework.context.annotation.*;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@ComponentScan({"com.itheima.service"})
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class,MybatisConfig.class})
@EnableTransactionManagement
public class SpringConfig {
}

ServletConfig主要是整合了Spring的配置，以及SpringMvc表现层的东西。

package com.itheima.config;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class ServletConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{SpringConfig.class};
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{SpringMvcConfig.class};
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

JdbcConfig就是把数据库连接进行加载：

package com.itheima.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;

import javax.sql.DataSource;

public class JdbcConfig {
    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String username;
    @Value("${jdbc.password}")
    private String password;
    @Bean
    public DruidDataSource dataSource(){
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driver);

        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        return dataSource;
    }
    @Bean
    public PlatformTransactionManager transactionManager(DataSource dataSource){
        DataSourceTransactionManager ds = new DataSourceTransactionManager();
        ds.setDataSource(dataSource);
        return ds;
    }
}

功能：

dao层：书写sql语句

package com.itheima.dao;

import com.itheima.domin.Book;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import java.util.List;

public interface BookDao {
    @Insert("insert into tbl_book values(#{id},#{type},#{name},#{description})")
    public boolean save(Book book);
    @Update("update tbl_book set type=#{type},name=#{name},description=#{description} where id=#{id}")
    public boolean update(Book book);
    @Delete("delete from tbl_book where id=#{id}")
    public boolean delete(int id);
    @Select("select * from tbl_book where id=#{id}")
    public Book getById(int id);
    @Select("select * from tbl_book")

    public List<Book> getAll();

}

service层：服务

package com.itheima.service.impl;

import com.itheima.dao.BookDao;
import com.itheima.domin.Book;
import com.itheima.service.BookService;
import org.apache.ibatis.annotations.Delete;
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;

    public BookServiceImpl(BookDao bookDao) {
        this.bookDao = bookDao;
    }

    @Override
    public boolean save(Book book) {

        return bookDao.save(book);
    }

    @Override
    public boolean update(Book book) {

        return bookDao.update(book);
    }

    @Override
    public boolean delete(int id) {

        return bookDao.delete(id);
    }

    @Override
    public Book getById(int id) {
        return bookDao.getById(id);
    }

    @Override
    public List<Book> getAll() {
        return bookDao.getAll();
    }
}

package com.itheima.service;

import com.itheima.domin.Book;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
@Transactional
public interface BookService {

    public boolean save(Book book);

    public boolean update(Book book);

    public boolean delete(int id);

    public Book getById(int id);

    public List<Book> getAll();

}

controller层：实现逻辑

package com.itheima.controller;

import com.itheima.dao.BookDao;
import com.itheima.domin.Book;
import com.itheima.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/books")
public class BookController {
    @Autowired
    private BookService bookService;
    @PostMapping
    public Result save(@RequestBody Book book) {
        boolean flag = bookService.save(book);
        return new Result(flag,flag?Code.SAVE_OK:Code.SAVE_ERR);

    }
    @PutMapping
    public Result update(@RequestBody Book book) {
        boolean flag = bookService.update(book);
        return new Result(flag,flag?Code.UPDATE_OK:Code.UPDATE_ERR);

    }

    @DeleteMapping("/{id}")
    public Result delete(@PathVariable int id) {
        boolean flag = bookService.delete(id);
        return new Result(flag,flag?Code.DELETE_OK:Code.DELETE_ERR);
    }

    @GetMapping("/{id}")
    public Result getById(@PathVariable int id) {
        Book book = bookService.getById(id);
        Integer code = book!=null?Code.GET_OK:Code.GET_ERR;
        return new Result(book,code);
    }
    @GetMapping
    public Result getAll() {
        List<Book> bookList = bookService.getAll();
        Integer code = bookList!=null?Code.GET_OK:Code.GET_ERR;
        String msg = bookList!=null?"查询成功":"查询失败，请重试";
        return new Result(msg,bookList,code);
    }
}

结果集的封装：

package com.itheima.controller;

public class Code {
    public static final Integer SAVE_OK=20011;
    public static final Integer DELETE_OK=20021;
    public static final Integer UPDATE_OK=20031;
    public static final Integer GET_OK=20041;
    public static final Integer SAVE_ERR=20010;
    public static final Integer DELETE_ERR=20020;
    public static final Integer UPDATE_ERR=20030;
    public static final Integer GET_ERR=20040;

}

package com.itheima.controller;

public class Result {
    private String msg;
    private Object data;
    private Integer code;

    public Result(Object data, Integer code) {
        this.data = data;
        this.code = code;
    }

    public Result(String msg, Object data) {
        this.msg = msg;
        this.data = data;
    }

    public Result(Integer code) {
        this.code = code;
    }

    public Result(Object data) {
        this.data = data;
    }

    public Result(String msg) {
        this.msg = msg;
    }

    public Result(String msg, Object data, Integer code) {
        this.msg = msg;
        this.data = data;
        this.code = code;
    }

    public Result() {
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }
}

以上就是具体的一些操作。

pom.xml文件

srping-webmvc：spring整合前端

spring-jdbc：spring整合数据库

spring-test：spring整合测试类

mybatis：mybatis框架

mysql-connector-java：mysql数据库

druid：阿里巴巴开发的druid数据源，用来连接数据库

servlet：这里要加<scope>标签，因为这个会跟tomcat产生冲突

jackson-databind：传输json数据

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>spring_01</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.source>1.8</maven.compiler.source>
        <junit.version>5.8.2</junit.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.10.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.10.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.2.10.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.31</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.29</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.12.7.1</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <!-- tomcat7插件 maven 命令 tomcat7:run 启动项目-->
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.1</version>
                <configuration>
                    <port>8080</port>
                    <path>/</path>

                </configuration>
            </plugin>

        </plugins>
    </build>
</project>