SSM整合

标签：return 整合 SSM student org import com public

ssm框架【springmvc spring mybatis】。其实就是spring和mybatis的整合。spring的整合mybatis的配置文件到自己的配置文件中。
1 创建表


create database test03;
use test03;

create table tbl_student(
    id int primary key auto_increment comment '主键',
    name varchar(20) not null comment '姓名',
    age int default 18 comment '年龄',
    gender char(1) default '男' comment '性别',
    birthday date comment '生日',
    headImg varchar(100) comment '头像',
    class_id int comment '班级' -- 逻辑外键。
);
create table tbl_class(
    id int primary key auto_increment comment '主键',
    name varchar(20) not null comment '名称'
);
insert into tbl_class values(null,'1班');
insert into tbl_class values(null,'2班');
insert into tbl_class values(null,'3班');
insert into tbl_student values(null,'张三',18,'男','1998-01-01','https://qy178.oss-cn-hangzhou.aliyuncs.com/177f1aab969248dfaa3b2583e8b359a21.jpg',1);
insert into tbl_student values(null,'李四',19,'男','1997-01-01','https://qy178.oss-cn-hangzhou.aliyuncs.com/177f1aab969248dfaa3b2583e8b359a21.jpg',2);
insert into tbl_student values(null,'王五',20,'男','1996-01-01','https://qy178.oss-cn-hangzhou.aliyuncs.com/177f1aab969248dfaa3b2583e8b359a21.jpg',3);
insert into tbl_student values(null,'赵六',20,'男','1996-01-01','https://qy178.oss-cn-hangzhou.aliyuncs.com/177f1aab969248dfaa3b2583e8b359a21.jpg',2);

2 创建工程并添加依赖

<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 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.ykq</groupId>
  <artifactId>qy178-ssm</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <properties>
    <maven.compiler.source>8</maven.compiler.source>
    <maven.compiler.target>8</maven.compiler.target>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <spring.version>5.2.15.RELEASE</spring.version>
    <mybatis.version>3.5.16</mybatis.version>
  </properties>
  <dependencies>
    <!--springmvc-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!--mybatis-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
   <!--spring和mybatis整合的依赖-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.1.2</version>
    </dependency>
    <!--jdbc依赖-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!---->
    <!--mysql-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.33</version>
    </dependency>
    <!--servlet-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
    </dependency>
    <!--lombok-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.34</version>
    </dependency>
    <!--jackson-->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.17.2</version>
    </dependency>
    <!--druid数据源-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.2.23</version>
    </dependency>
    <!--junit-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.13.2</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <finalName>ssm</finalName>
  </build>
</project>

3 生成实体类和dao和映射文件
4 spring的配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--包扫描-->
    <context:component-scan base-package="com.ykq"/>
    <!--注解驱动-->
    <mvc:annotation-driven/>
    <!--放行静态资源-->
    <mvc:default-servlet-handler/>
    <!--视图解析器-->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--引入属性文件-->
    <context:property-placeholder location="classpath:db.properties"/>
    <!--数据源-->
    <bean id="ds" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${driver}"/>
        <property name="url" value="${url}"/>
        <property name="username" value="${user}"/>
        <property name="password" value="${password}"/>
    </bean>

    <!--SqlSessionFactoryBean 把数据源和映射文件以及mybatis其他配置文件都整合在该类中 reference-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="ds"/>
        <!--加载映射文件-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>

    <!--为dao接口生成代理实现类。-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--dao接口包名.把这些代理实现类放入容器内容。-->
        <property name="basePackage" value="com.ykq.mapper"/>
    </bean>

</beans>

5 注册spring前端控制器并且读取配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <!--过滤器-->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceRequestEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>


    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

6 controller

package com.ykq.controller;

import com.ykq.entity.Student;
import com.ykq.mapper.StudentMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

@RestController //返回的都是json数据
@RequestMapping("/student")
public class StudentController {
    @Autowired  //根据spring为接口生成的代理实现类  帮你注入该属性的值。
    private StudentMapper studentMapper;
    //查询所有学生
    @GetMapping("/getById")
    public Student getById(Integer id){
        Student student = studentMapper.selectByPrimaryKey(id);
        return student;
    }
    //添加操作
    @PostMapping("/add")
    public String add(Student student){ //接受的表单参数。
        studentMapper.insertSelective(student);
        return "添加成功";
    }
    //修改
    @PutMapping("/update")
    public String update(Student student){
        studentMapper.updateByPrimaryKeySelective(student);
        return "修改成功";
    }
    //删除操作
    @DeleteMapping("/delete")
    public String delete(Integer id){
        studentMapper.deleteByPrimaryKey(id);
        return "删除成功";
    }

    @GetMapping("/list")
    public List<Student> list(){
        List<Student> students = studentMapper.selectAll();
        return students;
    }


    //可以使用postman或apipost【软件】测试。 测试controller方法接口的。
}

如果前后端分离。后端返回的都是json数据。要求后端返回的json格式必须统一。

{

code: "状态码",

msg: "消息提示"，

data: 数据

}

package com.ykq.vo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @Author: 闫克起  view object 视图对象
 * @Description:统一格式的json数据
 * @Date: Create in 11:21 2024/10/12
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class R {
    private Integer code;//状态码
    private String msg;//提示消息

    private Object data;//数据

    public R(Integer code, String msg) {
        this.code = code;
        this.msg = msg;
    }
    
    public static R ok(){
        return new R(200,"操作成功");
    }
    public static R ok(Object data){
        return new R(200,"操作成功",data);
    }
    public static R error(String msg){
        return new R(500,"操作失败");
    }
}

controller

package com.ykq.controller;

import com.ykq.entity.Student;
import com.ykq.mapper.StudentMapper;
import com.ykq.vo.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

@RestController //返回的都是json数据
@RequestMapping("/student")
public class StudentController {
    @Autowired  //根据spring为接口生成的代理实现类  帮你注入该属性的值。
    private StudentMapper studentMapper;
    //查询所有学生
    @GetMapping("/getById")
    public R getById(Integer id){
        Student student = studentMapper.selectByPrimaryKey(id);
        if(student!=null){
            return R.ok(student);
        }
        return R.error("查询失败");
    }
    //添加操作
    @PostMapping("/add")
    public R add(Student student){ //接受的表单参数。
        int i = studentMapper.insertSelective(student);
        if(i>0){
            return new R(200,"添加成功");
        }
        return new R(500,"添加失败");
    }
    //修改
    @PutMapping("/update")
    public R update(Student student){
        int i = studentMapper.updateByPrimaryKeySelective(student);
        if(i>0){
            return new R(200,"修改成功");
        }
        return new R(500,"修改失败");
    }
    //删除操作
    @DeleteMapping("/delete")
    public R delete(Integer id){
        int i = studentMapper.deleteByPrimaryKey(id);
        if(i>0){
            return new R(200,"删除成功");
        }
        return new R(500,"删除失败");
    }

    @GetMapping("/list")
    public R list(){
        List<Student> students = studentMapper.selectAll();
        return new R(200,"查询成功",students);
    }


    //可以使用postman或apipost【软件】测试。 测试controller方法接口的。
}

标签：return,整合,SSM,student,org,import,com,public
From： https://www.cnblogs.com/xiaomubupi/p/18631268

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