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16整合mybiatis-plus ​

整合mybatis-plus，使用前后端分离的方式开发CURD。

16.1 搭建MVC的程序 ​

16.2 整合Mybaits-Plus ​

1.逆向工程添加依赖 ​

xml
 <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.3.2</version>
            <scope>test</scope>
        </dependency>


        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.31</version>
            <scope>test</scope>
        </dependency>

2.代码生成器 ​

java
package com.neuedu.mp;

import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.InjectionConfig;
import com.baomidou.mybatisplus.generator.config.*;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class AutoCode {


    /**
     * <p>
     * 读取控制台内容
     * </p>
     */


    public static void main(String[] args) {
        // 代码生成器
        AutoGenerator mpg = new AutoGenerator();

        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        String projectPath = System.getProperty("user.dir")+"/11-boot-ssm-plus/";


        gc.setOutputDir(projectPath + "src/main/java");
        gc.setAuthor("金山");
        gc.setOpen(false);
        // gc.setSwagger2(true); 实体属性 Swagger2 注解
        mpg.setGlobalConfig(gc);

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://localhost:3306/ssm-java1?useUnicode=true&useSSL=false&characterEncoding=utf8");
        // dsc.setSchemaName("public");
        dsc.setDriverName("com.mysql.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("root");
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
//        pc.setModuleName(scanner("模块名"));
        pc.setParent("com.neuedu.his");
        mpg.setPackageInfo(pc);

        // 自定义配置
        InjectionConfig cfg = new InjectionConfig() {
            @Override
            public void initMap() {
                // to do nothing
            }
        };

        // 如果模板引擎是 freemarker
        String templatePath = "/templates/mapper.xml.ftl";
        // 如果模板引擎是 velocity
        // String templatePath = "/templates/mapper.xml.vm";

        // 自定义输出配置
        List<FileOutConfig> focList = new ArrayList<>();
        // 自定义配置会被优先输出
        focList.add(new FileOutConfig(templatePath) {
            @Override
            public String outputFile(TableInfo tableInfo) {
                // 自定义输出文件名 ， 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化！！
                return projectPath + "/src/main/resources/com/neuedu/his/mapper/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });
        /*
        cfg.setFileCreate(new IFileCreate() {
            @Override
            public boolean isCreate(ConfigBuilder configBuilder, FileType fileType, String filePath) {
                // 判断自定义文件夹是否需要创建
                checkDir("调用默认方法创建的目录，自定义目录用");
                if (fileType == FileType.MAPPER) {
                    // 已经生成 mapper 文件判断存在，不想重新生成返回 false
                    return !new File(filePath).exists();
                }
                // 允许生成模板文件
                return true;
            }
        });
        */
        cfg.setFileOutConfigList(focList);
        mpg.setCfg(cfg);

        // 配置模板
        TemplateConfig templateConfig = new TemplateConfig();

        // 配置自定义输出模板
        //指定自定义模板路径，注意不要带上.ftl/.vm, 会根据使用的模板引擎自动识别
        // templateConfig.setEntity("templates/entity2.java");
        // templateConfig.setService();
        // templateConfig.setController();

        templateConfig.setXml(null);
        mpg.setTemplate(templateConfig);

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
//        strategy.setSuperEntityClass("你自己的父类实体,没有就不用设置!");
        strategy.setEntityLombokModel(true);
        strategy.setRestControllerStyle(true);
        // 公共父类
//        strategy.setSuperControllerClass("你自己的父类控制器,没有就不用设置!");
        // 写于父类中的公共字段
//        strategy.setSuperEntityColumns("id");
//        strategy.setInclude(scanner("表名，多个英文逗号分割").split(","));
//        strategy.setControllerMappingHyphenStyle(true);
        strategy.setTablePrefix(pc.getModuleName() + "_");
        mpg.setStrategy(strategy);
        mpg.setTemplateEngine(new FreemarkerTemplateEngine());
        mpg.execute();
    }

}

3.整合mybaits-plus ​

添加mybatis-plus依赖

xml
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springboot-learn-parent</artifactId>
        <groupId>com.neuedu.boot</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <packaging>jar</packaging>
    <artifactId>11-boot-ssm-plus</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>


        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>


        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.3.2</version>
            <scope>test</scope>
        </dependency>


        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.31</version>
            <scope>test</scope>
        </dependency>


    </dependencies>


</project>

4.添加数据源 ​

yaml
spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/ssm-java1?useUnicode=true&useSSL=false&characterEncoding=utf8
    username: root
    password: root

5. @MapperScan ​

在主运行类上加@MapperScan("com.neuedu.his.mapper")注解

java
package com.neuedu.his;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.neuedu.his.mapper")
public class App11 {


    public static void main(String[] args) {

        SpringApplication.run(App11.class, args);

    }
}

6.单元测试 ​

java
package com.neuedu.his.mapper;

import com.neuedu.his.App11;
import com.neuedu.his.entity.Menu;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;

import java.util.List;

import static org.junit.jupiter.api.Assertions.*;

@SpringBootTest(classes = App11.class)
class MenuMapperTest {

    @Resource
    MenuMapper mapper;

    @Test
    public void test1(){
        List<Menu> list = mapper.selectList(null);
        for (Menu menu : list) {
            System.out.println(menu);
        }
    }

}

7.分页插件 ​

java
package com.neuedu.his.common;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.pagination.dialects.MySqlDialect;
import com.baomidou.mybatisplus.extension.plugins.pagination.optimize.JsqlParserCountOptimize;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AppConfig {

    /**
     * 分页插件
     * @return
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        paginationInterceptor.setDialect(new MySqlDialect());
        paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize(true));
        return paginationInterceptor;
    }
}

8.封装统一的json响应结果 ​

封装统一的返回结果

状态码常量

java
package com.neuedu.his.common;

import lombok.Getter;

@Getter
public enum ResultCode {
    NOHANDLER(404,"请求地址错误"),
    SUCCESS(200,"操作成功"),
    FAILED(500,"操作失败"),
    NOTOKEN(401,"未登录或登录已超时"),
    NOPERMISS(403,"无操作权限"),
    ;

    private Integer code;
    private String message;

    ResultCode(Integer code, String message) {
        this.code = code;
        this.message = message;
    }



}

CommonResult

java
package com.neuedu.his.common;

import lombok.Getter;

import java.io.Serializable;

@Getter
public class CommonResult  {
    private Integer code;
    private String message;
    private Object obj;

    private CommonResult(Integer code, String message, Object obj) {
        this.code = code;
        this.message = message;
        this.obj = obj;
    }

    public static CommonResult nohandler() {
        return new CommonResult(ResultCode.NOHANDLER.getCode(), ResultCode.NOHANDLER.getMessage(),null);
    }
    public static CommonResult success(Object obj) {
        return new CommonResult(ResultCode.SUCCESS.getCode(), ResultCode.SUCCESS.getMessage(),obj);
    }
    public static CommonResult failed() {
        return new CommonResult(ResultCode.FAILED.getCode(), ResultCode.FAILED.getMessage(),null);
    }
    public static CommonResult failed(String message) {
        return new CommonResult(ResultCode.FAILED.getCode(),message,null);
    }
    public static CommonResult notoken() {
        return new CommonResult(ResultCode.NOTOKEN.getCode(), ResultCode.NOTOKEN.getMessage(),null);
    }
    public static CommonResult nopremiss() {
        return new CommonResult(ResultCode.NOPERMISS.getCode(), ResultCode.NOPERMISS.getMessage(),null);
    }
}

9.统一的全局异常处理器 ​

​ 配置全局的异常处理器，以及利用异常处理器配置404的通用返回结果（需要添加如下配置）

yaml
spring:
  mvc:
    throw-exception-if-no-handler-found: true
  web:
    resources:
      add-mappings: false
java
package com.neuedu.his.common;

import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.NoHandlerFoundException;

import javax.servlet.http.HttpServletRequest;

@RestControllerAdvice
public class DefaultExceptionHandler {

    @ExceptionHandler
    public CommonResult exceptionHandler(HttpServletRequest request, Exception ex) {
        ex.printStackTrace();
        if(ex instanceof NoHandlerFoundException) {
            return CommonResult.nohandler();
        }
        return CommonResult.failed(ex.getMessage());
    }


}

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