实体类注入service并使用service

实体类注入service并使用service

1. 创建手动注入的处理器

package com.felixfei.demo.config;

import org.springframework.beans.BeansException;

import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

import org.springframework.stereotype.Component;

/**
 * @Author felix fei
 * @Date 2021/3/19 0019 10:30
 * @Version 1.0.1
 * @describe: 手动注入类的处理器
 */
@Component
public class BeanContext implements ApplicationContextAware {
    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext)
        throws BeansException {
        BeanContext.applicationContext = applicationContext;
    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) throws BeansException {
        return (T) applicationContext.getBean(name);
    }

    public static <T> T getBean(Class<T> clz) throws BeansException {
        return (T) applicationContext.getBean(clz);
    }
}

2. 创建service

package com.example.demo.service;

import com.example.demo.model.User;

import java.util.List;
import java.util.Map;


/**
 * @Author felix fei
 * @Date 2021/1/28 0028 14:58
 * @Version 1.0.1
 * @describe:
 */
public interface DemoService {
    List<Map<String, Object>> listMap();

    List<User> listEntity();

    void add(User body);

    List<Map<String, Object>> dmGetMethod();
}

3. 创建serviceImpl

package com.example.demo.service.impl;

import com.example.demo.mapper.DemoMapper;
import com.example.demo.model.User;
import com.example.demo.service.DemoService;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;

import javax.annotation.Resource;


/**
 * @Author felix fei
 * @Date 2021/1/28 0028 14:58
 * @Version 1.0.1
 * @describe:
 */
@Service
public class DemoServiceImpl implements DemoService {
    @Resource
    private DemoMapper demoMapper;

    @Override
    public List<Map<String, Object>> listMap() {
        return demoMapper.listMap();
    }

    @Override
    public List<User> listEntity() {
        return demoMapper.listEntity();
    }

    @Override
    public void add(User body) {
        demoMapper.insert(body);
    }

    @Override
    public List<Map<String, Object>> dmGetMethod() {
        return demoMapper.dmGetMethod();
    }
}

4. 在实体类中调用service服务

package com.example.demo.model;

import com.example.demo.config.BeanContext;
import com.example.demo.service.impl.DemoServiceImpl;

import lombok.Data;

import java.util.List;


/**
 * @Author felix fei
 * @Date 2021/3/4 0004 9:43
 * @Version 1.0.1
 * @describe:
 */
@Data
public class TestModel {
    private String store;
    private int storeage;

    public void testUseService() {
        // 进行service调用
        DemoServiceImpl demoService = BeanContext.getApplicationContext()
                                                 .getBean(DemoServiceImpl.class);
        List<User> users = demoService.listEntity();
        System.out.println("获取到的数据=" + users.toString());
    }
}
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