Spring Boot 自动装配的几种用法示例小结

public class DemoService {
    public String test() {
        return "test";
    }
}

import com.hezy.service.DemoService;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class AutoBeanConfiguration {
    @Bean
    public DemoService testBean() {
        return new DemoService();
    }
}

import com.hezy.service.DemoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/demo")
public class DemoController {
    @Autowired
    private DemoService demoService ;
    @GetMapping
    public String sayHello() {
        return demoService.test();
    }
}

/**
 * 写服务接口
 */
public interface WriteService {
    String write(String content);
}

import org.springframework.stereotype.Service;
/**
 * excel实现类
 */
@Service("excel")
public class ExcelServiceIImpl implements WriteService {
    @Override
    public String write(String content) {
        return "excel:" + content;
    }
}

import org.springframework.stereotype.Service;
/**
 * word实现类
 */
@Service("word")
public class WordServiceImpl implements WriteService {
    @Override
    public String write(String content) {
        return "word:" + content;
    }
}

import org.springframework.stereotype.Service;
/**
 * pdf实现类
 */
@Service("pdf")
public class PdfServiceImpl implements WriteService {
    @Override
    public String write(String content) {
        return "pdf:" + content;
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Service;
@Service
public class TestService {
    @Autowired
    private ApplicationContext applicationContext;
    public String test(String type, String content) {
        return applicationContext.getBean(type, WriteService.class).write(content);
    }
}

    @Autowired
    private TestService testService;
    @GetMapping("/write")
    public String write(String type, String content) {
        return testService.test(type, content);
    }

    @Autowired
    private List<WriteService> writeServices;
    public String test2() {
        return writeServices.size() + "";
    }

    @Autowired
    private Map<String, WriteService> writeServiceMap;
    public String test3() {
        return writeServiceMap.size() + "";
    }

    @Autowired
    private Map<String, WriteService> writeServiceMap;
    public String test(String type, String content) {
        return writeServiceMap.get(type).write(content);
    }