[ Spring Boot ] Bean 单例注入

Spring Boot 注入Bean

一、@Bean方式

1、在WebMvcConfigurerAdapter的子类中添加@Bean,返回实例对象即可

package cn.com.showclear.plan.impl.plan;/** * 测试 * * @author YF-XIACHAOYANG * @date 2017/12/13 18:04 */public class TestBean {    private String name;    /*可以自定义构造器*/    public TestBean(String name) {        this.name = name;    }    public String getName() {        return name;    }    public TestBean setName(String name) {        this.name = name;        return this;    }    public void hello() {        System.out.println(this.name);    }}

@Bean注入

package cn.com.showclear.config;@SpringBootApplication@ComponentScan(basePackages = "cn.com.showclear")@EnableSchedulingpublic class WebMvcConfig extends WebMvcConfigurerAdapter {    ...    @Bean    public TestBean getTestBean() {        return new TestBean("hello bean1!");    }}

2、使用@Autowired引用TestBean

@RestController@RequestMapping("/data/plan/config/")public class PlanConfigController {    @Autowired    private TestBean testBean;         /**     * 加载预案应急事件标签组[含有组内标签信息]     *     * @return     */    @RequestMapping(value = "loadTagGroupList", method = RequestMethod.POST)    public RespMapJson loadTagGroupList(String groupName) {        testBean.hello();        return planConfigService.load(planHandleDeliver.getTagConfigHandle().init(this, groupName));    }

2、@Component方式

1、Bean定义

package cn.com.showclear.plan.impl.plan;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;/** * 测试 * * @author YF-XIACHAOYANG * @date 2017/12/13 18:04 */@Componentpublic class TestBean2 {    @Autowired    private TestBean testBean;    private String name;    /**     * 构造器必须是无参构造器     */    public TestBean2() {        this.name ="TestBean2";    }    public String getName() {        return name;    }    public TestBean2 setName(String name) {        this.name = name;        return this;    }    public void hello() {        System.out.println(name);    }    public void hello2() {        System.out.println(testBean.getName());    }}

2、使用方式和方式一相同

...    @Autowired    private TestBean2 testBean2;    /**     * 加载预案应急事件标签组[含有组内标签信息]     *     * @return     */    @RequestMapping(value = "loadTagGroupList", method = RequestMethod.POST)    public RespMapJson loadTagGroupList(String groupName) {        testBean2.hello();        testBean2.hello2();        return planConfigService.load(planHandleDeliver.getTagConfigHandle().init(this, groupName));    }

console: