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动态定义bean

关键词: bean

动态定义bean

TheUser.java(简单类)

```
package com.drycms.cloud.api.bean;

import com.alibaba.fastjson.JSONObject;

public class TheUser {

public Integer id;

public String name;

public TheUser() {

}

public TheUser(Integer id, String name) {
        this.id = id;
        this.name = name;
    }

public String toJsonString() {
        return JSONObject.toJSONString(this);
    }

}
```

BeanTool.java(工具类)

```
package com.drycms.cloud.api.bean;

import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.stereotype.Component;

@Component
public class BeanTool {

public final ConfigurableApplicationContext context;

public <T> T registerBean(String name, Class<T> clazz, Object... args) {
        BeanDefinitionBuilder b = BeanDefinitionBuilder.genericBeanDefinition(clazz);
        if (args.length > 0) {
            for (Object arg : args) {
                b.addConstructorArgValue(arg);
            }
        }
        BeanDefinition d = b.getRawBeanDefinition();
        BeanDefinitionRegistry f = (BeanDefinitionRegistry) context.getBeanFactory();
        f.registerBeanDefinition(name, d);
        return context.getBean(name, clazz);
    }

public BeanTool(ConfigurableApplicationContext context) {
        this.context = context;
        init();
    }

public void init() {
        TheUser theUser1 = registerBean("theUser1", TheUser.class);
        theUser1.id = 1;
        theUser1.name = "tom";
        registerBean("theUser2", TheUser.class, 2, "java");
    }

}
```

UseController.java(测试使用)

```
package com.drycms.cloud.api.controller;

import com.drycms.cloud.api.bean.TheUser;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
public class UseController {

@Resource(name = "theUser1")
    TheUser theUser1;

@Resource(name = "theUser2")
    TheUser theUser2;

@RequestMapping(method = RequestMethod.GET, path = "api/bean")
    public Object apiBean() {
        System.out.println("=====");
        System.out.println(theUser1.toJsonString());
        System.out.println(theUser2.toJsonString());
        System.out.println("=====");
        return "ok";
    }

}
```

admin
2022-09-14 23:25:30
phantoscope

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动态定义bean