在项目中我们可以使用@PostConstruct去初始化一些操作
例如
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| package com.ruben;
import com.ruben.dao.MpUserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import javax.annotation.PostConstruct;
import javax.annotation.Resource;
@SpringBootTest
class SimpleSpringbootApplicationTests {
private String name;
@PostConstruct
public void init() {
name = "ruben";
}
@Test
void test() {
System.out.println(name);
}
}
|
被@PostConstruct注解的方法，只会在服务器初始化的时候执行一次，也可以用于把spring容器中的bean置换出来成静态变量
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| package com.ruben;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.ruben.dao.MpUserMapper;
import com.ruben.pojo.dataObject.UserDataObject;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import java.util.List;
@SpringBootTest
class SimpleSpringbootApplicationTests {
private String name;
@Resource
private MpUserMapper mpUserMapper;
private static MpUserMapper staticMpUserMapper;
@PostConstruct
public void init() {
name = "achao";
staticMpUserMapper = mpUserMapper;
}
@Test
void test() {
System.out.println(name);
List<UserDataObject> users = selectList(name);
users.forEach(System.out::println);
}
public static List<UserDataObject> selectList(String name) {
return staticMpUserMapper.selectList(Wrappers.lambdaQuery(UserDataObject.builder().build()).eq(UserDataObject::getUsername, name));
}
}
|
打印结果
