SpringBoot如何指定某些类优先启动

时间：2021-01-14 11:15:14|栏目：JAVA代码|点击：次

一、需求

1、项目中对某些IP地址和端口做了限制，只有写在配置文件的内容（ip）才可以访问项目。

2、在进行测试案例运行时保证读取配置文件中ip和port的类（CbeConfig）得提前运行。

二、工作

1、如下的测试时肯定不行

@Test
  public void getCbeTest(){
    CbeConfig cbeConfig = new CbeConfig();
    System.out.println("IP是" + cbeConfig.getIp());
    System.out.println("Port是" + cbeConfig.port);
  }

2、保证CbeConfig类在程序运行起来的那一刻先存在，先写一个读取配置的类，程序运行起来后读取到配置后，然后再将读取的参数设置到另一个类（CbeConfigAfter）中,以后提取参数。都使用CbeConfigAfter。

CbeConfigBefore类实现ApplicationRunner接口的run方法

package com.example.demo;
import lombok.Getter;
import lombok.Setter;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;
@Component
public class CbeConfigBefore implements ApplicationRunner {

 @Value("${cbe.ip}")
 public String ip;


 @Value("${cbe.port}")
 public Integer port;

 @Override
 public void run(ApplicationArguments applicationArguments) throws Exception {
  System.out.println("我第一个启动");
  System.out.println("哈哈ip" + ip);
  System.out.println("哈哈port" + port);
  CbeConfigAfter cbeConfigAfter = CbeConfigAfter.getInstance();
  cbeConfigAfter.setIp(ip);
  cbeConfigAfter.setPort(port);
  System.out.println("设置完毕");
 }

 public String getIp() {
  return ip;
 }

 public void setIp(String ip) {
  this.ip = ip;
 }

 public int getPort() {
  return port;
 }

 public void setPort(int port) {
  this.port = port;
 }
}

CbeConfigAfter类写成单例模式

package com.example.demo;
import lombok.Getter;
import lombok.Setter;
public class CbeConfigAfter {

 public String getIp() {
  return ip;
 }
 public void setIp(String ip) {
  this.ip = ip;
 }
 public int getPort() {
  return port;
 }
 public void setPort(int port) {
  this.port = port;
 }
 String ip;
 int port;
 private static CbeConfigAfter cbeConfigAfter;
 private CbeConfigAfter (){}
 public static synchronized CbeConfigAfter getInstance() {
  if (cbeConfigAfter == null) {
   cbeConfigAfter = new CbeConfigAfter();
  }
  return cbeConfigAfter;
 }
}

测试类

package com.example.demo.controllerTest;

import com.example.demo.CbeConfigAfter;
import com.example.demo.CbeConfigBefore;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.TestPropertySource;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@SpringBootTest
@RunWith(SpringJUnit4ClassRunner.class)
public class CbeTest {
 @Test
 public void getCbeByAfterTest(){
  CbeConfigAfter instance = CbeConfigAfter.getInstance();
  System.out.println("IP是" + instance.getIp());
  System.out.println("端口是" + instance.getPort());
 }

 @Test
 public void getCbeBeforeTest(){
  CbeConfigBefore cbeConfig = new CbeConfigBefore();
  System.out.println("IP是" + cbeConfig.getIp());
  System.out.println("Port是" + cbeConfig.port);
 }
}

此时再运行getCbeByAfterTest测试类，OK，搞定。

虽然搞定，但是我还是仍有心有疑虑，请有幸读完的同志挑挑毛病。谢谢。

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