Spring Boot 配置随机数的技巧代码详解

#随机32位MD5字符串
user.random.secret=${random.value}
#随机int数字
user.random.intNumber=${random.int}
#随机long数字
user.random.longNumber=${random.long}
#随便uuid
user.random.uuid=${random.uuid}
#随机10以内的数字
user.random.lessTen=${random.int(10)}
#随机1024~65536之内的数字
user.random.range=${random.int[1024,65536]}

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
@Component
@ConfigurationProperties(prefix = "user.random")
@PropertySource(value = { "config/random.properties" })
public class RandomConfig {
  private String secret;
  private int intNumber;
  private int lessTen;
  private int range;
  private long longNumber;
  private String uuid;
  public String getSecret() {
    return secret;
  }
  public void setSecret(String secret) {
    this.secret = secret;
  }
  public int getIntNumber() {
    return intNumber;
  }
  public void setIntNumber(int intNumber) {
    this.intNumber = intNumber;
  }
  public int getLessTen() {
    return lessTen;
  }
  public void setLessTen(int lessTen) {
    this.lessTen = lessTen;
  }
  public int getRange() {
    return range;
  }
  public void setRange(int range) {
    this.range = range;
  }
  public long getLongNumber() {
    return longNumber;
  }
  public void setLongNumber(long longNumber) {
    this.longNumber = longNumber;
  }
  public String getUuid() {
    return uuid;
  }
  public void setUuid(String uuid) {
    this.uuid = uuid;
  }
}

org.springframework.boot.context.config.RandomValuePropertySource

public RandomValuePropertySource(String name) {
  super(name, new Random());
}
private Object getRandomValue(String type) {
  if (type.equals("int")) {
    return getSource().nextInt();
  }
  if (type.equals("long")) {
    return getSource().nextLong();
  }
  String range = getRange(type, "int");
  if (range != null) {
    return getNextIntInRange(range);
  }
  range = getRange(type, "long");
  if (range != null) {
    return getNextLongInRange(range);
  }
  if (type.equals("uuid")) {
    return UUID.randomUUID().toString();
  }
  return getRandomBytes();
}