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=${random.long}#随便uuiduser.random.uuid=${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();}