Error configuring application listener of class org.springframework.web.context.ContextLoaderListener的问题解决
严重: Error configuring application listener of class org.springframework.web.context.ContextL
### API介绍
基本函数:
- valueOf(parament):将参数转换为指定的类型
- ```
比如 int a = 3;
BigInteger b = BigInteger.valueOf(a);
则 b = 3;
String s = "12345";
BigInteger c = BigInteger.valueOf(s);