我想检查我的字符串末尾是否存在一个数字,然后将这个数字(一个 id(传递给我的函数。这是我目前意识到的:
String call = "/webapp/city/1";
String pathInfo = "/1";
if (call.equals("/webapp/city/*")) { //checking (doesn't work)
String[] pathParts = pathInfo.split("/");
int id = pathParts[1]; //desired result : 1
(...)
} else if (...)
错误:
java.lang.RuntimeException: Error :/webapp/city/1
您可以使用
matches(...)
String
方法来检查字符串是否与给定模式匹配:
if (call.matches("/webapp/city/\d+")) {
... // ^^^
// |
// One or more digits ---+
}
获得匹配项后,您需要获取split
的元素[2]
,并使用Integer.parseInt(...)
方法将其解析为int
:
int id = Integer.parseInt(pathParts[2]);
final String call = "http://localhost:8080/webapp/city/1";
int num = -1; //define as -1
final String[] split = call.split("/"); //split the line
if (split.length > 5 && split[5] != null) //check if the last element exists
num = tryParse(split[5]); // try to parse it
System.out.println(num);
private static int tryParse(String num)
{
try
{
return Integer.parseInt(num); //in case the character is integer return it
}
catch (NumberFormatException e)
{
return -1; //else return -1
}
}