java – 最后关闭连接和语句
哪个更适合finally块：
finally {
try {
con.close();
stat.close();
} catch (SQLException sqlee) {
sqlee.printStackTrace();
}
}
要么：
finally {
try {
if (con != null) {
con.close();
}
if (stat != null) {
stat.close();
}
} catch (SQLException sqlee) {
sqlee.printStackTrace();
}
}
更好的使用方法是第二种方法,因为如果在初始化con或stat时抛出异常,它们将不会被初始化,并且可能会被初始化为null.在这种情况下,使用第一个代码将抛出NullPointerException.
此外,如果您已经使用Java 7,则应考虑使用
try-with-resources
,它会自动关闭资源.从链接的教程：
The try-with-resources statement ensures that each resource is closed at the end of the statement. Any object that implements java.lang.AutoCloseable, which includes all objects which implement java.io.Closeable, can be used as a resource.
翻译自：https://stackoverflow.com/questions/18114905/close-connection-and-statement-finally
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