getServletContext() and getServletConfig()

本文详细解释了在Servlet中如何通过getServletConfig()和getServletContext()方法获取初始化参数,并阐述了这两种方式的区别及其应用场景。

String s1 = getServletConfig().getInitParameter("P1");
String s2 = getServletContext().getInitParameter("P1");
String s3 = getServletConfig().getServletContext().getInitParameter("P1");
String s4 = getInitParameter("P1");

 

1:getServletContext()取得的是 配置的参数 getServletConfig()取得的是 配置的参数

2: getServletContext()应用于整个web App,而getServletConfig()仅应用于当前Servlet。 但是ServletConfig对象拥ServletContext的引用。所以可以通过getServletConfig()来获得web App的 初始值。

进行了上述修改又出现了以下报错该如何处理:An attempt was made to call a method that does not exist. The attempt was made from the following location: org.springframework.boot.autoconfigure.condition.OnWarDeploymentCondition.getMatchOutcome(OnWarDeploymentCondition.java:42) The following method did not exist: 'jakarta.servlet.ServletContext org.springframework.web.context.WebApplicationContext.getServletContext()' The calling method's class, org.springframework.boot.autoconfigure.condition.OnWarDeploymentCondition, was loaded from the following location: jar:file:/C:/Users/25686/.m2/repository/org/springframework/boot/spring-boot-autoconfigure/3.4.7/spring-boot-autoconfigure-3.4.7.jar!/org/springframework/boot/autoconfigure/condition/OnWarDeploymentCondition.class The called method's class, org.springframework.web.context.WebApplicationContext, is available from the following locations: jar:file:/C:/Users/25686/.m2/repository/org/springframework/spring-web/5.3.20/spring-web-5.3.20.jar!/org/springframework/web/context/WebApplicationContext.class The called method's class hierarchy was loaded from the following locations: org.springframework.web.context.WebApplicationContext: file:/C:/Users/25686/.m2/repository/org/springframework/spring-web/5.3.20/spring-web-5.3.20.jar Action: Correct the classpath of your application so that it contains compatible versions of the classes org.springframework.boot.autoconfigure.condition.OnWarDeploymentCondition and org.springframework.web.context.WebApplicationContext
07-20
评论
成就一亿技术人!
拼手气红包6.0元
还能输入1000个字符
 
红包 添加红包
表情包 插入表情
 条评论被折叠 查看
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值