Java 如何在Spring引导应用程序中配置servlet init param

我有一个使用SpringMVC的SpringBoot应用程序（版本1.2.1.RELEASE），我需要在JspServlet上设置developmentinit参数。在web.xml中，这将如下所示：

<servlet>
        <servlet-name>jsp</servlet-name>
        <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
        ...
        <init-param>
            <param-name>development</param-name>
            <param-value>false</param-value>
        </init-param>
         ...
</servlet>

另外，我们有一个非常黑客的方法来实现这一点，实现了TomcatEmbeddedServletContainerFactory，并提供了一个servlet，其中我们覆盖了ServletConfig的init方法和getInitParameter方法，但这有点令人讨厌，因此我希望有更好的方法。任何指导都将不胜感激

最后，读取此init参数的代码位于org.apache.jasper.EmbeddedServletOptions类中，并且似乎只查找ServletConfig init参数，因此我不能将其指定为具有类似server.context parameters.name=value的出色特性的上下文参数（我不认为）

String development = config.getInitParameter("development");
if (development != null) {
    if (development.equalsIgnoreCase("true")) {
        this.development = true;
    } else if (development.equalsIgnoreCase("false")) {
        this.development = false;
    } else {
        if (log.isWarnEnabled()) {
            log.warn(Localizer.getMessage("jsp.warning.development"));
        }
    }

}

如果我尝试点击应用程序，我会得到以下错误：

java.lang.StringIndexOutOfBoundsException: String index out of range: 0
at java.lang.String.charAt(String.java:646)
at org.apache.jasper.compiler.JspUtil.makeJavaIdentifier(JspUtil.java:833)
at org.apache.jasper.compiler.JspUtil.makeJavaIdentifier(JspUtil.java:806)
at org.apache.jasper.JspCompilationContext.getServletClassName(JspCompilationContext.java:332)
at org.apache.jasper.JspCompilationContext.getClassFileName(JspCompilationContext.java:504)
at org.apache.jasper.compiler.Compiler.isOutDated(Compiler.java:444)
at org.apache.jasper.compiler.Compiler.isOutDated(Compiler.java:408)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:557)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:291)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:186)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration$MetricsFilter.doFilterInternal(MetricFilterAutoConfiguration.java:90)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:534)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)

---

有人为我找到了这个链接，它看起来很有用，所以我会继续使用它，除非有人想出更好的选择-

---

或者，您也可以将参数添加到application.properties文件中，如下所述： 寻找：
init参数。*=#用于配置jsp servlet的init参数

例如：

server.jsp-servlet.init-parameters.development=true

---

你链接到的答案应该有用。

ServletRegistrationBean

将向Tomcat注册

JspServlet

，然后Tomcat将调用

init（ServletConfig）

方法。你试过了吗？是的，我试过了，并且认为它不起作用，因为NullPointerException。但是，在进一步调查之后，将在servlet上调用init（ServletConfig），并初始化jspservlet。null指针是在初始化之前调用JspServlet.PeriodiceEvent（）的结果，因此rctxt为null，但它似乎是稍后设置的。也许我的问题是我不知道如何使DispatcherServlet和jsp servlet一起工作。

    @Bean
public EmbeddedServletContainerCustomizer customizer() {
    return new EmbeddedServletContainerCustomizer() {

        @Override
        public void customize(ConfigurableEmbeddedServletContainer container) {
            if (container instanceof TomcatEmbeddedServletContainerFactory) {
                customizeTomcat((TomcatEmbeddedServletContainerFactory) container);
            }
        }

        private void customizeTomcat(
                TomcatEmbeddedServletContainerFactory tomcat) {
            tomcat.addContextCustomizers(new TomcatContextCustomizer() {
                @Override
                public void customize(Context context) {
                    Wrapper jsp = (Wrapper) context.findChild("jsp");
                    jsp.addInitParameter("development", development);
                }
            });
        }
    };
}

server.jsp-servlet.init-parameters.development=true