计算机 · 2021年12月19日 0

Java Servlet

Servlet 3.0 Annotations

Servlet 3.0引入的annotations：

总结：

Annotationweb.xml equivalentComponent Usage
@WebServlet<servlet>Servlet classes typically extending javax.servlet.http.HttpServlet
@WebFilter<filter>Servlet Filter class implementing javax.servlet.Filter
@WebInitParam<init-param>Servlet and Filter classes
@WebListener<listener>classes implementing: javax.servlet.ServletContextListener, javax.servlet.ServletContextAttributeListener, javax.servlet.ServletRequestListener, javax.servlet.ServletRequestAttributeListener, javax.servlet.http.HttpSessionListener, javax.servlet.http.HttpSessionAttributeListener
@MultipartConfig<multipart-config>Servlet classes responsible for file upload on multipart/form-data requests
@ServletSecurity @HttpMethodConstraint @HttpConstraint<security-constraint>Servlet classes specifying security constraints
@HandlesTypesNot availableClass implementing javax.servlet.ServletContainerInitializer. This is a new pluggability mechanism introduced in Servlet 3.0

用@WebServlet注解创建Servlet

可以在web.xml中用@WebServlet注解创建Servlet组件。

<servlet>
    <servlet-name>viewController</servlet-name>
    <servlet-class>com.logicbig.servlet.ViewController</servlet-class>
    <init-param><param-name>renderer-class-name</param-name>
        <param-value>com.logicbig.HtmlRenderer</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

......

<servlet-mapping>
    <servlet-name>viewController</servlet-name>
    <url-pattern>/view/*</url-pattern>
</servlet-mapping>

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