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Servlet On Springboot

  • Servlet组件扫描

    • @org.springframework.boot.web.servlet.ServletComponentScan
      • 指定包路径扫描
        • String[] value() default{}
        • String[] basePackage() default{}
      • Class<?> basePackageClasses() default {}

  • 注解方式注册

    • Servlet
    • Filter
      • 1.实现javax.servlet.Filter
        • @org.springframework.web.filter.OncePerRequestFilter
    • 监听器

    image-20210221201247932

    代码：

    @WebServlet(
        name = "myServlet",
        urlPatterns = "/myservlet",
        initParams = {
                @WebInitParam(name = "myname", value = "myvalue")
        }
)
public class MyServlet extends HttpServlet {
    private String value;

    public void init(ServletConfig servletConfig) throws ServletException {
        super.init(servletConfig);
        value = servletConfig.getInitParameter("myname");
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Writer writer = resp.getWriter();

        ServletContext servletContext = req.getServletContext();

        servletContext.log("myServlet doGet...");

        writer.write("<html><body>Hello,World, My value = " + value + "</body></html>");
    }
}
    @WebFilter(servletNames = "myServlet")
public class MyFilter extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {

        ServletContext servletContext = request.getServletContext();

        servletContext.log("/myservlet was filtered");

        filterChain.doFilter(request, response);
    }
}
    @WebListener
public class MyServletRequestListener implements ServletRequestListener {
    @Override
    public void requestInitialized(ServletRequestEvent sre) {
        HttpServletRequest request = (HttpServletRequest) sre.getServletRequest();

        ServletContext servletContext = request.getServletContext();

        servletContext.log("request was Initialized");
    }

    @Override
    public void requestDestroyed(ServletRequestEvent sre) {
        HttpServletRequest request = (HttpServletRequest) sre.getServletRequest();

        ServletContext servletContext = request.getServletContext();

        servletContext.log("request was Destroyed");
    }
}

  • Springboot API方式注册

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代码：

public class MyServlet2 extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Writer writer = resp.getWriter();

        ServletContext servletContext = req.getServletContext();

        servletContext.log("myServlet doGet...");

        writer.write("<html><body>Hello,World From MyServlet2</body></html>");
    }
}
public class MyFilter2 extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {

        doSomething();

        filterChain.doFilter(request, response);

    }

    public void doSomething() {
        RequestAttributes requestAttribute = RequestContextHolder.getRequestAttributes();

        ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) requestAttribute;

        HttpServletRequest request = servletRequestAttributes.getRequest();

        ServletContext servletContext = request.getServletContext();

        String requestURI = request.getRequestURI();

        servletContext.log(requestURI + " was filtered");
    }
}
	@Bean
    public static ServletRegistrationBean servletRegistrationBean() {
	    ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();

	    servletRegistrationBean.setServlet(new MyServlet2());
	    servletRegistrationBean.setName("my-servlet2");
	    servletRegistrationBean.addUrlMappings("/springboot/myservlet2");
	    servletRegistrationBean.addInitParameter("myname", "myvalue");

	    return servletRegistrationBean;
    }

    @Bean
    public static FilterRegistrationBean filterRegistrationBean() {
	    FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();

	    filterRegistrationBean.setFilter(new MyFilter2());
	    filterRegistrationBean.addServletNames("my-servlet2");
	    filterRegistrationBean.setDispatcherTypes(DispatcherType.REQUEST, DispatcherType.FORWARD, DispatcherType.INCLUDE);

	    return filterRegistrationBean;
    }

    @Bean
    public static ServletListenerRegistrationBean servletListenerRegistrationBean() {
	    ServletListenerRegistrationBean servletListenerRegistrationBean = new ServletListenerRegistrationBean();

	    servletListenerRegistrationBean.setListener(new MyServletRequestListener());
	    return servletListenerRegistrationBean;

    }

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