springBoot之Servlet

在web项目开发中,大部分情况下,都是通过Spring默认的DispatcherServlet,转发请求到Controller,我们在Controller里处理请求。但有时候,可能有些请求我们不希望通过Spring,而是通过其他Servlet处理。如果是普通的项目,那可以在web.xml文件中进行配置,但是springBoot中是没有web.xml的。

  在springBoot中有2中方法实现。

      其一:使用注解注册@WebServlet(urlPatterns = "/test/*",initParams = {@WebInitParam(name = "param1", value = "value1"),})

      其二:代码注册ServletRegistrationBean

                 创建一个@Bean,使用:return new ServletRegistrationBean(new TestServlet(), "/test1/");

public class TestServlet extends HttpServlet{
    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        String value=config.getInitParameter("param1");
        log.info("param1:{}",value);

    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        PrintWriter out = resp.getWriter();
        out.println("<html>");
        out.println("<head>");
        out.println("<title>Hello World</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("Hello");
        out.println("</body>");
        out.println("</html>");
    }

 

1  @Bean
2     public ServletRegistrationBean testServletBean() {
3         ServletRegistrationBean testServletRegistration = new ServletRegistrationBean(new TestServlet(), "/test1/");
4         Map<String,String> params = new HashMap<>();
5         params.put("param1","value2");
6         testServletRegistration.setInitParameters(params);
7         return testServletRegistration;
8 
9     }

 

posted @ 2019-10-29 17:27  风中之烛_清  阅读(719)  评论(0编辑  收藏  举报