應用場景
在以前的web項目，servlet常用與特殊處理，比如驗證碼的實作，對外暴露http接口等等，重要性不言而喻。
springboot也有自己的實作servlet的方式。
-
代碼注冊servlet
通過ServletRegistrationBean、FilterRegistrationBean、ServletListenerRegistrationBean、ServletContextInitializer
案例采用通過ServletRegistrationBean注冊實作
-
注解注冊servlet
比較友善，首先再SpringBootApplication（springboot項目入口）上添加@ServletComponentScan注解，其次，是自定義Servlet上添加@WebServlet注解
一、代碼注冊實作
自定義servlet MyServlet.java
// 方法二：通過@WebServlet
//@WebServlet(urlPatterns = "/myServlet.view",description = "這事我自定義的servlet")
public class MyServlet extends HttpServlet {
private final Logger _logger = LoggerFactory.getLogger(this.getClass());
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
_logger.info("===========doGet()============");
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
_logger.info("===========doPost()============");
resp.setCharacterEncoding("utf-8");
resp.setContentType("text/html");
PrintWriter out = resp.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Hello World</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>這是我自定義的Servlet</h1>");
out.println("</body>");
out.println("</html>");
}
}
自定義配置檔案
@Configuration
public class ServertConfig {
/**
* 方法一：通過ServletRegistrationBean注冊
* @return
*/
@Bean
public ServletRegistrationBean servletRegistrationBean(){
return new ServletRegistrationBean(new MyServlet(),"/myServlet/*") ;
}
}
程式入口
@SpringBootApplication
//@ServletComponentScan(basePackages = "com.hsy.springboot.servlet")
public class SpringBootServletApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootServletApplication.class,args);
}
}
項目結構圖
二、注解實作
1.将程式入口的//@ServletComponentScan(basePackages = “com.hsy.springboot.servlet”) 解注釋
2.将MyServlet 中的 //@WebServlet(urlPatterns = “/myServlet.view”,description = “這事我自定義的servlet”) 解注釋。
源碼
springboot-servlet
曆史文章
SpringBoot實戰之入門
springboot實戰之文章彙總
springboot實戰之讀取配置檔案
springboot實戰之整合jsp模版引擎
springboot實戰之整合freemarker模版引擎
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