Springboot整合web開發

一，整合 Servlet
1，通過注解掃描完成 Servlet 組件的注冊
1.1 編寫 servlet

/**
 * 
 * springboot整合servlet方式一
 * @author java
 *<servlet>
 *    <servlet-name>FirstServletController</servlet-name>
 *    <servlet-class>com.zzp.controller.FirstServletController</servlet-class>
 *</servlet>
 *<servlet-mapping>
 *    <servlet-name>FirstServletController</servlet-name>
 *    <url-pattern>/firstServlet</url-pattern>
 *</servlet-mapping>
 */
@WebServlet(name="FirstServletController",urlPatterns="/firstServlet")
public class FirstServletController extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {    
        System.out.println("FirstServlet。。。。。。。。。。。。。");
    }
    
}

1.2 編寫啟動類

/**
 * 
 * springboot整合servlet方式一
 * @author java
 *
 */
@SpringBootApplication
@ServletComponentScan//在servlet啟動時掃描@WebServlet這個注解
public class APP {
    
    public static void main(String[] args) {
    SpringApplication.run(APP.class, args);
    }

}

2，通過方法完成 Servlet 組件的注冊

2.1 編寫 servlet

/**
 * 
 * springboot整合servlet的方式二
 * 
 * @author java
 *
 */
public class SecondServlet extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("secondServlet.................");
    }
    
}

2.2 編寫啟動類

/**
 * 
 * springboot整合servlet的第二種方式
 * 如果第二種方式啟動項目時，端口號被占用了，
 * 則在在src->main->resources目錄下新建一個文件，名稱為：application.properties
 * 設置端口號為server.port = 9527
 * @author java
 *
 */
@SpringBootApplication
public class AppSecond {

    public static void main(String[] args) {
        SpringApplication.run(AppSecond.class, args);
    }
    
    @Bean
    public ServletRegistrationBean getServletRegistrationBean() {
        ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());
        bean.addUrlMappings("/secondServlet");
        return bean;
    }
}

二，整合 Filter

1，通過注解掃描完成 Filter 組件的注冊
1.1 編寫Filter

/**
 * 
 * 方式一：通過注解掃描完成filter組件的注入
 * <filter>
 *     <filter-name></filter-name>
 *     <filter-class></filter-class>
 * </filter>
 * <filter-mapping>
 *     <filter-name></filter-name>
 *     <url-pattern></url-pattern>
 * </filter-mapping>
 * @author java
 *
 */
//@WebFilter(filterName="FirstFilter",urlPatterns={"*.do","*.jsp"})
@WebFilter(filterName="FirstFilter",urlPatterns="/firstServlet")
public class FirstFilter implements Filter{

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        System.out.println("開始進入filter");
        chain.doFilter(request, response);
        System.out.println("離開filter");
    }

    @Override
    public void destroy() {
        // TODO Auto-generated method stub
        
    }
    
}

/**
 * 
 * springboot整合servlet方式一
 * @author java
 *<servlet>
 *    <servlet-name>FirstServletController</servlet-name>
 *    <servlet-class>com.zzp.controller.FirstServletController</servlet-class>
 *</servlet>
 *<servlet-mapping>
 *    <servlet-name>FirstServletController</servlet-name>
 *    <url-pattern>/firstServlet</url-pattern>
 *</servlet-mapping>
 */
@WebServlet(name="FirstServletController",urlPatterns="/firstServlet")
public class FirstServletController extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {    
        System.out.println("FirstServlet。。。。。。。。。。。。。");
    }
    
}

 

1.2 編寫啟動類

@SpringBootApplication
@ServletComponentScan
public class APP01 {

    public static void main(String[] args) {
        SpringApplication.run(APP01.class, args);
    }
}

2，通過方法完成 Filter 組件的注冊

2.1 編寫 Filter

public class SecondFilter implements Filter{

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        System.out.println("開始進入filter");
        chain.doFilter(request, response);
        System.out.println("離開filter");
        
    }

    @Override
    public void destroy() {
        // TODO Auto-generated method stub
        
    }

}

/**
 * 
 * springboot整合servlet的方式二
 * 
 * @author java
 *
 */
public class SecondServlet extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("secondServlet.................");
    }
    
}

2.2 編寫啟動類

/**
 * 
 * springboot通過方法注冊filter的第二種方式
 * @author java
 *
 */
@SpringBootApplication
public class App02 {

    public static void main(String[] args) {
        SpringApplication.run(App02.class, args);
    }
    
    @Bean
    public ServletRegistrationBean getServletRegistrationBean() {
        ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());
        bean.addUrlMappings("/secondServlet");
        return bean;
    }
    
    @Bean
    public FilterRegistrationBean getFilterRegistrationBean() {
        FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());
        //bean.addUrlPatterns(new String[] {"*.do","*.jsp"});
        bean.addUrlPatterns("/secondServlet");
        return bean;
    }
}

 

三，整合 Listener
1，通過注解掃描完成 Listener 組件的注冊
1.1 編寫 Listener

/**
*
* 方法一：通過注解掃描完成 Listener 組件的注冊
* @author java
*<listener>
* <listener-class>com.bjsxt.listener.FirstListener</listener-class>
*</listener>
*/
@WebListener
public class FirstListener implements ServletContextListener{

@Override
public void contextInitialized(ServletContextEvent sce) {
System.out.println("listener....init....");
}

@Override
public void contextDestroyed(ServletContextEvent sce) {

}

}

1.2 編寫啟動類

/**
 * 
 * 方法一：通過注解掃描完成 Listener 組件的注冊
 * @author java
 *
 */
@SpringBootApplication
@ServletComponentScan
public class App01 {

    public static void main(String[] args) {
        SpringApplication.run(App01.class, args);
    }

}

2. 通過方法完成 Listener 組件注冊

2.1 編寫 Listen

/**
 * 
 * springboot注冊listener的方式二
 * @author java
 *
 */
public class SecondListener implements ServletContextListener{

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        System.out.println("SecondListener...init...");
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        // TODO Auto-generated method stub
        
    }
    
}

2.2 編寫啟動類

/**
 * 
 * springboot注冊listener的方式二
 * @author java
 *
 */
@SpringBootApplication
public class App02 {
    public static void main(String[] args) {
        SpringApplication.run(App02.class, args);
    }
    
    @Bean
    public ServletListenerRegistrationBean<SecondListener> getServletListenerRegistrationBean(){
        ServletListenerRegistrationBean<SecondListener> bean = new ServletListenerRegistrationBean<SecondListener>(new SecondListener());
        return bean;
    }
}

 四，訪問靜態資源

1. SpringBoot 從 classpath/static的目錄

注意目錄名稱必須是 static

2. ServletContext 根目錄下

在 src/main/webapp 目錄名稱必須要 webapp

 五，文件上傳

1. 編寫 Controller

/**
 * 
 * 文件上傳
 * @author java
 *
 */
@RestController
public class FileUploadController {
    @RequestMapping("/fileUploadController")
    public Map<String,Object> getUploadFile(MultipartFile filename) throws IllegalStateException, IOException{
        System.out.println(filename.getOriginalFilename());
        filename.transferTo(new File("e:/"+filename.getOriginalFilename()));
        Map<String,Object> map = new HashMap<String, Object>();
        map.put("msg", "ok");
        return map;
    }
}

2. 編寫啟動類

@SpringBootApplication
public class App {

    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }

}

3. 設置上傳文件大小的默認值

#設置上傳文件的大小
spring.http.multipart.maxFileSize=200MB
#設置上傳文件的總大小
spring.http.multipart.maxRequestSize=200MB