Spring boot 基于Spring MVC的Web应用和REST服务开发

2017年4月27日

Spring Boot利用JavaConfig配置模式以及“约定优于配置”理念，极大简化了基于Spring MVC的Web应用和REST服务开发。

 

  • Servlet： 
     1 package org.windwant.spring.servlet;
 2 
 3 import javax.servlet.Servlet;
 4 import javax.servlet.ServletConfig;
 5 import javax.servlet.ServletException;
 6 import javax.servlet.ServletRequest;
 7 import javax.servlet.ServletResponse;
 8 import javax.servlet.annotation.WebServlet;
 9 import java.io.IOException;
10 
11 /**
12  * BootSevlet
13  */
14 @WebServlet("/web")
15 public class BootSevlet implements Servlet {
16 
17     @Override
18     public void init(ServletConfig config) throws ServletException {
19         System.out.println("servlet init...");
20     }
21 
22     @Override
23     public ServletConfig getServletConfig() {
24         return null;
25     }
26 
27     @Override
28     public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {
29         System.out.println(req.getServerName());
30         res.getWriter().write("got your message!");
31     }
32 
33     @Override
34     public String getServletInfo() {
35         return null;
36     }
37 
38     @Override
39     public void destroy() {
40         System.out.println("servlet destroy...");
41     }
42 }
  • Service： 
    1 package org.windwant.spring.service;
2 
3 /**
4  * BootService.
5  */
6 public interface BootService {
7     String hello(String name);
8 }
     1 package org.windwant.spring.service.impl;
 2 
 3 import org.springframework.stereotype.Service;
 4 import org.windwant.spring.service.BootService;
 5 
 6 /**
 7  * BootServiceImpl
 8  */
 9 @Service
10 public class BootServiceImpl implements BootService {
11 
12     @Override
13     public String hello(String name){
14         String message = "Hello " + name + ", welcome to my world!";
15         System.out.println(message);
16         return message;
17     }
18 }

     

  • Listener： 
     1 package org.windwant.spring.listener;
 2 
 3 import org.windwant.spring.BootMgr;
 4 
 5 import javax.servlet.ServletContextEvent;
 6 import javax.servlet.ServletContextListener;
 7 import javax.servlet.annotation.WebListener;
 8 
 9 /**
10  * BootListener
11  */
12 @WebListener
13 public class BootListener implements ServletContextListener {
14 
15     @Override
16     public void contextInitialized(ServletContextEvent sce) {
17         System.out.println("listener init... : " + BootMgr.increment());
18     }
19 
20     @Override
21     public void contextDestroyed(ServletContextEvent sce) {
22         System.out.println("listener destroy... : " + BootMgr.decrement());
23     }
24 }
  • Job： 
     1 package org.windwant.spring.job;
 2 
 3 import org.springframework.scheduling.annotation.Scheduled;
 4 import org.springframework.stereotype.Component;
 5 
 6 import java.text.SimpleDateFormat;
 7 import java.util.Date;
 8 
 9 /**
10  * BootJob
11  */
12 @Component
13 public class BootJob {
14 
15     private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
16 
17     @Scheduled(fixedRate = 1000)
18     public void reportTime(){
19         System.out.println("current time is: " +  dateFormat.format(new Date()));
20     }
21 }
  • Interceptor： 
     1 package org.windwant.spring.interceptor;
 2 
 3 import org.springframework.web.servlet.HandlerInterceptor;
 4 import org.springframework.web.servlet.ModelAndView;
 5 
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 /**
10  * BootInterceptor
11  */
12 public class BootInterceptor implements HandlerInterceptor {
13 
14     @Override
15     public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
16         System.out.println("interceptor preHandle...");
17         return true;
18     }
19 
20     @Override
21     public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
22         System.out.println("interceptor postHandle...");
23     }
24 
25     @Override
26     public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
27         System.out.println("interceptor over...");
28     }
29 }
     1 package org.windwant.spring.interceptor;
 2 
 3 import org.springframework.context.annotation.Configuration;
 4 import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
 5 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
 6 
 7 /**
 8  * BootWebConfig
 9  */
10 @Configuration
11 public class BootWebConfig extends WebMvcConfigurerAdapter {
12 
13     @Override
14     public void addInterceptors(InterceptorRegistry registry) {
15         registry.addInterceptor(new BootInterceptor()).addPathPatterns("/**");
16         super.addInterceptors(registry);
17     }
18 }

     

  • Filter： 
     1 package org.windwant.spring.filter;
 2 
 3 import javax.servlet.Filter;
 4 import javax.servlet.FilterChain;
 5 import javax.servlet.FilterConfig;
 6 import javax.servlet.ServletException;
 7 import javax.servlet.ServletRequest;
 8 import javax.servlet.ServletResponse;
 9 import javax.servlet.annotation.WebFilter;
10 import java.io.IOException;
11 
12 /**
13  * BootFilter
14  */
15 @WebFilter
16 public class BootFilter implements Filter {
17 
18     @Override
19     public void init(FilterConfig filterConfig) throws ServletException {
20         System.out.println("filter init...");
21     }
22 
23     @Override
24     public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
25         System.out.println("filter...");
26         filterChain.doFilter(servletRequest, servletResponse);
27     }
28 
29     @Override
30     public void destroy() {
31         System.out.println("filter destroy...");
32     }
33 }
  • BootSpring： 
     1 package org.windwant.spring;
 2 
 3 import org.joda.time.LocalTime;
 4 import org.springframework.beans.factory.annotation.Autowired;
 5 import org.springframework.boot.SpringApplication;
 6 import org.springframework.boot.autoconfigure.SpringBootApplication;
 7 import org.springframework.boot.web.servlet.ServletComponentScan;
 8 import org.springframework.scheduling.annotation.EnableScheduling;
 9 import org.springframework.web.bind.annotation.PathVariable;
10 import org.springframework.web.bind.annotation.RequestMapping;
11 import org.springframework.web.bind.annotation.RestController;
12 import org.windwant.spring.service.BootService;
13 
14 /**
15  * Hello world!
16  * @RestController = @Controller + @ResponseBody
17  * @SpringBootApplication = @Configration +  @EnableAutoConfiguration + @ComponentScan
18  * @ServletComponentScan scan servlet filter interceptor listener
19  */
20 @RestController
21 @SpringBootApplication
22 @ServletComponentScan
23 @EnableScheduling //定时任务
24 public class BootSpring
25 {
26     @RequestMapping("/{name}")
27     String home(@PathVariable String name){
28         return bootService.hello(name);
29     }
30 
31     @Autowired
32     private BootService bootService;
33 
34     public static void main( String[] args )
35     {
36         LocalTime localTime = new LocalTime();
37         System.out.println( "Hello World!" + localTime.toString());
38         localTime = localTime.plusHours(1);
39         System.out.println("Hello agin World!" + localTime.toString());
40         SpringApplication.run(BootSpring.class, args);
41 
42     }
43 }
     1 package org.windwant.spring;
 2 
 3 import java.util.concurrent.atomic.AtomicInteger;
 4 
 5 /**
 6  * BootMgr
 7  */
 8 public class BootMgr {
 9 
10     private static AtomicInteger times = new AtomicInteger();
11 
12     public static Integer increment(){
13         return times.incrementAndGet();
14     }
15 
16     public static Integer decrement(){
17         return times.decrementAndGet();
18     }
19 }

        项目地址：https://github.com/windwant/spring-boot-test

（文/WindWant）

本文来源：http://www.cnblogs.com/niejunlei/p/5980544.html


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