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JAVA-Spring-WebSite-for-Eclipse2

JAVA-Spring WebSite for Eclipse for JavaConfig 設定

Web <-> Server

  • 設定 WebInitializer.java

    • 設定 DispatcherServlet

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      @Configuration
      public class WebAppInitializer implements WebApplicationInitializer{

          @Override
          public void onStartup(ServletContext servletContext) throws ServletException{
              System.out.println("MVC WebAppInitializer StartUp!");
              AnnotationConfigWebApplicationContext appContext = new AnnotationConfigWebApplicationContext();
              appContext.register(WebMvcConfig.class);
              
              ServletRegistration.Dynamic dispather =servletContext.addServlet(
                      "SpringDispatcher", new DispatcherServlet(appContext));
              dispather.setLoadOnStartup(1);
              dispather.addMapping("/");
              
          }
          
      }

  • 設定 WebConfig

    • 加上 annotation

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      @Configuration
      @EnableWebMvc
      @ComponentScan("com.test ")//設定要掃描的 Component package
      public class WebMvcConfig extends WebMvcConfigurerAdapter{

    • 設定將要載入的bean

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      //設定從 Controller 返回 String or ModelAndView 提取 view 的解析器
      @Bean(name = "viewResolver")
      public InternalResourceViewResolver getViewResolver() {
          InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
          viewResolver.setPrefix("/WEB-INF/views/");
          viewResolver.setSuffix(".jsp");
          return viewResolver;
      }

    • 有需要接收 json 格式 ，需加載mappingJackson2HttpMessageConverter，否則會出現 ERROR:Completed 415 UNSUPPORTED_MEDIA_TYPE

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      @Bean
      public RequestMappingHandlerAdapter getRequestMappingHandlerAdapter(
              @Autowired MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter,
              @Autowired ContentNegotiationManager mvcContentNegotiationManager) {
          RequestMappingHandlerAdapter requestMappingHandlerAdapter = new RequestMappingHandlerAdapter();
          requestMappingHandlerAdapter
                  .setMessageConverters(Collections.singletonList(mappingJackson2HttpMessageConverter));
          requestMappingHandlerAdapter.setContentNegotiationManager(mvcContentNegotiationManager);
          return requestMappingHandlerAdapter;
      }

      @Bean
      public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
          return new MappingJackson2HttpMessageConverter();
      }

  • 設定 Controller

    • 建立 Controller.java

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      @Controller
      public class Controller {

    • 針對 url 設定 RequestMapping

      • 由頁面初始化時觸發

      • 前端接資料由 jsp 方式去接

      • 回傳 string，代表指定頁面

      • 需要帶值傳遞，回傳 ModelAndView class

      • 有參數要帶入加上 @RequestParam annotation

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        @RequestMapping("/edit")
        public ModelAndView editCustomerForm(@RequestParam Long id) {
            System.out.println("action edit");
            Customer customer = customerService.get(id);
            ModelAndView mv = new ModelAndView("edit_customer");
            mv.addObject("customer", customer);
            return mv;
        }

    • 以 api 方式呼叫，設定

      • RequestMapping需帶入

        • value : api url
        • method : 回傳方式 POST or GET

      • 回傳自定格式需加上 @ResponseBody annotation

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        @RequestMapping(value = "/hello.action",method = RequestMethod.POST)
        @ResponseBody
        public User jsontest(@RequestBody UseInfo use) {
            System.out.println("received jsontest");
            
            Date dNow = new Date( );
            SimpleDateFormat ft = new SimpleDateFormat ("yyyy-MM-dd hh:mm:ss");
            User u= new User(use.getName() ,ft.format(dNow) ,use.getPrice());
            return u;
            
        }

  • 要讓 Tomcat Server在啟動時，自動的讀取 WebInitializer

    • 設定 SpringServletContainerInitializer.java

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      //設定 onStartup要啟動的 class
      @HandlesTypes({WebApplicationInitializer.class})
      public class SpringServletContainerInitializer implements ServletContainerInitializer{
          public  SpringServletContainerInitializer() {
              
          }
          
          @Override
          public void onStartup(@Nullable Set<Class<?>> webApplicationInitializerClasss, javax.servlet.ServletContext servletContext) throws javax.servlet.ServletException{
              System.out.println("MVC StartUp!");


          
          }

      }

    • 建立 javax.servlet.ServletContainerInitializer

      • 在專案按右鍵 > Build Path > Configure Build Path

      • 選擇 Source

      • 在 src底下建立 /resources/META-INF/services/ 資料夾

      • 新增檔案 javax.servlet.ServletContainerInitializer(無附檔名)

        • 加入內容

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          com.test.config.SpringServletContainerInitializer

    • 不建立 javax.servlet.ServletContainerInitializer 會無法啟動 SpringServletContainerInitializer