Java程式教學甘仔店: 建立一個SpringMVC Annotation Project 2-1 (判斷Mobile Tablet Desktop)

2014年12月7日星期日

建立一個SpringMVC Annotation Project 2-1 (判斷Mobile Tablet Desktop) - Hello World

本文使用 Spring Web model-view-controller (MVC) framework
建立一個簡單的一個Hello World 程式且可判斷Mobile Tablet Desktop進入這頁面
有三種方式：
　方式一：設備檢測
設備檢測是分析HTTP请求以决定發出请求的設備的過程。
這通常是通過檢測User-Agent Header和其他请求来實現作的。

1、請參考建立一個SpringMVC Annotation Project - Hello World此篇文章，以下是以此作為延伸

2、加入 spring-mobile-device.jar
加入在Maven專案中的pom.xml

<dependency>
<groupId>org.springframework.mobile</groupId>
<artifactId>spring-mobile-device</artifactId>
<version>1.1.3.RELEASE</version>
</dependency>

3. 更改Controller 部分

package com.sample.web.controller;

import org.springframework.mobile.device.Device;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class HelloController {

 @RequestMapping(value = { "/", "/welcome**" }, method = RequestMethod.GET)
 public ModelAndView welcomePage(Device device) {

  ModelAndView model = new ModelAndView();
  if( device.isMobile() ){
   model.addObject("message", "Hello World Mobile User!");
  }else if( device.isTablet() ){
   model.addObject("message", "Hello World Tablet User!");
  }else if( device.isNormal() ){
   model.addObject("message", "Hello World Desktop User!");
  }
  model.setViewName("hello");
  return model;

 }

}

4. 更改AppConfig 部分(Spring 設定) - 需繼承 WebMvcConfigurerAdapter
目錄 : src/main/java/com/sample/config
檔名 : AppConfig.java

程式碼：

package com.sample.config;

import java.util.List;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.mobile.device.DeviceHandlerMethodArgumentResolver;
import org.springframework.mobile.device.DeviceResolverHandlerInterceptor;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;


@EnableWebMvc
@Configuration
@ComponentScan({ "com.sample.web.*" })
public class AppConfig extends WebMvcConfigurerAdapter{
 
 /**
  * 設備攔截器
  * @return DeviceResolverHandlerInterceptor
  */
 @Bean
 public DeviceResolverHandlerInterceptor deviceResolverHandlerInterceptor() {
     return new DeviceResolverHandlerInterceptor();
 }

 /**
  * 設備處理程序
  * @return DeviceHandlerMethodArgumentResolver
  */
 @Bean
 public DeviceHandlerMethodArgumentResolver deviceHandlerMethodArgumentResolver() {
     return new DeviceHandlerMethodArgumentResolver();
 }

 /**
  * 加入SPRING攔截器
  */
 @Override
 public void addInterceptors(InterceptorRegistry registry) {
     registry.addInterceptor(deviceResolverHandlerInterceptor());
 }

 /**
  * 加入參數解析器
  */
 @Override
 public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
     argumentResolvers.add(deviceHandlerMethodArgumentResolver());
 }

 @Bean
 public InternalResourceViewResolver viewResolver() {
     InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
     viewResolver.setViewClass(JstlView.class);
     viewResolver.setPrefix("/WEB-INF/pages/");
     viewResolver.setSuffix(".jsp");
     return viewResolver;
 }
 
}

5.建立 SpringMvcInitializer.java(增加CharacterEncodingFilter)
目錄 : src/main/java/com/sample/config/core
檔名 : SpringMvcInitializer.java(以下兩張圖片web.xml和Annotation寫法比對)

程式碼：

package com.sample.config.core;

import javax.servlet.Filter;

import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

import com.sample.config.AppConfig;

public class SpringMvcInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

 @Override
 protected Class[] getRootConfigClasses() {
  return new Class[] { AppConfig.class };
 }

 @Override
 protected Class[] getServletConfigClasses() {
  return null;
 }

 @Override
 protected String[] getServletMappings() {
  return new String[] { "/" };
 }
 
 @Override
        protected Filter[] getServletFilters() {
            CharacterEncodingFilter utf8Filter = new CharacterEncodingFilter();
            utf8Filter.setEncoding("UTF-8");
            utf8Filter.setForceEncoding(true);
            return new Filter[] { utf8Filter };
        }
 
}