PageController.java

package org.springboot.sample.controller;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.EnvironmentAware;
import org.springframework.core.env.Environment;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;

@Controller
public class PageController implements EnvironmentAware{
	
	private static final Logger log = LoggerFactory.getLogger(PageController.class);
	
	// 从 application.properties 中读取配置，如取不到默认值为Hello Shanhy
	@Value("${application.hell:Hello Shanhy}")
	private String hello = "Hello Shanhy";

	/**
	 * 默认页<br/>
	 * @RequestMapping("/") 和 @RequestMapping 是有区别的
	 * 如果不写参数，则为全局默认页，加入输入404页面，也会自动访问到这个页面。
	 * 如果加了参数“/”，则只认为是根页面。
	 *
	 * @return
	 * @author SHANHY
	 * @create  2016年1月5日
	 */
	@RequestMapping(value = {"/","/index"})
	public String index(Map<String, Object> model){
		// 直接返回字符串，框架默认会去 spring.view.prefix 目录下的 （index拼接spring.view.suffix）页面
		// 本例为 /WEB-INF/jsp/index.jsp
		model.put("time", new Date());
		model.put("message", this.hello);
		
		return "index";
	}
	
	/**
	 * 响应到JSP页面page1
	 *
	 * @return
	 * @author SHANHY
	 * @create  2016年1月5日
	 */
	@RequestMapping("/page1")
	public ModelAndView page1(){
		log.info(">>>>>>>> PageController.page1");
		// 页面位置 /WEB-INF/jsp/page/page.jsp
		ModelAndView mav = new ModelAndView("page/page1");
		mav.addObject("content", hello);
		return mav;
	}
	
	/**
	 * 响应到JSP页面comet
	 *
	 * @return
	 * @author SHANHY
	 */
	@RequestMapping("/comet")
	public ModelAndView comet(){
		ModelAndView mav = new ModelAndView("comet");
		return mav;
	}
	
	@RequestMapping("/async/test")
	@ResponseBody
    public Callable<String> callable() {
		// 这么做的好处避免web server的连接池被长期占用而引起性能问题，
		// 调用后生成一个非web的服务线程来处理，增加web服务器的吞吐量。
        return new Callable<String>() {
            @Override
            public String call() throws Exception {
                Thread.sleep(3 * 1000L);
                return "小单 - " + System.currentTimeMillis();
            }
        };
    }

	@RequestMapping("/testJson")
	@ResponseBody
	public Map<String, String> getInfo(@RequestParam(required=false) String name,
			@RequestParam(required=false) String name1) {
		Map<String, String> map = new HashMap<>();
		map.put("name", name);
		map.put("name1", name1);
		return map;
	}
	
	/**
	 * 输入 和输出为JSON格式的数据的方式 HttpEntity<?> ResponseEntity<?>
	 * 
	 * @param u
	 * @return
	 */
	@ResponseBody
	@RequestMapping(value = "/testJson2", method = RequestMethod.GET)
	public ResponseEntity<Map<String, String>> jsonTest4(@RequestParam(required=false) String name,
			@RequestParam(required=false) String name1, HttpServletRequest request, HttpServletResponse response) {
		
		Map<String, String> map = new HashMap<>();
		map.put("name", name);
		map.put("name1", name1);
		
		// 这里直接new一个对象（HttpHeaders headers = new HttpHeaders();）
		HttpHeaders responseHeaders = new HttpHeaders();
		responseHeaders.add("MyHeaderName", "SHANHY");
		
		List<String> domainList = new ArrayList<>();
		domainList.add("http://www.domain1.com");
		domainList.add("http://www.domain2.com");
		domainList.add("http://localhost:8088");
		String requestDomain = request.getHeader("origin");
		log.info("requestDomain = " + requestDomain);
		if(domainList.contains(requestDomain)){
			response.addHeader("Access-Control-Allow-Origin", requestDomain);
			response.addHeader("Access-Control-Allow-Methods", "GET");
			response.addHeader("Access-Control-Allow-Headers", "x-requested-with,content-type");
		}
		
		ResponseEntity<Map<String, String>> responseResult = new ResponseEntity<Map<String, String>>(
				map, responseHeaders, HttpStatus.OK);
		return responseResult;
	}
	
	/**
	 * 响应到JSP页面page1（可以直接使用Model封装内容，直接返回页面字符串）
	 *
	 * @return
	 * @author SHANHY
	 * @create  2016年1月5日
	 */
	@RequestMapping("/page2")
	public String page2(Model model){
		// 页面位置 /WEB-INF/jsp/page/page.jsp
		model.addAttribute("content", hello + "（第二种）");

		// 下面是测试EhCache的
		String cacheContent = "";
		CacheManager cacheManager = CacheManager.getInstance();
		Cache cache = cacheManager.getCache("testCache");
		Element element = cache.get("key");
		if(element == null){
			element = new Element("key", "你好，缓存内容！" + System.currentTimeMillis());
			cache.put(element);
		}
		cacheContent = element.getValue().toString();
		model.addAttribute("content", hello + "（第二种）" + cacheContent);
		
		return "page/page1";
	}

	@Override
	public void setEnvironment(Environment environment) {
		String s = environment.getProperty("JAVA_HOME");
		System.out.println(s);
	}
}