簡單的Spring MVC 程序

package group.esperanto.action;

import java.io.IOException;

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

import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

@Controller
// 定義該Action的映射路徑
// 該路徑絕對不能重複
@RequestMapping("/pages/emp/*")
public class EmpAction {	
	private	Logger log = Logger.getLogger(EmpAction.class);
	
	@RequestMapping("echo")  //映射方法名
   public void echo(String msg){
	   Logger.getLogger(EmpAction.class).info(msg);
   }
	@RequestMapping("list")
   public ModelAndView list(    // 設置參數親求名和 默認值
			   @RequestParam(value="cp",defaultValue="1") int currentPage,
			   @RequestParam(value="lc",defaultValue="10") int lineSize,
			   @RequestParam(value="col",defaultValue="title") String column,
			   @RequestParam(value="kw",defaultValue="") String keyWord){
		     log.info("--- currentPage : "+currentPage+" ---");
		     log.info("--- lineSize : "+lineSize+" ---");
		     log.info("--- column : "+column+" ---");
		     log.info("--- keyWord : "+keyWord+" ---");		
		     return null;
	 }
	@RequestMapping("get")    // 接收Servlet內置對象 request,response
   public ModelAndView get(int id,HttpServletRequest request,HttpServletResponse response){
	   HttpSession session = request.getSession();
	   ServletContext application = request.getServletContext();
	   log.info("--- contextPath :" + request.getServletPath());
	   log.info("--- sessionId :" + session.getId());
	   log.info("--- realPath :" + application.getRealPath("/"));
	   try {
		    response.getWriter().println("Hello Spring MVC");
	    } catch (IOException e) {
		    e.printStackTrace();
	    }
	   return null;
   }	
}