一个mvc小案例

 

Add
	





       
  		CustomerServlet
  		zzuli.mvcapp.servlet.CustomerServlet
  	
  	
  		CustomerServlet
  		/customerServlet
  	



       protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String method = request.getParameter("method");
		
		switch(method) {
			case "add" : add(request,response);break;
			case "query" : query(request,response);break;
			case "delete" : delete(request,response);break;
		}
	}

 

利用反射实现多个请求访问一个Servlet

      Add
	



	Delete
	




     映射为*.do,
  	
  		CustomerServlet
  		zzuli.mvcapp.servlet.CustomerServlet
  	
  	
  		CustomerServlet
  		*.do
  	



	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//获取servletPath:/add.do
		String servletPath = request.getServletPath();
		String methodName = servletPath.substring(1);
		//得到方法名,去掉:/ .do
		methodName = methodName.substring(0, methodName.length() - 3);
		
		try {
			//利用反射获取method对应的方法
			Method method = getClass().getDeclaredMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
			//利用反射调用对应的方法
			method.invoke(this, request, response);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

拼SQL语句

     @Override
	public List getForListWithCriteriaCustomer(CriteriaCustomer cc) {
		String sql = "SELECT * FROM customer WHERE name LIKE ? AND address LIKE ? "
				+"AND phone LIKE ?";
           //在CriteriaCustomer里边封装了geter,seter方法,得到"%%","%name"
		return getForList(sql, cc.getName(), cc.getAddress(), cc.getPhone());
	}

    public String getAddress() {
		if(address == null)
			address = "%%";
		else
			address = "%" + address + "%";
		return address;
	}