解耦
1.概述
解耦就是尽量降低代码的耦合度。
2.方式一
1 /** 2 * 解耦方式一: 3 * 通过ActionContext对象的getContext()获取Servlet对象 4 * @return 5 */ 6 public String api1(){ 7 //1、设置Session 8 //Session中的数据是以键值对的形式存在的 9 Map<String,Object> session = ActionContext.getContext().getSession(); 10 //将键值对存储到Map集合中 11 session.put("user", "Mike"); 12 session.put("age", 20); 13 //将Session添加到ActionContext中 14 ActionContext.getContext().setSession(session); 15 16 //2、Application 17 Map<String,Object> application = ActionContext.getContext().getApplication(); 18 //设置Application的值 19 application.put("count", "100"); 20 ActionContext.getContext().setApplication(application); 21 22 23 //3、获取parameter(URL地址中的请求参数) 24 //http://localhost:8080/03ServletAPI/api1.action?name=Mike&age=20&gender=true 25 Map<String,Object> parameters = ActionContext.getContext().getParameters(); 26 //获取Key的集合 27 Set<String> keys = parameters.keySet(); 28 //获取set的迭代器 29 Iterator<String> iterator = keys.iterator(); 30 //遍历迭代器 31 while(iterator.hasNext()){ 32 //获取key的值 33 String key = iterator.next(); 34 System.out.println(key + " = " + parameters.get(key)); 35 } 36 37 //4、request 38 Map<String,Object> request = (Map<String,Object>)ActionContext.getContext().get("request"); 39 40 return "success"; 41 }
3.方式二(推荐使用)
1 /** 2 * 解耦方式二: 3 * StrutsStatics中定义了常用对象的字符串(字符串内容是类的完整名称) 4 * @return 5 * @throws IOException 6 */ 7 public String api2() throws IOException{ 8 //1、获取Request对象 9 HttpServletRequest req = (HttpServletRequest)ActionContext.getContext().get(StrutsStatics.HTTP_REQUEST); 10 11 //通过Request对象获取Session对象 12 HttpSession session = req.getSession(); 13 14 //通过Request对象获取application对象 15 ServletContext application = req.getServletContext(); 16 17 //通过Reqeust对象获取请求参数 18 String name = req.getParameter("name"); 19 20 21 //2、获取Response对象 22 HttpServletResponse resp = (HttpServletResponse)ActionContext.getContext().get(StrutsStatics.HTTP_RESPONSE); 23 resp.getWriter().print("abvc"); 24 25 return "success"; 26 }
每接触一个新领域,我就像一块掉进水里的海绵,四面八方的养分都让我不断充实。O(∩_∩)O~