request获取请求数据的方法
1.获取所有参数map集合
1 map<String,String [] >getParameterMap()
2.根据名称获取参数值（数组）
1 String[] fetParameterValues(String name)
3.根据名称获取参数值（单个值）
1 String getParameter(String name)
案例：
1 //1. 获取所有参数的Map集合 2 Map<String, String[]> map = req.getParameterMap(); 3 for (String key : map.keySet()) { 4 // username:zhangsan lisi 5 System.out.print(key+":"); 6 7 //获取值 8 String[] values = map.get(key); 9 for (String value : values) { 10 System.out.print(value + " "); 11 } 12 13 System.out.println(); 14 }
1 String[] hobbies = req.getParameterValues("hobby"); 2 for (String hobby : hobbies) { 3 System.out.println(hobby); 4 }
1 String username = req.getParameter("username"); 2 String password = req.getParameter("password"); 3 System.out.println(username); 4 System.out.println(password)
