1, the binding request parameters described
1. binding mechanism: SpringMVC parameter binding process parameter request to the submitted form, a method as a parameter controller bundling
Submit the same name attribute parameters of the form and method of the controller: 2. requirements.
2, supported data types
1. The basic data types and string types
2.JavaBean
3. The aggregate data type
Example 1: Binding Type String
From the front end of the form "username" and "password" parameter controller in accordance with the method name!
1 //---------------前端------------------ 2 <form action="user/login" method="get"> 3 用户名： <input type="txt" name="username"> 4 密 码： <input type="txt" name="password"> 5 <input type="submit" value="提交"> 6 </form> 7 8 //---------------控制器------------------ 9 public String login(String username,String password){ 10 System.out.println( 11 "用户名:"+username+" 密码:"+password 12 ); 13 return "success"; 14 }
Example 2, binding type JavaBean
Requirements: the attribute of the name of the bean from the front end of the object name form the value controller!
1 //---------------javaBean------------------ 2 public class user { 3 private String name; 4 private String password; 5 } 6 7 //---------------前端------------------ 8 <form action="user/login" method="get"> 9 用户名： <input type="txt" name="name"> 10 密 码： <input type="txt" name="password"> 11 <input type="submit" value="提交"> 12 </form> 15--------------- controller ------------------//1413 is public String login(user newuser){ 16 System.out.println( 17 "用户名:"+username+" 密码:"+password 18 ); 19 return "success"; 20 }
Example 3, the type of binding JavaBean (other references exist in the JavaBean JavaBean)
name value in the front end requires a reference to the object name. attribute bound form.
1 //---------------javaBean（存在对user的引用）------------------ 2 public class Account { 3 private String name; 4 private String money; 5 private user newuser; 6 } 7 //---------------前端------------------ 8 <form action="user/adduser" method="post" > 9 账户名称： <input type="text" name="name"><br> 10 账户金额： <input type="text" name="money"><br> 11 用户名:<input type="text" name="newuser.name"><br> 12 用户密码:<input type="text" name="newuser.password"><br> 13 <input type="submit" value="提交"> 14 </form> 15 //---------------控制器------------------ 16 @RequestMapping("/adduser") 17 public String adduser(Account account){ 18 19 System.out.println(account); 20 return "success"; 21 } 22
Example 4, set binding type (List and Map)
. 1 // --------------- ------------------ the JavaBean 2 public class the Account { . 3 Private String name; . 4 Private String Money; . 5 Private List <User> List; // To demonstrate binding collection type . 6 Private the Map <String, User> Map; // To demonstrate binding collection type 7 } 8 // ----------- ---- ------------------ front end 9 <% - binding test collection type -%> 10 <form Action = "User / the adduser" Method = " POST "> 11 account name: <the INPUT of the type =" text "name =" name "> <br> 12The amount of accounts: <the INPUT of the type = "text" name = "Money"> <br> 13 <% - to bind to a List collection -%> 14 Nickname: <input type = "text" name = "list [0] .name "> <br> 15 user password: <INPUT type =" text "name =" List [0] .password "> <br> 16 <% - set to bind to the Map -% > 17 nickname: <INPUT type = "text" name = "Map [ 'One'] name."> <br> 18 is the user password: <input type = "text" name = "map [ 'one'] password. "> <br> 19 <= the INPUT of the type" the submit "value =" submit "> 20 </ form> 21 22 //---------------控制器------------------ 23 @RequestMapping("/adduser") 24 public String adduser(Account account){ 25 26 System.out.println(account); 27 return "success"; 28 }