SpringMVC框架的参数匹配_#{username}怎么与参数匹配-优快云博客

1. 基本数据类型（int为例）

//Controller代码

@RequestMapping("/hello")

public String mytest(int id){

logger.info(id);

return "demo";

}

输入请求：http://localhost:8080/Web/test/hello?id=100

打印出：

100

2.包装类型数据（Integer为例）

//Controller代码

@RequestMapping("/hello")

public String mytest(Integer id){

logger.info(id);

return "demo";

}

输入请求：http://localhost:8080/Web/test/hello?id=100

打印出：

100

3.自定义对象

//定义一个model

public class User {

   public int getAge() {
       return age;
   }
   public void setAge(int age) {
       this.age = age;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   private int age;
   private String name;

}

3.1一个自定义对象

//Controller代码

@RequestMapping("/hello")

public String mytest(User user){

logger.info("name is "+user.getName());

logger.info("age is "+user.getAge());

return "demo";
}

输入请求：http://localhost:8080/Web/test/hello?age=15&name=zhangsan

打印出：name is zhangsan

age is 15

3.2自定义对象和基本数据类型一起

如果将自定义对象和基本数据类型的数据一起作为请求的参数，那么如下所示：

//Controller代码

@RequestMapping("/hello")

public String mytest(User user,int id){

logger.info("name is "+user.getName());

logger.info("age is "+user.getAge());

logger.info("id is "+id);

return "demo";
}

输入请求：http://localhost:8080/Web/test/hello?age=15&name=zhangsan&id=17

打印出：

name is zhangsan

age is 15

id is 17

3.3请求参数有重复的key

//Controller代码

@RequestMapping("/hello")
public String mytest(String name,User user,int age ){
       logger.info("String name is "+name);
       logger.info("name is "+user.getName());
       logger.info("age is "+user.getAge());
       logger.info("int age is "+age);
return "demo";
}

输入请求：http://localhost:8080/Web/test/hello?name=zhanger&age=15&name=zhangsan&age=17&name=zhangsi

打印出：

String name is zhanger,zhangsan,zhangsi

name is zhanger,zhangsan,zhangsi

age is 15

int age is 15

从这个例子中可以看出，在controller中有重名的参数时，均被自定义的对象获取，而且String类型的参数获取多个参数，int类型的对象只获取第一个参数

//Controller代码

   @RequestMapping("/hello")
public String mytest(int age,String name,User user1,User user2){
       logger.info("int age is "+age);
       logger.info("String name is "+name);
       logger.info("user1 name is "+user1.getName());
       logger.info("user1 age is "+user1.getAge());
       logger.info("user2 name is "+user2.getName());
       logger.info("user2 age is "+user2.getAge());
       logger.info(user1.equals(user2));
return "demo";
}

输入请求：http://localhost:8080/Web/test/hello?name=zhanger&age=15&name=zhangsan&age=17&name=zhangsi

打印出：

int age is 15

String name is zhanger,zhangsan,zhangsi

user1 name is zhanger,zhangsan,zhangsi

user1 age is 15

user2 name is zhanger,zhangsan,zhangsi

user2 age is 15

true

由这个例子可以看出，在controller中有多个自定义对象的时候，并不是按照对象中字段名出现的顺序来匹配第一个、第二个等对象的，而是作为一个对象处理，这些对象都是同一个对象。这个对象匹配的请求参数，String类型的请求参数是一个个加入到这个对象中的，int类型的对象是只匹配到重名的第一个请求参数。

4.对象嵌套

//定义model

public class Head {

   public int getLength() {
       return length;
   }
   public void setLength(int length) {
       this.length = length;
   }
   public String getEye() {
       return eye;
   }
   public void setEye(String eye) {
       this.eye = eye;
   }
   private int length;
   private String eye;

}

public class User {

   private int age;
   private String name;
   private Head head;

   public int getAge() {
       return age;
   }
   public void setAge(int age) {
       this.age = age;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public Head getHead() {
       return head;
   }
   public void setHead(Head head) {
       this.head = head;
   }

}

//Controller代码

   @RequestMapping("/hello")
public String mytest(User user){
       logger.info("name is "+user.getName());
       logger.info("age is "+user.getAge());
       logger.info("eye is "+user.getHead().getEye());
       logger.info("length is "+user.getHead().getLength());
return "demo";
}

输入请求：http://localhost:8080/Web/test/hello?name=zhanger&age=15&head.length=10&head.eye=big

打印出：

name is zhanger

age is 15

eye is big

length is 10

使用User实体对象中的head.length等作为请求的参数，从而可以完成对象嵌套的参数匹配

5.List形式对象的匹配

//定义model

public class User {

   private int age;
   private String name;

   public int getAge() {
       return age;
   }
   public void setAge(int age) {
       this.age = age;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }

}

public class UserList {

List<User> userList;

   public List<User> getUserList() {
       return userList;
   }

   public void setUserList(List<User> userList) {
       this.userList = userList;
   }

}

//Controller代码

   @RequestMapping("/hello")
public String mytest(UserList list){
       for(User user:list.userList) {
           logger.info("user name is "+user.getName()+",age is "+user.getAge());
       }
return "demo";
}

输入请求：

待续。。。。。。。