spring mvc @ PathVariable Bind URI Template Variable Values
- 2021-12-09 08:41:53
- OfStack
Directory @ PathVariable binds URI template variable values @ RequestParam (parameter bound to controller) and @ PathVariable (parameter bound to url template variable)
@ PathVariable Bind URI Template Variable Values
@ PathVariable is used to map the template variables in the request URL to the parameters of the function processing method.
@RequestMapping(value="/users/{userId}/topics/{topicId}")
public String test(
@PathVariable(value="userId") int userId,
@PathVariable(value="topicId") int topicId)
If the requested URL is "Controller URL/users/123/topics/456", the template variables {userId} and {topicId} in URL are automatically bound to the parameters with the same name annotated by @ PathVariable, that is, userId=123 and topicId=456 after entering the parameters.
The code is in PathVariableTypeController.
@ RequestParam (parameter bound to controller) and @ PathVariable (parameter bound to url template variable)
spring mvc: Exercises @ RequestParam and @ PathVariable
@RequestParam
Annotations bind request parameters to your controller method parameters
@PathVariable
Annotation binds 1 method parameter to the value of 1 URI template variable
@ RequestParam: Annotation binds request parameters to your controller method parameters
@RequestMapping(value="/example/user")
public String UserInfo(Model model, @RequestParam(value="name", defaultValue="Guest") String name)
Example:
package springmvc;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
@Controller
public class RequestParamExampleController {
@RequestMapping(value="/example/user")
public String UserInfo(Model model,
@RequestParam(value="name", defaultValue="Guest") String name)
{
model.addAttribute("name", name);
if("admin".equals(name))
{
model.addAttribute("email", "admin@google.com");
}else {
model.addAttribute("email", "not set");
}
return "example_user";
}
}
@ PathVariable: Annotation binds 1 method parameter to the value of 1 URI template variable
@RequestMapping(value="/example/info/{language}/{id}/{name}")
public String userInfo2(Model model,
@PathVariable(value="language") String language,
@PathVariable(value="id") Long id,
@PathVariable(value="name") String name)
Example:
package springmvc;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.PathVariable;
@Controller
public class RequestParamExampleController {
@RequestMapping(value="/example/person/{name}/{age}")
public String userPerson(Model model,
@PathVariable(value="name") String name,
@PathVariable(value="age") Long age)
{
model.addAttribute("name", name);
model.addAttribute("age", age);
String desc = "";
if(age > 20)
{
desc = "oldman";
}else {
desc = "yongman";
}
model.addAttribute("desc", desc);
return "example_person";
}
}