spring mvc:练习 @RequestParam(参数绑定到控制器)和@PathVariable(参数绑定到url模板变量)

spring mvc:练习 @RequestParam和@PathVariable

@RequestParam: 注解将请求参数绑定到你的控制器方法参数

@PathVariable: 注释将一个方法参数绑定到一个URI模板变量的值

@RequestParam: 注解将请求参数绑定到你的控制器方法参数

@RequestMapping(value="/example/user")
public String UserInfo(Model model,	@RequestParam(value="name", defaultValue="Guest") String name)

　　

实例：

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: 注释将一个方法参数绑定到一个URI模板变量的值

@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)

　　

实例：

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";
	}

}