SpringMVC学习(5): RequestParam 注解
2017-04-22 22:35
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之前讲过PathVariable可以通过占位符来获取url中的参数,实际上我们还可以用使用@RequestParam绑定请求参数
@RequestParam的属性有:
value:参数名字
required:表示URL是不是必须有这个参数
defaultValue:当URL中没有这个参数时给一个缺省值
在之前的基础上写一个简单的例子,在java文件中:
package springmvc;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
@Controller
@RequestMapping("/springmvc")
public class HelloWorld {
private static final String SUCCESS = "success";
@RequestMapping(value="/testRequestParam")
public String testRequestParam(@RequestParam(value="username") String username,
@RequestParam(value="age", required=false, defaultValue="0") int age) {
System.out.println("Test RequestParam, username: " + username + ", age: " + age);
return SUCCESS;
}
}
在index.jsp文件中:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>SpringMVC</title>
</head>
<body>
<a href="springmvc/testRequestParam?username=atguigu">Test RequestParam</a>
</body>
</html>运行起来可以看到效果:
此外,还有@RequestHeader是用来映射请求头的用法与@RequestValue类似
@CookieValue是用来映射Cookie的,这些用法都是差不多的。
@RequestParam的属性有:
value:参数名字
required:表示URL是不是必须有这个参数
defaultValue:当URL中没有这个参数时给一个缺省值
在之前的基础上写一个简单的例子,在java文件中:
package springmvc;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
@Controller
@RequestMapping("/springmvc")
public class HelloWorld {
private static final String SUCCESS = "success";
@RequestMapping(value="/testRequestParam")
public String testRequestParam(@RequestParam(value="username") String username,
@RequestParam(value="age", required=false, defaultValue="0") int age) {
System.out.println("Test RequestParam, username: " + username + ", age: " + age);
return SUCCESS;
}
}
在index.jsp文件中:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>SpringMVC</title>
</head>
<body>
<a href="springmvc/testRequestParam?username=atguigu">Test RequestParam</a>
</body>
</html>运行起来可以看到效果:
此外,还有@RequestHeader是用来映射请求头的用法与@RequestValue类似
@CookieValue是用来映射Cookie的,这些用法都是差不多的。
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