SpringMVC_获取参数之RequestParam绑定请求参数

一、拥有属性：

value
required
defaultValue

二、value默认值，requared默认为true

参数值可以为空

StudentController.java

@Controller
@RequestMapping("/student")
public class StudentController {
    @RequestMapping("/testRequestParam")
    public String testRequestParam(String name,Integer age){
        System.out.println(name);
        System.out.println(age);
        return "success";
    }
}

webapp/requestparam_input.jsp

<%--
  Created by IntelliJ IDEA.
  User: sunny
  Date: 2018/8/13
  Time: 10:31
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <form action="${pageContext.request.contextPath}/student/testRequestParam">
        姓名：<input type="text" name="name"/>
        年龄：<input type="text" name="age"/>
        <input type="submit" value="提交" />
    </form>
</body>
</html>

测试
- 在/WEB-INF/views下新建success.jsp
- 然后访问http://localhost:8080/springmvc_demo/requestparam_input.jsp 填值后提交即可跳转到 /WEB-INF/views/success.jsp页面

三、value指定，requared默认为true

参数值可以为空

StudentController.java

@Controller
@RequestMapping("/student")
public class StudentController {
    @RequestMapping("/testRequestParam")
    public String testRequestParam(@RequestParam("name") String name1,
                                   @RequestParam("age") Integer age1){
        System.out.println(name);
        System.out.println(age);
        return "success";
    }
}

webapp/requestparam_input.jsp

<%--
  Created by IntelliJ IDEA.
  User: sunny
  Date: 2018/8/13
  Time: 10:31
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <form action="${pageContext.request.contextPath}/student/testRequestParam">
        姓名：<input type="text" name="name"/>
        年龄：<input type="text" name="age"/>
        <input type="submit" value="提交" />
    </form>
</body>
</html>

测试
- 在/WEB-INF/views下新建success.jsp
- 然后访问http://localhost:8080/springmvc_demo/requestparam_input.jsp 填值后提交即可跳转到 /WEB-INF/views/success.jsp页面

四、value指定、requared=false（封装类）

参数值可以为空

StudentController.java

@Controller
@RequestMapping("/student")
public class StudentController {
    @RequestMapping("/testRequestParam")
    public String testRequestParam(@RequestParam(value = "name",required = false) String name1,
                                    @RequestParam(value = "age",required = false) Integer age1){
        System.out.println(name1);
        System.out.println(age1);
        return "success";
    }
}

webapp/requestparam_input.jsp

<%--
  Created by IntelliJ IDEA.
  User: sunny
  Date: 2018/8/13
  Time: 10:31
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <form action="${pageContext.request.contextPath}/student/testRequestParam">
        姓名：<input type="text" name="name"/>
        年龄：<input type="text" name="age"/>
        <input type="submit" value="提交" />
    </form>
</body>
</html>

测试
- 在/WEB-INF/views下新建success.jsp
- 然后访问http://localhost:8080/springmvc_demo/requestparam_input.jsp 填值后提交即可跳转到 /WEB-INF/views/success.jsp页面

五、value指定、requared=false（原生数据类型）

这样写，参数值必须，不然的话就报错。如果参数值不是必须，则此写法不支持基本变量。

StudentController.java

@Controller
@RequestMapping("/student")
public class StudentController {
    @RequestMapping("/testRequestParam")
    public String testRequestParam(@RequestParam(value = "name",required = false) String name1,
                                    @RequestParam(value = "age",required = false) int age1){
                                    //age不能为空，必填
        System.out.println(name1);
        System.out.println(age1);
        return "success";
    }
}

webapp/requestparam_input.jsp

<%--
  Created by IntelliJ IDEA.
  User: sunny
  Date: 2018/8/13
  Time: 10:31
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <form action="${pageContext.request.contextPath}/student/testRequestParam">
        姓名：<input type="text" name="name"/>
        年龄：<input type="text" name="age"/>
        <input type="submit" value="提交" />
    </form>
</body>
</html>

测试
- 在/WEB-INF/views下新建success.jsp
- 然后访问http://localhost:8080/springmvc_demo/requestparam_input.jsp 填值后提交即可跳转到 /WEB-INF/views/success.jsp页面

六、有默认值（defaultValue）

参数给默认值：此时不需要再写required=false

StudentController.java

@Controller
@RequestMapping("/student")
public class StudentController {
    //required = false、Integer age1
    @RequestMapping("/testRequestParam1")
    public String testRequestParam1(@RequestParam("name") String name1,
                                    @RequestParam(value = "age",required = false,
                                    defaultValue = "20") Integer age1){
        System.out.println(name1);
        System.out.println(age1);
        return "success";
    }
    
    //Integer age1
    @RequestMapping("/testRequestParam2")
    public String testRequestParam2(@RequestParam("name") String name1,
                                    @RequestParam(value = "age",
                                    defaultValue = "20") Integer age1){
        System.out.println(name1);
        System.out.println(age1);
        return "success";
    }
    
    //int age1
    @RequestMapping("/testRequestParam3")
    public String testRequestParam3(@RequestParam("name") String name1,
                                    @RequestParam(value = "age",
                                    defaultValue = "20") int age1){
        System.out.println(name1);
        System.out.println(age1);
        return "success";
    }
}

webapp/requestparam_input.jsp

<%--
  Created by IntelliJ IDEA.
  User: sunny
  Date: 2018/8/13
  Time: 10:31
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <%--<form action="${pageContext.request.contextPath}/student/testRequestParam1">--%>
    <%--<form action="${pageContext.request.contextPath}/student/testRequestParam2">--%>
    <form action="${pageContext.request.contextPath}/student/testRequestParam3">
        姓名：<input type="text" name="name"/>
        年龄：<input type="text" name="age"/>
        <input type="submit" value="提交" />
    </form>
</body>
</html>

测试
- 在/WEB-INF/views下新建success.jsp
- 然后访问http://localhost:8080/springmvc_demo/requestparam_input.jsp 填值后提交即可跳转到 /WEB-INF/views/success.jsp页面

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SpringMVC_获取参数之RequestParam绑定请求参数.md

SpringMVC_获取参数之RequestParam绑定请求参数.md

SpringMVC_获取参数之RequestParam绑定请求参数

一、拥有属性：

二、value默认值，requared默认为true

三、value指定，requared默认为true

四、value指定、requared=false（封装类）

五、value指定、requared=false（原生数据类型）

六、有默认值（defaultValue）

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SpringMVC_获取参数之RequestParam绑定请求参数

一、拥有属性：

二、value默认值，requared默认为true

三、value指定，requared默认为true

四、value指定、requared=false（封装类）

五、value指定、requared=false（原生数据类型）

六、有默认值（defaultValue）