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SpringMVC接收checkbox传值

Controller方法形参接收checkbox的值，既可以用String，也可以用String[]。

字符串数组接收的测试代码如下：

@Controller
@RequestMapping("/mycontroller")
public class MyController {

    @RequestMapping(method = RequestMethod.GET)
    public String form() {
        return "mycontroller";
    }

    @RequestMapping(method = RequestMethod.POST)
    public String form1(@RequestParam("interest") String[] interest, Model model) {
        String a = Arrays.toString(interest);
        model.addAttribute("ins", a);
return "ok";
    }

}

测试页面如下：

/WEB-INF/jsp/mycontroller.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>请选择</title>
</head>
<body>
    <form action="${pageContext.request.contextPath }/mycontroller.action"
        method="post">
        <input type="checkbox" name="interest" value="a1" />a1<br />
        <input type="checkbox" name="interest" value="a2" />a2<br />
        <input type="checkbox" name="interest" value="a3" />a3<br />
        <input type="checkbox" name="interest" value="a4" />a4<br />
        <input type="checkbox" name="interest" value="a5" />a5<br />
        
        <input type="submit"/>
    </form>
</body>

</html>

结果显示页面如下：

/WEB-INF/jsp/ok.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>操作成功</title>
</head>
<body>
    
    选择的内容是：${ins}<br/>
</body>

</html>

结果：

字符串接收的测试代码如下（测试完数组接收后修改即可）：

@Controller
@RequestMapping("/mycontroller")
public class MyController {

    @RequestMapping(method = RequestMethod.GET)
    public String form() {
        return "mycontroller";
    }

    @RequestMapping(method = RequestMethod.POST)
    public String form1(@RequestParam("interest") String interest, Model model) {
        model.addAttribute("ins", interest);
        
        return "ok";
    }

}

结果是：

小知识：

　　如果checkbox都留空（不选择），那么Controller会报错。解决办法：①前端js判断；②前端加一个hidden的checkbox。

补充方法：

@RequestParam(value = "interest", required = false)

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原文地址：https://www.cnblogs.com/larryzeal/p/5474239.html