Html 非常简单的spring MVC按钮点击
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Very simple spring MVC button click
提问by user101010101
I have the following code in my SampleController;
我的 SampleController 中有以下代码；
@Controller
public class SampleController {
@RequestMapping("home")
public String loadHomePage(Model m) {
m.addAttribute("name", "CodeTutr");
return "home";
}
@RequestMapping(value="/test", method=RequestMethod.GET)
public String handlePost(@RequestParam String action, Model m) {
if( action.equals("save") ){
//handle save
}
else if( action.equals("renew") ){
//handle renew
}
m.addAttribute("name", "change");
return "home";
}
}
on page load the attribute I set it successful shown on the web page. I am trying to get my head around button clicks on spring mvc below is my jsp code;
在页面加载属性我设置它成功显示在网页上。我试图让我的头脑围绕 spring mvc 上的按钮点击，下面是我的 jsp 代码；
<!DOCTYPE HTML>
<html>
<head>
<title>Sample Application</title>
</head>
<body>
<h1>Hello, ${name}!</h1>
<input type="submit" name="action" value="save" />
</body>
</html>
My input does not do anything, the method handlePost is never hit. I was trying to change the attribute "name" to the word "change", I am not sure what I am doing incorrectly.
我的输入没有做任何事情，方法 handlePost 永远不会被命中。我试图将属性“名称”更改为“更改”一词，但我不确定我做错了什么。
回答by Sotirios Delimanolis
Your issue isn't with Spring, it's with HTML. You cannot submit a button. You can only submit a <form>.
您的问题不在于 Spring，而在于 HTML。您不能提交按钮。您只能提交一个<form>.
Wrap your <input>element in a <form>
将您的<input>元素包裹在一个<form>
<form action="<c:url value="/test" />" method="GET">
<input type="submit" name="action" value="save" />
</form>
Where <c:url>is the urltag of the coretaglib. Now, when you click the button, the browser will serialize your <input>elements as url-encoded form parameters and send them. They will appear as request parameters to your server/web application. Spring will deserialize them by name and inject them as arguments where you have a @RequestParammethod parameter.
taglib<c:url>的url标签在哪里core。现在，当您单击按钮时，浏览器会将您的<input>元素序列化为url 编码的表单参数并发送它们。它们将作为服务器/Web 应用程序的请求参数出现。Spring 将按名称反序列化它们，并将它们作为参数注入到您有@RequestParam方法参数的地方。
回答by RekrowYnapmoc
There needs to be a form encapsulating your input.
需要有一个表单来封装您的输入。
General FYI: Your "save" and "renew" use cases should be separate controller actions.
一般仅供参考：您的“保存”和“更新”用例应该是单独的控制器操作。
Also consider removing "POST" from your action name. Seeing as the action is decorated with GET, and the html is saying its GET
还可以考虑从您的操作名称中删除“POST”。看到动作是用 GET 修饰的，而 html 说的是它的 GET
