java 如何将参数从jsp传递到spring mvc控制器
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how to pass param from jsp to spring mvc controller
提问by MdC
My spring mvc controller has a method:
我的 spring mvc 控制器有一个方法：
@RequestMapping(value = "/search", method = RequestMethod.POST)
public ModelAndView search(@RequestParam("cn") String cn) {
//do stuff
return mav;
}
And I have a JSP page, where I'd like to send the value of the string cn:
我有一个 JSP 页面，我想在其中发送字符串 cn 的值：
<html>
<head><title>Search Entry</title></head>
<body>
<h3>Search entry</h3>
<a href="search"><input type="text" name="cn" value="search">
<button type="submit">Search</button>
</a>
</body>
</html>
I'm sure the jsp has something wrong, now the status message says:
我确定 jsp 有问题，现在状态消息说：
"Request method 'GET' not supported".
“不支持请求方法‘GET’”。
If I delete method = RequestMethod.POST it says:
如果我删除 method = RequestMethod.POST 它说：
"Required String parameter 'cn' is not present; description: The request sent by the client was syntactically incorrect"
“Required String parameter 'cn' is not present；描述：客户端发送的请求在语法上不正确”
回答by Paulius Matulionis
I can see that your are using Spring annotations so what you need to do is to modify your JSP to have a form instead of a link like this:
我可以看到您正在使用 Spring 注释，因此您需要做的是修改您的 JSP 以拥有一个表单而不是这样的链接：
<html>
<head><title>Search Entry</title></head>
<body>
<h3>Search entry</h3>
<form action="search" method="post">
<input type="text" name="cn" value="search">
<button type="submit">Search</button>
</form>
</body>
</html>
If you want a GET method to work you need to modify your controller's method to accept GET and change your JSP like this:
如果您希望 GET 方法起作用，您需要修改控制器的方法以接受 GET 并像这样更改您的 JSP：
<html>
<head><title>Search Entry</title></head>
<body>
<h3>Search entry</h3>
<a href="search?cn=search">
Search
</a>
</body>
</html>
If you want your parameter to be not mandatory you can modify your @RequestParamannotation like this:
如果您希望您的参数不是强制性的，您可以像这样修改您的@RequestParam注释：
@RequestParam(value = "cn", required = false) String cn
回答by Paulius Matulionis
you need to Define action="search"inside form tag that should be work
你需要定义action="search"应该工作的内部表单标签
回答by Anand Dwivedi
Change your HTML :
更改您的 HTML ：
<html>
<head><title>Search Entry</title></head>
<body>
<h3>Search entry</h3>
<a href="search"><input type="text" name="cn" value="search" action="search">
<button type="submit">Search</button>
</a>
</body>
</html>
or else follow this link:
或者点击这个链接：
