Spring MVC填充@RequestParam Map< String，String> [英] Spring MVC populate @RequestParam Map<String, String>

问题描述

我的Spring MVC @Controller中具有以下方法:

I have the following method in my Spring MVC @Controller :

@RequestMapping(method = RequestMethod.GET)
public String testUrl(@RequestParam(value="test") Map<String, String> test) {   
    (...)
}

我这样称呼它:

http://myUrl?test[A]=ABC&test[B]=DEF

但是测试" RequestParam变量始终为空

However the "test" RequestParam variable is always null

我该怎么做才能填充测试"变量?

What do I have to do in order to populate "test" variable ?

推荐答案

如此处所述 https://docs .spring.io/spring/docs/current/javadoc-api/org/springframework/web/bind/annotation/RequestParam.html

如果方法参数是Map或MultiValueMap，但未指定参数名称，则将使用所有请求参数名称和值填充map参数.

If the method parameter is Map or MultiValueMap and a parameter name is not specified, then the map parameter is populated with all request parameter names and values.

所以您将像这样更改定义.

So you would change your definition like this.

@RequestMapping(method = RequestMethod.GET)
public String testUrl(@RequestParam Map<String, String> parameters) 
{   
  (...)
}

在参数中，如果您调用了网址 http://myUrl?A = ABC& B = DEF

And in your parameters if you called the url http://myUrl?A=ABC&B=DEF

您将拥有自己的方法

parameters.get("A");
parameters.get("B");

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