我试图发送一个HashMap或任何其他Map实现从阿贾克斯到Spring MVC的控制器
I am trying to send a HashMap or any other Map implementation from ajax to a Spring MVC controller
下面是我如何做到这一点的细节:
Here's the detail of how I do it :
Ajax调用是如下
var tags = {};
tags["foo"] = "bar";
tags["whee"] = "whizzz";
$.post("doTestMap.do", {"tags" : tags }, function(data, textStatus, jqXHR) {
if (textStatus == 'success') {
//handle success
console.log("doTest returned " + data);
} else {
console.err("doTest returned " + data);
}
});
然后在控制器端,我有:
then on the controller side I have :
@RequestMapping(value="/publisher/doTestMap.do", method=RequestMethod.POST)
public @ResponseBody String doTestMap(@RequestParam(value = "tags", defaultValue = "") HashMap<String,String> tags, HttpServletRequest request) { //
System.out.println(tags);
return "cool";
}
不幸的是我系统地获得
Unfortunately I systematically get
org.springframework.beans.ConversionNotSupportedException: Failed to convert value of type 'java.lang.String' to required type 'java.util.Map'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [java.util.Map]: no matching editors or conversion strategy found
我是什么做错了吗?
What am I doing wrong ?
感谢你。
推荐答案
结合在弹簧控制器地图支持相同的方式结合的阵列。无特殊转换需要!
Binding a map in a spring controller is supported the same way as binding an array. No special converter needed!
有一件事要记住,虽然:
There is one thing to keep in mind though:
的春的用途的命令的对象(S)作为顶级值保持。一个命令对象可以是任何类。 Spring uses command object(s) as a top level value holder. A command object can be any class.因此,所有你需要的是一个包装类( TagsWrapper )持有类型的字段地图&LT;字符串,字符串&GT;
所谓的标签。
同样的方法,你需要绑定一个数组。
So all you need is a wrapper class (TagsWrapper
) which holds a field of type Map<String, String>
called tags.
The same approach you take to bind an array.
这是说明pretty的很好的文档,但我仍然会忘记的包装对象,需要过一段时间;)
This is explained pretty well in the docs but i kept forgetting the need of the wrapper object once in a while ;)
您需要更改的第二件事是你提交的变量值的方式:
The second thing you need to change is the way you submit the tags values:
使用每个地图密钥一种形式的参数,而不是一个完整的字符串重新完整的地图的presentation。一个输入值应该是这样的: use one form parameter per map key and not a full string representation of the complete map.
one input value should look like this:
<input type="text" name="tags[key]" value="something">
如果标签在包装的地图这个开箱的表单提交。
If tags is a map in a wrapper this works out of the box for form submits.
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