看起来Spring MVC不知道如何将JavaScript中的“map”映射到Java map对象。
在Web界面(例如foo.jsp)中:
<script>
var myMap = {};
myMap["people"] = ["Alex","Bob","Charles","Dave"];
myMap["fruit"] = ["Apple","Orange"];
$.ajax({
type : "POST",
url : "/myURL",
data : "myMap=" + myMap, // I tried "myMap="+JSON.stringify(myMap), as well, it doesn't work neither
success : function(response) {
alert("Success! response = " + response);
},
error : function(e) {
alert("AJAX error");
}
});
</script>
在服务器端,我有一个数据模型类专门用于接收来自Web UI的数据。
@Setter @Getter
class Parameters {
private Map<String, List<String>> myMap; //this is the java class I want to map the string to
}
在控制器中,
@RequestMapping(value = "/myURL", method = RequestMethod.POST)
@ResponseBody
public List<String> fooControl(Parameters parameters ) {
// do something with parameters ...
}
我在服务器端遇到的错误如下:
[tomcat:launch] Aug 14, 2013 3:12:37 PM org.apache.catalina.core.StandardWrapperValve invoke
[tomcat:launch] SEVERE: Servlet.service() for servlet dispatcher threw exception
[tomcat:launch] org.springframework.validation.BindException:
org.springframework.validation.BeanPropertyBindingResult: 1 errors
[tomcat:launch] Field error in object 'Parameters ' on field
'myMap': rejected value [{"people":["Alex","Bob","Charles","Dave"],"fruit":
["Apple","Orange"]}]; codes
[typeMismatch.repairInfomationParametersExperimental.constraints,typeMismatch.constraints,typeMismatch.java.util.Map,typeMismatch]; arguments
[org.springframework.context.support.DefaultMessageSourceResolvable: codes
[repairInfomationParametersExperimental.constraints,constraints]; arguments []; default message
[constraints]]; default message [Failed to convert property value of type 'java.lang.String' to
required type 'java.util.Map' for property 'constraints'; nested exception is
java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type
[java.util.Map] for property 'myMap': no matching editors or conversion strategy found]
我猜应该有一种方法可以告诉Spring如何将JSON格式的字符串映射到Java Map中,谢谢!