如何将Javascript数组传递给Spring Controller类

Question

我创建了JS数组并尝试将数组传递给Controller类，但它显示的是NullPointerException。

我通过FireBug检查了URL，其中值正在传递，但是在控制器类中，如果我尝试检索它，则显示为NULL。

JavaScript代码：

var deleteWidgetId = new Array(); //array created 
deleteWidgetId[0] = "a";//adding values 
deleteWidgetId[1] = "b"; 
//action trigged 
$("#saveLayout").load("layout/saveLayout.action", 
 { deleteWidgetId : deleteWidgetId },      
 function(response, status, xhr) { });

Java代码（在控制器类中）：

@RequestMapping(value = "/saveLayout")
public ModelAndView saveLayout(@RequestParam String[] deleteWidgetId) throws Exception { 
    //here that if i try to use the deleteWidgetId it is giving null pointer exception
}

Answer 1

尝试使用List<String>代替String[]

Answer 2

您必须在注释中指定请求参数的名称：

@RequestMapping(value = "/saveLayout")
public ModelAndView saveLayout(@RequestParam(value="deleteWidgetId") String[] deleteWidgetId) throws Exception { 
    //here that if i try to use the deleteWidgetId it is giving null pointer exception
}