如何在Spring 2.x中将结果发送回

Question

I have a method which returns true or false based on some parameters. So I make an ajax call (using Ext.ajax.request). In spring 2.x version how do I send back the result? So for my controller I extend BaseSimpleCommandController and override the method

ModelAndView doExecute(HttpServletRequest request, HttpServletResponse response, Object command, BindException errors)

I want to know what would i need to do to send back just a boolean value. I am little confused as what needs to be done. I now i have to send back a ModelAndView type object but nor sure i should i embed a single boolean value in to this object.

EDIT: the BaseSimpleCommandController is specific to my project which in turn extends AbstractCommandController from spring. sorry for the confusion.

Answer 1

If you just want to return "true" or "false" there is no need to use models, command controllers, etc. Simply inject HttpServletResponse and send the data directly:

public void handle(HttpServletResponse response) {
  boolean flag = //...
  response.getWriter().print(flag);
}

Answer 2

Request params can be mapped via annotation in the method parameter, or through the request's parameter map

Method Parameter:

@RequestMapping(method=RequestMethod.GET)
public void someCall(@RequestParam(value="param1") String paramName)
...

Where param1 would be the get parameter param1. If you don't provide a value for the annotation, it tries to bind to the name of the parameter in the method name (paramName in this case).

Parameter Map

@RequestMapping(method=RequestMethod.GET)
public void someCall(HttpServletRequest request)
{
    Map<String, String[]> paramMap = request.getParameterMap();
}

Hope this helps!