Spring Controller返回文本并提供下载，不用io，怎么做？

[little_nb]

//Spring 返回json数据
@RequestMapping(value = "/test/json/test_1.json")
@ResponseBody
public JSONObject test_1(){
	String str = "{"+ "\"x\":\"value_1\"" + "," + "\"y\":\"value_2\"" + "}";
	json = JSON.parseObject(str);
	return json;
}

//需求：Spring 返回json文本，提供下载，
//疑问增加produces后，406
@RequestMapping(value = "/test/json/test_1.json",  produces = {"text/plain;charset=UTF-8"})
@ResponseBody
public JSONObject test_1(){
	String str = "{"+ "\"x\":\"value_1\"" + "," + "\"y\":\"value_2\"" + "}";
	json = JSON.parseObject(str);
	return json;
}

谢谢！

[little_nb]

结帖。