Spring Controller向ajax请求返回视图或空字符串

@Controller
public class MyController {

    @RequestMapping(value = "/getView", method = RequestMethod.GET)
    public String getView() {
        // 这里可以添加业务逻辑
        return "viewName"; // 返回视图名称，Spring MVC会根据这个名字找到对应的视图文件
    }
}

@Controller
public class MyController {

    @RequestMapping(value = "/getEmptyString", method = RequestMethod.GET)
    @ResponseBody
    public String getEmptyString() {
        // 这里可以添加业务逻辑
        return ""; // 返回空字符串
    }
}

@Controller
public class MyController {

    @RequestMapping(value = "/getData", method = RequestMethod.GET)
    @ResponseBody
    public Map<String, Object> getData() {
        Map<String, Object> data = new HashMap<>();
        data.put("key", "value");
        return data; // 返回JSON格式的数据
    }
}

$.ajax({
    url: '/getData',
    type: 'GET',
    dataType: 'json',
    success: function(data) {
        console.log(data);
    },
    error: function(xhr, status, error) {
        console.error(error);
    }
});