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我正在尝试通过 Spring MVC 对 Java 方法（返回字符串）进行 ajax 调用。下面的这段 javascript 代码成功地调用了 Java 方法并将我期望的内容打印到 Eclipse 控制台。我正在尝试输出我刚刚在我的 html 页面上提到的文本。我的问题是，甚至都没有输入成功或错误回调函数，所以很明显我无法获得 Java 方法返回的信息。

提前致谢

$("#dateButton").click(function(e){

            fromdate = $("input#fromdate").val();
            todate = $("input#todate").val();
            fromcurr = $("input#fromcurr").val();

            tocurr = $("input#tocurr").val();

            var dataString = "fromdate=" +fromdate+"&todate="+todate+"&fromcurr="+fromcurr+"&tocurr="+tocurr;
            $.ajax({
                type: "post",
                url: "getDailyRates.html",
                data: dataString,
                datatype: "text",
                async: 'false',
                success: function(data, textStatus, jqXHR){
                    alert("in success");
                    $('#display').html("");

                    $('#display').append(data);
                },
                error: function(){
                    alert("ERROR!");
                }
            });



        });

Java方法

@RequestMapping(value = "/getDailyRates.html", method = RequestMethod.POST)
    public String getDailyRates(HttpServletRequest request, HttpServletResponse response ) {

        DailyRatesQuery dailyRate= new DailyRatesQuery();
        String fromCurr= request.getParameter("fromcurr");
        String toCurr= request.getParameter("tocurr"); 
        String fromDate= request.getParameter("fromdate"); 
        String toDate=request.getParameter("todate");

        dailyRate.setFromCurr(fromCurr);
        dailyRate.setToCurr(toCurr);
        dailyRate.setFromDate(fromDate);
        dailyRate.setToDate(toDate);


        System.out.println("From Currency: "+fromCurr+" To Currency: "+toCurr+
                " fromDate: "+fromDate+" toDate: "+toDate);


        List<DailyRate> rates = jdbcRateDao.getDailyRates(dailyRate);


        System.out.println("Before return new model");
        System.out.println(rates.toString());
        return rates.get(0).toString();

    }

更新：

当我单击 JavaScript 函数映射到的按钮时，我发布的 Java 方法被成功调用并生成正确的输出。只是没有将该输出发送回我的 JSP。

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