从javascript调用java restful Web服务时返回值失败

我有一个用java编写的restful Web服务。我用javascript调用它

当我调用webservice时，所有代码都能完美地工作，但并不能完美地返回值。我的代码如下：

ws:

@RestController
public class VillageService {

    @Autowired

private InnerService innerService;


@RequestMapping(value = "/services/getVillages")
public  Village getAllVillages(@RequestParam int param) throws JSONException {

      long startTime = System.currentTimeMillis();
      Village result = innerService.getAllVillagesCacheable(param);
      long stopTime = System.currentTimeMillis();
      long elapsedTime = stopTime - startTime;
      System.out.println("süre: " + elapsedTime);         

      startTime = System.currentTimeMillis();
      Village result2 = innerService.getAllVillages(param);
      stopTime = System.currentTimeMillis();
      elapsedTime = stopTime - startTime;
      System.out.println("süre cache'siz: " + elapsedTime);       

      return result;
    }
}

        function callWS()
        {

        $.ajax({
            type: 'GET',
            url: 'http://localhost/services/getVillages/',
            data: "param=5", // the data in form-encoded format, ie as it would appear on a querystring
            dataType: "json", // the data type we want back, so text.  The data will come wrapped in xml
            success: function (data) {
                alert("party hard"); // show the string that was returned, this will be the data inside the xml wrapper
            },
            error: function (data) {
                alert("restful cagirmada hata"); // show the string that was returned, this will be the data inside the xml wrapper
            }
        });


        };

Js:

@RestController
public class VillageService {

    @Autowired

private InnerService innerService;


@RequestMapping(value = "/services/getVillages")
public  Village getAllVillages(@RequestParam int param) throws JSONException {

      long startTime = System.currentTimeMillis();
      Village result = innerService.getAllVillagesCacheable(param);
      long stopTime = System.currentTimeMillis();
      long elapsedTime = stopTime - startTime;
      System.out.println("süre: " + elapsedTime);         

      startTime = System.currentTimeMillis();
      Village result2 = innerService.getAllVillages(param);
      stopTime = System.currentTimeMillis();
      elapsedTime = stopTime - startTime;
      System.out.println("süre cache'siz: " + elapsedTime);       

      return result;
    }
}

        function callWS()
        {

        $.ajax({
            type: 'GET',
            url: 'http://localhost/services/getVillages/',
            data: "param=5", // the data in form-encoded format, ie as it would appear on a querystring
            dataType: "json", // the data type we want back, so text.  The data will come wrapped in xml
            success: function (data) {
                alert("party hard"); // show the string that was returned, this will be the data inside the xml wrapper
            },
            error: function (data) {
                alert("restful cagirmada hata"); // show the string that was returned, this will be the data inside the xml wrapper
            }
        });


        };

当我调用ws时，所有的“prinln”代码都能正常工作，但不返回值。我的js没有以“成功”结束，它陷入了“错误：”的情况

---

如何修复它？

您应该使用AJAX调用传递数据，如下所示：

data: {param:5},

使用HTTP请求读取参数，还需要对返回JSON的方法进行

@ResponseBody

注释：

@RequestMapping(value = "/services/getVillages")
@ResponseBody
public  Village getAllVillages(HttpServletRequest request) throws JSONException {
      String param = request.getParameter("param");

---

对

结果执行
System.out.println
并检查浏览器控制台是否有任何错误。对结果执行
System.out.println
并检查浏览器控制台是否有任何错误。我收到。。必需的跨源资源共享（CORS）错误好，这是你可以在谷歌上搜索的东西：在这里尝试建议的解决方案：thx回复。我找到了解决办法