从javascript调用java restful webservice时返回值失败

Question

我有一个用 java 编写的宁静的 web 服务。我用javascript调用它。

当我调用 web 服务时，所有代码都可以正常运行，但不能完美返回值。我的代码在这里：

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;
    }
}

Js：

        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“prinln”代码都可以正常工作，但不能返回值。我的 js 没有以“成功”结束，它属于“错误：”案例。

我该如何解决？

Answer 1

您应该使用 AJAX 调用传递数据：

data: {param:5},

使用 HTTP 请求读取参数，还需要为返回 JSON 的方法添加 @ResponseBody 注解：

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