如何将表单数据导入角度控制器以及如何将其传递给 serlvet？

Question

我有一个包含两个<select>标签的表单。一个是年份列表，另一个是剂量列表。当我选择选项时selectedYear，我可以使用 ng-model 在我的控制器中获取，但无法获取selectedDosage. 当我试图将此数据发送到我的 servlet 时，它返回 null 作为值。我感谢 JSON 的任何建议Dosages:[    {"name":"Tablet"},    {"name":"Syrups and Suspension"},    {"name":"Non-Antibiotic Capsules"},    {"name":"Antibiotic Capsules"},    {"name":"Dry Powder for Suspension"},    {"name":"ORS"},    {"name":"Antiseptics"}]Years:{"json1":"[    {\"years\":2018},    {\"years\":2017},    {\"years\":2016},    {\"years\":2015}]"HTML<form  ng-submit="Display()">    <select class="form-control" ng-model="selectedYear">        <option value="" selected disabled>Select Year</option>        <option   ng-repeat="option in years" ng-value="{{option.years}}" >          {{option.years}}        </option>    </select>    <br>    <select class="form-control" ng-model="selectedDo">        <option value="" selected disabled>Select Dosage</option>        <option  ng-repeat="option in section" ng-value="{{option.name}}"  >          {{option.name}}        </option>    </select>    <input type="submit" value="Submit"/>       </form>控制器$scope.selectedDo;$scope.selectedYear;$scope.Display=function(){    $window.alert($scope.selectedDo+"..."+ $scope.selectedYear);    $http({        method:"post",        url:"/com.az.BusinessRatioAnalysis/SectionServlet",        data:{           year:$scope.selectedYear,           dosage:$scope.selectedDo,        }    }).then(function(result){        $window.alert("Ajex call failed" + result);                                 });};小服务程序public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        String year=request.getParameter("year");        String dosage=request.getParameter("dosage");                System.out.println(year+".."+dosage);    }

Answer 1

请尝试以下操作。

负载 Bean 类：

class Bean {

    Year year;

    Dosage dosage;

    //getters and setters

}

服务类：

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    StringBuilder json = new StringBuilder();

    String str;

    while ((str = request.getReader().readLine()) != null) {

        json.append(str);

    }

    // Using Jackson

    ObjectMapper objectMapper = new ObjectMapper();

    Bean bean = objectMapper.readValue(json.toString(), Bean.class);

    System.out.println("Year ::" + bean.getYear());

    System.out.println("Dosage ::" + bean.getDosage());

}

如果是 Maven 项目，则为 pom.xml 文件，否则相应地添加 jars：

<dependency>

    <groupId>com.fasterxml.jackson.core</groupId>

    <artifactId>jackson-databind</artifactId>

    <version>2.9.8</version>

</dependency>

PS：忽略上面代码中的异常处理