我有一個包含兩個<select>標簽的表單。一個是年份列表，另一個是劑量列表。當我選擇選項時selectedYear，我可以使用 ng-model 在我的控制器中獲取，但無法獲取selectedDosage. 當我試圖將此數據發送到我的 servlet 時，它返回 null 作為值。我感謝 JSON 的任何建議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); });};小服務程序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); }
1 回答
小唯快跑啊
TA貢獻1863條經驗 獲得超2個贊
請嘗試以下操作。
負載 Bean 類：
class Bean {
Year year;
Dosage dosage;
//getters and setters
}
服務類：
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 項目，則為 pom.xml 文件，否則相應地添加 jars：
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.8</version>
</dependency>
PS：忽略上面代碼中的異常處理
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