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[英]How to get the values of dropdownlist, radio button from a jsp and send it to servlet?
[英]How get values from radio button in jsp and pass them to java servlet
我在将值从jsp传递到Java servlet时遇到问题。 我班的学生有以下字段:id,firstName,lastName,precenseStatus。 字段precenseStatus为空,并且要在jsp中为其设置“ Obecny”,“ Nieobecny”或“Spóźniony”字符串值。 我将jsp列表传递给Student对象(学生)。
jsp:
<form action="updatePrecensesServlet" method="post">
<table class="table table-striped">
<thead>
<tr>
<th>Imię</th>
<th>Nazwisko</th>
<th>Obecność</th>
</tr>
</thead>
<tbody>
<c:forEach var="student" items="${students}">
<tr>
<td><c:out value="${student.firstName}" /></td>
<td><c:out value="${student.lastName}" /></td>
<td>
<form role="form">
<c:if test="${student.precenseStatus == 'Obecny'}">
<label class="radio-inline">
<input checked type="radio" name="${student.precenseStatus}" value="Obecny"/>Obecny
</label>
<label class="radio-inline">
<input type="radio" name="${student.precenseStatus}" value="Nieobecny"/>Nieobecny
</label>
<label class="radio-inline">
<input type="radio" name="${student.precenseStatus}" value="Spóźniony"/>Spóźniony
</label>
</c:if>
<c:if test="${student.precenseStatus == 'Nieobecny'}">
<label class="radio-inline">
<input type="radio" name="${student.precenseStatus}" value="Obecny"/>Obecny
</label>
<label class="radio-inline">
<input checked type="radio" name="${student.precenseStatus}" value="Nieobecny"/>Nieobecny
</label>
<label class="radio-inline">
<input type="radio" name="${student.precenseStatus}" value="Spóźniony"/>Spóźniony
</label>
</c:if>
<c:if test="${student.precenseStatus == 'Spó?niony'}">
<label class="radio-inline">
<input type="radio" name="${student.precenseStatus}" value="Obecny"/>Obecny
</label>
<label class="radio-inline">
<input type="radio" name="${student.precenseStatus}" value="Nieobecny"/>Nieobecny
</label>
<label class="radio-inline">
<input checked type="radio" name="${student.precenseStatus}" value="Spóźniony"/>Spóźniony
</label>
</c:if>
<c:if test="${student.precenseStatus != 'Obecny' &&
student.precenseStatus != 'Nieobecny' &&
student.precenseStatus != 'Spó?niony'}">
<label class="radio-inline">
<input type="radio" name="${student.precenseStatus}" value="Obecny"/>Obecny
</label>
<label class="radio-inline">
<input type="radio" name="${student.precenseStatus}" value="Nieobecny"/>Nieobecny
</label>
<label class="radio-inline">
<input type="radio" name="${student.precenseStatus}" value="Spóźniony"/>Spóźniony
</label>
</c:if>
</form>
</td>
</tr>
</c:forEach>
</tbody>
</table>
<button name="students" value="${student}" scope="request" type="submit" class="btn btn-success">Zatwierdź</button>
</form>
updatePrecensesServlet doPost():
System.out.println(request.getParameterValues("students").toString());
要么
System.out.println(request.getParameter("students").toString());
不起作用:/
Student{ID=2, firstName=YYY, lastName=XXX, precenseStatus=null}
我通过关注列表:
Student{ID=2, firstName=YYY, lastName=XXX, precenseStatus=null}
Student{ID=3, firstName=AAA, lastName=FFF, precenseStatus=null}
Student{ID=4, firstName=BBB, lastName=DDD, precenseStatus=null}
Student{ID=5, firstName=CCC, lastName=WWW, precenseStatus=null}
我希望我已经设置了precenseStatus字段的学生列表。 例如:
Student{ID=2, firstName=YYY, lastName=XXX, precenseStatus=Obecny}
Student{ID=3, firstName=AAA, lastName=FFF, precenseStatus=Nieobecny}
Student{ID=4, firstName=BBB, lastName=DDD, precenseStatus=Obecny}
Student{ID=5, firstName=CCC, lastName=WWW, precenseStatus=Spóźniony}
但是现在仍然是:
Student{ID=2, firstName=YYY, lastName=XXX, precenseStatus=null}
Student{ID=3, firstName=AAA, lastName=FFF, precenseStatus=null}
Student{ID=4, firstName=BBB, lastName=DDD, precenseStatus=null}
Student{ID=5, firstName=CCC, lastName=WWW, precenseStatus=null}
我已经选择了jsp中的所有单选按钮。 我没有将那些单选按钮留空。
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