[英]getSourceClassName method in java logRecord gives null value
[英]JSP Input value To Java Method -> HttpServletRequest gives NULL value
大家好。 我有一个简单的存储页面,它显示数据库中的所有产品。 我设置给他们每个人用唯一的名字来改变产品的数量。 当我想在 Java 方法中捕获这个值时,它返回给我 null 。 你能帮我在这个文本输入中正确地捕捉价值需要做些什么吗?
Controller:
@Controller
public class StoragePageController extends HttpServlet {
@GET
@RequestMapping(value = "/storage/subamount/{id}")
public String substractTheAmountValue(@PathVariable("id") int id, Model model, HttpServletRequest request) {
String amount_req = request.getParameter("amount_sub_" + id);
System.out.println(amount_req);
return null;
}
}
JSP 片段:
<c:set var="licznik" value="${recordStartCounter }" />
<div align="center">
<table width="1000" border="0" cellpadding="6" cellspacing="2">
<c:forEach var="u" items="${productList }">
<c:set var="licznik" value="${licznik+1}" />
<tr onmouseover="changeTrBg(this)" onmouseout="defaultTrBg(this)">
<td align="right"><c:out value="${licznik }" /></td>
<td align="left"><c:out value="${u.description }" /></td>
<td align="left"><c:out value="${u.amount }" /></td>
<td align="center"><input type="text" name="amount_sub_${licznik}" id="amount_sub_${licznik}"></td>
<td align="center"><input type="button" value="Substract the value" onclick="window.location.href='${pageContext.request.contextPath}/storage/subamount/${licznik}'"/></td>
</tr>
</c:forEach>
</table>
You should be having your API controller like the one given below given that your UI is posting the data to your API / Controller (assuming you are using the latest version of Spring Boot). 您有一个@Get
映射,它不接受正文中的请求有效负载。
@RestController
public class StoragePageController {
@PostMapping(value = "/storage/subamount/{id}", produces = {"application/json"})
public String substractTheAmountValue(@PathVariable("id") int id, Model model) {
String amount_req = id;
System.out.println(amount_req);
return null;
}
}
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