我正试图创建一个编辑表单，并用所选的对象值预填充到表单中，但它返回了404的HTTP状态，我得到的错误消息是
org.springframework.web.servlet.DispatcherServlet.noHandler未找到GET映射/AgentsCRUD/agent/edit/1；jsessionid=07E2EC08848D0C9346DC67563DF1F
我认为我所拥有的是非常合乎逻辑的，但我一定把映射搞砸了。
getAllAgent.jsp中的代码
<spring:message code="welcome.message" />
<body>
<table style="width:100%">
<tr>
<th align="left"><spring:message code="label.agentId" /></th>
<th align="left"><spring:message code="label.name" /></th>
<th align="left"><spring:message code="label.fax" /></th>
<th align="left"><spring:message code="label.phone" /></th>
<th align="left"><spring:message code="label.email" /></th>
<th align="left"><spring:message code="label.datejoined" /></th>
<th align="left"><spring:message code="label.sales" /></th>
<th align="left"><spring:message code="label.actions" /></th>
</tr>
<c:forEach items="${agentList}" var="agent">
<tr>
<td>${agent.agentId}</td>
<td>${agent.name}</td>
<td>${agent.fax}</td>
<td>${agent.phone}</td>
<td>${agent.email}</td>
<td>
<a href="AgentsCRUDagentdelete?agentId=${agent.agentId}"><spring:message code="label.delete" /></a>
<spring:url value="/agent/edit/${agent.agentId}" var="editURL"/>
<a href="${editURL}"><spring:message code="label.edit" /></a>
<a href="AgentsCRUDagentadd"><spring:message code="label.insert" /></a>
</td>
</tr>
</c:forEach>
</table>
</body>
控制器AgentController.java 中的代码
@GetMapping("/edit")
public ModelAndView EditAnAgent(@QueryParam("agentId") int agentId) {
return new ModelAndView("/editAgent", "agent", service.getAgentById(agentId));
}
@GetMapping("/editAgent")
public ModelAndView editAgent(@Valid @ModelAttribute("agent") Agents a, BindingResult result, ModelMap model) {
if (result.hasErrors()) {
return new ModelAndView("/editAgent");
}
service.editAgent(a);
return new ModelAndView("redirect:/agent");
}
Model AgentService.java 中的代码
public static Agents getAgentByID(int agentId) {
EntityManager em = DBUtil.getEMF().createEntityManager();
Agents a = null;
try {
a = em.createNamedQuery("Agents.findByAgentId", Agents.class)
.setParameter("agentId", (agentId))
.getSingleResult();
} catch (Exception ex) {
System.out.println("Error in getting property details: " + ex);
} finally {
em.clear();
}
return a;
}
public void editAgent(Agents a) {
EntityManager em = DBUtil.getEMF().createEntityManager();
EntityTransaction transaction = em.getTransaction();
try {
transaction.begin();
em.merge(a);
transaction.commit();
} catch (Exception e) {
System.out.println(e);
} finally {
em.close();
}
}
editAgent.jsp 中的代码
<form:form method="POST" action="/AgentsCRUD/agent/editAgent" modelAttribute="agent">
<table>
<tr>
<td><form:label path="agentId"><spring:message code="label.agentId" /></form:label></td>
<td><form:input path="agentId"/></td>
<td style="color:red"><form:errors path="agentId"/> </td>
</tr>
<tr>
<td><form:label path="name"><spring:message code="label.name" /></form:label></td>
<td><form:input path="name" /></td>
<td style="color:red"><form:errors path="name"/> </td>
</tr>
<tr>
<td><form:label path="phone"><spring:message code="label.phone" /></form:label></td>
<td><form:input path="phone"/></td>
<td style="color:red"><form:errors path="phone"/> </td>
</tr>
<tr>
<td><form:label path="fax"><spring:message code="label.fax" /></form:label></td>
<td><form:input path="fax"/></td>
<td style="color:red"> <form:errors path="fax"/> </td>
</tr>
<tr>
<td><form:label path="email"><spring:message code="label.email" /></form:label></td>
<td><form:input path="email"/></td>
<td style="color:red"> <form:errors path="email"/> </td>
</tr>
<tr>
<td><form:label path="username"><spring:message code="label.username" /></form:label></td>
<td><form:input path="username"/></td>
<td style="color:red"> <form:errors path="username"/> </td>
</tr>
<tr>
<td><form:label path="password"><spring:message code="label.password" /></form:label></td>
<td><form:input path="password"/></td>
<td style="color:red"> <form:errors path="password"/> </td>
</tr>
<tr>
<spring:message code="submit.button" var="labelSubmit"></spring:message>
<td><input type="submit" value="${labelSubmit}"/></td>
</tr>
</table>
</body>
</form:form>
在错误中，给出的url是/edit/1，其中1是路径参数，
但是，在get映射中，您正试图将其作为查询参数读取。
试试这个。
@GetMapping("/edit/{agentId}")
Patient getEmployee(@PathParam("agentId") int agentId) ;