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[英]Java Spring MVC View Render and Bind ArrayList<CustomModel> back to Controller with Form Submit
[英]Spring MVC passing ArrayList back to controller
我是Spring的新手。 我顯示一個用戶列表。 每行都有一個用於刪除用戶的復選框。
控制器:
@Controller
public class AdminController {
@Autowired
private UserDao userDao;
@RequestMapping(value = "/admin", method = RequestMethod.GET)
public ModelAndView adminPage() {
ModelAndView model = new ModelAndView();
model.addObject("users", userDao.findAll());
model.setViewName("admin");
return model;
}
@RequestMapping(value = "admin/remove", method = RequestMethod.POST)
public ModelAndView removeUser(@ModelAttribute(value = "users") ArrayList<User> users) {
ModelAndView model = new ModelAndView();
//UPDATE USERS HERE
model.setViewName("redirect:/admin");
return model;
}
JSP:
<form:form action="/admin/remove" method="POST" modelAttribute="users">
<table class="table table-striped">
<thead>
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Email/login</th>
<th>Profession</th>
<th>Select<th>
</tr>
</thead>
<tbody>
<c:forEach var="user" items="${users}">
<tr>
<td>${user.firstName}</td>
<td>${user.lastName}</td>
<td>${user.login}</td>
<td>${user.profession}</td>
<td><input type="checkbox" value="${user.delete}"/></td>
</tr>
</c:forEach>
</tbody>
</table>
<input type="submit" value="Delete user(s)" class="btn-danger" />
<input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}" />
</form:form>
列表正確呈現。 如果我按“刪除用戶”按鈕。 @modelAttribute用戶為空。 我也嘗試將列表包裝在一個新類中,但我得到了相同的結果。
有任何想法嗎?
感謝minion,我找到了答案
包裝:
public class UserListWrapper {
private ArrayList<User> users;
public ArrayList<User> getUsers() {
return users;
}
public void setUsers(ArrayList<User> users) {
this.users = users;
}
控制器:
@Controller
public class AdminController {
@Autowired
private UserDao userDao;
@RequestMapping(value = "/admin", method = RequestMethod.GET)
public ModelAndView adminPage() {
ModelAndView model = new ModelAndView();
UserListWrapper wrapper = new UserListWrapper();
wrapper.setUsers(new ArrayList<User>(userDao.findAll()));
model.addObject("userListWrapper",wrapper);
model.setViewName("admin");
return model;
}
@RequestMapping(value = "admin/remove", method = RequestMethod.POST)
public ModelAndView removeUser(@ModelAttribute(value = "userListWrapper") UserListWrapper userListWrapper) {
ModelAndView model = new ModelAndView();
userDao.removeFlaggedUsers(userListWrapper.getUsers());
model.setViewName("redirect:/admin");
return model;
}
}
視圖:
<form:form action="/admin/remove" method="POST" modelAttribute="userListWrapper">
<table class="table table-striped">
<thead>
<tr>
<th>First name</th>
<th>Last name</th>
<th>Email/login</th>
<th>Profession</th>
<th>Select<th>
</tr>
</thead>
<tbody>
<c:forEach varStatus="us" var="user" items="${userListWrapper.users}" >
<tr>
<td><form:input type="hidden" path="users[${us.index}].firstName"/>${user.firstName}</td>
<td><form:input type="hidden" path="users[${us.index}].lastName"/> ${user.lastName}</td>
<td><form:input type="hidden" path="users[${us.index}].login"/>${user.login}</td>
<td><form:input type="hidden" path="users[${us.index}].profession"/>${user.profession}</td>
<td><form:checkbox path="users[${us.index}].delete" value="${user.delete}"/></td>
<form:input type="hidden" path="users[${us.index}].id"/>
</tr>
</c:forEach>
</tbody>
</table>
<input type="submit" value="Delete user(s)" class="btn-danger" />
<input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}" />
</form:form>
謝謝!
編輯:別忘了也添加你沒有顯示的字段。
例如:
如果您不添加id,則刪除將無效,因為返回的User對象中的id將為NULL。
您的ModelAttribute為空,因為從您的jsp到您的模型屬性沒有發生表單數據綁定。 看一下Spring樣本如何綁定集合“ http://developer.ucsd.edu/develop/user-interface/building-a-form/form-binding-with-collections.html ”。 這有助於您理解。
大多數Spring應用程序通常使用form:input with“ path ”參數來進行數據綁定。
您應該圍繞spring-mvc select標記構建您的功能。 盡管如此,幾乎沒有變化,將列表推送到POJO類,例如
public class FormBean {
private List<String> users;
public FormBean() {
}
public List<String> getUsers() {
return users;
}
public void setUsers(List<String> users) {
this.users = users;
}
}
將映射更改為
@RequestMapping(value = "admin/remove", method = RequestMethod.POST)
public ModelAndView removeUser(@ModelAttribute(value = "formBean") FormBean formBean) {
最后,用spring 選擇標簽交換你的c:forEach ,就像這樣
<form:form action="/admin/remove" method="POST" modelAttribute="formBean">
...
<form:select path="users" items="${users}" multiple="true" />
...
</form>
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