我似乎无法让我的表单绑定(bind)到复选框控件。我在这里阅读了很多帖子并尝试了一些技巧但没有运气。也许一双全新的眼睛会有所帮助。
我的 Controller :
public String editAccount(@RequestParam("id") String id, Model model) {
model.addAttribute("account", accountService.getAccount(id));
model.addAttribute("allRoles", roleService.getRoles());
return EDIT_ACCOUNT;
}
我的jsp:
<form:form action="" modelAttribute="account">
<form:checkboxes items="${allRoles}" path="roles" itemLabel="name" itemValue="id" delimiter="<br/>"/>
</form>
生成的 html:
<span><input id="roles1" name="roles" type="checkbox" value="1"/><label for="roles1">User</label></span><span><br/><input id="roles2" name="roles" type="checkbox" value="2"/><label for="roles2">Admin</label></span><span><br/><input id="roles3" name="roles" type="checkbox" value="3"/><label for="roles3">SuperAdmin</label></span<input type="hidden" name="_roles" value="on"/>
我为每个循环(未显示)使用了一秒钟,以确保模型对象包含角色。它确实如此,但没有选中任何复选框,当我提交角色对象时,它始终为空。有人可以告诉我我缺少什么吗?
谢谢
编辑
抱歉,刚刚意识到查看帐户和角色对象可能会有所帮助:
public class Account {
private String username, firstName, lastName, email;
private List<Role> roles;
@NotNull
@Size(min = 1, max = 50)
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@NotNull
@Size(min = 1, max = 50)
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
@NotNull
@Size(min = 1, max = 50)
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
@NotNull
@Size(min = 6, max = 50)
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public List<Role> getRoles() {
return roles;
}
public void setRoles(List<Role> roles) {
this.roles = roles;
}
public String toString() {
return ReflectionToStringBuilder.toString(this);
}
}
public class Role {
private int id;
private String name;
public Role() {}
public Role(int id, String name) {
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@NotNull
@Size(min = 1, max = 50)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
编辑#2
Controller 发布方法
@RequestMapping(value = "edit", method = RequestMethod.POST)
public String updateAccount(@RequestParam("id") String id, @ModelAttribute("account") @Valid AccountEditForm form, BindingResult result) {
System.out.println("FORM VALUES AFTER: " + form);
return (result.hasErrors() ? EDIT_ACCOUNT : ACCOUNT_REDIRECT);
}
AccountEditForm 是表单支持对象。当我执行 GET 操作时,我会获取一个 Account 对象并将值传递到 AccountEditForm 中,然后再显示屏幕。为了清楚起见,我将附上 AccountEditForm。它与帐户对象非常相似。我只是碰巧将表单对象与模型对象分开。
public class AccountEditForm {
private String username, firstName, lastName, email;
private List<Role> roles = new ArrayList<Role>();
@NotNull
@Size(min = 1, max = 50)
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@NotNull
@Size(min = 1, max = 50)
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
@NotNull
@Size(min = 1, max = 50)
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
@NotNull
@Size(min = 6, max = 50)
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public List<Role> getRoles() {
return roles;
}
public void setRoles(List<Role> roles) {
this.roles = roles;
}
public String toString() {
return ReflectionToStringBuilder.toString(this);
}
}
编辑 #3 角色属性编辑器
public class RolePropertyEditor extends PropertyEditorSupport {
private Map<Integer, Role> roleMap = new HashMap<Integer, Role>();
public RolePropertyEditor(List<Role> roleList) {
for (Role r : roleList) roleMap.put(r.getId(), r);
}
public void setAsText(String incomingId) {
Role role = roleMap.get(incomingId);
System.out.println("PROPERTY EDITOR ROLE " + role);
setValue(role);
}
public String getAsText() {
System.out.println("PROPERTY EDITOR ID " + ((Role)getValue()).getId());
return String.valueOf(((Role)getValue()).getId());
}
}
在我的 Controller 中定义如下:
@InitBinder
public void initBinder(WebDataBinder binder) {
binder.setAllowedFields(new String[] {
"username", "password", "confirmPassword", "firstName", "lastName", "email", "acceptTerms", "currentPassword"
});
binder.registerCustomEditor(Role.class, new RolePropertyEditor(roleService.getRoles()));
}
编辑 #4 新的属性编辑器
public class SecurityRolePropertyEditor extends PropertyEditorSupport {
private RoleService roleService;
public SecurityRolePropertyEditor(RoleService roleService) {
this.roleService = roleService;
}
public void setAsText(final String name) {
Role role = roleService.getRoleByName(name);
setValue(role);
}
}
最佳答案
向您的 Roles 实体添加一个 equals 方法。
看这个answer (Spring MVC Pre Populate Checkboxes) : 有关更多详细信息的类似问题。
关于java - Spring Binding List<Object> 到 Form :checkboxes,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7421346/