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我似乎無法讓我的形式綁定到複選框控制。我在這裏讀了很多帖子，並嘗試了一些技巧，但沒有運氣。也許一個新的眼睛會有所幫助。春綁定列表<Object>形成：複選框
我的控制器：
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"/>
我使用的第二對每個環路（未示出），以確保模型對象包含角色。它確實，但沒有選中複選框，並且當我提交角色對象時總是空的。有人能告訴我我錯過了什麼嗎？
感謝
編輯
對不起剛剛意識到這可能是有益的，看看帳號和角色對象：
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;
}
}
編輯＃2
控制器後方法
@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是表單支持對象。當我進行GET時，我將獲取一個Account對象，並在顯示屏幕之前將這些值傳遞給AccountEditForm。爲了清楚起見，我將附上AccountEditForm。與賬戶對象非常相似。我碰巧把我的表單對象從我的模型對象中分離出來。
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);
}
}
編輯＃3角色屬性編輯器
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());
}
}
在我的控制器定義如下：
@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()));
}
編輯＃4 NEW ProeprtyEditor
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);
}
}
感謝您的答覆。我在我的角色對象中添加了等號，現在當我查看屏幕時，複選框已正確填充，但是當我進行更改或進行提交時，綁定到表單的帳戶對象的角色屬性始終爲空。 – blong824
@ blong824角色對象是否未提交，未在帳戶對象中填充或未保存的問題？ – Ralph
我刪除了所有要保存的代碼，並將打印語句添加到post方法中。角色對象始終爲空。所以不能在Account對象中填充。 – blong824