我想在点击相应的编辑按钮时更新用户详细信息home.jsp。中的字段edit.jsp可以由检索到的值填充。但是在单击保存按钮时edit.jsp，它显示空指针异常。
我认为更新操作没有被调用。任何帮助表示赞赏。
主页.jsp
<s:property value="#session.userid"/>
<tr>
<th>Name</th>
<th>Email</th>
<th>Address</th>
<th>Phone No</th>
<th>Actions</th>
</tr>
<s:iterator value="users">
<tr>
<td><a href=""><s:property value="name"/></a></td>
<td><s:property value="email"/></td>
<td><s:property value="address"/></td>
<td><s:property value="phno"/></td>
<td><a href="edit?id=<s:property value="id"/>">Edit</a> |
<a href="delete?id=<s:property value="id"/>">Delete</a></td>
</tr>
</s:iterator>
</table>
编辑.jsp
<s:form action="update">
<table>
<s:hidden name="id" value="%{u.id}"/>
<s:textfield name="name" label="Name" value="%{u.name}"/>
<s:textfield name="pwd" label="Password" value="%{u.pwd}"/>
<s:textfield name="email" label="Email" value="%{u.email}"/>
<s:textarea name="address" label="Address" rows="3" cols="14" value="%{u.address}"/>
<s:textfield name="phno" label="Mobile" value="%{u.phno}"/>
<%--<s:select label="Select Date of Month" name="months" headerKey="0" headerValue="--Select--"
list="allMonths" listKey="id" listValue="name"/>--%>
<s:select label="Select Date of Month" name="mid" headerKey="0"
headerValue="--Select--" list="months1" value="%{u.mid}"/>
<s:submit value="Save"/>
</table>
</s:form>
用户操作
public class UserAction extends ActionSupport{
String name, pwd, email, address;//, months;
int phno, id;
UserDao udao = new UserDao();
public void setId(int id) {
this.id = id;
}
public int getId() {
return id;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPhno() {
return phno;
}
public void setPhno(int phno) {
this.phno = phno;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public String updateUser()
{
u.setId(id);
u.setName(name);
u.setEmail(email);
u.setAddress(address);
u.setPhno(phno);
u.setPwd(pwd);
u.setMonths(mid);
udao.updateUserInfo(u);
return SUCCESS;
}
}
用户
@Entity
@Table(name="tbl_user")
public class User {
@Id
@GeneratedValue
@Column(name="user_id")
private int id;
public void setId(int id) {
this.id = id;
}
public int getId() {
return id;
}
@Column(name="user_phno")
int phno;
@Column(name="user_name")
private String name;
@Column(name="user_pwd")
private String pwd;
@Column(name="user_email")
private String email;
@Column(name="user_address")
private String address;
@Column(name="user_bmnth")
private int months;
public int getMonths() {
return months;
}
public void setMonths(int months) {
this.months = months;
}
public User(){}
public User(String name,String pwd,String email,String address,int phno,int months){
this.name = name;
this.pwd = pwd;
this.email = email;
this.address =address;
this.phno = phno;
this.months= months;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPhno() {
return phno;
}
public void setPhno(int phno) {
this.phno = phno;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
}
用户道
public class UserDao {
public Session getSession() {
return HibernateUtil.getSession();
}
public void closeSession() {
HibernateUtil.closeSession();
}
public void updateUserInfo(User user) {
Session s = getSession();
Transaction t = s.beginTransaction();
User u = (User) s.load(User.class, user.getId());
u.setAddress(user.getAddress());
u.setEmail(user.getEmail());
u.setMonths(user.getMonths());
u.setName(user.getName());
u.setPhno(user.getPhno());
u.setPwd(user.getPwd());
s.update(u);
t.commit();
closeSession();
}
}
struts.xml
<action name="update" class="action.UserAction" method="updateUser">
<result name="success" type="redirect">listUsers</result>
</action>