Java 在jsf页面中显示bean值_Java_Jsf 2

Java 在jsf页面中显示bean值

java jsf-2

Java 在jsf页面中显示bean值,java,jsf-2,Java,Jsf 2,这是我的登录栏： @ManagedBean @ViewScoped public class LoginBean implements Serializable { private String email; private String password; private LoginBean currentUser; CustomerService customerService = new CustomerService(); public String login() { c

这是我的

登录栏

：

@ManagedBean
@ViewScoped
public class LoginBean implements Serializable {

private String email;
private String password;
private LoginBean currentUser;

CustomerService customerService = new CustomerService();

public String login() {
    currentUser = customerService.findCustomerByUserPass(email, password);

    if (getCurrentUser() != null) {
         username = customerService.getCustomerUsername(email);// i want to display this in xhtml page
        return "Home2?faces-redirect=true";
    }
    else{
        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Unknown login, try again"));
        return (email = password = null);
    }
}

public boolean isLoggedIn() {
    return getCurrentUser() != null;
}
    public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = password;
}

public LoginBean getCurrentUser() {
    return currentUser;
}

public String getUsername() {
    return username;
}

public void setUsername(String username) {
    this.username = username;
}

public LoginBean getCurrentUser() {
    return currentUser;
}
}

这是我的

jsf

页面：

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://xmlns.jcp.org/jsf/html">
    <h:head>
    </h:head>
    <h:body>
        <h:panelGroup rendered="#{loginBean.loggedIn}">
            <p>Welcome #{loginBean.currentUser.username} </p>
        </h:panelGroup>
    </h:body>
</html>


欢迎#{loginBean.currentUser.username}

但结果显示为：

welcome

，

username

为

null

为什么？

您应该使用

sessionScoped

而不是

ViewScoped

bean

您的

currentUser

类型应该与数据库

表的类型相同，类似于客户的类型，而不是登录域的类型
然后您可以访问当前用户的用户名值
在哪里填充用户名
？它是否填充了null
也许？getUserName方法是什么样子的？还有，为什么loginBean.currentUser的类型是loginBean？