我正在尝试用于Java的Wicket框架,并通过构建简单的登录应用程序开始。 有两个页面,分别是包含登录表单的login.java(和.html)以及仅显示登录页面中输入的登录名和密码的NextPage.java(和html)。 为了实现页面变量的传递,我使用了wicket提供的PageParameters类。为什么在类型PageParameters上使用containsKey()和getString()时会出现错误?
login.java:
package com.myassignment;
import org.apache.wicket.markup.html.form.TextField;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.PasswordTextField;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.request.mapper.parameter.PageParameters;
public class login extends WebPage {
private Form form;
private TextField userIDField;
private PasswordTextField passwordField;
public login(){
userIDField = new TextField("user_id", new Model(""));
passwordField = new PasswordTextField("password", new Model(""));
userIDField.add(new TextValidator());
passwordField.add(new TextValidator());
userIDField.setRequired(true);
passwordField.setRequired(true);
Form form = new Form("login_form") {
@Override
protected void onSubmit() {
String USRNAME = login.this.getUsername();
String PWD = login.this.getPassword();
System.out.println("You entered USER_ID: "+ USRNAME +" and PASSWORD: " + PWD);
PageParameters para = new PageParameters();
para.add("username", USRNAME);
para.add("password", PWD);
setResponsePage(NextPage.class, para);
}
};
form.add(userIDField);
form.add(passwordField);
add(form);
}
protected String getUsername() {
return userIDField.getDefaultModelObjectAsString();
}
protected String getPassword() {
return passwordField.getModelObject();
}
}
NextPage.java:
package com.myassignment;
import org.apache.wicket.request.mapper.parameter.PageParameters;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.WebPage;
public class NextPage extends WebPage {
private Label unameLabel;
private Label passwordLabel;
public NextPage(PageParameters para) {
System.out.println(para);
String uname = ""+para;
String password = ""+para;
if(para.containsKey("uname")){
uname = para.getString("uname");
}
unameLabel = new Label("username_label", uname);
passwordLabel = new Label("password_label", password);
add(unameLabel);
add(passwordLabel);
}
}
然而,在代码中的错误,并The method containsKey(String) is undefined for the type PageParameters
The method getString(String) is undefined for the type PageParameters
原本不存在,根据教程上网页以及apache.wicket.org中的文档,其中明确提到containsKey是PageParameters的继承方法。我一直在努力寻找一个解决方案几个小时,但还没有达到任何地方。 我是Java的新手,对Wicket绝对陌生。
注意:当我删除containsKey()
和getString()
代码部分时,它会在单击提交后成功地将用户名和密码输出到系统控制台。
我使用Apache Wicket 6.18,jdk 1.7和Eclipse Juno IDE。
http://ci.apache.org/projects/wicket/apidocs/6.x/org/apache/wicket/request/mapper/parameter/PageParameters.html:你在哪里看到一个方法containsKey()和一个方法getString()? –
@JBNizet https://wicket.apache.org/apidocs/1.4/org/apache/wicket/PageParameters.html 方法摘要 - > 从类继承的java.util.HashMap - >的containsKey 也,HTTP ://www.mkyong.com/wicket/wicket-pageparameters-example/ 我相信这个人知道他在网上发布工作示例时他在干什么。 – bhatGautam
查看URL:这是1.4版本的javadoc。你正在使用6.18。 –