session对象使用示例

最新推荐文章于 2023-05-10 21:27:33 发布

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最新推荐文章于 2023-05-10 21:27:33 发布

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分类专栏： J2EE 文章标签： Struts Java JSP Apache Servlet

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本文介绍了一个基于Struts框架的简单登录案例，包括login.jsp和success.jsp两个页面的设计。通过表单提交用户名和密码，利用EL表达式在success.jsp页面显示登录成功的用户名。

携带用户名往下跳转的例子

首先把我们需要实现的功能用到的2 个页面建立好。login.jsp 和success.jsp

login.jsp



<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>

<body>
<form id="form1" name="form1" method="post" action="login1.do">
  用户名
  <label>
  <input name="username" type="text" id="username" />
  </label>
  <p>密码
    <label>
    <input name="password" type="text" id="password" />
    </label>
  </p>
  <p>
    <label>
    <input type="submit" name="Submit" value="提交" />
    </label>
  </p>
</form>

</body>
</html>

success.jsp


<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>

<body>
${name} 登陆成功
</body>

</html>

注意 ${name} 这里。这里边使用的就是EL表达式。目的就是为了把你在login.jsp中输入的用户名接过来显示在success.jsp中。${name}对应的是bb.setAttribute("name",username)
中的"name"，而username是从jsp中的username 属性中得到的。

1 个form


/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package form;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;

public class LoginForm extends ActionForm {
	/*
	 * Generated fields
	 */

	/** password property */
	private String password;

	/** username property */
	private String username;


	public ActionErrors validate(ActionMapping mapping,
			HttpServletRequest request) {
		// TODO Auto-generated method stub
		return null;
	}


	public void reset(ActionMapping mapping, HttpServletRequest request) {
		// TODO Auto-generated method stub
	}

	/** 
	 * Returns the password.
	 * @return String
	 */
	public String getPassword() {
		return password;
	}

	/** 
	 * Set the password.
	 * @param password The password to set
	 */
	public void setPassword(String password) {
		this.password = password;
	}

	/** 
	 * Returns the username.
	 * @return String
	 */
	public String getUsername() {
		return username;
	}

	/** 
	 * Set the username.
	 * @param username The username to set
	 */
	public void setUsername(String username) {
		this.username = username;
	}
}

1 个 action


package action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import form.LoginForm;

public class Login1Action extends Action {
	/**
	 * 这里面要用到session
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		LoginForm loginForm = (LoginForm) form;// TODO Auto-generated method stub
		HttpSession bb=request.getSession();//建立个session对象
		String username =loginForm.getUsername();
		String password =loginForm.getPassword();
		if (username.equals("w")&&password.equals("w")){
			bb.setAttribute("name",username);//用到的是setAttribute方法
			return mapping.findForward("ok");
		}

		return mapping.findForward("nook");
	}
}