src/com/action/StudentQC.java

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package com.action;

import java.io.PrintWriter;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;

import com.bean.*;
import com.dao.*;


public class StudentQC extends ActionSupport {

	//下面是Action内用于封装用户请求参数的属性
	private String Student_Username;
	
	public String getStudent_Username() {
		return Student_Username;
	}

	public void setStudent_Username(String studentUsername) {
		Student_Username = studentUsername;
	}
	private StudentBean cnbean;
	public StudentBean getCnbean() {
		return cnbean;
	}

	public void setCnbean(StudentBean cnbean) {
		this.cnbean = cnbean;
	}

	//处理用户请求的execute方法
	public String execute() throws Exception {
		
		//解决乱码，用于页面输出
		HttpServletResponse response=null;
		response=ServletActionContext.getResponse();
		response.setContentType("text/html;charset=UTF-8");
		response.setCharacterEncoding("UTF-8");
		PrintWriter out = response.getWriter();
		
		//创建session对象
		HttpSession session = ServletActionContext.getRequest().getSession();
		//验证是否正常登录
		if(session.getAttribute("id")==null){
			out.print("<script language='javascript'>alert('请重新登录！');window.location='Login.jsp';</script>");
			out.flush();out.close();return null;
		}
		
		//查询是否存在
		List<StudentBean> list=new StudentDao().GetList("Student_Username='"+Student_Username+"' and Student_State='入住'", "");
		if(list.size()<1)
		{
			out.print("<script language='javascript'>alert('学号不存在，或学生未处于入住状态！');history.back(-1);</script>");
			out.flush();out.close();return null;
		}