servletshowdept.java

一个客户端和数据库服务器之间进行无线通信的例子

package system.dept.contorl;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.sql.ResultSet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import db.DbManage;


/**
 * 显示部门信息的SERVLET
 * @author foxliucong
 *
 */
public class ServletShowDept extends HttpServlet {

	/**建立操作数据库的对象*/
	DbManage dbm = new DbManage();
	/**保存返回的记录集*/
	ResultSet rs = null;
	
	/**各种属性*/
	String deptId;
	String deptName;
	String deptFuze;


	
	
	
	/**
	 * 构造函数
	 */
	public ServletShowDept() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost( request,  response);
	
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		response.setContentType("text/html; charset=GBK"); //设置响应属性 
		 InputStream is = request.getInputStream(); //接收客户端的请求 
			
		 DataInputStream dis = new DataInputStream(is); //这边建立一个在本地接受数据的，用于去读客户端写到流里面去的信息
		    //数据库处理
		 try{
		    dbm.getConnection();
		    String sql = "select * from tab_dept";
		    rs = dbm.executeSelect(sql);
		    
             // 发送处理后的结果给手机 
			DataOutputStream dos = new DataOutputStream(response.getOutputStream()); //写到输出流中，让客户端去读
		    while(rs.next()){
		    	  deptId = rs.getString(1);
		    	  deptName = rs.getString(2);
		          deptFuze= rs.getString(3);
		    	

				dos.writeUTF(deptId);//写到客户端去
				dos.writeUTF(deptName);
				dos.writeUTF(deptFuze);
		    	 }
	    }catch(Exception e){System.out.print(e); }
	     finally{
		   dbm.closeRs();
		   dbm.closeStmt();
		   dbm.closeConn();
		   }
			
			
	}


	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}