📄 createdirservlet.java

📁 一般网页里面实现图片切换的这个电子相册的代码
💻 JAVA
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import java.io.IOException;
import java.io.PrintWriter;

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

import java.sql.*;
import java.util.*;
import java.io.File;

public class CreateDirservlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public CreateDirservlet() {
		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 {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out
				.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the GET method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @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 doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		/*
		 * out .println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01
		 * Transitional//EN\">"); out.println("<HTML>"); out.println(" <HEAD><TITLE>A
		 * Servlet</TITLE></HEAD>"); out.println(" <BODY>"); out.print(" This
		 * is "); out.print(this.getClass()); out.println(", using the POST
		 * method"); out.println(" </BODY>"); out.println("</HTML>");
		 * out.flush(); out.close();
		 */
		String go="../Createdir.jsp";
		try {
			
			HttpSession session = request.getSession(true);
			String myid=(String)session.getAttribute("id");
			int total = 0;
			Class.forName("com.mysql.jdbc.Driver");
			Connection c = DriverManager
					.getConnection("jdbc:mysql://localhost/myphone?user=root&password=123456"); // 连接mysql数据库
			Statement s = c.createStatement();

			int k = 0;
			String dir=request.getParameter("Mydir");
			int flag = 0;
				
			String sql = "select * from userdir where ID='" + myid+"' and dirname='"+dir +"'";
			System.out.println(sql);
			ResultSet r = s.executeQuery(sql);
			
			
			while(r.next())
			{
				flag = 1;
				go="../Createdir.jsp";
			}
			if(flag==0)
			{
				sql = "insert into userdir values('"+myid+"','"+dir+"')";
				System.out.println("create dir: "+sql);
				s.executeUpdate(sql);
				go="../Createdir.jsp";
			}
			s.close();
			
			String path = request.getRealPath("");
			path ="C:\\test\\"+myid+"\\"+dir;
			java.io.File d = new java.io.File(path);// 建立代表Sub目录的File对象，并得到它的一个引用
			if (d.exists()) {// 检查Sub目录是否存在
				//d.delete();
				out.println("myid目录存在，已删除");
			} else {
				d.mkdir();// 建立myid目录
				out.println("myid目录不存在，已建立");
			} 

			} catch (Exception e) {
				e.printStackTrace();
			}
		
		
		response.sendRedirect(go);
	}

	/**
	 * The doPut method of the servlet. <br>
	 *
	 * This method is called when a HTTP put request is received.
	 * 
	 * @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 doPut(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		// Put your code here
	}

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

}
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