毕业设计论文-IT计算机-[其他类别]JSP无限级分类目录树

共35个文件

jsp：15个

gif：9个

class：2个

毕业设计

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程序源码

JAVA后台

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毕业设计论文-IT计算机-[其他类别]JSP无限级分类目录树_sorttree-源码.zip （35个子文件）

[其他类别]JSP无限级分类目录树_sorttree

sortTree

.classpath 433B

.mymetadata 297B

src

tree

MySort.java 4KB

bean

SortBean.java 3KB

WebRoot

WEB-INF

classes

tree

MySort.class 5KB

bean

SortBean.class 3KB

lib

mysql-connector-java-5.0.3-bin.jar 482KB

web.xml 428B

web

show.jsp 758B

conn.jsp 124B

left.jsp 759B

top.jsp 904B

bottom.jsp 430B

index.jsp 1KB

update_exec_conf.jsp 798B

delete_exec.jsp 1KB

update_exec.jsp 2KB

delete.jsp 866B

delete_exec_conf.jsp 418B

add.jsp 1KB

add_exec.jsp 724B

images

lastnodeline.gif 841B

close.gif 962B

transparent.gif 43B

midclosedfolder.gif 870B

midopenedfolder.gif 865B

vertline.gif 843B

open.gif 937B

midnodeline.gif 851B

line.gif 860B

main.jsp 1KB

update.jsp 866B

META-INF

MANIFEST.MF 39B

.project 1KB

.myeclipse

芝麻粒儿-CSDN.url 128B

package tree; import java.io.*; import java.sql.*; import java.util.*; import javax.servlet.*; import javax.servlet.http.*; /** * 实现无限级分类目录树的Servlet * 完成数据库的连接 * 完成分类的查询，增加，删除等操作 * 编写日期：2007-10-05 * @author 何裕浩 * */ public class MySort extends HttpServlet{ public int Id; public String name; public int parentId; private Connection conn; private Statement stmt; public ResultSet rs; int level=0; PrintWriter out; /*覆盖doPost方法*/ public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{ String dsn=request.getParameter("dsn"); String user=request.getParameter("user"); String password=""; String sql=request.getParameter("sql"); request.setCharacterEncoding("gb2312"); response.setCharacterEncoding("gb2312"); out=response.getWriter(); OpenConn(dsn,user,password); //建立连接 show(sql,0); closeConn(); } //加载驱动程序，建立数据库的连接 public void OpenConn(String dsn,String user,String password){ try{ dsn = "jdbc:mysql:" + dsn; Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection(dsn,user,password); }catch(Exception e){ System.err.println("aq.executeQuery:"+e.getMessage()); } } //查询 public ResultSet executeQuery(String sql){ try{ stmt=null; rs=null; stmt=conn.createStatement(); rs=stmt.executeQuery(sql); }catch(SQLException e){ System.err.println("aq.executeQuery:"+e.getMessage()); } return rs; } //更新 public void executeUpdate(String sql){ try{ stmt=null; stmt=conn.createStatement(); stmt.executeUpdate(sql); }catch(SQLException e){ System.err.println("aq.executeUpdate:"+e.getMessage()); } } //用递归算法,获得某一个分类的等级,0为顶级分类 public int getLevel(String sql,int Id){ try{ String sql2=sql+" where Id="+Id; ResultSet result=executeQuery(sql2); while(result.next()){ parentId=result.getInt("parentId"); } }catch(SQLException e){ System.err.println("aq.executeUpdate:"+e.getMessage()); } while(parentId!=0){ level++; //level为全局变量,其他函数使用完后都应清零 getLevel(sql,parentId); ////递归 } return level; } //检测当前分类是否为最底层的分类 public boolean isLast(String sql,int Id){ boolean last=false; try{ String sql2=sql+" where parentId="+Id; ResultSet result=executeQuery(sql2); rs.next(); if(rs.getRow()==0) last=true; else last=false; }catch(SQLException e){ System.err.println("aq.executeUpdate:"+e.getMessage()); } return last; } //用递归算法，显示分类之间的父子关系 public void show(String sql,int parentId){ int printCount=0; String li=""; try{ String sql2=sql+" where parentId="+parentId; ResultSet result=executeQuery(sql2); while(result.next()){ Id=result.getInt("Id"); name=result.getString("name"); printCount=getLevel(sql,Id); out.print("<html>\n<body>"); for(int i=0;i<printCount;i++) out.print("   "); if(level==0) li="<img src=\"web/images/close.gif\"/>"; else if(isLast(sql,Id)) li="<img src=\"web/images/lastnodeline.gif\"/>"; else li="<img src=\"web/images/midopenedfolder.gif\"/>"; out.println(li+"<a href=\"show.jsp?Id="+Id+"\" target=\"main\">"+name+"</a><br>"); out.print("\n</body>\n</html>"); level=0; //level为全局变量,其他函数使用完后都应清零 show(sql,Id); //递归 } }catch(SQLException e){ System.err.println("aq.executeUpdate:"+e.getMessage()); } } //关闭连接 public void closeConn(){ try{ conn.close(); }catch(SQLException e){ System.err.println("aq.closeConn:"+e.getMessage()); } } /*覆盖doGet方法*/ public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{ doPost(request,response); } }

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