展開全部

那只e68a843231313335323631343130323136353331333335303530能創建一層的JTree?？import?java.sql.Connection;

import?java.sql.DriverManager;

import?java.sql.ResultSet;

import?java.sql.SQLException;

import?java.sql.Statement;

import?javax.swing.JFrame;

import?javax.swing.JTree;

import?javax.swing.tree.DefaultMutableTreeNode;

public?class?JTreeDemo2?extends?JFrame?{

private?Connection?con;

private?Statement?ste?=?null;

ResultSet?rs;

JTreeDemo2()?{

super("JTreeDemo");

this.setSize(200,?200);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

OpenDb();

DefaultMutableTreeNode?node?=?new?DefaultMutableTreeNode("所有表");

createNodes(node,?"0");

JTree?tree?=?new?JTree(node);

this.add(tree);

this.setVisible(true);

}

public?void?createNodes(DefaultMutableTreeNode?parent,?String?ParentID){

DefaultMutableTreeNode?temp?=?null;

String?strsql?=?"show?tables";

//?光標的相對位置

try{

rs?=?ste.executeQuery(strsql);

while?(rs.next()){

temp?=?new?DefaultMutableTreeNode(rs.getString(1));

parent.add(temp);

}

}?catch(Exception?e){

System.out.println(e);

}

}

//?連接數據庫

void?OpenDb(){

String?driver?=?"com.mysql.jdbc.Driver";

String?connection?=?"jdbc:mysql://localhost:3306/test";

//?數據庫用戶名

String?user?=?"root";

//?數據庫密碼

String?password?=?"root";

try?{

Class.forName(driver);

}catch?(ClassNotFoundException?e)?{

e.printStackTrace();

}

try{

con?=?DriverManager.getConnection(connection,?user,?password);

ste?=?con.createStatement();

}catch?(SQLException?e){

e.printStackTrace();

}

}

public?static?void?main(String[]?argv)?throws?Exception?{

new?JTreeDemo2();

}

}

總結

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