直接上代码：
数据库链接工具类：
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
//本类专门用来连接数据库,可以作为固定的工具类使用(记下来即可)
public class DBManager {
// 定义一个静态的连接对象用来连接数据库
// private static Connection cOnn= null;
// 定一个静态的语句对象,用来执行sql语句
// private static Statement stmt = null;
// 定义一个静态的结果集对象用来存放执行sql语句后查询得到的结果
// private static ResultSet rs = null;
/**
* 连接数据库的方法
*
* @return conn 返回一个连接对象
*/
public static Connection mssql(String url, String user, String pass) {
Connection cOnn= null;
try {
// 1、加载连接驱动
// "jdbc:odbc:bookdemo"
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
// 2、连接到数据库（获得连接对象）
// 通过连接管理器(DriverManager)类的一个方法来获得连接对象，里面的参数表示我们连接到数据源bookdemo
cOnn= DriverManager.getConnection(url, user, pass);
} catch (ClassNotFoundException e) {
// 以堆栈的方式将错误信息打印出来
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn; // 将连接对象返回
}
/**
* 连接数据库的方法
*
* @return conn 返回一个连接对象
* @throws ClassNotFoundException
* @throws SQLException
*/
public static Connection mysql(String url, String user, String pass)
throws ClassNotFoundException, SQLException {
Connection cOnn= null;
// 1、加载连接驱动
// "jdbc:odbc:bookdemo"
Class.forName("com.mysql.jdbc.Driver");
// 2、连接到数据库（获得连接对象）
// 通过连接管理器(DriverManager)类的一个方法来获得连接对象，里面的参数表示我们连接到数据源bookdemo
cOnn= DriverManager.getConnection(url, user, pass);
return conn; // 将连接对象返回
}
/**
* 动漫网的mysql数据库连接
* @throws SQLException
* @throws ClassNotFoundException
*/
public static Connection mysql(String host, String database, String user,
String pass) throws ClassNotFoundException, SQLException {
String url = "jdbc:mysql://" + host + "/" + database
+ "?useUnicode=true&characterEncoding=UTF-8";
return mysql(url, user, pass);
}
/**
* 本函数用来执行用户传入的sql语句(仅限于select语句)
*
* @param sql
* 传入的sql语句，等待执行
* @return 返回执行sql语句后的结果集对象
*/
public static ResultSet query(Connection conn, String sql) {
ResultSet rs = null;
try {
// 3、通过连接对象创建一个语句对象stmt，用来执行sql语句
Statement stmt = conn.createStatement();
// 4、执行sql语句，得到一个rs（结果集对象）
rs = stmt.executeQuery(sql);
} catch (Exception e) { // 错误处理，暂时不用理会
e.printStackTrace();
}
return rs; // 将查询得到的结果集对象返回
}
/**
* 本方法用来执行更新语句，并返回影响了多少行（insert,update,delete）
*
* @param sql
* 传入的sql语句，等待执行
* @return 返回执行sql语句后的结果集对象
*/
public static int update(Connection conn, String sql) {
// 执行sql语句前先连接到数据库
Statement stmt = null;
int i = 0;
try {
// 通过连接对象创建一个语句对象stmt，用来执行sql语句
stmt = conn.createStatement();
// 执行更新语句，并返回影响了多少行
i = stmt.executeUpdate(sql);
} catch (Exception e) { // 错误处理，暂时不用理会
e.printStackTrace();
} finally {
try {
stmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return i;
}
public static void close(Connection conn, Statement stmt, ResultSet rs) {
try {
if (rs != null) {
rs.close();
rs = null;
}
if (stmt != null) {
stmt.close();
stmt = null;
}
if (conn != null) {
conn.close();
cOnn= null;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
/**
* 此类用来将mysql的表直接生成Bean
*
* @author Ming
*/
public class MySQLToBean extends JFrame {
/**
*
*/
private static final long serialVersiOnUID= 1L;
private JCheckBox checkBox;
Properties p = new Properties();
String cOnfigFile= "config.ini";
private JLabel lblNewLabel_4;
public MySQLToBean() {
setResizable(false);
setTitle("MySQL生成javabean小工具");
setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
setBounds(100, 100, 484, 324);
JPanel panel = new JPanel();
getContentPane().add(panel, BorderLayout.CENTER);
panel.setLayout(null);
txtLocalhost = new JTextField();
txtLocalhost.setText("localhost");
txtLocalhost.setBounds(146, 10, 147, 21);
panel.add(txtLocalhost);
txtLocalhost.setColumns(10);
JLabel lblIp = new JLabel("IP:");
lblIp.setBounds(80, 13, 30, 15);
panel.add(lblIp);
JLabel label = new JLabel("数据库:");
label.setBounds(80, 42, 54, 15);
panel.add(label);
textField = new JTextField();
textField.setBounds(146, 39, 147, 21);
panel.add(textField);
textField.setColumns(10);
JLabel label_1 = new JLabel("表名:");
label_1.setBounds(80, 127, 54, 15);
panel.add(label_1);
textField_1 = new JTextField();
textField_1.setBounds(146, 124, 147, 21);
panel.add(textField_1);
textField_1.setColumns(10);
JLabel label_2 = new JLabel("包名:");
label_2.setBounds(79, 156, 54, 15);
panel.add(label_2);
txtComyourcom = new JTextField();
txtComyourcom.setText("com.yourcom.bean");
txtComyourcom.setBounds(146, 155, 147, 21);
panel.add(txtComyourcom);
txtComyourcom.setColumns(10);
JLabel lblNewLabel = new JLabel("输出目录：");
lblNewLabel.setBounds(80, 190, 65, 15);
panel.add(lblNewLabel);
textField_3 = new JTextField();
textField_3.setBounds(146, 186, 147, 21);
panel.add(textField_3);
textField_3.setColumns(10);
checkBox = new JCheckBox("生成包结构目录");
checkBox.setSelected(true);
checkBox.setBounds(145, 213, 147, 23);
panel.add(checkBox);
JLabel lblNewLabel_1 = new JLabel("可以指定表名，也可以不指定");
lblNewLabel_1.setBounds(303, 127, 176, 15);
panel.add(lblNewLabel_1);
JLabel lblNewLabel_2 = new JLabel("* 数据库名");
lblNewLabel_2.setForeground(Color.RED);
lblNewLabel_2.setBounds(303, 42, 66, 15);
panel.add(lblNewLabel_2);
JLabel lblNewLabel_3 = new JLabel("* 包结构");
lblNewLabel_3.setForeground(Color.RED);
lblNewLabel_3.setBounds(303, 158, 79, 15);
panel.add(lblNewLabel_3);
JButton button = new JButton("执行");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
go();
}
});
button.setBounds(145, 242, 93, 23);
panel.add(button);
textField_4 = new JTextField();
textField_4.setText("123456");
textField_4.setBounds(145, 93, 147, 21);
panel.add(textField_4);
textField_4.setColumns(10);
txtRoot = new JTextField();
txtRoot.setText("root");
txtRoot.setBounds(145, 66, 148, 21);
panel.add(txtRoot);
txtRoot.setColumns(10);
JLabel label_3 = new JLabel("用户名:");
label_3.setBounds(80, 69, 54, 15);
panel.add(label_3);
JLabel label_4 = new JLabel("密码:");
label_4.setBounds(80, 96, 54, 15);
panel.add(label_4);
lblNewLabel_4 = new JLabel("");
lblNewLabel_4.setForeground(Color.RED);
lblNewLabel_4.setBounds(248, 242, 204, 23);
panel.add(lblNewLabel_4);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
super.windowClosing(e);
export();
System.exit(0);
}
});
inport();
}
static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
private JTextField txtLocalhost;
private JTextField textField;
private JTextField textField_1;
private JTextField txtComyourcom;
private JTextField textField_3;
private JTextField textField_4;
private JTextField txtRoot;
/**
* @param args
*/
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (UnsupportedLookAndFeelException e) {
e.printStackTrace();
}
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MySQLToBean frame = new MySQLToBean();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
private void inport() {
File cOnfig= new File(configFile);
if (config.exists()) {
try {
InputStream is = new FileInputStream(config);
p.load(is);
is.close();
setUIVal();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
try {
config.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void setUIVal() {
txtLocalhost.setText(p.getProperty("host", "localhost"));
textField.setText(p.getProperty("database", ""));
txtRoot.setText(p.getProperty("user", "root"));
textField_4.setText(p.getProperty("pass", "123456"));
txtComyourcom.setText(p.getProperty("packname", "com.youcom.bean"));
textField_3.setText(p.getProperty("dirstr", ""));
textField_1.setText(p.getProperty("tablename", ""));
}
private void export() {
String host = txtLocalhost.getText();
String database = textField.getText();
String user = txtRoot.getText();
String pass = textField_4.getText();
String packname = txtComyourcom.getText();
String dirstr = textField_3.getText();// 空表示当前目录
String tablename = textField_1.getText();
p.setProperty("host", host);
p.setProperty("database", database);
p.setProperty("user", user);
p.setProperty("pass", pass);
p.setProperty("packname", packname);
p.setProperty("dirstr", dirstr);
p.setProperty("tablename", tablename);
try {
OutputStream out = new FileOutputStream(configFile);
p.store(out, "退出保存文件," + sdf.format(new Date()));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void setTips(String msg) {
lblNewLabel_4.setText(msg);
}
public void go() {
String host = txtLocalhost.getText();
String database = textField.getText();
if (database.length() == 0) {
setTips("数据库名必填");
return;
}
String user = txtRoot.getText();
String pass = textField_4.getText();
String packname = txtComyourcom.getText();
String dirstr = textField_3.getText();// 空表示当前目录
String tablename = textField_1.getText();
boolean createPackage = checkBox.getSelectedObjects() != null;
System.out.println(createPackage);
if (dirstr != null && !dirstr.isEmpty()) {
if (!dirstr.endsWith("/")) {
dirstr += "/";
}
}
File dir = new File(dirstr);
if (createPackage) {
dir = new File(dirstr + packname.replaceAll("\\.", "/"));
if (!dir.exists()) {
dir.mkdirs();
}
}
String outputdir = dir.getAbsolutePath();// bean的生成目录
Connection cOnn= null;
try {
cOnn= DBManager.mysql(host, database, user, pass);
if (tablename.length() > 0) {
parseTableByShowCreate(conn, tablename, packname, outputdir);
} else {
parseAllTable(conn, packname, outputdir);
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
setTips("找不到MySQL的jar包");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 开始处理生成所有表 如果不传入表名，表示将数据库中所有表生成bean; 可以指定表名生成bean;
*/
public void parseAllTable(Connection conn, String packname, String outputdir) {
String sql = "show tables";
ResultSet rs = DBManager.query(conn, sql);
try {
while (rs.next()) {
String tablename = rs.getString(1);
parseTableByShowCreate(conn, tablename, packname, outputdir);
}
DBManager.close(conn, null, rs);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 通过 mysql的 show create table TABLE_NAME逆向生成Bean;
*
* @param conn
* @param tname
* @param outputdir
* @param packname
*/
private void parseTableByShowCreate(Connection conn, String tablename,
String packname, String outputdir) {
StringBuilder classInfo = new StringBuilder("\t/**\r\n\t*");
boolean shouldCloseCOnn= false;
String sql = "desc " + tablename;
ResultSet rs = null;
try {
rs = DBManager.query(conn, sql);
StringBuilder fields = new StringBuilder();
StringBuilder methods = new StringBuilder();
int i = 0;
while (rs.next()) {
String fieldName = rs.getString("Field");
System.out.println(rs.getString("Type"));
String fieldType = "";
if (rs.getString("Type").contains("(")) {
fieldType = typeTrans(rs.getString("Type").substring(0,
rs.getString("Type").indexOf("(")));
} else {
fieldType = typeTrans(rs.getString("Type"));
}
fields.append(getFieldStr(fieldName, fieldType, null));
methods.append(getMethodStr(fieldName, fieldType));
if (i == 0) {
classInfo.append("此类由" + getClass().getSimpleName()
+ "工具自动生成\r\n");
classInfo.append("\r\n");
classInfo.append("\t*@author \r\n");
classInfo.append("\t*@since ");
classInfo.append(sdf.format(new Date()));
classInfo.append("\r\n\t*/\r\n\r\n");
}
i++;
}
classInfo.append("\tpublic class ")
.append(upperFirestChar(tablename)).append("{\r\n");
classInfo.append(fields);
classInfo.append(methods);
classInfo.append("\r\n");
classInfo.append("}");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
DBManager.close(shouldCloseConn ? conn : null, null, rs);
}
String packageinfo = "package " + packname.replace("src.", "")
+ ";\r\n\r\n";
File file = new File(outputdir, upperFirestChar(tablename) + ".java");
System.out.println(file.getAbsolutePath());
try {
FileWriter fw = new FileWriter(file);
fw.write(packageinfo);
fw.write(classInfo.toString());
fw.flush();
fw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
*
* @param type
* @return
*/
private String getMethodStr(String field, String type) {
StringBuilder get = new StringBuilder("\tpublic ");
get.append(type).append(" ");
if (type.equals("boolean")) {
get.append(field);
} else {
get.append("get");
get.append(upperFirestChar(field));
}
get.append("(){").append("\r\n\t\treturn this.").append(field)
.append(";\r\n\t}\r\n");
StringBuilder set = new StringBuilder("\tpublic void ");
if (type.equals("boolean")) {
set.append(field);
} else {
set.append("set");
set.append(upperFirestChar(field));
}
set.append("(").append(type).append(" ").append(field)
.append("){\r\n\t\tthis.").append(field).append("=")
.append(field).append(";\r\n\t}\r\n");
get.append(set);
return get.toString();
}
public String upperFirestChar(String src) {
return src.substring(0, 1).toUpperCase().concat(src.substring(1));
}
private String getFieldStr(String field, String type, String cmt) {
StringBuilder sb = new StringBuilder();
sb.append("\t").append("private ").append(type).append(" ")
.append(field).append(";");
if (cmt != null) {
sb.append("//").append(cmt);
}
sb.append("\r\n");
return sb.toString();
}
/**
* mysql的类型转换到java 类型参考文章
*
*/
public String typeTrans(String type) {
if (type.contains("tinyint")) {
return "boolean";
} else if (type.contains("int")) {
return "int";
} else if (type.contains("varchar") || type.contains("date")
|| type.contains("time") || type.contains("datetime")
|| type.contains("timestamp") || type.contains("text")
|| type.contains("enum") || type.contains("set")) {
return "String";
} else if (type.contains("binary") || type.contains("blob")) {
return "byte[]";
} else {
return "String";
}
}
}Mysql自动生成javabean
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