最近做系統老做一些相同的工作，就想寫一自動生成程式碼的工具類來方便以後的開法，我從網上整理修改了一些方法感覺還不錯，接下來我還陸續跟新一些

自動生成程式碼的工具類，希望對大家有用。覺得不好輕點噴。

import java.io.BufferedWriter;  
import java.io.File;  
import java.io.FileWriter;  
import java.io.IOException;  
import java.sql.Connection;  
import java.sql.DriverManager;  
import java.sql.PreparedStatement;  
import java.sql.ResultSet;  
import java.sql.ResultSetMetaData;  
import java.sql.SQLException;  
import java.util.Vector;  
  
public class reflectBean {  
    private Connection connection;  
    private PreparedStatement UserQuery;  
    /*mysql url的連線字串*/  
    private static String url = "jdbc:mysql://127.0.0.1:3306/wechat?useUnicode=true&characterEncoding=UTF-8";  
    //賬號  
    private static String user = "root";  
    //密碼  
    private static String password = "123456";  
    private Vector<String> vector = new Vector<String>();  
    //mysql jdbc的java包驅動字串  
    private String driverClassName = "com.mysql.jdbc.Driver";  
    //資料庫中的表名  
    String table = "orderList";  
    //資料庫的列名稱  
    private String[] colnames; // 列名陣列  
    //列名型別陣列    
    private String[] colTypes;  
    public reflectBean(){  
        try {//驅動註冊  
            Class.forName(driverClassName);  
            if (connection == null || connection.isClosed())  
                //獲得連結  
                connection = DriverManager.getConnection(url, user, password);  
        } catch (ClassNotFoundException ex) {  
                ex.printStackTrace();  
                System.out.println("Oh,not");  
            } catch (SQLException e) {  
                e.printStackTrace();  
                System.out.println("Oh,not");  
            }  
    }  
      
    public Connection getConnection() {  
        return connection;  
    }  
    public void setConnection(Connection connection) {  
        this.connection = connection;  
    }  
  
    public void doAction(){  
        String sql = "select * from "+table;  
        try {  
            PreparedStatement statement = connection.prepareStatement(sql);  
            //獲取資料庫的元資料   
            ResultSetMetaData metadata = statement.getMetaData();  
            //資料庫的欄位個數  
            int len = metadata.getColumnCount();  
            //欄位名稱  
            colnames = new String[len+1];  
            //欄位型別 --->已經轉化為java中的類名稱了  
            colTypes = new String[len+1];  
            for(int i= 1;i<=len;i++){  
                //System.out.println(metadata.getColumnName(i)+":"+metadata.getColumnTypeName(i)+":"+sqlType2JavaType(metadata.getColumnTypeName(i).toLowerCase())+":"+metadata.getColumnDisplaySize(i));  
                //metadata.getColumnDisplaySize(i);  
                colnames[i] = metadata.getColumnName(i); //獲取欄位名稱  
                System.out.println(colnames[i]);
                colTypes[i] = sqlType2JavaType(metadata.getColumnTypeName(i)); //獲取欄位型別   
                System.out.println(metadata.getColumnTypeName(i));
                System.out.println(colTypes[i]);
            }  
        } catch (SQLException e) {  
            e.printStackTrace();  
        }  
    }  
    /* 
     * mysql的欄位型別轉化為java的型別*/  
    private String sqlType2JavaType(String sqlType) {    
          
        if(sqlType.equalsIgnoreCase("bit")){    
            return "boolean";    
        }else if(sqlType.equalsIgnoreCase("tinyint")){    
            return "byte";    
        }else if(sqlType.equalsIgnoreCase("smallint")){    
            return "short";    
        }else if(sqlType.equalsIgnoreCase("int")){    
            return "int";    
        }else if(sqlType.equalsIgnoreCase("bigint")){    
            return "long";    
        }else if(sqlType.equalsIgnoreCase("float")){    
            return "float";    
        }else if(sqlType.equalsIgnoreCase("decimal") || sqlType.equalsIgnoreCase("numeric")     
                || sqlType.equalsIgnoreCase("real") || sqlType.equalsIgnoreCase("money")     
                || sqlType.equalsIgnoreCase("smallmoney")){    
            return "double";    
        }else if(sqlType.equalsIgnoreCase("varchar") || sqlType.equalsIgnoreCase("char")     
                || sqlType.equalsIgnoreCase("nvarchar") || sqlType.equalsIgnoreCase("nchar")     
                || sqlType.equalsIgnoreCase("text")){    
            return "String";    
        }else if(sqlType.equalsIgnoreCase("datetime") ||sqlType.equalsIgnoreCase("date")){    
            return "Date";    
        }else if(sqlType.equalsIgnoreCase("image")){    
            return "Blod";    
        }else if(sqlType.equalsIgnoreCase("timestamp")){    
            return "Timestamp";    
        }    
            
        return null;    
    }  
    /*獲取整個類的字串並且輸出為java檔案 
     * */  
    public  StringBuffer getClassStr(){  
        //輸出的類字串  
        StringBuffer str = new StringBuffer("");  
        //獲取表型別和表名的欄位名  
        this.doAction();  
        //校驗  
        if(null == colnames && null == colTypes) return null;  
        //拼接  
        str.append("public class "+GetTuoFeng(table)+" {\r\n");  
        //拼接屬性  
        for(int index=1; index < colnames.length ; index++){  
            str.append(getAttrbuteString(colnames[index],colTypes[index]));  
        }  
        //拼接get，Set方法         
        for(int index=1; index < colnames.length ; index++){  
            str.append(getGetMethodString(colnames[index],colTypes[index]));  
            str.append(getSetMethodString(colnames[index],colTypes[index]));  
        }  
        str.append("}\r\n");  
        //輸出到檔案中  
        File file = new File("E:/mengwx/【原始碼】mysql版本_spring4.0/FHMYSQL/src/com/fh/entity/"+GetTuoFeng(table)+".java");  
        BufferedWriter write = null;  
  
        try {  
            write = new BufferedWriter(new FileWriter(file));  
            write.write(str.toString());  
            write.close();  
        } catch (IOException e) {  
  
            e.printStackTrace();  
            if (write != null)  
                try {  
                    write.close();  
                } catch (IOException e1) {            
                    e1.printStackTrace();  
                }  
        }  
        return str;  
    }  
    /* 
     * 獲取欄位字串*/  
    public StringBuffer getAttrbuteString(String name, String type) {  
        if(!check(name,type)) {  
            System.out.println("類中有屬性或者型別為空");  
            return null;  
        };  
        String format = String.format("    private %s %s;\n\r", new String[]{type,name});  
        return new StringBuffer(format);  
    }  
    /* 
     * 校驗name和type是否合法*/  
    public boolean check(String name, String type) {  
        if("".equals(name) || name == null || name.trim().length() ==0){  
            return false;  
        }  
        if("".equals(type) || type == null || type.trim().length() ==0){  
            return false;  
        }  
        return true;  
          
    }  
    /* 
     * 獲取get方法字串*/  
    private StringBuffer getGetMethodString(String name, String type) {  
        if(!check(name,type)) {  
            System.out.println("類中有屬性或者型別為空");  
            return null;  
        };  
        String Methodname = "get"+GetTuoFeng(name);  
        String format = String.format("    public %s %s(){\n\r", new Object[]{type,Methodname});  
        format += String.format("        return this.%s;\r\n", new Object[]{name});  
        format += "    }\r\n";  
        return new StringBuffer(format);  
    }  
    //將名稱首字元大寫  
    private String GetTuoFeng(String name) {  
        name = name.trim();  
        if(name.length() > 1){  
            name = name.substring(0, 1).toUpperCase()+name.substring(1);  
        }else  
        {  
            name = name.toUpperCase();  
        }  
        return name;  
    }  
    /* 
     * 獲取欄位的get方法字串*/  
    private Object getSetMethodString(String name, String type) {  
        if(!check(name,type)) {  
            System.out.println("類中有屬性或者型別為空");  
            return null;  
        };  
        String Methodname = "set"+GetTuoFeng(name);  
        String format = String.format("    public void %s(%s %s){\n\r", new Object[]{Methodname,type,name});  
        format += String.format("        this.%s = %s;\r\n", new Object[]{name,name});  
        format += "    }\r\n";  
        return new StringBuffer(format);  
    }  
  
    public static void main(String[] args) {  
        reflectBean bean = new reflectBean();  
        System.err.println(bean.getClassStr());  
    }  
      
}