mysql 역방향 생 성 자바 실체 클래스

import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class GenEntityMysql {
    private static final GenEntityMysql INSTANCE = new GenEntityMysql();

    private String tableName;//   
    private String[] colNames; //     
    private String[] colTypes; //       
    private int[] colSizes; //       
    private boolean needUtil = false; //        java.util.*
    private boolean needSql = false; //        java.sql.*
    private static final SimpleDateFormat SDF = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    private static final String SQL = "SELECT * FROM ";//      

    // TODO        
    private static final String URL = "jdbc:mysql://localhost:3306/  ";
    private static final String NAME = "root";
    private static final String PASS = "12345678";
    private static final String DRIVER = "com.mysql.jdbc.Driver";
    private String packageOutPath = "com.zdz.entity";//             
    private String authorName = "zdz";//     
    private String[] generateTables = {"  "};//           ，       null

    /**
     *       
     */
    private GenEntityMysql() {
    }

    /**
     * @return
     * @description   class     
     * @author paul
     * @date 2017 8 18    5:30:07
     * @update 2017 8 18    5:30:07
     * @version V1.0
     */
    private String parse() {
        StringBuffer sb = new StringBuffer();
        sb.append("package " + packageOutPath + ";\r
");
        sb.append("\r
");
        //          
        if (needUtil) {
            sb.append("import java.util.Date;\r
");
        }
        if (needSql) {
            sb.append("import java.sql.*;\r
");
        }
        //     
        sb.append("/**\r
");
        sb.append(" * table name:  " + tableName + "\r
");
        sb.append(" * author name: " + authorName + "\r
");
        sb.append(" * create time: " + SDF.format(new Date()) + "\r
");
        sb.append(" */ \r
");
        //     
        sb.append("public class " + getTransStr(tableName, true) + "{\r
\r
");
        processAllAttrs(sb);//   
        sb.append("\r
");
        processAllMethod(sb);// get set  
        sb.append("}\r
");
        return sb.toString();
    }

    /**
     * @param sb
     * @description         
     * @author paul
     * @date 2017 8 18    5:15:04
     * @update 2017 8 18    5:15:04
     * @version V1.0
     */
    private void processAllAttrs(StringBuffer sb) {
        for (int i = 0; i < colNames.length; i++) {
            sb.append("\tprivate " + sqlType2JavaType(colTypes[i]) + " " + getTransStr(colNames[i], false) + ";\r
");
        }
    }

    /**
     * @param sb
     * @description     get/set  
     * @author paul
     * @date 2017 8 18    5:14:47
     * @update 2017 8 18    5:14:47
     * @version V1.0
     */
    private void processAllMethod(StringBuffer sb) {
        for (int i = 0; i < colNames.length; i++) {
            sb.append("\tpublic void set" + getTransStr(colNames[i], true) + "(" + sqlType2JavaType(colTypes[i]) + " "
                    + getTransStr(colNames[i], false) + "){\r
");
            sb.append("\t\tthis." + getTransStr(colNames[i], false) + "=" + getTransStr(colNames[i], false) + ";\r
");
            sb.append("\t}\r
");
            sb.append("\tpublic " + sqlType2JavaType(colTypes[i]) + " get" + getTransStr(colNames[i], true) + "(){\r
");
            sb.append("\t\treturn " + getTransStr(colNames[i], false) + ";\r
");
            sb.append("\t}\r
");
        }
    }

    /**
     * @param str      
     * @return
     * @description               
     * @author paul
     * @date 2017 8 18    5:12:12
     * @update 2017 8 18    5:12:12
     * @version V1.0
     */
    private String initCap(String str) {
        char[] ch = str.toCharArray();
        if (ch[0] >= 'a' && ch[0] <= 'z')
            ch[0] = (char) (ch[0] - 32);
        return new String(ch);
    }

    /**
     * @return
     * @description  mysql              
     * @author paul
     * @date 2017 8 18    4:55:07
     * @update 2017 8 18    4:55:07
     * @version V1.0
     */
    private String getTransStr(String before, boolean firstChar2Upper) {
        //  "_"    ,           
        if (!before.contains("_"))
            return firstChar2Upper ? initCap(before) : before;
        String[] strs = before.split("_");
        StringBuffer after = null;
        if (firstChar2Upper) {
            after = new StringBuffer(initCap(strs[0]));
        } else {
            after = new StringBuffer(strs[0]);
        }
        if (strs.length > 1) {
            for (int i=1; i)
                after.append(initCap(strs[i]));
        }
        return after.toString();
    }

    /**
     * @return
     * @description   sql        Java  
     * @author paul
     * @date 2017 8 18    4:55:41
     * @update 2017 8 18    4:55:41
     * @version V1.0
     */
    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 "Integer";
        } else if (sqlType.equalsIgnoreCase("bigint")) {
            return "Long";
        } else if (sqlType.equalsIgnoreCase("float")) {
            return "float";
        } else if (sqlType.equalsIgnoreCase("decimal")) {
            return "BigDecimal";
        } else if (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")) {
            return "Date";
        } else if (sqlType.equalsIgnoreCase("image")) {
            return "Blod";
        }
        return null;
    }

    /**
     *
     * @description     
     * @author paul
     * @date 2017 8 18    2:04:20
     * @update 2017 8 18    2:04:20
     * @version V1.0
     * @throws Exception
     */
    private void generate() throws Exception {
        //       
        Connection con;
        PreparedStatement pStemt = null;
        Class.forName(DRIVER);
        con = DriverManager.getConnection(URL, NAME, PASS);
        System.out.println("connect database success...");
        //         
        DatabaseMetaData db = con.getMetaData();
        //        ，          ，       
        List tableNames = new ArrayList<>();
        if (generateTables == null) {
            //             
            ResultSet rs = db.getTables(null, null, null, new String[] { "TABLE" });
            while (rs.next()) tableNames.add(rs.getString(3));
        } else {
            for (String tableName : generateTables) tableNames.add(tableName);
        }
        String tableSql;
        PrintWriter pw = null;
        for (int j = 0; j < tableNames.size(); j++) {
            tableName = tableNames.get(j);
            tableSql = SQL + tableName;
            pStemt = con.prepareStatement(tableSql);
            ResultSetMetaData rsmd = pStemt.getMetaData();
            int size = rsmd.getColumnCount();
            colNames = new String[size];
            colTypes = new String[size];
            colSizes = new int[size];
            //       
            for (int i = 0; i < size; i++) {
                colNames[i] = rsmd.getColumnName(i + 1);
                colTypes[i] = rsmd.getColumnTypeName(i + 1);
                if (colTypes[i].equalsIgnoreCase("datetime"))
                    needUtil = true;
                if (colTypes[i].equalsIgnoreCase("image") || colTypes[i].equalsIgnoreCase("text"))
                    needSql = true;
                colSizes[i] = rsmd.getColumnDisplaySize(i + 1);
            }
            //    class     
            String content = parse();
            //      
            File directory = new File("");
            String dirName = directory.getAbsolutePath() + "/src/main/java/" + packageOutPath.replace(".", "/");
            File dir = new File(dirName);
            if (!dir.exists() && dir.mkdirs()) System.out.println("generate dir 【" + dirName + "】");
            String javaPath = dirName + "/" + getTransStr(tableName, true) + ".java";
            FileWriter fw = new FileWriter(javaPath);
            pw = new PrintWriter(fw);
            pw.println(content);
            pw.flush();
            System.out.println("create class 【" + tableName + "】");
        }
        if (pw != null)
            pw.close();
    }

    /**
     * @param args
     * @description     
     * @author paul
     * @date 2017 8 18    2:03:35
     * @update 2017 8 18    2:03:35
     * @version V1.0
     */
    public static void main(String[] args) {
        try {
            INSTANCE.generate();
            System.out.println("generate classes success!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}