如下的內容內容是關于java從數據庫映射實體類的內容。

package com.share.barter.tool;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.Date;

public class GenEntity {

private static final String NAME = "root";private static final String PASS = "root";private static final String DRIVER ="com.mysql.jdbc.Driver";public GenEntity(){Connection con;PreparedStatement pStemt = null;try {try {Class.forName(DRIVER);} catch (ClassNotFoundException e1) {e1.printStackTrace();}con = DriverManager.getConnection(URL,NAME,PASS);pStemt = con.prepareStatement(sql);ResultSetMetaData rsmd = pStemt.getMetaData();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")){f_util = true;}if(colTypes[i].equalsIgnoreCase("image") || colTypes[i].equalsIgnoreCase("text")){f_sql = true;}colSizes[i] = rsmd.getColumnDisplaySize(i + 1);}String content = parse(colnames,colTypes,colSizes);try {File directory = new File("");String path=this.getClass().getResource("").getPath();System.out.println(path);System.out.println("src/?/"+path.substring(path.lastIndexOf("/com/", path.length())) );FileWriter fw = new FileWriter(directory.getAbsolutePath()+ "/src/"+path.substring(path.lastIndexOf("/com/", path.length()), path.length()) + initcap(tablename) + ".java");PrintWriter pw = new PrintWriter(fw);pw.println(content);pw.flush();pw.close();} catch (IOException e) {e.printStackTrace();}} catch (SQLException e) {e.printStackTrace();} finally{} }private String parse(String[] colnames, String[] colTypes, int[] colSizes) {StringBuffer sb = new StringBuffer();if(f_util){sb.append("import java.util.Date;rn");}if(f_sql){}sb.append("package com.share.barter.tool;rn");sb.append("rn");sb.append("rnrnpublic class " + initcap(tablename) + "{rn");sb.append("}rn");return sb.toString(); }private void processAllAttrs(StringBuffer sb) {for (int i = 0; i < colnames.length; i++) {sb.append("tprivate " + sqlType2JavaType(colTypes[i]) + " " + colnames[i] + ";rn");}}private void processAllMethod(StringBuffer sb) {for (int i = 0; i < colnames.length; i++) {sb.append("tpublic void set" + initcap(colnames[i]) + "(" + sqlType2JavaType(colTypes[i]) + " " + colnames[i] + "){rn");sb.append("tthis." + colnames[i] + "=" + colnames[i] + ";rn");sb.append("t}rn");sb.append("tpublic " + sqlType2JavaType(colTypes[i]) + " get" + initcap(colnames[i]) + "(){rn");sb.append("ttreturn " + colnames[i] + ";rn");sb.append("t}rn");}}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); }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")){return "Date";}else if(sqlType.equalsIgnoreCase("image")){return "Blod";}return null; }public static void main(String[] args) {new GenEntity();}

}

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