package fanshe; import java.io.File; import java.io.FileWriter; import java.io.IOException; 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.util.ArrayList; import java.util.List; /** * 根据数据库表结构 自动生成java Bean * * @author DLHT 2016年3月4日下午5:00:28 AutoCreateClass.java DLHT */ public class AutoCreateBean { // mysql 驱动类 private static final String DRIVER = "com.mysql.jdbc.Driver"; // 数据库登录用户名 private static final String USER = "root"; // 数据库登录密码 private static final String PASSWORD = "20110725"; // 数据库连接地址 private static final String URL = "jdbc:mysql://localhost:3306/networkflow"; private static String tablename; private String[] colnames; // 列名数组 private String[] colTypes; // 列名类型数组 private int[] colSizes; // 列名大小数组 private boolean f_util = false; // 是否需要导入包java.util.* private boolean f_sql = false; // 是否需要导入包java.sql.* /** * 获取指定数据库中包含的表 TBlist * * @time 2016年3月4日下午5:54:52 * @packageName com.util * @return 返回所有表名(将表名放到一个集合中) * @throws Exception */ public List<String> TBlist() throws Exception { // 访问数据库 采用 JDBC方式 Class.forName(DRIVER); Connection con = DriverManager.getConnection(URL, USER, PASSWORD); DatabaseMetaData md = con.getMetaData(); List<String> list = null; ResultSet rs = md.getTables(null, null, null, null); if (rs != null) { list = new ArrayList<String>(); } while (rs.next()) { // System.out.println("|表" + (i++) + ":" + rs.getString("TABLE_NAME")); String tableName = rs.getString("TABLE_NAME"); list.add(tableName); } rs = null; md = null; con = null; return list; } public void GenEntity(List<String> TBlist, String packageName)throws Exception { Connection conn = null; PreparedStatement pstmt = null; ResultSetMetaData rsmd = null; // 访问数据库 采用 JDBC方式 Class.forName(DRIVER); conn = DriverManager.getConnection(URL, USER, PASSWORD); for (int k = 0; k < TBlist.size(); k++) { tablename = TBlist.get(k); String strsql = "select * from " + tablename; pstmt = conn.prepareStatement(strsql); rsmd = pstmt.getMetaData(); int size = rsmd.getColumnCount(); // 共有多少列 colnames = new String[size]; colTypes = new String[size]; colSizes = new int[size]; for (int i = 0; i < rsmd.getColumnCount(); 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); } markerBean(initcap(tablename), parse(), packageName); } pstmt = null; rsmd = null; conn = null; } /** * 解析处理(生成实体类主体代码) */ private String parse() { StringBuffer sb = new StringBuffer(); if (f_util) { sb.append("import java.util.Date; "); } if (f_sql) { sb.append("import java.sql.*; "); } sb.append("public class " + initcap(tablename) + " { "); processAllAttrs(sb); processAllMethod(sb); sb.append("} "); return sb.toString(); } /** * 创建java 文件 将生成的属性 get/set 方法 保存到 文件中 markerBean * * @time 2015年9月29日下午4:15:22 * @packageName fanshe * @param className * 类名称 * @param content * 类内容 包括属性 getset 方法 */ public void markerBean(String className, String content, String packageName) { String folder = System.getProperty("user.dir") + "/src/" + packageName + "/"; File file = new File(folder); if (!file.exists()) { file.mkdirs(); } String fileName = folder + className + ".java"; try { File newdao = new File(fileName); FileWriter fw = new FileWriter(newdao); fw.write("package " + packageName.replace("/", ".") + "; "); fw.write(content); fw.flush(); fw.close(); } catch (IOException e) { e.printStackTrace(); } } /** * 生成所有的方法 * * @param sb */ private void processAllMethod(StringBuffer sb) { for (int i = 0; i < colnames.length; i++) { sb.append(" public void set" + initcap(colnames[i]) + "(" + sqlType2JavaType(colTypes[i]) + " " + colnames[i] + "){ "); sb.append(" this." + colnames[i] + " = " + colnames[i] + "; "); sb.append(" } "); sb.append(" public " + sqlType2JavaType(colTypes[i]) + " get" + initcap(colnames[i]) + "(){ "); sb.append(" return " + colnames[i] + "; "); sb.append(" } "); } } /** * 解析输出属性 * * @return */ private void processAllAttrs(StringBuffer sb) { for (int i = 0; i < colnames.length; i++) { sb.append(" private " + sqlType2JavaType(colTypes[i]) + " " + colnames[i] + "; "); } } /** * 把输入字符串的首字母改成大写 * * @param str * @return */ 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 "bool"; } 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")) { return "double"; } else if (sqlType.equalsIgnoreCase("money") || sqlType.equalsIgnoreCase("smallmoney")) { return "double"; } else if (sqlType.equalsIgnoreCase("varchar") || sqlType.equalsIgnoreCase("char") || sqlType.equalsIgnoreCase("nvarchar") || sqlType.equalsIgnoreCase("nchar")) { return "String"; } else if (sqlType.equalsIgnoreCase("datetime") ||sqlType.equalsIgnoreCase("date")){ return "Date"; } else if (sqlType.equalsIgnoreCase("image")) { return "Blob"; } else if (sqlType.equalsIgnoreCase("text")) { return "Clob"; } return null; } public static void main(String[] args) throws Exception { AutoCreateBean auto = new AutoCreateBean(); List<String> list = auto.TBlist(); auto.GenEntity(list, "com/bean"); } }