根据数据库表结构生成java类

 import java.io.File;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.sql.Connection;
 import java.sql.DatabaseMetaData;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.ResultSetMetaData;
 import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.List;

 import android.ConnectionFactory;

 /**
  * 根据数据库表 生成java 实体类
  *
  * @author DLHT
  * @time 2015年9月29日下午4:13:42
  * @className GenEntityTool.java
  */
 public class GenEntityTool {
     private String tablename = "test";

     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.*

     public GenEntityTool() {

         getTablesName();

         Connection conn = null;
         PreparedStatement pstmt = null;
         ResultSetMetaData rsmd = null;

         conn = ConnectionFactory.getInstance().getConnection();
         String strsql = "select * from " + tablename;
         try {
             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);
             }
             String content = parse(colnames, colTypes, colSizes);

             try {
                 FileWriter fw = new FileWriter(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 {
             ConnectionFactory.getInstance().closeConnection(conn, pstmt, null);
             rsmd = null;
         }
     }

     /**
      *    获取当前数据中的表名称
      * @methodName getTablesName
      * @time 2015年9月29日下午4:52:26
      * @packageName fanshe
      */
     public List<String> getTablesName(){
         List<String> list = null;
         Connection conn = null;
         DatabaseMetaData md = null;
         ResultSet rs = null;
         conn = ConnectionFactory.getInstance().getConnection();
         try {
             md = conn.getMetaData();
             rs = md.getTables(null, null, null, null);
             if(rs!=null&&rs.next()){
                 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);
             }

         } catch (SQLException e) {
             e.printStackTrace();
         } finally {
             ConnectionFactory.getInstance().closeConnection(conn, null, rs);
             md = null;
         }
         return list;
     }

     /**
      * 解析处理(生成实体类主体代码)
      */
     private String parse(String[] colNames, String[] colTypes, int[] colSizes) {
         StringBuffer sb = new StringBuffer();
         if (f_util) {
             sb.append("import java.util.Date;\r\n");
         }
         if (f_sql) {
             sb.append("import java.sql.*;\r\n\r\n\r\n");
         }
         sb.append("public class " + initcap(tablename) + " {\r\n");
         processAllAttrs(sb);
         processAllMethod(sb);
         sb.append("}\r\n");

         //markerBean(initcap(tablename), sb.toString());

         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 folder = System.getProperty("user.dir") + "/src/fanshe/";

         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(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("\tpublic void set" + initcap(colnames[i]) + "("
                     + sqlType2JavaType(colTypes[i]) + " " + colnames[i]
                     + "){\r\n");
             sb.append("\t\tthis." + colnames[i] + "=" + colnames[i] + ";\r\n");
             sb.append("\t}\r\n");

             sb.append("\tpublic " + sqlType2JavaType(colTypes[i]) + " get"
                     + initcap(colnames[i]) + "(){\r\n");
             sb.append("\t\treturn " + colnames[i] + ";\r\n");
             sb.append("\t}\r\n");
         }
     }

     /**
      * 解析输出属性
      *
      * @return
      */
     private void processAllAttrs(StringBuffer sb) {
         for (int i = 0; i < colnames.length; i++) {
             sb.append("\tprivate " + sqlType2JavaType(colTypes[i]) + " "
                     + colnames[i] + ";\r\n");

         }
     }

     /**
      * 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")) {
             return "Date";
         }

         else if (sqlType.equalsIgnoreCase("image")) {
             return "Blob";
         } else if (sqlType.equalsIgnoreCase("text")) {
             return "Clob";
         }
         return null;
     }

     public static void main(String[] args) {
         new GenEntityTool();
     }
 }

获取当前数据库中 所有的表

     /**
      *    获取当前数据中的表名称
      * @methodName getTablesName
      * @time 2015年9月29日下午4:52:26
      * @packageName fanshe
      */
     public List<String> getTablesName(){
         List<String> list = null;
         Connection conn = null;
         DatabaseMetaData md = null;
         ResultSet rs = null;
         conn = ConnectionFactory.getInstance().getConnection();
         try {
             md = conn.getMetaData();
             rs = md.getTables(null, null, null, null);
             if(rs!=null&&rs.next()){
                 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);
             }

         } catch (SQLException e) {
             e.printStackTrace();
         } finally {
             ConnectionFactory.getInstance().closeConnection(conn, null, rs);
             md = null;
         }
         return list;
     }