java 工具篇（MySQL数据库工具） 数据库实体创建

package com.mysql.util;

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.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Date;

public class GenEntityMysql {
	private String packageOutPath = "com.itaas.entity";// 指定实体生成所在包的路径
	private String authorName = "周志刚";// 作者名字
	private String tablename = "TB_SW_BLADE_COLL";// 表名
	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.* 
	
	// 数据库连接
	private static final String URL = "jdbc:mysql://192.168.0.32:3306/ITaa?useUnicode=true&characterEncoding=utf-8";
	private static final String NAME = "root";
	private static final String PASS = "Vixuan724";
	private static final String DRIVER = "com.mysql.jdbc.Driver";
	
	/* 
	     * 构造函数 
	     */  
	   public GenEntityMysql(){  
	       //创建连接  
	        Connection con;  
	       //查要生成实体类的表  
	       String sql = "select * from " + tablename;  
	       PreparedStatement pStemt = null;  
	       try {  
	           try {  
	               Class.forName(DRIVER);  
	           } catch (ClassNotFoundException e1) {  
	               // TODO Auto-generated catch block  
	              e1.printStackTrace();  
	           }  
	           con = DriverManager.getConnection(URL,NAME,PASS);  
	            pStemt = con.prepareStatement(sql);  
	           ResultSetMetaData rsmd = pStemt.getMetaData();  
	           int size = rsmd.getColumnCount();   //统计列  
	           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("");  
	               //System.out.println("绝对路径："+directory.getAbsolutePath());  
	               //System.out.println("相对路径："+directory.getCanonicalPath()); 
	              //获取当前项目路径
	               String path=this.getClass().getResource("").getPath();  
	                
	               System.out.println(path);  
              System.out.println("src/?/"+path.substring(path.lastIndexOf("/com/", path.length())) );  
	 
	                String outputPath = directory.getAbsolutePath()+ "/src/"+this.packageOutPath.replace(".", "/")+"/"+initcap(tablename) + ".java";  
	               FileWriter fw = new FileWriter(outputPath);  
	               PrintWriter pw = new PrintWriter(fw);  
	                pw.println(content);  
	                pw.flush();  
	               pw.close();  
	            } catch (IOException e) {  
	                e.printStackTrace();  
	          }  
	             
	        } catch (SQLException e) {  
	           e.printStackTrace();  
	       } finally{  
	
	        }  
	    } 
	   
	   /** 
	      * 功能：生成实体类主体代码 
	        * @param colnames 
	        * @param colTypes 
	        * @param colSizes 
	       * @return 
	        */  
	      private String parse(String[] colnames, String[] colTypes, int[] colSizes) {  
	         StringBuffer sb = new StringBuffer();  
	            
	          //判断是否导入工具包  
	           if(f_util){  
	              sb.append("import java.util.Date;\r\n");  
	          }  
	           if(f_sql){  
	             sb.append("import java.sql.*;\r\n");  
	          }  
	         sb.append("package " + this.packageOutPath + ";\r\n");  
	          sb.append("\r\n");  
	         //注释部分  
	         sb.append("   /**\r\n");  
	         sb.append("    * "+tablename+" 实体类\r\n");  
	        sb.append("    * "+new Date()+" "+this.authorName+"\r\n");  
	         sb.append("    */ \r\n");  
	         //实体部分  
	         sb.append("\r\n\r\npublic class " + initcap(tablename) + "{\r\n");  
	         processAllAttrs(sb);//属性  
	          processAllMethod(sb);//get set方法  
	         sb.append("}\r\n");  
	             
	         //System.out.println(sb.toString());  
	        return sb.toString();  
	      }  
	       
	   /** 
	      * 功能：生成所有属性 
	      * @param sb 
	      */  
	     private void processAllAttrs(StringBuffer sb) {  
	           
	          for (int i = 0; i < colnames.length; i++) {  
	           sb.append("\tprivate " + sqlType2JavaType(colTypes[i]) + " " + colnames[i] + ";\r\n");  
	          }  
	           
	    }  
	 
	  /** 
	      * 功能：生成所有方法 
	       * @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("\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");  
	       }  
	           
	     }  
	     
	      /** 
	      * 功能：将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);  
	     }  
	   
	     /** 
	       * 功能：获得列的数据类型 
	       * @param sqlType 
	        * @return 
	       */  
	      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[] arg){
	    	 new GenEntityMysql();  
	     }
	   
	   

}