数据库表转javaBean

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package com.study;   import java.io.BufferedWriter; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSetMetaData; import java.sql.SQLException; import java.sql.Statement; import java.util.Properties;   public class TableToJavaBean {       Connection conn = null;           Statement stmt = null;           public Connection getConnection(){                   String driverName = "";                   String url = "";                   String username = "";                   String pwd = "";                   try {             InputStream in = this.getClass().getResourceAsStream("/dbconfig.properties");                           Properties pros = new Properties();                            pros.load(in);                           driverName = pros.getProperty("database.driver");             url = pros.getProperty("database.url");             username =  pros.getProperty("database.user");             pwd =  pros.getProperty("database.password");                           System.out.println(driverName+"=="+url);                           Class.forName(driverName);                           conn = DriverManager.getConnection(url, username, pwd);                       } catch (SQLException e) {         } catch (ClassNotFoundException e) {         } catch (IOException e) {         }         return conn;     }                 public void closeDB(PreparedStatement pstmt) {         if (pstmt != null) {             try {                 pstmt.close();             } catch (Exception ex) {             }         }     }           public void closeDB(Statement stmt) {         if (stmt != null) {             try {                 stmt.close();             } catch (Exception ex) {             }         }     }       public void closeDB(Connection con) {         if (con != null) {             try {                 con.close();             } catch (Exception ex) {             }         }     }             public void toPojo(String tableName) {                   String sql = "select * from "+tableName;         try {                           conn = getConnection();                           PreparedStatement statement = conn.prepareStatement(sql);             //获取数据库的元数据             ResultSetMetaData metadata = statement.getMetaData();             //数据库的字段个数             int len = metadata.getColumnCount();             //字段名称             colnames = new String[len+1];             //字段类型 --->已经转化为java中的类名称了             colTypes = new String[len+1];             for(int i= 1;i<=len;i++){                 colnames[i] = metadata.getColumnName(i); //获取字段名称                 colTypes[i] = sqlType2JavaType(metadata.getColumnTypeName(i)); //获取字段类型                 }         } catch (SQLException e) {           }     }           private String[] colnames; // 列名数组         //列名类型数组          private String[] colTypes;                /*          * mysql的字段类型转化为java的类型*/         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") ||sqlType.equalsIgnoreCase("date")){                   return "Date";               }else if(sqlType.equalsIgnoreCase("image")){                   return "Blod";               }                                return null;           }         /*获取整个类的字符串并且输出为java文件          * */         public  StringBuffer getClassStr(String tableName){             //输出的类字符串             StringBuffer str = new StringBuffer("");             //获取表类型和表名的字段名             this.toPojo(tableName);             //校验             if(null == colnames && null == colTypes) return null;             //拼接             str.append("public class "+tableName+" {\r\n");             //拼接属性             for(int index=1; index < colnames.length ; index++){                 str.append(getAttrbuteString(colnames[index],colTypes[index]));             }             //拼接get，Set方法                   for(int index=1; index < colnames.length ; index++){                 str.append(getGetMethodString(colnames[index],colTypes[index]));                 str.append(getSetMethodString(colnames[index],colTypes[index]));             }             str.append("}\r\n");             //输出到文件中             File file = new File(tableName+".java");             BufferedWriter write = null;               try {                 write = new BufferedWriter(new FileWriter(file));                 write.write(str.toString());                 write.close();             } catch (IOException e) {                   e.printStackTrace();                 if (write != null)                     try {                         write.close();                     } catch (IOException e1) {                                  e1.printStackTrace();                     }             }             return str;         }         /*          * 获取字段字符串*/         public StringBuffer getAttrbuteString(String name, String type) {             if(!check(name,type)) {                 System.out.println("类中有属性或者类型为空");                 return null;             };             String format = String.format("    private %s %s;\n\r", new String[]{type,name});             return new StringBuffer(format);         }         /*          * 校验name和type是否合法*/         public boolean check(String name, String type) {             if("".equals(name) || name == null || name.trim().length() ==0){                 return false;             }             if("".equals(type) || type == null || type.trim().length() ==0){                 return false;             }             return true;                       }         /*          * 获取get方法字符串*/         private StringBuffer getGetMethodString(String name, String type) {             if(!check(name,type)) {                 System.out.println("类中有属性或者类型为空");                 return null;             };             String Methodname = "get"+GetTuoFeng(name);             String format = String.format("    public %s %s(){\n\r", new Object[]{type,Methodname});             format += String.format("        return this.%s;\r\n", new Object[]{name});             format += "    }\r\n";             return new StringBuffer(format);         }         //将名称首字符大写         private String GetTuoFeng(String name) {             name = name.trim();             if(name.length() > 1){                 name = name.substring(0, 1).toUpperCase()+name.substring(1);             }else             {                 name = name.toUpperCase();             }             return name;         }         /*          * 获取字段的get方法字符串*/         private Object getSetMethodString(String name, String type) {             if(!check(name,type)) {                 System.out.println("类中有属性或者类型为空");                 return null;             };             String Methodname = "set"+GetTuoFeng(name);             String format = String.format("    public void %s(%s %s){\n\r", new Object[]{Methodname,type,name});             format += String.format("        this.%s = %s;\r\n", new Object[]{name,name});             format += "    }\r\n";             return new StringBuffer(format);         }      }