python爬虫项目实战源码

package sc.util; import java.math.BigDecimal; import java.sql.Date; import java.sql.Time; import java.sql.Timestamp; import java.text.DateFormat; import java.text.NumberFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Locale; /** * 类型转换辅助工具 * @version:1.0 */ public class TypeCaseHelper { /** * 转换核心实现方法 * * @param obj * @param type * @param format * @return Object * @throws TypeCastException */ public static Object convert(Object obj, String type, String format) throws TypeCastException { Locale locale = new Locale("zh", "CN", ""); if (obj == null) return null; if (obj.getClass().getName().equals(type)) return obj; if ("Object".equals(type) || "java.lang.Object".equals(type)) return obj; String fromType = null; if (obj instanceof String) { fromType = "String"; String str = (String) obj; if ("String".equals(type) || "java.lang.String".equals(type)) return obj; if (str.length() == 0) return null; if ("Boolean".equals(type) || "java.lang.Boolean".equals(type)) { Boolean value = null; if (str.equalsIgnoreCase("TRUE")) value = new Boolean(true); else value = new Boolean(false); return value; } if ("Double".equals(type) || "java.lang.Double".equals(type)) try { Number tempNum = getNf(locale).parse(str); return new Double(tempNum.doubleValue()); } catch (ParseException e) { throw new TypeCastException("Could not convert " + str + " to " + type + ": ", e); } if ("BigDecimal".equals(type) || "java.math.BigDecimal".equals(type)) try { BigDecimal retBig = new BigDecimal(str); int iscale = str.indexOf("."); int keylen = str.length(); if (iscale > -1) { iscale = keylen - (iscale + 1); return retBig.setScale(iscale, 5); } else { return retBig.setScale(0, 5); } } catch (Exception e) { throw new TypeCastException("Could not convert " + str + " to " + type + ": ", e); } if ("Float".equals(type) || "java.lang.Float".equals(type)) try { Number tempNum = getNf(locale).parse(str); return new Float(tempNum.floatValue()); } catch (ParseException e) { throw new TypeCastException("Could not convert " + str + " to " + type + ": ", e); } if ("Long".equals(type) || "java.lang.Long".equals(type)) try { NumberFormat nf = getNf(locale); nf.setMaximumFractionDigits(0); Number tempNum = nf.parse(str); return new Long(tempNum.longValue()); } catch (ParseException e) { throw new TypeCastException("Could not convert " + str + " to " + type + ": ", e); } if ("Integer".equals(type) || "java.lang.Integer".equals(type)) try { NumberFormat nf = getNf(locale); nf.setMaximumFractionDigits(0); Number tempNum = nf.parse(str); return new Integer(tempNum.intValue()); } catch (ParseException e) { throw new TypeCastException("Could not convert " + str + " to " + type + ": ", e); } if ("Date".equals(type) || "java.sql.Date".equals(type)) { if (format == null || format.length() == 0) try { return Date.valueOf(str); } catch (Exception e) { try { DateFormat df = null; if (locale != null) df = DateFormat.getDateInstance(3, locale); else df = DateFormat.getDateInstance(3); java.util.Date fieldDate = df.parse(str); return new Date(fieldDate.getTime()); } catch (ParseException e1) { throw new TypeCastException("Could not convert " + str + " to " + type + ": ", e); } } try { SimpleDateFormat sdf = new SimpleDateFormat(format); java.util.Date fieldDate = sdf.parse(str); return new Date(fieldDate.getTime()); } catch (ParseException e) { throw new TypeCastException("Could not convert " + str + " to " + type + ": ", e); } } if ("Timestamp".equals(type) || "java.sql.Timestamp".equals(type)) { if (str.length() == 10) str = str + " 00:00:00"; if (format == null || format.length() == 0) try { return Timestamp.valueOf(str); } catch (Exception e) { try { DateFormat df = null; if (locale != null) df = DateFormat.getDateTimeInstance(3, 3, locale); else df = DateFormat.getDateTimeInstance(3, 3); java.util.Date fieldDate = df.parse(str); return new Timestamp(fieldDate.getTime()); } catch (ParseException e1) { throw new TypeCastException("Could not convert " + str + " to " + type + ": ", e); } } try { SimpleDateFormat sdf = new SimpleDateFormat(format); java.util.Date fieldDate = sdf.parse(str); return new Timestamp(fieldDate.getTime()); } catch (ParseException e) { throw new TypeCastException("Could not convert " + str + " to " + type + ": ", e); } } else { throw new TypeCastException("Conversion from " + fromType + " to " + type + " not currently supported"); } } if (obj instanceof BigDecimal) { fromType = "BigDecimal"; BigDecimal bigD = (BigDecimal) obj; if ("String".equals(type)) return getNf(locale).format(bigD.doubleValue()); if ("BigDecimal".equals(type) || "java.math.BigDecimal".equals(type)) return obj; if ("Double".equals(type)) return new Double(bigD.doubleValue()); if ("Float".equals(type)) return new Float(bigD.floatValue()); if ("Long".equals(type)) return new Long(Math.round(bigD.doubleValue())); if ("Integer".equals(type)) return new Integer((int) Math.round(bigD.doubleValue())); else throw new TypeCastException("Conversion from " + fromType + " to " + type + " not currently supported"); } if (obj instanceof Double) { fromType = "Double"; Double dbl = (Double) obj; if ("String".equals(type) || "java.lang.String".equals(type)) return getNf(locale).format(dbl.doubleValue()); if ("Double".equals(type) || "java.lang.Double".equals(type)) return obj; if ("Float".equals(type) || "java.lang.Float".equals(type)) return new Float(dbl.floatValue()); if ("Long".equals(type) || "java.lang.Long".equals(type)) return new Long(Math.round(dbl.doubleValue())); if ("Integer".equals(type) || "java.lang.Integer".equals(type)) return new Integer((int) Math.round(dbl.doubleValue())); if ("BigDecimal".equals(type) || "java.math.BigDecimal".equals(type)) return new BigDecimal(dbl.toString()); else throw new TypeCastException("Conversion from " + fromType + " to " + type + " not currently supported"); } if (obj instanceof Float) { fromType = "Float"; Float flt = (Float) obj; if ("String".equals(type)) return getNf(locale).format(flt.doubleValue()); if ("BigDecimal".equals(type) || "java.math.BigDecimal".equals(type)) return new BigDecimal(flt.doubleValue()); if ("Double".equals(type)) return new Double(flt.doubleValue()); if ("Float".equals(type)) return obj; if ("Long".equals(type)) return new Long(Math.round(flt.doubleValue())); if ("Integer".equals(type)) return new Integer((int) Math.round(flt.doubleValue())); else throw new TypeCastException("Conversion from " + fromType + " to " + type + " not currently supported"); } if (obj instanceof Long) { fromType = "Long"; Long lng = (Long) obj; if ("String".equals(type) || "java.lang.String".equals(type)) return getNf(locale).format(lng.longValue()); if ("Double".equals(type) || "java.lang.Double".equals(type)) return new Double(lng.doubleValue()); if ("Float".equals(type) || "java.lang.Float".equals(type)) return new Float(lng.floatValue()); if ("BigDecimal".equals(type) || "java.math.BigDecimal".equals(type)) return new BigDecimal(lng.toString()); if ("Long".equals(type) || "java.lang.Long".equals(type)) return obj; if ("Integer".equals(type) || "java.lang.Integer".equals(type)) return new Int