在Javaweb中表单中的参数在提交给servlet时都是以字符串的类型出现，需要对各种参数进行类型的转换，而如果每次都写一遍类型转换方法，代码的实用性太低(其实是懒得写)，于是把这些方法写到一个类中，以后直接调用就好，其中有参数的空值判断，Int类型转换，Double类型转换，Array类型转换，Date类型的转换，Timestamp类型的转换。使用时放入util包中即可，下面是源代码。
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package cn.itshixun; import java.sql.Date; import java.sql.Timestamp; import javax.servlet.http.HttpServletRequest; public class RequestUtil { public static String getString(HttpServletRequest req, String name) { String str = req.getParameter(name); str = isBlank(str) ? "" : str.trim(); return str; } public static int getInt(HttpServletRequest req, String name) { try { return Integer.parseInt(RequestUtil.getString(req, name)); } catch (Exception ex) { return 0; } } public static int[] getIntArray(HttpServletRequest req, String name) { String[] strs = req.getParameterValues(name); if (strs == null) { return null; } int[] array = new int[strs.length]; for (int i = 0; i < strs.length; i++) { array[i] = Integer.parseInt(strs[i]); } return array; } public static double getDouble(HttpServletRequest req, String name) { try { return Double.parseDouble(RequestUtil.getString(req, name)); } catch (Exception ex) { return 0.0; } } public static Date getDate(HttpServletRequest req, String name) { try { return Date.valueOf(RequestUtil.getString(req, name)); } catch (Exception ex) { return null; } } public static Timestamp getTimestamp(HttpServletRequest req, String name) { try { return Timestamp.valueOf(RequestUtil.getString(req, name)); } catch (Exception ex) { return null; } } private static boolean isBlank(String str) { return str == null || str.trim().length() == 0; } } |