Javaweb中封装servlet对post参数的各种类型转换方法

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。

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;
    }
}