package com.jzq.common;
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import org.apache.commons.lang3.StringUtils;
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/**
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* 基本工具类
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* @author yfx
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*
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*/
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public abstract class CommonUtil {
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/**
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* 去空，null->''
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*
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* @param str
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* @return
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*/
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public static String trim(String str, String def) {
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if (str == null || "null".equals(str.trim()) || "".equals(str.trim())) {
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return def;
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} else {
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return str.trim();
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}
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}
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/**
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* 去空，null->''
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*
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* @param str
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* @return
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*/
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public static String trim(String str) {
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if (str == null || "null".equals(str.trim())) {
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return "";
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} else {
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return str.trim();
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}
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}
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/**
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* 去空,支持sql（发现为空时返回null）
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*
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* @param str
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* @return
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*/
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public static String trimForSql(String str) {
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if (str == null || "".equals(str.trim()) || "null".equals(str.trim())) {
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return null;
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} else {
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return str.trim();
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}
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}
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/**
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* 默认转换
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*
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* @param obj
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* @param cla
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* @return
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*/
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@SuppressWarnings("unchecked")
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public static <T> T parVal(Object obj, Class<T> cla) {
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if (cla.equals(String.class)) {
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if (obj == null || "".equals(obj + "") || "null".equals(obj)) {
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return (T) "";
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} else {
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return (T) (obj + "");
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}
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} else {
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try {
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if (obj == null)
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return null;
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if (cla.equals(Integer.class))
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return (T) Integer.valueOf(obj + "");
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if (cla.equals(Long.class))
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return (T) Long.valueOf(obj + "");
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if (cla.equals(Float.class))
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return (T) Float.valueOf(obj + "");
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if (cla.equals(Double.class))
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return (T) Double.valueOf(obj + "");
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if (cla.equals(Boolean.class))
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return (T) Boolean.valueOf(obj + "");
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return (T) obj;
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} catch (Exception e) {
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throw new RuntimeException("CommonUtil.parVal error|obj:" + obj+ ",class:" + cla);
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}
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}
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}
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/**
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* 不返回错误的转换
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*
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* @param obj
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* @param cla
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* @return
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*/
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public static <T> T parValNoErr(Object obj, Class<T> cla) {
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try {
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return parVal(obj, cla);
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} catch (Exception e) {
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return null;
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}
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}
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/**
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* 不返回错误的转换，为空或异常时返回默认值
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* @param obj
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* @param cla
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* @param t
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* @return
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*/
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public static <T> T parValNoErrDef(Object obj, Class<T> cla, T t) {
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try {
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T t1 = parVal(obj, cla);
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if (t1 == null || (cla.equals(String.class) && "".equals(t1))) {
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return t;
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}
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return t1;
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} catch (Exception e) {
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return t;
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}
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}
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/**
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* 补位数据 ，前补0
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* @param src
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* @param length
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* @return
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*/
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public static String conver0(Object src, int length) {
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if(src instanceof Number){
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return String.format("%0"+length+"d",src);
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}else if(src instanceof String){
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String str1=((String)src);
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if(str1.length()<length){
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return conver0(0,length-str1.length())+str1;
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}else{
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return str1;
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}
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}else{
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return src+"";
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}
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}
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/**
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* 遮挡字符串
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* 1、当字符串的长度小于总显示的位数时，将把字符串所有字符以*返回
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* 2、当字符串的长度等于总显示的位数时，将把字符串前面位数显示后面位数以*拼接
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* 3、当字符串的长度大于总显示的位数时，将把字符串前面与后面位数显示出来，中间以*拼接
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* @param str
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* @param a 字符串显示前几位
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* @param b 字符串显示后几位
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* @return
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*/
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public static String privacyStr(String str,int a,int b){
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if (StringUtils.isBlank(str)) {
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return null;
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}
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int length = str.length();
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String start = "";
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String end = "";
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String temp = "";
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int le = 0;
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int num = a+b;
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if (length<num) {
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le = length;
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}else if (length==num) {
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le = length-a;
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start = str.substring(0, a);
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}else if (length>num) {
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start = str.substring(0, a);
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end = str.substring(length-b);
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le = length-num;
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}
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for (int i = 0; i < le; i++) {
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temp+="*";
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}
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return start+temp+end;
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}
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}
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