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ConvertUtils.java
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ConvertUtils.java
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package com.cg.baseproject.utils;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
/**
* @Description:主要功能: 类型转换类
* @Prject: CommonUtilLibrary
* @Package: com.jingewenku.abrahamcaijin.commonutil
* @author: AbrahamCaiJin
* @date: 2017年05月16日 15:26
* @Copyright: 个人版权所有
* @Company:
* @version: 1.0.0
*/
public class ConvertUtils {
private static final char[] DIGITS_LOWER = { '0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
private static final char[] DIGITS_UPPER = { '0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
private ConvertUtils() {
throw new UnsupportedOperationException("cannot be instantiated");
}
/**
* 十六进制字符串转换为byte数组
*
* @param hexString
* @return
*/
public static byte[] hexStringToBytes(String hexString) {
if (hexString == null || hexString.equals("")) {
return null;
}
hexString = hexString.toUpperCase();
int length = hexString.length() / 2;
char[] hexChars = hexString.toCharArray();
byte[] d = new byte[length];
for (int i = 0; i < length; i++) {
int pos = i * 2;
d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
}
return d;
}
/**
* char转换为byte数组
* @param c
* @return
*/
public static byte charToByte(char c) {
return (byte) "0123456789ABCDEF".indexOf(c);
}
/**
* 16进制转化为数字
* @param ch 16进制
* @param index 索引
* @return 转化结果
* @throws Exception 转化失败异常
*/
private static int toDigit(final char ch, final int index)
throws Exception {
final int digit = Character.digit(ch, 16);
if (digit == -1) {
throw new Exception("Illegal hexadecimal character " + ch
+ " at index " + index);
}
return digit;
}
/**
* bytes数组转16进制String
* @param data bytes数组
* @param toDigits DIGITS_LOWER或DIGITS_UPPER
* @return 转化结果
*/
private static String bytes2Hex(final byte[] data, final char[] toDigits) {
final int l = data.length;
final char[] out = new char[l << 1];
// two characters form the hex value.
for (int i = 0, j = 0; i < l; i++) {
out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
out[j++] = toDigits[0x0F & data[i]];
}
return new String(out);
}
/**
* byte数组转换为十六进制字符串
*
* @param b
* @return
*/
public static String bytesToHexString(byte[] b) {
if (b.length == 0) {
return null;
}
StringBuilder sb = new StringBuilder("");
for (int i = 0; i < b.length; i++) {
int value = b[i] & 0xFF;
String hv = Integer.toHexString(value);
if (hv.length() < 2) {
sb.append(0);
}
sb.append(hv);
}
return sb.toString();
}
/**
* int转换为byte数组
*
* @param res
* @return
*/
public static byte[] intToByte(int res) {
byte[] targets = new byte[4];
targets[0] = (byte) (res & 0xff);// 最低位
targets[1] = (byte) ((res >> 8) & 0xff);// 次低位
targets[2] = (byte) ((res >> 16) & 0xff);// 次高位
targets[3] = (byte) (res >>> 24);// 最高位,无符号右移。
return targets;
}
/**
* byte数组转换为int
*
* @param res
* @return
*/
public static int byteToInt(byte[] res) {
// 一个byte数据左移24位变成0x??000000,再右移8位变成0x00??0000
int targets = (res[3] & 0xff) | ((res[2] << 8) & 0xff00) | ((res[1] << 16) & 0xff0000) | ((res[0] << 24) & 0xff000000);
return targets;
}
/**
* 保留几位小数
*/
public static String saveDecimals(int cnt, double value) {
if (cnt == 2)
return String.format("%.02f", value);
else if (cnt == 1)
return String.format("%.01f", value);
else
return String.format("%.0f", value);
}
/**
* null转String
* @param str
* @return
*/
public static String nullOfString(String str) {
if (str == null) {
str = "";
}
return str;
}
/**
* String转Byte
* @param str
* @return
*/
public static byte stringToByte(String str) {
byte b = 0;
if (str != null) {
try {
b = Byte.parseByte(str);
} catch (Exception e) {
}
}
return b;
}
/**
* String转Boolean
* @param str
* @return
*/
public static boolean stringToBoolean(String str) {
if (str == null) {
return false;
} else {
if (str.equals("1")) {
return true;
} else if (str.equals("0")) {
return false;
} else {
try {
return Boolean.parseBoolean(str);
} catch (Exception e) {
return false;
}
}
}
}
/**
* String转Int
* @param str
* @return
*/
public static int stringToInt(String str) {
int i = 0;
if (str != null) {
try {
i = Integer.parseInt(str.trim());
} catch (Exception e) {
i = 0;
}
} else {
i = 0;
}
return i;
}
/**
* String转Short
* @param str
* @return
*/
public static short stringToShort(String str) {
short i = 0;
if (str != null) {
try {
i = Short.parseShort(str.trim());
} catch (Exception e) {
i = 0;
}
} else {
i = 0;
}
return i;
}
/**
* String转Double
* @param str
* @return
*/
public static double stringToDouble(String str) {
double i = 0;
if (str != null) {
try {
i = Double.parseDouble(str.trim());
} catch (Exception e) {
i = 0;
}
} else {
i = 0;
}
return i;
}
/**
* Int转String
* @param i
* @return
*/
public static String intToString(int i) {
String str = "";
try {
str = String.valueOf(i);
} catch (Exception e) {
str = "";
}
return str;
}
/**
* Double转Long
* @param d
* @return
*/
public static long doubleToLong(double d) {
long lo = 0;
try {
//double转换成long前要过滤掉double类型小数点后数据
lo = Long.parseLong(String.valueOf(d).substring(0, String.valueOf(d).lastIndexOf(".")));
} catch (Exception e) {
lo = 0;
}
return lo;
}
/**
* Double转Int
* @param d
* @return
*/
public static int doubleToInt(double d) {
int i = 0;
try {
//double转换成long前要过滤掉double类型小数点后数据
i = Integer.parseInt(String.valueOf(d).substring(0, String.valueOf(d).lastIndexOf(".")));
} catch (Exception e) {
i = 0;
}
return i;
}
/**
* Long转Double
* @param d
* @return
*/
public static double longToDouble(long d) {
double lo = 0;
try {
lo = Double.parseDouble(String.valueOf(d));
} catch (Exception e) {
lo = 0;
}
return lo;
}
/**
* Long转Int
* @param d
* @return
*/
public static int longToInt(long d) {
int lo = 0;
try {
lo = Integer.parseInt(String.valueOf(d));
} catch (Exception e) {
lo = 0;
}
return lo;
}
/**
* String转Long
* @param str
* @return
*/
public static long stringToLong(String str) {
Long li = new Long(0);
try {
li = Long.valueOf(str);
} catch (Exception e) {
//li = new Long(0);
}
return li.longValue();
}
/**
* Long转String
* @param li
* @return
*/
public static String longToString(long li) {
String str = "";
try {
str = String.valueOf(li);
} catch (Exception e) {
}
return str;
}
/**
* byte[] 转为 对象
*
* @param bytes
* @return
*/
public static Object byteToObject(byte[] bytes) throws Exception {
ObjectInputStream ois = null;
try {
ois = new ObjectInputStream(new ByteArrayInputStream(bytes));
return ois.readObject();
} finally {
if (ois != null) ois.close();
}
}
/**
* 对象 转为 byte[]
*
* @param obj
* @return
*/
public static byte[] objectToByte(Object obj) throws Exception {
ObjectOutputStream oos = null;
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
oos = new ObjectOutputStream(bos);
oos.writeObject(obj);
return bos.toByteArray();
} finally {
if (oos != null) oos.close();
}
}
public static void byteToBit(byte[] bytes, StringBuilder sb) {
for (int i = 0; i < Byte.SIZE * bytes.length; i++)
sb.append((bytes[i / Byte.SIZE] << i % Byte.SIZE & 0x80) == 0 ? '0' : '1');
}
public static String byteToBit(byte[] bytes) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < Byte.SIZE * bytes.length; i++)
sb.append((bytes[i / Byte.SIZE] << i % Byte.SIZE & 0x80) == 0 ? '0' : '1');
return sb.toString();
}
public static int convertToint(String intStr, int defValue) {
try {
return Integer.parseInt(intStr);
} catch (NumberFormatException e) {
//e.printStackTrace();
}
return defValue;
}
public static long convertTolong(String longStr, long defValue) {
try {
return Long.parseLong(longStr);
} catch (NumberFormatException e) {
//e.printStackTrace();
}
return defValue;
}
public static float convertTofloat(String fStr, float defValue) {
try {
return Float.parseFloat(fStr);
} catch (NumberFormatException e) {
//e.printStackTrace();
}
return defValue;
}
public static double convertTodouble(String dStr, double defValue) {
try {
return Double.parseDouble(dStr);
} catch (NumberFormatException e) {
//e.printStackTrace();
}
return defValue;
}
public static Integer convertToInteger(String intStr) {
try {
return Integer.parseInt(intStr);
} catch (NumberFormatException e) {
//e.printStackTrace();
}
return null;
}
public static Long convertToLong(String longStr) {
try {
return Long.parseLong(longStr);
} catch (NumberFormatException e) {
//e.printStackTrace();
}
return null;
}
public static Float convertToFloat(String fStr) {
try {
return Float.parseFloat(fStr);
} catch (NumberFormatException e) {
//e.printStackTrace();
}
return null;
}
public static Double convertToDouble(String dStr) {
try {
return Double.parseDouble(dStr);
} catch (NumberFormatException e) {
//e.printStackTrace();
}
return null;
}
}