package org.myframework.util;

import java.io.BufferedReader;

import java.io.Reader;

import java.io.UnsupportedEncodingException;

import java.util.Arrays;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

/**

* 补充字符串处理的相关方法： 如join ,padding

*

* @author Administrator

*

*/

public class StringUtil {

private static Log log = LogFactory.getLog(StringUtil.class);

/**

* 转化POJO为String

* @param obj

* @return

*/

public static String asString(Object obj) {

return obj != null ? obj.toString() : "";

}

/**

* 判断是否空字符串

*

* @param obj

* @return

*/

public static boolean isEmpty(String obj) {

return (obj.length() == 0 || obj == null);

}

/**

*

* 左侧用字符串补足到一定长度

*

* @see select LPAD('DFSDf',9,'w') from dual;

* @param srcString

* @param padded_length

* @param paddingString

* @return

*/

public static String lpad(String srcString, int padded_length,

String paddingString) {

int srcLength = asString(srcString).length();

int padStrLength = asString(paddingString).length();

if (srcLength < padded_length && !isEmpty(paddingString)

&& !isEmpty(paddingString)) {

int leftLength = padded_length - srcLength;

int cnt = leftLength / padStrLength

+ (leftLength % padStrLength > 0 ? 1 : 0);

StringBuffer sb = new StringBuffer(padStrLength * cnt);

for (int i = 0; i < cnt; i++) {

sb.append(paddingString);

}

return sb.substring(0, leftLength) + srcString;

} else if (srcLength > padded_length)

return srcString.substring(0, padded_length);

else

return srcString;

}

/**

* 右侧用字符串补足到一定长度

*

* @see select RPAD('DFSDf',9,'w') from dual;

* @param srcString

* @param padded_length

* @param paddingString

* @return

*/

public static String rpad(String srcString, int padded_length,

String paddingString) {

int srcLength = asString(srcString).length();

int padStrLength = asString(paddingString).length();

if (srcLength < padded_length && !isEmpty(paddingString)

&& !isEmpty(paddingString)) {

int leftLength = padded_length - srcLength;

int cnt = leftLength / padStrLength

+ (leftLength % padStrLength > 0 ? 1 : 0);

StringBuffer sb = new StringBuffer(padStrLength * cnt);

for (int i = 0; i < cnt; i++) {

sb.append(paddingString);

}

return srcString + sb.substring(0, leftLength);

} else if (srcLength > padded_length)

return srcString.substring(0, padded_length);

else

return srcString;

}

/**

* 将字符串数组链接成字符串

*

* @param list

* @param joinStr

* @return

*/

public static String join(String[] list, String joinStr) {

StringBuffer s = new StringBuffer();

for (int i = 0; list != null && i < list.length; i++) {

if ((i + 1) == list.length) {

s.append(list[i]);

} else {

s.append(list[i]).append(joinStr);

}

}

return s.toString();

}

/**

* firstCharLowerCase

*

* @param s

* String

* @return String

*/

public static String firstCharLowerCase(String s)

{

if (s == null || "".equals(s))

return ("");

return s.substring(0, 1).toLowerCase() + s.substring(1);

}

/**

* firstCharUpperCase

*

* @param s

* String

* @return String

*/

public static String firstCharUpperCase(String s)

{

if (s == null || "".equals(s))

return ("");

return s.substring(0, 1).toUpperCase() + s.substring(1);

}

/**

* 将bss_org_id转换成bssOrgId

*

* @param str

* @return

*/

public static String toBeanPatternStr(String src)

{

String dist = src.toLowerCase();

Pattern pattern = Pattern.compile("_([a-z0-9])");

Matcher matcher = pattern.matcher(dist);

while (matcher.find())

{

dist = dist.replaceFirst(matcher.group(0), matcher.group(1).toUpperCase());

}

return dist;

}

/**

* 把所有的回车换行符换成"\n"，避免页面上的Javascript错误

*

* @param src

* @return

*/

public static String toJSLineSeparateStr(String src)

{

if (src == null)

{

return "";

}

String dist = src;

dist = dist.replaceAll("\r\n", "\\\\n");

dist = dist.replaceAll("\r", "\\\\n");

dist = dist.replaceAll("\n", "\\\\n");

return dist;

}

/**

* 截取指定长度字符串

*

* @param input

* @param tail

* @param length

* @return

*/

public static String getShorterString(String input, String tail, int length) {

tail = isEmpty(tail) ? tail : "";

StringBuffer buffer = new StringBuffer(512);

try {

int len = input.getBytes("GBK").length;

if (len > length) {

int ln = 0;

for (int i = 0; ln < length; i++) {

String temp = input.substring(i, i + 1);

if (temp.getBytes("GBK").length == 2)

ln += 2;

else

ln++;

if (ln <= length)

buffer.append(temp);

}

} else {

return input;

}

buffer.append(tail);

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

return buffer.toString();

}

/**

* 取得GBK编码

*

* @return

*/

public static String getBytesString(String input, String code) {

try {

byte[] b = input.getBytes(code);

return Arrays.toString(b);

} catch (UnsupportedEncodingException e) {

return String.valueOf(code.hashCode());

}

}

/**

* 读取ORACLE的CLOB，转化为String

*

* @param clob

* @return

*/

public static String getStringFromClob(java.sql.Clob clob) {

String result = "";

try {

if (clob == null) {

return null;

}

Reader reader = clob.getCharacterStream();// 得到流

BufferedReader br = new BufferedReader(reader);

String line = br.readLine();

StringBuffer sb = new StringBuffer(1024);

while (line != null) {

sb.append(line);

line = br.readLine();

}

result = sb.toString();

} catch (Exception ex) {

}

return result;

}

public static void main(String[] args) {

String[] jsString = { "aa" };

System.out.println(StringUtil.join(jsString, ","));

for (int i = 0; i < 100; i++) {

log.debug(StringUtil.rpad(String.valueOf(i), 3, "AB"));

}

}

}