121 项目 014 笔记向 Java中的escape,unescape方法

package com.laolang.gongda.help.bookstore.address.utils;

/**
* Created by laolang2016 on 2017/2/16 0016.
*/
public class EscapeUnescape {
public static String escape(String src) {
int i;
char j;
StringBuffer tmp = new StringBuffer();
tmp.ensureCapacity(src.length() * 6);
for (i = 0; i < src.length(); i++) {
j = src.charAt(i);
if (Character.isDigit(j) || Character.isLowerCase(j)
|| Character.isUpperCase(j))
tmp.append(j);
else if (j < 256) {
tmp.append("%");
if (j < 16)
tmp.append("0");
tmp.append(Integer.toString(j, 16));
} else {
tmp.append("%u");
tmp.append(Integer.toString(j, 16));
}
}
return tmp.toString();
}

public static String unescape(String src) {
StringBuffer tmp = new StringBuffer();
tmp.ensureCapacity(src.length());
int lastPos = 0, pos = 0;
char ch;
while (lastPos < src.length()) {
pos = src.indexOf("%", lastPos);
if (pos == lastPos) {
if (src.charAt(pos + 1) == 'u') {
ch = (char) Integer.parseInt(src
.substring(pos + 2, pos + 6), 16);
tmp.append(ch);
lastPos = pos + 6;
} else {
ch = (char) Integer.parseInt(src
.substring(pos + 1, pos + 3), 16);
tmp.append(ch);
lastPos = pos + 3;
}
} else {
if (pos == -1) {
tmp.append(src.substring(lastPos));
lastPos = src.length();
} else {
tmp.append(src.substring(lastPos, pos));
lastPos = pos;
}
}
}
return tmp.toString();
}

/**
* @disc 对字符串重新编码
* @param src
* @return
*/
public static String isoToGB(String src) {
String strRet = null;
try {
strRet = new String(src.getBytes("ISO_8859_1"), "GB2312");
} catch (Exception e) {

}
return strRet;
}

/**
* @disc 对字符串重新编码
* @param src
* @return
*/
public static String isoToUTF(String src) {
String strRet = null;
try {
strRet = new String(src.getBytes("ISO_8859_1"), "UTF-8");
} catch (Exception e) {

}
return strRet;
}

}