java 用 escape unescape 实现中文编码解码实例

package opensns.util;
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) {
if(src == null)return null;
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 if (src.charAt(pos + 1) == ‘ ‘
|| src.charAt(pos + 1) == ‘;’) {
tmp.append(src.substring(pos, pos + 1));
lastPos = pos + 1;
} 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();
}

public static void main(String[] args) {
String tmp = “中文”;
System.out.println(“testing escape : ” + tmp);
tmp = escape(tmp);
System.out.println(tmp);
System.out.println(“testing unescape :” + tmp);
System.out.println(unescape(“%u6211%u4eec”));
}
}

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