jsp中框架页面请求中的中文编码问题

StringBuffer sbuf = new StringBuffer();
int i = 0;
int len = s.length();
while (i < len) {
int ch = s.charAt(i);
if ('A' <= ch && ch <= 'Z') { // 'A'..'Z' : as it was
sbuf.append((char) ch);
} else if ('a' <= ch && ch <= 'z') { // 'a'..'z' : as it was
sbuf.append((char) ch);
} else if ('0' <= ch && ch <= '9') { // '0'..'9' : as it was
sbuf.append((char) ch);
} else if (ch == '-' || ch == '_' // unreserved : as it was
|| ch == '.' || ch == '!' || ch == '~' || ch == '*'
|| ch == '\'' || ch == '(' || ch == ')') {
sbuf.append((char) ch);
} else if (ch == '%') {
int cint = 0;
if ('u' != s.charAt(i 1)) { // %XX : map to ascii(XX)
cint = (cint << 4) | val[s.charAt(i 1)];
cint = (cint << 4) | val[s.charAt(i 2)];
i = 2;
} else { // %uXXXX : map to unicode(XXXX)
cint = (cint << 4) | val[s.charAt(i 2)];
cint = (cint << 4) | val[s.charAt(i 3)];
cint = (cint << 4) | val[s.charAt(i 4)];
cint = (cint << 4) | val[s.charAt(i 5)];
i = 5;
}
sbuf.append((char) cint);
} else { // 对应的字符未经过编码
sbuf.append((char) ch);
}
i ;
}
return sbuf.toString();
}

public static void main(String[] args) {
String stest = "中文1234 abcd[]()< >,.~\\";
System.out.println(stest);
System.out.println(escape(stest));
System.out.println(unescape(escape(stest)));
}

}

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