使用solr搜索时，如果要查询的字段值中含有+ - ^等特殊字符时，我们可以使用solr自带的ClientUtils.escapeQueryChars("特殊字符的字符串")进行转义，否则会报错，其中可以转义的字符有
'\\' '+' '-' '!' '(' ')' ':' '^' '[' ']' '\"' '{' '}' '~'
'*' '?' '|' '&' ';' '/' 和空白串
源码如下：
public static String escapeQueryChars(String s) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
// These characters are part of the query syntax and must be escaped
if (c == '\\' || c == '+' || c == '-' || c == '!' || c == '(' || c == ')' || c == ':'
|| c == '^' || c == '[' || c == ']' || c == '\"' || c == '{' || c == '}' || c == '~'
|| c == '*' || c == '?' || c == '|' || c == '&' || c == ';' || c == '/'
|| Character.isWhitespace(c)) {
sb.append('\\');
}
sb.append(c);
}
return sb.toString();
}