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function getJsonValuesByAwk() {
awk -v json="$1" -v key="$2" -v defaultValue="$3" 'BEGIN{
foundKeyCount = 0
while (length(json) > 0) {
# pos = index(json, "\""key"\""); ## 这行更快一些，但是如果有value是字符串，且刚好与要查找的key相同，会被误认为是key而导致值获取错误
pos = match(json, "\""key"\"[ \\t]*?:[ \\t]*");
if (pos == 0) {if (foundKeyCount == 0) {print defaultValue;} exit 0;}
++foundKeyCount;
start = 0; stop = 0; layer = 0;
for (i = pos + length(key) + 1; i <= length(json); ++i) {
lastChar = substr(json, i - 1, 1)
currChar = substr(json, i, 1)
if (start <= 0) {
if (lastChar == ":") {
start = currChar == " " ? i + 1: i;
if (currChar == "{" || currChar == "[") {
layer = 1;
}
}
} else {
if (currChar == "{" || currChar == "[") {
++layer;
}
if (currChar == "}" || currChar == "]") {
--layer;
}
if ((currChar == "," || currChar == "}" || currChar == "]") && layer <= 0) {
stop = currChar == "," ? i : i + 1 + layer;
break;
}
}
}
if (start <= 0 || stop <= 0 || start > length(json) || stop > length(json) || start >= stop) {
if (foundKeyCount == 0) {print defaultValue;} exit 0;
} else {
print substr(json, start, stop - start);
}
json = substr(json, stop + 1, length(json) - stop)
}
}'
}
json='{"code":200,"msg":"success","data":{"orderNo":"test_order_no"}}'
getJsonValuesByAwk "$json" "code" "defaultValue"
getJsonValuesByAwk "$json" "data" "defaultValue"
getJsonValuesByAwk "$json" "orderNo" "defaultValue"
200
{"orderNo":"test_order_no"}
"test_order_no"
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