JSON格式如下：
{"username":"tom","age":18,"address":[{"province":"上海市"},{"city":"上海市"},{"disrtict":"静安区"
}]}
处理后，得到的结果如下:
address
|province|city|disrtict|username|
age
package
ai.advance.until;
import
com.alibaba.fastjson.JSONObject;
import
com.alibaba.fastjson.JSONArray;
public
class
fastJsonDiff {
* 递归读取所有的key
*
@param
jsonObject
public
static
StringBuffer getAllKey(JSONObject jsonObject) {
StringBuffer stringBuffer
=
new
StringBuffer();
Iterator
<String> keys = jsonObject.keySet().iterator();
//
jsonObject.keys();
while
(keys.hasNext()) {
String key
=
keys.next();
stringBuffer.append(key.toString()).append(
"|"
);
if
(jsonObject.get(key)
instanceof
JSONObject) {
JSONObject innerObject
=
(JSONObject) jsonObject.get(key);
stringBuffer.append(getAllKey(innerObject));
}
else
if
(jsonObject.get(key)
instanceof
JSONArray) {
JSONArray innerObject
=
(JSONArray) jsonObject.get(key);
stringBuffer.append(getAllKey(innerObject));
return
stringBuffer;
public
static
StringBuffer getAllKey(JSONArray json1) {
StringBuffer stringBuffer
=
new
StringBuffer();
if
(json1 !=
null
) {
Iterator i1
=
json1.iterator();
while
(i1.hasNext()) {
Object key
=
i1.next();
if
(key
instanceof
JSONObject) {
JSONObject innerObject
=
(JSONObject) key;
stringBuffer.append(getAllKey(innerObject));
}
else
if
(key
instanceof
JSONArray) {
JSONArray innerObject
=
(JSONArray) key;
stringBuffer.append(getAllKey(innerObject));
}
else
{
return
stringBuffer;
private
final
static
String st1 = "{\"username\":\"tom\",\"age\":18,\"address\":[{\"province\":\"上海市\"},{\"city\":\"上海市\"},{\"disrtict\":\"静安区\"}]}"
;
private
final
static
String st2 = "{username:\"tom\",age:18}"
;
public
static
void
main(String[] args) {
System.out.println(st1);
JSONObject jsonObject1
=
JSONObject.parseObject(st1);
StringBuffer stb
=
getAllKey(jsonObject1);
System.err.println(stb);
