<仅支持取JSON字符串中, 简单属性值的配置, 即值内容中不包含\[\]或{}格式的数据>
import org.apache.commons.lang3.StringEscapeUtils;
import org.apache.commons.lang3.StringUtils;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class JsonAttributeFormatTest {
public static void main(String\[\] args) {
String parem = "{ \" param \" :{ \" song_id \" : \" 10023423001 \" }, \" param2 \" :{ \" song_id \" : \" 10023423001 \" , \" sec_code \" : \" 000001 \" , \" sec_short_name \" : \" 万科A \" }, \" param3 \" :{ \" song_id \" : \" 10023423001 \" , \" sec_code \" : \" 000001 \" , \" sec_short_name \" : \" 万科A \" , \" arrtibutes \" :{ \" id \" :2955, \" path \" : \" /file/word \" , \" fileType \" : \" xml \" }}, \" param4 \" :{ \" song_id \" : \" 10023423001 \" , \" sec_code \" : \" 000001 \" , \" sec_short_name \" : \" 万科A \" , \" arrtibutes \" :{ \" id \" :2955, \" path \" : \" /file/word \" , \" fileType \" : \" xml \" , \" arrtibutes2 \" :{ \" id \" :2955, \" path \" : \" /file/word \" , \" fileType \" : \" xml \" }}}, \" param5 \" :{ \" song_id \" : \" 10023423001 \" , \" sec_code \" : \" 000001 \" , \" arrtibutes \" :{ \" id \" :2955, \" path \" : \" /file/word \" , \" fileType \" : \" xml \" }, \" sec_short_name \" : \" 万科A \" }, \" paramList \" :**** ****\\"**** ****name**** ****\\"**** ****,**** ****\\"**** ****work**** ****\\"**** ****,**** ****\\"**** ****good**** ****\\"**** ****, \" paramList2 \" :2,4,6,7, \" paramList3 \" :{**** ****\\"**** ****song_id**** ****\\"**** ****:**** ****\\"**** ****10023423001**** ****\\"**** ****}, \" paramList4 \" :{**** ****\\"**** ****song_id**** ****\\"**** ****:**** ****\\"**** ****10023423001**** ****\\"**** ****},{**** ****\\"**** ****song_id**** ****\\"**** ****:**** ****\\"**** ****10023423001**** ****\\"**** ****,**** ****\\"**** ****sec_code**** ****\\"**** ****:**** ****\\"**** ****000001**** ****\\"**** ****,**** ****\\"**** ****sec_short_name**** ****\\"**** ****:**** ****\\"**** ****万科A**** ****\\"**** ****}, \" parameter \" :{ \" biz_code \" : \" 10023423001 \" , \" biz_title \" : \" 是东风风光 \" , \" userList \" :{**** ****\\"**** ****name**** ****\\"**** ****:**** ****\\"**** ****张三**** ****\\"**** ****,**** ****\\"**** ****phone**** ****\\"**** ****:12355566},{**** ****\\"**** ****name**** ****\\"**** ****:**** ****\\"**** ****李四**** ****\\"**** ****,**** ****\\"**** ****phone**** ****\\"**** ****:1567889}}, \" address \" :null, \" type \" : \"\" , \" song_id \" : \" 132430001 \" }" ;
parem = StringEscapeUtils.unescapeJava (parem);
System.out .println(getFieldListFromJsonStr (parem,"id" ));
}
public static List<String> getFieldListFromJsonStr(String jsonStr, String fieldName) {
List<String> fieldValues = new ArrayList<>();
String regex = "(?<=( \" " + fieldName + " \" :)).*?(?=(,| \\ }))" ; //单属性配置,且内容中不包含\[\]或{}格式数据
Pattern pattern = Pattern.compile (regex);
Matcher matcher = pattern.matcher(jsonStr);
while (matcher.find()) {
if (StringUtils.isNotEmpty (matcher.group().trim())) {
fieldValues.add(matcher.group().trim());
}
}
return fieldValues;
}
}
<在JSON字符串中,通过指定属性名称, 获取任意格式的数据>
import org.apache.commons.lang3.StringEscapeUtils;
import org.springframework.util.StringUtils;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
/**
* jlZhang.oth
*/
public class JsonHandler {
public static void main(String\[\] args) {
String str = "{ \" param \" :{ \" song_id \" : \" 10023423001 \" }, \" param2 \" :{ \" song_id \" : \" 10023423006 \" , \" sec_code \" : \" 000001 \" , \" sec_short_name \" : \" 万科A \" }, \" param3 \" :{ \" song_id \" : \" 10023423001 \" , \" sec_code \" : \" 000001 \" , \" sec_short_name \" : \" 万科A \" , \" arrtibutes \" :{ \" id \" :2955, \" path \" : \" /file/word \" , \" fileType \" : \" xml \" }}, \" paramList \" :**** ****\\"**** ****name**** ****\\"**** ****,**** ****\\"**** ****work**** ****\\"**** ****,**** ****\\"**** ****good**** ****\\"**** ****, \" paramList2 \" :2,4,6,7, \" paramList3 \" :{**** ****\\"**** ****song_id**** ****\\"**** ****:**** ****\\"**** ****10023423001**** ****\\"**** ****}, \" paramList4 \" :{**** ****\\"**** ****song_id**** ****\\"**** ****:**** ****\\"**** ****10023423001**** ****\\"**** ****},{**** ****\\"**** ****song_id**** ****\\"**** ****:**** ****\\"**** ****10023423001**** ****\\"**** ****,**** ****\\"**** ****sec_code**** ****\\"**** ****:**** ****\\"**** ****000001**** ****\\"**** ****,**** ****\\"**** ****sec_short_name**** ****\\"**** ****:**** ****\\"**** ****万科A**** ****\\"**** ****}, \" parameter \" :{ \" biz_code \" : \" 10023423001 \" , \" biz_title \" : \" 是东风风光 \" , \" userList \" :{**** ****\\"**** ****name**** ****\\"**** ****:**** ****\\"**** ****张三**** ****\\"**** ****,**** ****\\"**** ****phone**** ****\\"**** ****:12355566},{**** ****\\"**** ****name**** ****\\"**** ****:**** ****\\"**** ****李四**** ****\\"**** ****,**** ****\\"**** ****phone**** ****\\"**** ****:1567889}}, \" address \" :null, \" type \" : \"\" , \" song_iddd \" :true}" ;
String result = getFiledValueFromJsonStr (str, "arrtibutes" , 300);
System.out .println(result);
}
private static String getFiledValueFromJsonStr(String jsonStr, String fieldName, Integer orderFindNumber) {
if (StringUtils.isEmpty (jsonStr) || StringUtils.isEmpty (fieldName)) {
return "" ;
}
orderFindNumber = (orderFindNumber == null || orderFindNumber <= 1) ? 1 : orderFindNumber;
jsonStr = StringEscapeUtils.unescapeJava (jsonStr);
char \[\] jsonChar = jsonStr.toCharArray();
// 封装\[\]以及{}的定位信息
Map<Integer, Integer> mapIndex = new HashMap<Integer, Integer>(); // 记录成对{}的索引
Map<Integer, Integer> listIndex = new HashMap<Integer, Integer>(); // 记录成对\[\]的索引
Boolean strFlag = null ;
LinkedList<Integer> mapMark = new LinkedList<>();
LinkedList<Integer> listMark = new LinkedList<>();
for (int i = 0; i < jsonChar.length ; i++) {
char c = jsonChari;
if (c == ' ' ) {
continue ;
} else if (c == '"' ) {
if (strFlag != null && strFlag == true ) {
strFlag = null ;
} else {
strFlag = true ;
}
}
if (strFlag == null ) {
if (c == '{' ) {
mapMark.add(i);
} else if (c == '}' ) {
mapIndex.put(mapMark.getLast(), i);
mapMark.removeLast();
} else if (c == '[' ) {
listMark.add(i);
} else if (c == ']' ) {
listIndex.put(listMark.getLast(), i);
listMark.removeLast();
}
}
}
// 定位该属性名称的索引位置
StringBuilder attrSb = new StringBuilder();
attrSb.append(" \" " ).append(fieldName).append(" \" " );
int nameLocation = 0;
for (int i = 0; i < orderFindNumber; i++) {
if (nameLocation == 0) {
if (jsonStr.indexOf(attrSb.toString()) == -1) return "" ; // 首个属性名没设置直接返回
nameLocation = jsonStr.indexOf(attrSb.toString());
} else {
if (jsonStr.indexOf(attrSb.toString(), nameLocation + 1) == -1) continue ; // 后续没找到取上一个属性名
nameLocation = jsonStr.indexOf(attrSb.toString(), nameLocation + 1);
}
}
int markLocation = jsonStr.indexOf(":" , nameLocation);
LinkedList<Integer> strIndex = new LinkedList<>();
LinkedList<Integer> cutOut = new LinkedList<>();
for (int i = markLocation + 1; i < jsonChar.length ; i++) {
char c = jsonChari;
if (c == ' ' ) {
continue ;
} else if (c == '"' ) {
if (strIndex.size() == 0) {
strIndex.add(i);
} else {
strIndex.add(i + 1);
cutOut.addAll(strIndex);
break ;
}
}
if (strIndex.size() == 0) {
if ("n" .equalsIgnoreCase(String.valueOf (c)) || "f" .equalsIgnoreCase(String.valueOf (c)) || "t" .equalsIgnoreCase(String.valueOf (c))) {
// null, false, true值
cutOut.add(i);
int last = (jsonStr.indexOf(":" , i) == -1) ? jsonStr.length() - 1 : jsonStr.indexOf("," , i);
// 排除格式: ..."cache":null}],
while (jsonCharlast == '}' || jsonCharlast == ']' || jsonCharlast == ',' ) {
last = last - 1;
}
cutOut.add(last + 1);
break ;
}
if (Character.isDigit (c)) {
cutOut.add(i);
int last = (jsonStr.indexOf(":" , i) == -1) ? jsonStr.length() - 1 : jsonStr.indexOf("," , i);
// 排除格式: ..."cache":456}],
while (jsonCharlast == '}' || jsonCharlast == ']' || jsonCharlast == ',' ) {
last = last - 1;
}
cutOut.add(last + 1);
break ;
}
if (c == '{' ) {
Integer last = mapIndex.get(i);
if (null != last) {
cutOut.add(i);
cutOut.add(last + 1);
}
break ;
} else if (c == '[' ) {
Integer last = listIndex.get(i);
if (null != last) {
cutOut.add(i);
cutOut.add(last + 1);
}
break ;
}
}
}
// 获取最终的结果
if (cutOut.size() == 0) return "" ;
String result = jsonStr.substring(cutOut.getFirst(), cutOut.getLast());
return result;
}
}