删除json 文本 中特定属性 ,遍历json文本

本文解决如下问题

 通过字符串直接解析出字段:

String jsonData = "{aaa:[{\"name\":\"Michael\",\"age\":20,\"address\":{\"Long_name\":\"4long\",\"short_name\":\"4short\"},\"wife\":[{\"wifename\":\"Mike1\",\"wifena2\":\"Mike1kiss\"},{\"wifename\":\"Mike2\"},{\"wifename\":\"Mike3\"}]},{\"name\":\"Mike\",\"age\":21,\"address\":{\"Long_name\":\"1long\",\"short_name\":\"1short\"}}],\"bb\":\"sdfsdf\"}";

解析后打印出如下

root.aaa[0].name String
root.aaa[0].age Number
root.aaa[0].address.Long_name String
root.aaa[0].address.short_name String
root.aaa[0].wife[0].wifename String
root.aaa[0].wife[0].wifena2 String
root.bb String

2.通过路径删除 json中的属性

详见代码

package testjson;import java.util.ArrayList;import java.util.Collections;import java.util.Iterator;import java.util.LinkedHashMap;import java.util.List;import java.util.Map;import java.util.Map.Entry;import java.util.Set;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONObject;import com.alibaba.fastjson.JSONPath;import com.google.gson.Gson;import com.google.gson.JsonArray;import com.google.gson.JsonElement;import com.google.gson.JsonObject;import com.google.gson.JsonParser;import com.google.gson.JsonPrimitive;public class TestJson {public static void main(String[] args){ String jsonData = "{aaa:[{\"name\":\"Michael\",\"age\":20,\"address\":{\"Long_name\":\"4long\",\"short_name\":\"4short\"},\"wife\":[{\"wifename\":\"Mike1\",\"wifena2\":\"Mike1kiss\"},{\"wifename\":\"Mike2\"},{\"wifename\":\"Mike3\"}]},{\"name\":\"Mike\",\"age\":21,\"address\":{\"Long_name\":\"1long\",\"short_name\":\"1short\"}}],\"bb\":\"sdfsdf\"}";          // 解析获取整个json结构集合          JsonParser  parser  = new JsonParser();          JsonElement element = parser.parse(jsonData);          JsonObject jo=   element.getAsJsonObject();               recJson(element,"root");//解析           System.out.println(jsonData);         JSONObject jsonObject = JSON.parseObject(jsonData);           //1.取出命令集合         //2.解析命令                                   // 删除         List<Integer> l=new ArrayList<Integer>();         maxArrayLength(element,l);         System.out.println(l.size());         if(l.size()>0){         System.out.println(l.get(0));         Integer maxlength=l.get(0);         String  filestr=  "aaa[0].wife[0].wifena2";         for(int i=0;i<maxlength;i++){         String commend="$."+filestr.replaceAll("\\[0\\]", "["+i+"]");         JSONPath.remove(jsonObject, commend);         }         }                  System.out.println(jsonObject.toString());}public static void recJson(JsonElement element,String keyname){if(element==null||element.isJsonNull()){return;}else if(element.isJsonArray()){//JsonArray jsonArray=  element.getAsJsonArray();//for(int i=0;i<jsonArray.size();i++){//System.out.print("[0]"); if(jsonArray.size()>0){    JsonElement  jsonElement=   jsonArray.get(0);    recJson(jsonElement,keyname+"[0]");      }//}//jsonArray.get}else if(element.isJsonObject()){JsonObject jsonObject =element.getAsJsonObject();             for (Entry<String, JsonElement> entry : jsonObject.entrySet()) {       String name = entry.getKey();               JsonElement jsonElement = entry.getValue();               //System.out.print("."+name);             //  elementmap.put(name, value);               recJson(jsonElement,keyname+"."+name);    }}else if(element.isJsonPrimitive()){JsonPrimitive jsonPrimitive=element.getAsJsonPrimitive();if(jsonPrimitive.isBoolean()){System.out.print(keyname+" Boolean");}else if(jsonPrimitive.isNumber()){System.out.print(keyname+" Number");}else if(jsonPrimitive.isString()){System.out.print(keyname+" String");}else{System.out.print(keyname+" 未知");};     System.out.println();return ;}}/** *   aaa[0].age *   @deprecated * ***/public static void removeJsonPorperty(JsonElement element,String removePath){String removePerport=removePath.split("\\.")[0]; if(removePerport.contains("[0]")){       removePerport=removePerport.replaceAll("\\[0\\]", ""); } if(element==null||element.isJsonNull()){ return; }else if(element.isJsonArray()){removePath=removePath.substring(removePath.indexOf(".")+1);JsonArray jsonArray=element.getAsJsonArray();    for(int i=0;i<jsonArray.size();i++){          JsonElement element1= jsonArray.get(i);     removeJsonPorperty(element1,removePath);       element1.toString();    } }else if(element.isJsonObject()){if(removePath.indexOf(".")!=-1){  removePath=removePath.substring(removePath.indexOf(".")+1);  JsonObject jsonObject=element.getAsJsonObject();  jsonObject.entrySet();  JsonElement element1= jsonObject.get(removePerport);  removeJsonPorperty(element1,removePath);}else{JsonObject jsonObject=element.getAsJsonObject();jsonObject.remove(removePath);return;} }}public static void maxArrayLength(JsonElement element,List<Integer> l){if(element==null||element.isJsonNull()){return;}else if(element.isJsonArray()){JsonArray ja=  element.getAsJsonArray(); Integer length= ja.size();if(l.size()<=0){  l.add(length);}else{  l.set(0, Math.max(l.get(0), ja.size()));}        for(int i=0;i<length;i++){    maxArrayLength(ja.get(i),l);    }}else if(element.isJsonObject()){JsonObject j=  element.getAsJsonObject();Set<Entry<String, JsonElement>> sets=   j.entrySet();for(Entry<String, JsonElement> e:sets){    maxArrayLength(e.getValue(),l);}}else{return ;}}}