The sort of jsonarray in Java, using Gson

Use Gson to parse the JSON string into a JSON object.

Code First: The following is the code inside the Main method

 PackageTestjava;Importjava.util.ArrayList;Importjava.util.Collections;Importjava.util.List;ImportCom.google.gson.JsonParser;ImportCom.google.gson.JsonArray;ImportCom.google.gson.JsonObject; Public classTestjava { Public Static voidMain (string[] args) {//TODO auto-generated Method StubJsoaarraysort (); }     Public Static voidJsoaarraysort () {String arraydata= "[" + "{\" name\ ": \" tvs\ ", \" no\ ":" + 202 + ", \" length\ ":" + + "}," + "{\" name\ ": \" Tvc\ ", \ "No\": "+ 203 +", \ "length\": "+ + +"}, "+" {\ "name\": \ "wel\", \ "no\": "+ 345 +", \ "length\": "+ 35 +"}, "+" {\ "name\": \ "Sma\", \ "no\": "+ 678 +", \ "length\": "+ +"}, "+" {\ "name\": \ "Sma\", \ "No                \ ":" + 136 + ", \" length\ ":" + + + "}," + "{\" name\ ": \" cus\ ", \" no\ ":" + 257 + ", \" length\ ":" + 17 + "},"  + "{\" name\ ": \" and\ ", \" no\ ":" + 678 + ", \" length\ ":" + + "}," + "{\" name\ ": \" roo\ ", \" no\ ":" + 136 + ", \" length\ ":" + 56 + "}" + "]"; Jsonparser Parser=NewJsonparser (); Jsonarray Jsonarray=Parser.parse (arraydata). Getasjsonarray (); System.out.println ("Init jsonarray=" +jsonarray.tostring ()); Jsonarray Sort_jsonarray=NewJsonarray (); List<JsonObject> list =NewArraylist<jsonobject>(); Jsonobject Jsonobj=NULL;  for(inti = 0; I < jsonarray.size (); i++) {Jsonobj=(jsonobject) jsonarray.get (i);        List.add (Jsonobj); }        //The most central place here is the Sortcomparator class.//the parameters of which the method is constructed://Sortitem is an element in the Jsonarray to be sorted, here I choose to be name, can also choose no or length//SortType is a sort of type, there are three kinds of situations//1. The value of the sorted element corresponds to int, then sorttype = "int"; //2. The value of the ordered element corresponds to a string, then SortType = "string"; //3. The sorted elements correspond to other types, which are not sorted by default (can be extended later)//Sortdire is the direction of the sort, either ASC or DESC, the default is the original direction of the data (that is, there is no sort direction)String Sortitem = "Length"; String SortType= "int"; String Sortdire= "desc"; Collections.sort (list,New sortcomparator (Sortitem, SortType, Sortdire));  for(inti = 0; I < list.size (); i++) {Jsonobj=List.get (i);        Sort_jsonarray.add (Jsonobj); } System.out.println ("After sort_jsonarray=" +sort_jsonarray.tostring ()); }}

The following gives Sortcomparator.java

 PackageTestjava;ImportJava.util.Comparator;ImportCom.google.gson.JsonObject; Public classSortcomparatorImplementsComparator<jsonobject> {        PrivateString Sortitem; PrivateString SortType; PrivateString Sortdire;  Publicsortcomparator (String Sortitem, String SortType, String sortdire) { This. Sortitem =Sortitem;  This. SortType =SortType;  This. Sortdire =Sortdire; } @Override Public intCompare (Jsonobject O1, Jsonobject O2) {String value1=o1.getasjsonobject (). Get (Sortitem). getasstring (); String value2=o2.getasjsonobject (). Get (Sortitem). getasstring (); if("int". Equalsignorecase ( This. SortType)) {//int Sort            intInt1 =Integer.parseint (value1); intInt2 =Integer.parseint (value2); if("ASC". Equalsignorecase ( This. Sortdire)) {                returnInt1-Int2; } Else if("desc". Equalsignorecase ( This. Sortdire)) {                returnInt2-int1; } Else {                return0; }              } Else if("string". Equalsignorecase ( This. SortType)) {//string Sort            if("ASC". Equalsignorecase ( This. Sortdire)) {                returnValue1.compareto (value2); } Else if("desc". Equalsignorecase ( This. Sortdire)) {                returnValue2.compareto (value1); } Else {                return0; }        } Else{//Nothing sort            return0; }            }}

Results of the test:

the initial values of the Jsonarray are as follows: [{"name": "TVS", "no": 202, "Length": +}, {"name": "TVC", "No": 203, "Length": +}, {"name": " Wel "," no ": 345," Length ": +}, {" name ":" SMA "," no ": 678," Length ":", "" SMA "," no ": 136," Length ": +}, {" name ":" Cus "," no ": 257," Length ": +}, {" name ":" and "," no ": 678," Length ": +} , {"Name": "Roo", "No": 136, "Length":];

 The following is a small arrival sorted by the Name element: sortcomparator ("Name", "string", "ASC"  )  after Sort_jsonarray  =[{  "name": "and", "no": 678, "Length": 16}, { "name": "Cus", "no": 257, "Length" : 17 "Name": "Roo", "No": 136, "Length": 56}, {  "name": "SMA", "no": 678, "Length": 45}, { "name": "SMA", "no": 136, "Length" : 15 "Name": "TVC", "No": 203, "Length": 14}, {  "name": "TVS", "no": 202, "Length": 23}, { "name": "Wel", "no": 345, "Length" : 35 

 The following is the order of the name elements from large to small:  Sortcomparator ("Name", "string", "desc"  )  after Sort_jsonarray  =[{  "name": "Wel", "no": 345, "Length": 35}, { "name": "TVS", "no": 202, "Length" : 23 "Name": "TVC", "No": 203, "Length": 14}, {
      "name": "SMA", "no": 678, "Length": 45}, { "name": "SMA", "no": 136, "Length": 15  "Name": "Roo", "No": 136, "Length": 56}, {  "name": "Cus", "no": 257, "Length": 17}, { "name": "and", "No": 678, "Length" : 16 

 The following is ordered from small to large by the Length element: sortcomparator ("Length", "int", "ASC"  )  after Sort_jsonarray  =[{  "name": "TVC", "No": 203, "Length": 14}, { "name": "Sma", "no": 136, "Length" : 15 "Name": "and", "No": 678, "Length": 16}, {
      "name": "Cus", "no": 257, "Length": 17}, { "name": "TVS", "no": 202, "Length": 23  "Name": "Wel", "No": 345, "Length": 35}, {  "name": "Sma", "no": 678, "Length": 45}, { "name": "Roo", "no": 136, "Length" : 56 

The following are sorted by the Length element from large to small: sortcomparator ("Length", "int", "desc")after Sort_jsonarray=[    {"Name": "Roo", "No": 136, "Length":.    {"name": "Sma", "no": 678, "Length": "{"},    {"name": "Wel", "no": 345, "Length": +},    {" Name ":" "TVS", "no": 202, "Length": +},    {"name": "Cus", "no": 257, "Length": +},    {"name ":" and "," No ": 678," Length ": +},    {" name ":" Sma "," no ": 136," Length ":},    {" name ":" TVC "," No ": 203," Length ": +}]

The sort of jsonarray in Java, using Gson