gson 用于排序和选择的Java应用程序

jaql4c8m  于 2022-11-06  发布在  Java
关注(0)|答案(1)|浏览(178)

我需要开发一个简单的应用程序，根据预定义的规则对数据进行排序和选择。该应用程序必须能够处理任意结构的对象的JSON列表，选择包含具有特定值的键的对象，并且还可以使用自然排序顺序按值对对象进行排序。
我创建了一个应用程序，它使用“include”规则来接受一组键：值对，以检查条目是否匹配。

  1. static class DataJSON{
  3.         public condition condition;
  5.         public ArrayList<data> data;
  6.         public class exclude{
  7.             public String name;
  8.             public Integer rating;
  9.             public Boolean disabled;
  10.             public String user;
  11.         }
  12.         public class include{
  13.             public String name;
  14.             public Integer rating;
  15.             public Boolean disabled;
  16.             public String user;
  17.         }
  18.         public class data{
  19.             public Boolean disabled;
  20.             public Integer rating;
  21.             public String user;
  22.             public String name;
  23.         }
  24.         public class condition{
  25.             public ArrayList<exclude> exclude;
  26.             public ArrayList<include> include;
  27.             public ArrayList<String> sort_by;
  28.         }
  29.     }
  30.     static class resultPrepare{
  31.         public Boolean disabled;
  32.         public Integer rating;
  33.         public String user;
  34.         public String name;
  35.         public resultPrepare(Boolean disabled, Integer rating, String user, String name){
  36.             this.disabled = disabled;
  37.             this.rating = rating;
  38.             this.user = user;
  39.             this.name = name;
  40.         }
  41.     }
  42.     static class DataResult{
  43.         //public Test.result result;
  44.         public static ArrayList<result> result;
  45.         public DataResult(ArrayList<result> result){
  46.             this.result = result;
  47.         }
  48.     }
  49.     public static class result{
  50.         public Boolean disabled;
  51.         public Integer rating;
  52.         public String user;
  53.         public String name;
  54.         public result(Boolean disabled, Integer rating, String user, String name){
  55.             this.disabled = disabled;
  56.             this.rating = rating;
  57.             this.user = user;
  58.             this.name = name;
  59.         }
  60.     }
  62.     public static void main(String[] args){
  63.         String json = "{\"data\": [{\"user\": \"mike@mail.com\", \"rating\": 20, \"disabled\": false, \"name\": \"Ton1\"},\n" +
  64.                 "{\"user\": \"greg@mail.com\", \"rating\": 14, \"disabled\": false, \"name\": \"Ton\"},\n" +
  65.                 "{\"user\": \"john@mail.com\", \"rating\": 25, \"disabled\": false, \"name\": \"T\"}],\n" +
  66.                 "\"condition\": {\"include\": [{\"name\": \"Ton1\"}],\"exclude\": [{\"disabled\": false, \"name\": \"Tonf\"},{\"disabled\": false, \"name\": \"T\"}], \"sort_by\": [\"rating\"]}}";
  67.         Gson gson = new Gson();
  68.         DataJSON jsParse = gson.fromJson(json, DataJSON.class);
  69.         ArrayList<result> res = new ArrayList<result>();
  70.         for(int i = 0; i < jsParse.data.size(); i++){
  71.             Boolean flagInclude = false;
  72.             Boolean flagExclude = false;
  73.             Boolean flagExcludeDisabled = false;
  74.             if(jsParse.condition.include != null){
  75.                 for(int j = 0; j < jsParse.condition.include.size(); j++){
  76.                     if(jsParse.data.get(i).name != null && jsParse.condition.include.get(j).name != null){
  77.                         if(jsParse.data.get(i).name.equalsIgnoreCase(jsParse.condition.include.get(j).name) || jsParse.condition.include.get(j).name == null){
  78.                             if(jsParse.data.get(i).disabled == jsParse.condition.include.get(j).disabled || jsParse.condition.include.get(j).disabled == null){
  79.                                 if(jsParse.data.get(i).rating == jsParse.condition.include.get(j).rating || jsParse.condition.include.get(j).rating == null){
  80.                                     if((jsParse.data.get(i).user!= null && jsParse.condition.include.get(j).user != null)|| jsParse.condition.include.get(j).user == null){
  81.                                         if(jsParse.data.get(i).user.equalsIgnoreCase(jsParse.condition.include.get(j).user) || jsParse.condition.include.get(j).user == null){
  82.                                             flagInclude = true;
  83.                                             break;
  84.                                         }
  85.                                     }
  86.                                 }
  87.                             }
  88.                         }
  89.                     }
  90.                 }
  91.             }else{
  92.                 flagInclude = true;
  93.             }
  94.             if(jsParse.condition.exclude != null){
  95.                 for(int j = 0; j < jsParse.condition.exclude.size(); j++){
  96.                     if(jsParse.data.get(i).name != null && jsParse.condition.exclude.get(j).name != null){
  97.                         if(jsParse.data.get(i).name.equalsIgnoreCase(jsParse.condition.exclude.get(j).name) || jsParse.condition.exclude.get(j).name == null){
  98.                             if(jsParse.data.get(i).disabled == jsParse.condition.exclude.get(j).disabled || jsParse.condition.exclude.get(j).disabled == null){
  99.                                 if(jsParse.data.get(i).rating == jsParse.condition.exclude.get(j).rating || jsParse.condition.exclude.get(j).rating == null){
  100.                                     if((jsParse.data.get(i).user!= null && jsParse.condition.exclude.get(j).user != null)|| jsParse.condition.exclude.get(j).user == null){
  101.                                         if(jsParse.data.get(i).user.equalsIgnoreCase(jsParse.condition.exclude.get(j).user) || jsParse.condition.exclude.get(j).user == null){
  102.                                             flagExclude = true;
  103.                                             break;
  104.                                         }
  105.                                     }
  106.                                 }
  107.                             }
  108.                         }
  109.                     }
  110.                 }
  111.             }else{
  112.                 flagExclude = false;
  113.             }
  114.             System.out.println("flagInclude:  " + flagInclude + "  flagExclude:  " + flagExclude);
  115.             if(flagInclude == true && flagExclude == false){
  116.                 result r = new result( jsParse.data.get(i).disabled, jsParse.data.get(i).rating , jsParse.data.get(i).user, jsParse.data.get(i).name );
  117.                 res.add(r);
  118.             }
  119.         }
  120.         DataResult dataResult = new DataResult(res);
  121.         String jsParse2 = gson.toJson(dataResult.result);
  122.         String outJson = "{\"result\":" + jsParse2 + "}";
  123.         System.out.println(outJson);
  124.     }
  125. }

输出：“结果”：[{“禁用”：假，“评级”：20，“用户”：“mike@mail.com“，“名称”：“Ton 1”}]}

Gson

1条答案

按热度按时间
wtzytmuj

wtzytmuj1#

查看java Comparator 接口和 List 接口的 sort 方法。通过它们，您可以为您的'result'类创建自定义比较器（顺便说一句，类名应该始终以大写字母开头）。
您的案例的名称比较器示例。您将需要实现缺少的比较器，并根据您的规则集选择要使用的比较器。

  1. // Add me somewhere in your code
  2. public static class NameComparator implements Comparator<Result>
  3. {
  4.     @Override
  5.     public int compare(Result o1, Result o2) {
  6.         return o1.name.compareTo(o2.name);
  7.     }
  8. }
  10. // And in the block where you output the json structure:
  11. DataResult dataResult = new DataResult(res);
  12. DataResult.result.sort(new NameComparator()); // <-- I am new
  13. String jsParse2 = gson.toJson(dataResult.result);
  14. String outJson = "{\"result\":" + jsParse2 + "}";
  15. System.out.println(outJson);

希望这对你有帮助。

展开查看全部
赞(0）分享  回复(0）举报  2022-11-06
我来回答

相关问题

    查看更多

    热门标签

    更多
    JavaquerypythonNode开发语言requestUtil数据库Table后端算法LoggerMessageElementParser

    最新问答

    更多
    • 蜀ICP备13028337号-1 大数据知识库 https://www.saoniuhuo.com © All rights reserved
    • 本站内容来源互联网,如果侵犯您的权益请联系我们删除, 联系方式：448109455@qq.com