pom.xml

      
     
      com.google.code.gson
       
     
      gson
       
     
      2.7
     
    

 编写GsonUtils类

//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package util;import com.google.gson.Gson;import com.google.gson.GsonBuilder;import com.google.gson.reflect.TypeToken;import java.lang.reflect.Type;import java.util.Collection;import java.util.Enumeration;import java.util.Iterator;public class GsonUtils {    private static final String EMPTY_JSON = "{}";    private static final String EMPTY_JSON_ARRAY = "[]";    private static final String DEFAULT_DATE_PATTERN = "yyyy-MM-dd HH:mm:ss";    public GsonUtils() {    }    public static String toJson(Object target) {        return toJson(target, (Type)null, (String)null);    }    public static String toJson(Object target, Type targetType, String datePattern) {        if(target == null) {            return EMPTY_JSON;        } else {            GsonBuilder builder = new GsonBuilder();            if(datePattern == null || datePattern.length() < 1) {                datePattern = DEFAULT_DATE_PATTERN;            }            builder.setDateFormat(datePattern);            Gson gson = builder.create();            String result = EMPTY_JSON;            try {                if(targetType == null) {                    result = gson.toJson(target);                } else {                    result = gson.toJson(target, targetType);                }            } catch (Exception var7) {                if(target instanceof Collection || target instanceof Iterator || target instanceof Enumeration || target.getClass().isArray()) {                    result = EMPTY_JSON_ARRAY;                }            }            return result;        }    }    public static String toJson(Object target, Type targetType) {        return toJson(target, targetType, (String)null);    }    public static 
    
      T fromJson(String json, TypeToken
     
       token, String datePattern) {        if(json != null && json.length() >= 1) {            GsonBuilder builder = new GsonBuilder();            if(datePattern == null || datePattern.length() < 1) {                datePattern = DEFAULT_DATE_PATTERN;            }            builder.setDateFormat(datePattern);            Gson gson = builder.create();            try {                return gson.fromJson(json, token.getType());            } catch (Exception var6) {                return null;            }        } else {            return null;        }    }    public static Object fromJson(String json, Type type, String datePattern) {        if(json != null && json.length() >= 1) {            GsonBuilder builder = new GsonBuilder();            if(datePattern == null || datePattern.length() < 1) {                datePattern = DEFAULT_DATE_PATTERN;            }            builder.setDateFormat(datePattern);            Gson gson = builder.create();            try {                return gson.fromJson(json, type);            } catch (Exception var6) {                return null;            }        } else {            return null;        }    }    public static Object fromJson(String json, Type type) {        return fromJson(json, (Type)type, (String)null);    }    public static 
      
        T fromJson(String json, TypeToken
       
         token) {        return (T)fromJson(json, (TypeToken)token, (String)null);    }    public static 
        
          T fromJson(String json, Class
         
           clazz, String datePattern) { if(json != null && json.length() >= 1) { GsonBuilder builder = new GsonBuilder(); if(datePattern == null || datePattern.length() < 1) { datePattern = DEFAULT_DATE_PATTERN; } builder.setDateFormat(datePattern); Gson gson = builder.create(); try { return gson.fromJson(json, clazz); } catch (Exception var6) { return null; } } else { return null; } } public static 
          
            T fromJson(String json, Class
           
             clazz) { return (T)fromJson(json, (Class)clazz, (String)null); }}
           
          
         
        
       
      
     
    

编写test测试类

public class Test {    class Model{        private String id;        private String name;        public String getId() {            return id;        }        public void setId(String id) {            this.id = id;        }        public String getName() {            return name;        }        public void setName(String name) {            this.name = name;        }        public String toString(){            return "id="+this.id+";name="+this.name;        }    }    public static void main(String[] args) {        Map
    
      map = new HashMap
     
      ();        map.put("1",1);        map.put("2",2);        map.put("3",3);        System.out.println(GsonUtils.toJson(map));        List
      
        listTojson = new ArrayList
       
        ();        Test.Model model1 = new Test().new Model();        model1.setId("1");        model1.setName("张三");        Test.Model model2 = new Test().new Model();        model2.setId("2");        model2.setName("李四");        listTojson.add(model1);        listTojson.add(model2);        String json = GsonUtils.toJson(listTojson);        System.out.println("json="+json);        List
        
          modelList = (List
         
          )GsonUtils.fromJson(json,new TypeToken
          
           
            >(){}.getType()); System.out.println("modelList="+modelList.toString()); }}