Json转换利器Gson之实例三-Map处理(上)
- 作者 firedragonpzy
- 6 九月, 2015
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Map的存储结构式Key/Value形式,Key 和 Value可以是普通类型,也可以是自己写的JavaBean(本文),还可以是带有泛型的List(下一篇博客).本例中您要重点看如何将Json转回为普通JavaBean对象时TypeToken的定义.
实体类:
public class Point { private int x; private int y; public Point(int x, int y) { this.x = x; this.y = y; } public int getX() { return x; } public void setX(int x) { this.x = x; } public int getY() { return y; } public void setY(int y) { this.y = y; } @Override public String toString() { return "Point [x=" + x + ", y=" + y + "]"; } }
测试类:
import java.util.LinkedHashMap; import java.util.Map; import com.google.gson.Gson; import com.google.gson.GsonBuilder; import com.google.gson.reflect.TypeToken; public class GsonTest3 { public static void main(String[] args) { Gson gson = new GsonBuilder().enableComplexMapKeySerialization() .create(); Map<point , String> map1 = new LinkedHashMap</point><point , String>();// 使用LinkedHashMap将结果按先进先出顺序排列 map1.put(new Point(5, 6), "a"); map1.put(new Point(8, 8), "b"); String s = gson.toJson(map1); System.out.println(s);// 结果:[[{"x":5,"y":6},"a"],[{"x":8,"y":8},"b"]] Map</point><point , String> retMap = gson.fromJson(s, new TypeToken<map <Point, String>>() { }.getType()); for (Point p : retMap.keySet()) { System.out.println("key:" + p + " values:" + retMap.get(p)); } System.out.println(retMap); System.out.println("----------------------------------"); Map<string , Point> map2 = new LinkedHashMap</string><string , Point>(); map2.put("a", new Point(3, 4)); map2.put("b", new Point(5, 6)); String s2 = gson.toJson(map2); System.out.println(s2); Map</string><string , Point> retMap2 = gson.fromJson(s2, new TypeToken<map <String, Point>>() { }.getType()); for (String key : retMap2.keySet()) { System.out.println("key:" + key + " values:" + retMap2.get(key)); } } }
结果:
[[{"x":5,"y":6},"a"],[{"x":8,"y":8},"b"]]
key:Point [x=5, y=6] values:a
key:Point [x=8, y=8] values:b
{Point [x=5, y=6]=a, Point [x=8, y=8]=b}
———————————-
{“a”:{“x”:3,”y”:4},”b”:{“x”:5,”y”:6}}
key:a values:Point [x=3, y=4]
key:b values:Point [x=5, y=6]
- Json转换利器Gson之实例一-简单对象转化和带泛型的List转化
- Json转换利器Gson之实例二-Gson注解和GsonBuilder
- Json转换利器Gson之实例三-Map处理(上)
- Json转换利器Gson之实例四-Map处理(下)
- Json转换利器Gson之实例五-实际开发中的特殊需求处理
- Json转换利器Gson之实例六-注册TypeAdapter及处理Enum类型