gson的@Expose注解和@SerializedName注解

最新推荐文章于 2025-06-24 08:46:05 发布

最新推荐文章于 2025-06-24 08:46:05 发布 · 74 阅读

本文详细介绍了Gson中@Expose和@SerializedName注解的用法。@Expose控制字段是否参与序列化过程，可通过属性定制序列化行为。@SerializedName用于指定序列化后的字段名。文章通过实例展示了如何使用GsonBuilder排除未标记@Expose的字段。

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gson的@Expose注解和@SerializedName注解

@Expose标签的2个属性.` 1.1<a href="http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/annotations/Expose.html#deserialize()">deserialize</a>`(boolean) 反序列化默认 true
1.2`serialize` (boolean) 序列化默认 true

 使用newGsonBuilder().excludeFieldsWithoutExposeAnnotation().create();创建Gson对象，没有@Expose注释的属性将不会被序列化

publicclassUser{<blockquote style="line-height:25px; margin:auto 0px auto 35px; color:rgb(51,51,51); font-size:1em"> <div style="line-height:25px"> @Expose privateStringusername; @Expose(serialize=false) privateintage; privateList<String>list; publicUser(Stringusername,intage){ super(); this.username=username; this.age=age; } publicStringgetUsername(){ returnusername; } publicvoidsetUsername(Stringusername){ this.username=username; } publicintgetAge(){ returnage; } publicvoidsetAge(intage){ this.age=age; } publicList<String>getList(){ returnlist; } publicvoidsetList(List<String>list){ this.list=list; } publicstaticvoidmain(String[]args){ Useruser=newUser("lemon",27); List<String>list=newArrayList<String>(); list.add("l1"); list.add("l2"); user.setList(list); Gsong1=newGson(); //使用newGson(); System.out.println(g1.toJson(user));//{"username":"lemon","age":27,"list":["l1","l2"]} //使用newGsonBuilder().excludeFieldsWithoutExposeAnnotation().create(); Gsong2=newGsonBuilder().excludeFieldsWithoutExposeAnnotation().create(); System.out.println(g2.toJson(user));//{"username":"lemon"} </div> </blockquote> <div style="line-height:25px; color:rgb(51,51,51)"> } </div> <div style="line-height:25px; color:rgb(51,51,51)"> } </div> 2.使用@SerializedName标签定义属性序列化后的名字 <blockquote style="line-height:25px; margin:auto 0px auto 35px; color:rgb(51,51,51); font-size:1em"> @Expose @SerializedName("name") privateStringusername; </blockquote> <blockquote style="line-height:25px; margin:auto 0px auto 35px; font-size:1em"> <div style="line-height:25px"> publicstaticvoidmain(String[]args){ <blockquote style="line-height:25px; margin:auto 0px auto 35px; color:rgb(51,51,51); font-size:1em"> Useruser=newUser("lemon",27); List<String>list=newArrayList<String>(); list.add("l1"); list.add("l2"); user.setList(list); Gsong1=newGson(); //使用newGson(); //{"name":"lemon","age":27,"list":["l1","l2"]} System.out.println(g1.toJson(user)); //使用newGsonBuilder().excludeFieldsWithoutExposeAnnotation().create(); Gsong2=newGsonBuilder().excludeFieldsWithoutExposeAnnotation().create(); //{"name":"lemon"} System.out.println(g2.toJson(user)); </blockquote> } </div> </blockquote>