Android中通过Gson进行json解析

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编写不易，如有转载，请声明出处: 梦回河口：http://blog.csdn.net/zxc514257857/article/details/60490002

前言

本篇博客大致围绕以下几个内容讲解：

Gson及GsonFormat的基本配置及使用
Gson解析基本数据类型和POJO类型
Gson解析Array类型
属性重命名 @SerializedName 注解的使用

Gson及GsonFormat的基本配置及使用

使用Gson需要在project的build.gradle下添加：

compile 'com.google.code.gson:gson:2.4'

使用GsonFormat需要通过ctrl+alt+s调处Settings，并找到plugins，选择GsonFormat插件进行安装。如果需要使用JavaBean类，通过alt+insert调出GsonFormat插件使用

Gson解析、生成基本数据类型和POJO类型

Gson解析基本数据类型

// 解析Gson gson = new Gson();int i = gson.fromJson("100", int.class);                //100double d = gson.fromJson("\"99.99\"", double.class);    //99.99boolean b = gson.fromJson("true", boolean.class);       // trueString str = gson.fromJson("String", String.class);     // String----------------------------------------------------------------------------------------// 生成Gson gson = new Gson();String jsonInt = gson.toJson(100);                      // 100String jsonDouble = gson.toJson(99.99);                 // 99.99String jsonBoolean = gson.toJson(false);                // falseString jsonString = gson.toJson("String");              //"String"

Gson解析POJO类型

// User JavaBean类public class User {    private String name;    private int age;    private String address;    public User(String name, int age, String address) {        this.name = name;        this.age = age;        this.address = address;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public String getAddress() {        return address;    }    public void setAddress(String address) {        this.address = address;    }    @Override    public String toString() {        return "User{" +                "name='" + name + '\'' +                ", age=" + age +                ", address='" + address + '\'' +                '}';    }}----------------------------------------------------------------------------------------// 解析Gson gson = new Gson();String str = "{\"age\":24,\"address\":\"杭州\",\"name\":\"zhr\"}";User user = gson.fromJson(str , User.class);int age = user .getAge();String name = user .getName();String address = user .getAddress();// age:24,name:zhr,address:杭州Log.i(TAG , "age:" + age +",name:" + name + ",address:" + address);----------------------------------------------------------------------------------------// 生成Gson gson = new Gson();User user = new User("zhr" , 24 , "杭州");String str = gson.toJson(user );// str:{"address":"杭州","age":24,"name":"zhr"}Log.i(TAG , "str" + str);

Gson解析Array类型

String str = "[\"00\",\"11\",\"22\",\"33\",\"44\",\"55\",\"66\",\"77\",\"88\",\"99\",\"00\",\"11\",\"22\",\"33\",\"44\",\"55\",\"66\",\"77\",\"88\",\"99\"]";

Gson解析数组类型

String[] strings = gson.fromJson(str , String[].class);// strings:[00, 11, 22, 33, 44, 55, 66, 77, 88, 99, 00, 11, 22, 33, 44, 55, 66, 77, 88, 99]Log.i(TAG , "strings:" + Arrays.toString(strings));

Gson解析集合类型

List<String> list = gson.fromJson(s3, new TypeToken<List<String>>(){}.getType());// list:[00, 11, 22, 33, 44, 55, 66, 77, 88, 99, 00, 11, 22, 33, 44, 55, 66, 77, 88, 99]Log.i(TAG , "list:" + list.toString());

使用gson.fromJson(json , )的时候，集合类型要在bean上包一个list，对象类型直接使用.class即可

属性重命名 @SerializedName 注解的使用

// PriceBean JavaBean类(注意这里通过@SerializedName注解，将is_forsale改成了isForsale)public class PriceBean {    private String id;    @SerializedName("is_forsale")    private String isForsale;    private String name;    public String getId() {        return id;    }    public void setId(String id) {        this.id = id;    }    public String getIsForsale() {        return isForsale;    }    public void setIsForsale(String isForsale) {        this.isForsale = isForsale;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    @Override    public String toString() {        return "PriceBean{" +                "id='" + id + '\'' +                ", isForsale='" + isForsale + '\'' +                ", name='" + name + '\'' +                '}';    }}----------------------------------------------------------------------------------------// 解析String jsonArray = "[\n" +        "    {\n" +        "        \"id\": \"250\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"鲢鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"629\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"鳙鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"603\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"草鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"180\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"鲤鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"138\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"鲫鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"631\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"河蟹\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"685\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"冻带鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"142\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"鲳鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"136\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"鲈鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"181\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"大白鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"957\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"白鲢\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"359\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"墨鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"133\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"鳊鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"231\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"泥鳅\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"137\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"黄鳝\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"131\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"黑鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"009\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"银鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"050\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"秋刀鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"001\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"武昌鱼\"\n" +        "    },\n" +        "    {\n" +        "        \"id\": \"100\",\n" +        "        \"is_forsale\": \"0\",\n" +        "        \"name\": \"鳇鱼\"\n" +        "    }\n" +        "]";List<PriceBean> mList = gson.fromJson(jsonArray, new TypeToken<List<PriceBean>>(){}.getType());        // mList:[PriceBean{id='250', isForsale='0', name='鲢鱼'}, PriceBean{id='629', isForsale='0', name='鳙鱼'}, PriceBean{id='603', isForsale='0', name='草鱼'}, PriceBean{id='180', isForsale='0', name='鲤鱼'}, PriceBean{id='138', isForsale='0', name='鲫鱼'}, PriceBean{id='631', isForsale='0', name='河蟹'}, PriceBean{id='685', isForsale='0', name='带鱼'}, PriceBean{id='142', isForsale='0', name='鲳鱼'}, PriceBean{id='136', isForsale='0', name='鲈鱼'}, PriceBean{id='181', isForsale='0', name='白鱼'}, PriceBean{id='957', isForsale='0', name='白鲢'}, PriceBean{id='359', isForsale='0', name='墨鱼'}, PriceBean{id='133', isForsale='0', name='鳊鱼'}, PriceBean{id='231', isForsale='0', name='泥鳅'}, PriceBean{id='137', isForsale='0', name='黄鳝'}, PriceBean{id='131', isForsale='0', name='黑鱼'}, PriceBean{id='009', isForsale='0', name='银鱼'}, PriceBean{id='050', isForsale='0', name='刀鱼'}, PriceBean{id='001', isForsale='0', name='河豚'}, PriceBean{id='100', isForsale='0', name='鳇鱼'}]        Log.i(TAG , "mList:" + mList);

注意：在PriceBean类中，通过@SerializedName注解，将is_forsale改成了isForsale，这样很好的保留了前端、后台、Android/Php、JS/Java之间各自的命名习惯

———-原文参考自：http://www.jianshu.com/p/e740196225a4———-

———-因本人才疏学浅，如博客或Demo中有错误的地方请大家随意指出，与大家一起讨论，共同进步，谢谢！———-

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