gson解析json

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gson解析json

public class Student {public String name;public int age;public boolean sex;}

Object转json串：

Gson gson = new Gson();String json = gson.toJson(student);

json转Object：

private static void parser2Object() {// json转换 为简单对象String json = "{'name':'张三','age':18,'sex':true}";Gson gson = new Gson();Student student = gson.fromJson(json, Student.class);//System.out.println(student);}

json转List：

private static void parser2List() {String json = "[{'name':'刘1','age':18,'sex':true},{'name':'刘2','age':19,'sex':false}]";Gson gson = new Gson();TypeToken<List<Student>> token = new com.google.gson.reflect.TypeToken<List<Student>>() {};//List<Student> stus = gson.fromJson(json, token.getType());}

json转Map：

private static void parser2Map() {String json = "[{'name':'刘1','age':18,'sex':true},{'name':'刘2','age':19,'sex':false}]";Gson gson = new Gson();TypeToken<Map<String, Student>> token = new com.google.gson.reflect.TypeToken<Map<String, Student>>() {};Map<String, Student> stus = gson.fromJson(json, token.getType());}

json先节点解析，在转换：

private static void parser2() {// 节点解析String json = "{'status':200,'data':{'name':'张三','age':18,'sex':true}}";// 1.获得 解析者JsonParser parser = new JsonParser();// 2.获得 根节点元素JsonElement element = parser.parse(json);// 3.根据 文档判断根节点属于 什么类型的 Gson节点对象JsonObject root = element.getAsJsonObject();// 4. 取得 节点 下 的某个节点的 valueJsonPrimitive flagJson = root.getAsJsonPrimitive("status");int asInt = flagJson.getAsInt();// 请求返回判断JsonObject dataJson = root.getAsJsonObject("data");// (JsonElement, Class<T>) element->obj/arr  Student student = new Gson().fromJson(dataJson, Student.class);root.getAsJsonArray();}

嵌套类解析：

public class NewsBean {public int code;public ArrayList<NewsMenuData> data;public class NewsMenuData{public String id;public String title;public ArrayList<NewsTabData> children;// toString...}public class NewsTabData {public String id;public String title;// toString...}// toString...}

{    'code': 1,    'data': [        {            'id': 1,            'title': 'news',            'children': [                {                    'id': 1,                    'title': 'dataTitle'                },                {                    'id': 1,                    'title': 'dataTitle'                }            ]        },        {            'id': 2,            'title': 'news',            'children': [                {                    'id': 1,                    'title': 'dataTitle'                },                {                    'id': 1,                    'title': 'dataTitle'                }            ]        }    ]}

String json = "{'code':1,'data':[{'id':1,'title':'news','children':[{'id':1,'title':'dataTitle'},{'id':2,'title':'news','children':[{'id':1,'title':'dataTitle'}]},{'id':1,'title':'news','children':[{'id':2,'title':'dataTitle'},{'id':2,'title':'news','children':[{'id':1,'title':'dataTitle'}]}]}";Gson gson = new Gson();NewsBean student = gson.fromJson(json, NewsBean.class);//

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