数据解析(二):Gson解析

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一.Gson通常的用法有四种

1.把java对象转换成json字符串(序列化)

  public void JavaToJson() {        Student stu = new Student("李毅", 23);        Gson gson = new Gson();        String s = gson.toJson(stu);        System.out.println("javaToJSon:" + s);        //I/System.out: javaToJSon:{"name":"李毅","age":23}    }

2.把集合对象转换成json字符串(序列化)

 public void ListToJson() {        ArrayList<Student> data = new ArrayList<>();        for (int i = 0; i < 3; i++) {            Student stu = new Student("N" + i, i);            data.add(stu);        }        Gson gson = new Gson();        String s = gson.toJson(data);        System.out.println("listToJSON:" + s);        //System.out: listToJSON:[{"name":"N0","age":0},{"name":"N1","age":1},{"name":"N2","age":2}]    }

3.把json字符串转换成javaBean对象(反序列化)

public void jsonToJava() {        Student stu = new Student("李毅", 23);        Gson gson = new Gson();        String json = gson.toJson(stu);        Student student = gson.fromJson(json, Student.class);        System.out.println("jsonToJava:" + student.toString());        //I/System.out: listToJSON:[{"name":"N0","age":0},{"name":"N1","age":1},{"name":"N2","age":2}]    }

4.把json字符串转换成集合对象(反序列化)

  public void JsonToList() {        ArrayList<Student> data = new ArrayList<>();        for (int i = 0; i < 3; i++) {            Student stu = new Student("N" + i, i);            data.add(stu);        }        Gson gson = new Gson();        String json = gson.toJson(data);        ArrayList<Student> coll = gson.fromJson(json, new TypeToken<ArrayList<Student>>() {        }.getType());        System.out.println("jsonToList:" + coll.size());        // I/System.out: jsonToList:3

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