JSON #json #資料格式 #xml #api #json指定 #json問題 #json重新 #json禁用 #引用json

JSON:

也是一個标記語言，他的好處是解析比xml友善的多

JSON：

需要引入一個，json包

簡單的取值與指派

package com.kaige123.json;

import org.json.JSONObject;

public class Test {

    public static void main(String[] args) {

        Student student=new Student();//建立對象

        student.setName("李四");//給對象指派
        student.setAddress("湖南");
        student.setAge(12);
        student.setEmail("[email protected]");

        JSONObject jsonObject=new JSONObject(student);//将對象的值交給JSONObject對象
        System.out.println(jsonObject.getString("name"));//可以通過指派的對象來取對象中的值

        String jsonStr=jsonObject.toString();//将對象中的json值給 jsonStr
        jsonObject=new JSONObject(jsonStr);//将值交給JSONObject對象
        System.out.println(jsonObject.getString("name"));//通過對象中的方法來取值


    }
}

JSON：json的解析原理

package com.kaige123.json;

import org.json.JSONObject;

public class TestJieXi {

    public static void main(String[] args) {

        String josnStr="{\"address\":\"湖南\",\"name\":\"李四\",\"age\":12,\"email\":\"[email protected]\"}";//将值交給字元串


        JSONObject jsonObject=new JSONObject(josnStr);//将值交給JSONObject對象

        System.out.println(jsonObject.getString("name"));//通過方法解析對象，拿到對象中的值
        System.out.println(jsonObject.getString("address"));
        System.out.println(jsonObject.getString("email"));
        System.out.println(jsonObject.getInt("age"));


    }
}

JSON：對象嵌套

public class Dog {

    private String name;
    private float age;
}
package com.kaige123.json;

public class Student {
    
    private String name;
    private String address;
    private String email;
    private int age;
    private Dog dog;
}

嵌套對象取值：

package com.kaige123.json;

import org.json.JSONObject;

public class TestStudentDog {

    public static void main(String[] args) {

        Student student = new Student();
        student.setName("張三");
        student.setEmail("[email protected]");
        student.setAge(12);
        student.setAddress("湖南郴州");
        Dog dog = new Dog();
        dog.setName("旺财");
        dog.setAge(12);
        student.setDog(dog);

        JSONObject jsonObject = new JSONObject(student);

        System.out.println(jsonObject.toString());
        //JSONObject student的值{"address":"湖南郴州","name":"張三","dog":{"name":"旺财","age":12},"email":"[email protected]","age":12}

        System.out.println("name:" + jsonObject.getString("name"));
        JSONObject jsonObject1 = jsonObject.getJSONObject("dog");
        //那到jsonObject對象 裡面是student對象 再通過方法拿到dog對象交給jsonObject1
        System.out.println(jsonObject1.getString("name"));
        //再通過jsonObject1拿到dog中的屬性

    }
}

JSON：數組對象取值

package com.kaige123.json;

import org.json.JSONArray;
import org.json.JSONObject;

public class TestStudentDogArray {

    public static void main(String[] args) {
        Student[] students=new Student[2];//建立對象數組

        Student student=new Student();
        student.setName("張三");
        student.setEmail("[email protected]");
        student.setAge(12);
        student.setAddress("湖南郴州");
        Dog dog=new Dog();
        dog.setName("旺财");
        dog.setAge(12);
        student.setDog(dog);
        students[0]=student;//給數組對象指派

        student=new Student();
        student.setName("張三1");
        student.setEmail("[email protected]");
        student.setAge(14);
        student.setAddress("湖南郴州1");
        dog=new Dog();
        dog.setName("旺财1");
        dog.setAge(121);
        student.setDog(dog);
        students[1]=student;//給數組對象指派

        JSONArray jsonObject=new JSONArray(students);
        //對象的接口 JSONArray 将數組對象交給JSONArray接口
        System.out.println(jsonObject);

        String jsonStr=jsonObject.toString();
        JSONArray jsonArray=new JSONArray(jsonStr);
//[{"address":"湖南郴州","name":"張三","dog":{"name":"旺财","age":12},"age":12,"email":"[email protected]"},
// {"address":"湖南郴州1","name":"張三1","dog":{"name":"旺财1","age":121},"age":14,"email":"[email protected]"}] 兩個對象值
        for(int i=0;i<jsonArray.length();i++){//通過jsonArray.length()方法拿到數組長度
            JSONObject jsonObject1=jsonArray.getJSONObject(i);
            //json取值接口JSONObject 通過數組對象中的jsonArray.getJSONObject(i)方法來獲得數組中的一個個對象
            System.out.println(jsonObject1.getString("name"));
            System.out.println(jsonObject1.getString("address"));
            System.out.println(jsonObject1.getString("email"));
            System.out.println(jsonObject1.getInt("age"));
            JSONObject jsonObject2=jsonObject1.getJSONObject("dog");
            //嵌套對象取值通過jsonObject1嵌套對象中的jsonObject1.getJSONObject("dog")方法來取得被嵌套對象的資料
            System.out.println("----Dog-----");
            System.out.println(jsonObject2.getString("name"));//再通過方法取值
            System.out.println(jsonObject2.getFloat("age"));
            System.out.println("----Dog-----");
        }
    }
}

JSON：集合對象取值

package com.kaige123.json;

import org.json.JSONArray;
import org.json.JSONObject;

import java.util.Vector;

public class TestStudentDogVector {

    public static void main(String[] args) {

        Vector vector = new Vector();
        //建立集合對象
        //集合比數組要厲害 因為可以添加很多個對象  數組是控制長度的儲存器

        Student student = new Student();
        student.setName("張三");
        student.setEmail("[email protected]");
        student.setAge(12);
        student.setAddress("湖南郴州");
        Dog dog = new Dog();
        dog.setName("旺财");
        dog.setAge(12);
        student.setDog(dog);
        vector.add(student);//将對象交給集合

        student = new Student();
        student.setName("張三1");
        student.setEmail("[email protected]");
        student.setAge(14);
        student.setAddress("湖南郴州1");
        dog = new Dog();
        dog.setName("旺财1");
        dog.setAge(121);
        student.setDog(dog);
        vector.add(student);//将對象交給集合

        JSONArray jsonObject = new JSONArray(vector);//建立接受集合對象
        for (int i = 0; i < jsonObject.length(); i++) {
            JSONObject jsonObject1 = jsonObject.getJSONObject(i);//将集合中的對象給 JSONObject對象
            System.out.println(jsonObject1.getString("name"));//通過JSONObject對象來拿去對象中的值
            System.out.println(jsonObject1.getString("address"));
            System.out.println(jsonObject1.getString("email"));
            System.out.println(jsonObject1.getInt("age"));
            JSONObject jsonObject2 = jsonObject1.getJSONObject("dog");
            //嵌套對象取值通過jsonObject1嵌套對象中的jsonObject1.getJSONObject("dog")方法來取得被嵌套對象的資料
            //将值叫給JSONObject對象再通過對象來拿去對象中的值
            System.out.println("----Dog-----");
            System.out.println(jsonObject2.getString("name"));
            System.out.println(jsonObject2.getFloat("age"));
            System.out.println("----Dog-----");
        }
    }
}

JSON：中的忽略與添加

package com.kaige123.json;

import org.json.JSONObject;
import org.json.JSONTokener;

public class TestStudentDogQuChu {

    public static void main(String[] args) {

        Student student=new Student();
        student.setName("張三");
        student.setEmail("[email protected]");
        student.setAge(12);
        student.setAddress("湖南郴州");
        Dog dog=new Dog();
        dog.setName("旺财");
        dog.setAge(12);
        student.setDog(dog);

        JSONObject jsonObject=new JSONObject(student);
        jsonObject.remove("email");//取出對象中的某一行資料、每個JSON插件中的忽略代碼都不一樣
        jsonObject.remove("address");
        jsonObject.put("phone","13900000000");//添加一行資料 隻是這個對象
        System.out.println(jsonObject.toString());
    }
}

JSON中的API查詢

public class URLConn {
//連接配接代碼
    public static String openAPI(String url, String charset) {
        String body = "";
        try {
            URLConnection conn = new URL(url).openConnection();
            conn.connect();
            conn.setReadTimeout(50000);//讀取逾時
            BufferedReader bufferedReader =
                    new BufferedReader(new InputStreamReader(
                            conn.getInputStream(), charset));
            StringBuffer stringBuffer = new StringBuffer();
            String line = null;
            while ((line = bufferedReader.readLine()) != null) {
                stringBuffer.append(line);
            }
            bufferedReader.close();
            return stringBuffer.toString();
        } catch (Exception e) {
            System.out.println("通路出錯");
            e.printStackTrace();
        }
        return body;

    }
}

package com.kaige123.json;

import org.json.JSONObject;

public class TestAPIJson {

    public static void main(String[] args) {
     String body=URLConn.openAPI(
              "http://v.juhe.cn/sms/send?mobile=&tpl_id=52299&tpl_value=%23code%23%3D&key=",//請求執行個體
               "UTF-8");//編碼格式
      System.out.println(body);//列印結果
    }
}

JSON

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