json数据文件生成

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随着现在数据量的不断增大，json格式的渐渐替代了XML文件，笔者正好在工作中碰到了类似于这样的事情，所以我就在这里分享一下自己写出来的一个简单的案例。
在生成之前，如果你对json一无所知，我推荐去官网看一下帮助文档json官网
优点：易于人的阅读和编写，易于程序解析生产
数据结构
Object {}对象：键值对的结构，key必须是string类型、vlue为任何基本类型和数据结构
Array[]数组：“，”标示分隔符
基本类型
string、number、true、false、null
生成json文件有三种构建方法，具体喜欢哪一种各位自己尝试。

1. 通过json构建

1.准备json爪哇包

• org.json.jar
  找不到的可以去笔者的主页资源里面下载，点击此链接也可以跳转json包

2.准备项目
1.创建一个maven项目，方便代码的管理

2.在项目的pom.xml文件中声明json.jar文件包


//声明json文件
<dependencies>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20090211</version>
</dependency>
</dependencies>

3.创建class文件

public class JsonObjectSample {
    public static void main(String[] args) {
        JSONObject();
    }
//通过json构建
    private static void JSONObject() {
        JSONObject zuchuanmalong = new JSONObject();  //创建json一个对象
        Object nullobj = null;    //跳过编译器的赋值
        //需要加入捕获异常
        try {
            //以下进行赋值
            zuchuanmalong.put("name", "祖传码农");
            zuchuanmalong.put("age","20");
            zuchuanmalong.put("birthday", "1997-08-09");
            zuchuanmalong.put("school", "家里蹲");
            zuchuanmalong.put("major", new String[] {"敲代码","打篮球"});
            zuchuanmalong.put("has_girlfiend", true);
            zuchuanmalong.put("car", nullobj);
            zuchuanmalong.put("house", nullobj);
            zuchuanmalong.put("comment", "这是我的第一个json文件");
            System.out.println(zuchuanmalong.toString());  //输出当前json
        } catch (JSONException e) {
            e.printStackTrace();
        }
}

输出即可看到结果：`{"birthday":"1997-08-09","major":["敲代码","打篮球"],"school":"家里蹲","car":null,"name":"祖传码农","has_girlfriend":true,"house":null,"age":20}`

2.使用Map

    public class JsonObjectSample {
    public static void main(String[] args) {
        createJsonByMap();
    }
    private static void createJsonByMap() {
        Map<String, Object> zuchuanmalong = new HashMap<String, Object>();
        Object nullobj = null;    //跳过编译器的赋值
            //以下进行赋值
            zuchuanmalong.put("name", "祖传码农");
            zuchuanmalong.put("age","20");
            zuchuanmalong.put("birthday", "1997-08-09");
            zuchuanmalong.put("school", "家里蹲");
            zuchuanmalong.put("major", new String[] {"敲代码","打篮球"});
            zuchuanmalong.put("has_girlfiend", true);
            zuchuanmalong.put("car", nullobj);
            zuchuanmalong.put("house", nullobj);
            zuchuanmalong.put("comment", "这是我的第一个json文件");
            System.out.println(new JSONObject(zuchuanmalong).toString());
    }
}

输出即可看到结果：`{"birthday":"1997-08-09","major":["敲代码","打篮球"],"school":"家里蹲","car":null,"name":"祖传码农","has_girlfriend":true,"house":null,"age":20}`

3.通过JAVABean来生成json对象

需要创建一个实体类来格式化属性

//生成实体类
public class User {
    private String name;
    private String school;
    private boolean has_girlfriend;
    private double age;
    private Object car;
    private Object house;
    private String[] major;
    private String birthday;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSchool() {
        return school;
    }
    public void setSchool(String school) {
        this.school = school;
    }
    public boolean isHas_girlfriend() {
        return has_girlfriend;
    }
    public void setHas_girlfriend(boolean has_girlfriend) {
        this.has_girlfriend = has_girlfriend;
    }
    public double getAge() {
        return age;
    }
    public void setAge(double age) {
        this.age = age;
    }
    public Object getCar() {
        return car;
    }
    public void setCar(Object car) {
        this.car = car;
    }
    public Object getHouse() {
        return house;
    }
    public void setHouse(Object house) {
        this.house = house;
    }
    public String[] getMajor() {
        return major;
    }
    public void setMajor(String[] major) {
        this.major = major;
    }
    public String getBirthday() {
        return birthday;
    }
    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }


}

public class JsonObjectSample {
    public static void main(String[] args) {
        createJsonByBean();
    }
    //通过JAVABean来生成json对象
    private static void createJsonByBean() {
        User zuchuanmalong = new User();
        //以下进行赋值
        zuchuanmalong.setName( "祖传码农");
        zuchuanmalong.setAge(20);
        zuchuanmalong.setBirthday( "1997-08-09");
        zuchuanmalong.setSchool("家里蹲");
        zuchuanmalong.setMajor(new String[] {"敲代码","打篮球"});
        zuchuanmalong.setHas_girlfriend( true);
        zuchuanmalong.setCar(null);
        zuchuanmalong.setHouse(null);
        System.out.println(new JSONObject(zuchuanmalong));
    }
}

输出即可看到结果：`{"birthday":"1997-08-09","major":["敲代码","打篮球"],"school":"家里蹲","car":null,"name":"祖传码农","has_girlfriend":true,"house":null,"age":20}`