Json、JavaBean、Map、XML之间的互转

思路是JavaBean、Map、XML都可以用工具类很简单的转换为Json，进而实现互相转换

1.Map、XML与Json互转

mvn依赖

<dependency>
        <groupId>org.json</groupId>
        <artifactId>json</artifactId>
        <version>20171018</version>
 </dependency>

entity

public class Student {

    private String name;
    private String sex;
    private int age;

}

import org.json.JSONObject;
import org.json.XML;

import java.util.HashMap;
import java.util.Map;

public class JsonUtil {

    public static String JsonToXml(String json){

        JSONObject jsonObject = new JSONObject(json);
        return XML.toString(jsonObject) ;
    }

    public static String XmlToJson(String xml){

        JSONObject jsonObject = XML.toJSONObject(xml);
        return jsonObject.toString();
    }

    public static String MapToJson(Map map){

        JSONObject jsonObject = new JSONObject(map);
        return jsonObject.toString();
    }

    public static Map JsonToMap(String json){

        JSONObject jsonObject = new JSONObject(json);
        return jsonObject.toMap();
    }

    public static String BeanToJson(Object object){

        JSONObject jsonObject = new JSONObject(object);
        return jsonObject.toString();
    }

    public static void main(String[] args) {

        Map map = new HashMap();
        map.put("name","小明");
        map.put("sex","男");
        map.put("age",10);

        String json = MapToJson(map);
        System.out.println(json);

        Map map1 = JsonToMap(json);
        System.out.println(map1);

        String xml = JsonToXml(json);
        System.out.println(xml);

        String json1 = XmlToJson(xml);
        System.out.println(json1);

        // bean to json
        Student student = new Student("小红","女",20);
        String json2 = BeanToJson(student);
        System.out.println(json2);
    }
}

执行结果

{"name":"小明","age":10,"sex":"男"}
{sex=男, name=小明, age=10}
<sex>男</sex><name>小明</name><age>10</age>
{"sex":"男","name":"小明","age":10}
{"sex":"女","name":"小红","age":20}

2.JavaBean与Json互转

mvn依赖

<dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.9</version>
</dependency>

import com.alibaba.fastjson.JSON;

public class JsonUtil2 {

    public static String BeanToJson(Object object){

        String json = JSON.toJSONString(object);
        return json;
    }

    public static <T>T JsonToBean(String json,Class<T> clazz){

        return JSON.parseObject(json,clazz);
    }

    public static void main(String[] args) {

        Student student = new Student("小张","男",28);
        String json = BeanToJson(student);
        System.out.println(json);
        Student student1 = JsonToBean(json,Student.class);
        System.out.println(student1);
    }
}

执行结果

{"age":28,"name":"小张","sex":"男"}
Student{name='小张', sex='男', age=28}

3.常用的json工具类除了上面两个以外还有jackson

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.9.8</version>
</dependency>