【JAVA】JSONObject的用法

配置

        <!--json-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>

        <!-- JSONObject对象依赖的jar包 -->
        <dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>2.4</version>
            <classifier>jdk15</classifier>  <!--jdk15并不是jdk版本，而是net.sf.json-lib的一个版本，对应的jdk版本是jdk1.5以上的版本-->
        </dependency>
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.6</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>commons-collections</groupId>
            <artifactId>commons-collections</artifactId>
            <version>3.2.1</version>
        </dependency>
        <dependency>
            <groupId>net.sf.ezmorph</groupId>
            <artifactId>ezmorph</artifactId>
            <version>1.0.6</version>
        </dependency>
        <dependency>
            <groupId>commons-beanutils</groupId>
            <artifactId>commons-beanutils</artifactId>
            <version>1.9.3</version>
        </dependency>
        <dependency>
            <groupId>commons-httpclient</groupId>
            <artifactId>commons-httpclient</artifactId>
            <version>3.1</version>
        </dependency>
        <!--将Java对象与json对象和xml互转-->
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-core-asl</artifactId>
            <version>1.9.13</version>
        </dependency>
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.9.13</version>
        </dependency>

 

1、通过原生生成json

package cn.demo;

import org.junit.*;
import java.util.*;
import com.alibaba.fastjson.*;

public class AloneTest {

    @Test
    public void alone(){
        // json串
        JSONObject data = new JSONObject();
        data.put("name", "zhansan");
        data.put("age", "18");
        data.put("address", "beijing xicheng");
        System.out.println(data);
        // 列表
        JSONArray content = new JSONArray();
        content.add("a");
        content.add("c");
        content.add("nice");
        System.out.println(content);

        return;
    }
}

执行结果：

 

2、通过hashMap数据结构生成

package cn.demo;

import org.junit.*;
import java.util.*;
import com.alibaba.fastjson.*;

public class AloneTest {

    @Test
    public void alone(){
        // ……
　　　　 //通过hashMap数据结构生成
        Map<String, Object> map = new HashMap<>();
        map.put("name", "wangwu");
        map.put("age", "20");
        map.put("address", "beijing shijingshan");
        System.out.println(new JSONObject(map).toJSONString());

        return;
    }
}

 

执行结果：

 

3、通过实体生成

package cn.demo;

import org.junit.*;
import java.util.*;
import com.alibaba.fastjson.*;

public class AloneTest {
    public class Student{
        private String name;
        private int age;
        private String address;

        public void setName(String name){
            this.name=name;
        }

        public String getName() {
            return name;
        }

        public void setAge(int age) {
            this.age = age;
        }

        public int getAge() {
            return age;
        }

        public void setAddress(String address) {
            this.address = address;
        }

        public String getAddress() {
            return address;
        }
    }

    @Test
    public void alone(){

        // 通过实体生成
        Student stu = new Student();
        stu.setName("wanwu");
        stu.setAge(22);
        stu.setAddress("shanghai");
        JSONObject stuJson = (JSONObject) JSON.toJSON(stu);
        System.out.println(stuJson);

        return;
    }
}

执行结果：

 

4、JSON字符串转换成JSON对象

package cn.demo;

import org.junit.*;
import java.util.*;
import com.alibaba.fastjson.*;

public class AloneTest {

    @Test
    public void alone(){

        // JSON字符串转换成JSON对象
        String strJson = "{\"address\":\"dishini\",\"name\":\"wanlu\",\"age\":33}";
        JSONObject jo = JSONObject.parseObject(strJson);
        System.out.println(jo);

        return;
    }
}

 

执行结果：

 

5、list对象与listJson的转换

package cn.demo;

import org.junit.*;
import java.util.*;
import com.alibaba.fastjson.*;

public class AloneTest {
    public class Student{
        private String name;
        private int age;
        private String address;

        public void setName(String name){
            this.name=name;
        }

        public String getName() {
            return name;
        }

        public void setAge(int age) {
            this.age = age;
        }

        public int getAge() {
            return age;
        }

        public void setAddress(String address) {
            this.address = address;
        }

        public String getAddress() {
            return address;
        }
    }

    @Test
    public void alone(){

        //list对象转listJson
        ArrayList<Student> studentList = new ArrayList();
        Student stu = new Student();
        stu.setName("chongwen");
        stu.setAge(32);
        stu.setAddress("acheng");
        studentList.add(stu);

        Student st = new Student();
        st.setName("anjing");
        st.setAge(18);
        st.setAddress("wuchang");
        studentList.add(st);

        //list转json字符串
        String str = JSON.toJSON(studentList).toString();
        System.out.println(str);

        //json字符串转listJson格式
        JSONArray ja = JSONObject.parseArray(str);
        System.out.println(ja);

        return;
    }
}

 

执行结果：