json-lib教程（一）

最新推荐文章于 2025-06-07 15:01:32 发布

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最新推荐文章于 2025-06-07 15:01:32 发布

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CC 4.0 BY-SA版权

文章标签： json java python

原文链接：https://my.oschina.net/u/3238650/blog/918632

本文提供了一系列使用Java进行JSON数据操作的实用示例，包括创建、修改JSON对象与数组，将集合与数组转换为JSON格式等。

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1.JSON Object

package com.bethecoder.tutorials.json_lib.tests;

import net.sf.json.JSONObject;

public class First {

  /**
   * @param args
   */
  public static void main(String[] args) {

    JSONObject obj = new JSONObject();
    obj.put("name", "Sriram");
    obj.put("age", 2);
    obj.put("hobby", "painting");
    
    System.out.println(obj.toString(2)); //pretty print with indent
  }

}

运行结果

{
  "name": "Sriram",
  "age": 2,
  "hobby": "painting"
}

2.Map to JSON

package com.bethecoder.tutorials.json_lib.tests;

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

import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;

public class Map2Json {

  /**
   * @param args
   */
  public static void main(String[] args) {

    Map<String, Object> map = new HashMap<String, Object>();
    map.put("name", "Sriram");
    map.put("age", 2);
    map.put("dob", new Date(110, 4, 6));
    map.put("hobby", "painting");
    
    JSONObject obj = (JSONObject) JSONSerializer.toJSON(map);
    System.out.println(obj.toString(2)); //pretty print with indent
  }

}

运行结果：

{
  "dob":   {
    "date": 6,
    "day": 4,
    "hours": 0,
    "minutes": 0,
    "month": 4,
    "seconds": 0,
    "time": 1273084200000,
    "timezoneOffset": -330,
    "year": 110
  },
  "age": 2,
  "name": "Sriram",
  "hobby": "painting"
}

3.JSON Add Element

package com.bethecoder.tutorials.json_lib.tests;

import java.util.Arrays;

import net.sf.json.JSONObject;

public class JsonAddElement {

  /**
   * @param args
   */
  public static void main(String[] args) {

    JSONObject obj = new JSONObject()
      .element("name", "Sriram")
      .element("age", 2)
      .element("hobby", "painting")
      .element("certificates", Arrays.asList("SCJA", "SCJP", "SCWCD"));
    
    System.out.println(obj.toString(2)); //pretty print with indent
  }

}

运行结果：

{
  "name": "Sriram",
  "age": 2,
  "hobby": "painting",
  "certificates":   [
    "SCJA",
    "SCJP",
    "SCWCD"
  ]
}

4.JSON Accumulate

package com.bethecoder.tutorials.json_lib.tests;

import net.sf.json.JSONObject;

public class JsonAccumulate {

  /**
   * @param args
   */
  public static void main(String[] args) {

    JSONObject jsonObj = new JSONObject();
    jsonObj.accumulate("certificates", "SCJA");
    System.out.println(jsonObj.toString(2));
    
    jsonObj.accumulate("certificates", "SCJP");
    jsonObj.accumulate("certificates", "SCWCD");
    System.out.println(jsonObj.toString(2)); //pretty print with indent
  }

}

运行结果：

{"certificates": "SCJA"}

{"certificates": [
  "SCJA",
  "SCJP",
  "SCWCD"
]}

5.JSON Accumulate All

package com.bethecoder.tutorials.json_lib.tests;

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

import net.sf.json.JSONObject;

public class JsonAccumulateAll {

  /**
   * @param args
   */
  public static void main(String[] args) {

    JSONObject jsonObj = new JSONObject();
    jsonObj.put("certificates", "SCJA");
    jsonObj.put("prev_ranks", "Rank#2");
    System.out.println(jsonObj.toString(2));
    
    Map<String, Object> map = new HashMap<String, Object>();
    map.put("certificates", "SCJP");
    map.put("prev_ranks", "Rank#1");
    jsonObj.accumulateAll(map);
    
    System.out.println(jsonObj.toString(2)); //pretty print with indent
  }

}

运行结果：

{
  "certificates": "SCJA",
  "prev_ranks": "Rank#2"
}


{
  "certificates":   [
    "SCJA",
    "SCJP"
  ],
  "prev_ranks":   [
    "Rank#2",
    "Rank#1"
  ]
}

6.JSON Array

package com.bethecoder.tutorials.json_lib.tests;

import net.sf.json.JSONArray;

public class JsonArrayCreation {

  /**
   * @param args
   */
  public static void main(String[] args) {

    JSONArray jsonArray = new JSONArray();
    jsonArray.add("one");
    jsonArray.add(new Integer(2));
    jsonArray.add(new Long(3));
    jsonArray.add(new Double(4.26));
    jsonArray.add(true);
    jsonArray.add(new char [] { 'A', 'B', 'C' });
    
    System.out.println(jsonArray.toString(2)); //pretty print with indent
  }

}

运行结果：

[
  "one",
  2,
  3,
  4.26,
  true,
    [
    "A",
    "B",
    "C"
  ]
]

7.JSON Array Add Element

package com.bethecoder.tutorials.json_lib.tests;

import net.sf.json.JSONArray;

public class JsonArrayAddElement {

  /**
   * @param args
   */
  public static void main(String[] args) {

    JSONArray jsonArray = new JSONArray()
            .element("one")
            .element(new Integer(2))
            .element(new Long(3))
            .element(new Double(4.00))
            .element(true)
            .element(new char [] { 'A', 'B', 'C' });
    
    System.out.println(jsonArray.toString(2)); //pretty print with indent
  }

}

运行结果：

[
  "one",
  2,
  3,
  4,
  true,
    [
    "A",
    "B",
    "C"
  ]
]

8.Array2JsonArray

package com.bethecoder.tutorials.json_lib.tests;

import net.sf.json.JSONArray;
import net.sf.json.JSONSerializer;

public class Array2JsonArray {

  /**
   * @param args
   */
  public static void main(String[] args) {
    
    Object [] genArray = new Object [] {
        "one",
        new Integer(2),
        new Long(3),
        new Double(4.26),
        true,
        new char [] { 'A', 'B', 'C' }
    };
    
    JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON(genArray);
    System.out.println(jsonArray.toString(2)); //pretty print with indent
  }

}

运行结果：

[
  "one",
  2,
  3,
  4.26,
  true,
    [
    "A",
    "B",
    "C"
  ]
]

9.Collection to JSON Array

package com.bethecoder.tutorials.json_lib.tests;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import net.sf.json.JSONArray;
import net.sf.json.JSONSerializer;

public class Collection2JsonArray {

  /**
   * @param args
   */
  public static void main(String[] args) {
    List<String> strs = Arrays.asList("one", "two", "three", "four");
    JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON(strs);
    System.out.println(jsonArray.toString(2)); //pretty print with indent
    
    List<Object> genList = new ArrayList<Object>();
    genList.add("one");
    genList.add(new Integer(2));
    genList.add(new Long(3));
    genList.add(new Double(4.26));
    genList.add(true);
    genList.add(new char [] { 'A', 'B', 'C' });
    
    jsonArray = (JSONArray) JSONSerializer.toJSON(genList);
    System.out.println(jsonArray.toString(2)); //pretty print with indent
  }

}

运行结果：

[
  "one",
  "two",
  "three",
  "four"
]


[
  "one",
  2,
  3,
  4.26,
  true,
    [
    "A",
    "B",
    "C"
  ]
]

转载于:https://my.oschina.net/u/3238650/blog/918632