JSON ,map,list.xml相互转换

下载地址

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本次使用版本:http://sourceforge.net/projects/json-lib/files/json-lib/json-lib-1.1/

最新版本:http://sourceforge.net/projects/json-lib/files/json-lib/

使用net.sf.json需要导入的包

JSONObject

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package com.itlwc.test;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

public class Test {

public static void main(String[] args) {

// 创建JSONObject

JSONObject jsonObject = new JSONObject();

jsonObject.put("username", "lwc");

jsonObject.put("password", "123");

// 打印:1

System.out.println(jsonObject);

// 增加属性,打印:2

jsonObject.element("sex", "男");

System.out.println(jsonObject);

// 根据key返回,打印:3

System.out.println(jsonObject.get("sex"));

// 判读输出对象的类型

boolean isArray = jsonObject.isArray();

boolean isEmpty = jsonObject.isEmpty();

boolean isNullObject = jsonObject.isNullObject();

// 打印:4

System.out.println("是否数组:" + isArray + " 是否空:" + isEmpty + " 是否空对象:"

+ isNullObject);

// 把JSONArray增加到JSONObject中

JSONArray jsonArray = new JSONArray();

jsonArray.add(0, "lwc");

jsonArray.add(1, "nxj");

// 开始增加

jsonObject.element("student", jsonArray);

// 打印:5

System.out.println(jsonObject);

}

}

/*

打印结果

{"username":"lwc","password":"123"}

{"username":"lwc","password":"123","sex":"男"}

男

是否为数组:false 是否为空:false 是否为空对象:false

{"username":"lwc","password":"123","sex":"男","student":["lwc","nxj"]}

*/

JSONArray

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package com.itlwc.test;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

public class Test {

public static void main(String[] args) {

//创建JSONArray

JSONArray jsonArray = new JSONArray();

jsonArray.add(0, "lwc");

jsonArray.add(1, "nxj");

jsonArray.element("mxj");

//打印:1

System.out.println(jsonArray);

//根据下标返回,打印:2

System.out.println(jsonArray.get(0));

//根据下标设置新值,打印:3

jsonArray.set(0, "itlwc");

System.out.println(jsonArray);

//把JSONObject放入到JSONArray中

JSONObject jsonObject = new JSONObject();

jsonObject.put("username", "lwc");

jsonObject.put("password", "123");

//开始增加,打印:4

jsonArray.add(jsonObject);

System.out.println(jsonArray);

//遍历,打印:5

for(int i=0;i<jsonArray.size();i++){

System.out.print(jsonArray.get(i)+"\t");

}

}

}

/*

打印结果

["lwc","nxj","mxj"]

lwc

["itlwc","nxj","mxj"]

["itlwc","nxj","mxj",{"username":"lwc","password":"123"}]

itlwc nxj mxj {"username":"lwc","password":"123"}

*/

JavaBean与json字符串互转

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package com.itlwc.test;

import net.sf.json.JSONObject;

import com.itlwc.entity.Student;

public class Test {

public static void main(String[] args) {

// JavaBean对象转json字符串

Student stu1 = new Student("lwc", "111111");

JSONObject jsonObject = JSONObject.fromObject(stu1);

System.out.println(jsonObject);

// json字符串转JavaBean

String jsondata = "{\"password\":\"111111\",\"username\":\"lwc\"}";

JSONObject jsonObject1 = JSONObject.fromObject(jsondata);

Student stu2 = (Student) JSONObject.toBean(jsonObject1, Student.class);

System.out.println(stu2);

}

}

/*

打印结果:

{"password":"111111","username":"lwc"}

用户: lwc 密码:111111

*/

List与json字符串互转

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package com.itlwc.test;

import java.util.ArrayList;

import java.util.List;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

import com.itlwc.entity.Student;

public class Test {

public static void main(String[] args) {

// List转json字符串

List list = new ArrayList();

list.add(new Student("lwc", "111111"));

list.add(new Student("nxj", "222222"));

JSONArray jsonArray = JSONArray.fromObject(list);

System.out.println(jsonArray);

// json字符串转List

List list1 = new ArrayList();

String jsondata = "[{\"password\":\"111111\",\"username\":\"lwc\"},{\"password\":\"222222\",\"username\":\"nxj\"}]";

JSONArray jsonArray1 = JSONArray.fromObject(jsondata);

for (int i = 0; i < jsonArray1.size(); i++) {

JSONObject jsonObject2 = jsonArray1.getJSONObject(i);

Student stu2 = (Student) JSONObject.toBean(jsonObject2,

Student.class);

list1.add(stu2);

}

System.out.println(list1);

}

}

/*

打印结果:

[{"password":"111111","username":"lwc"},{"password":"222222","username":"nxj"}]

[用户: lwc 密码:111111, 用户: nxj 密码:222222]

*/

Map与json字符串互转

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package com.itlwc.test;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

import net.sf.json.JSONObject;

import com.itlwc.entity.Student;

public class Test {

public static void main(String[] args) {

// Map转json字符串

Map map = new HashMap();

map.put("1", new Student("lwc", "111111"));

map.put("2", new Student("nxj", "222222"));

JSONObject jsonMap = JSONObject.fromObject(map);

System.out.println(jsonMap);

// json字符串转Map

String jsondata = "{\"2\":{\"password\":\"222222\",\"username\":\"nxj\"},\"1\":{\"password\":\"111111\",\"username\":\"lwc\"}}";

Map map1 = (Map) JSONObject.fromObject(jsondata);

Set set = map1.keySet();

Iterator ite = set.iterator();

while (ite.hasNext()) {

String key = (String) ite.next();

JSONObject jsonObject = JSONObject.fromObject(map1.get(key));

Student stu = (Student) JSONObject

.toBean(jsonObject, Student.class);

System.out.println(key + " " + stu);

}

}

}

/*

打印结果:

{"2":{"password":"222222","username":"nxj"},"1":{"password":"111111","username":"lwc"}}

2 用户: nxj 密码:222222

1 用户: lwc 密码:111111

*/

JSONArray与List互转

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package com.itlwc.test;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import net.sf.json.JSONArray;

import net.sf.json.JsonConfig;

import com.itlwc.entity.Student;

public class Test {

public static void main(String[] args) {

//List转型JSONArray

List<Student> list = new ArrayList<Student>();

list.add(new Student("lwc", "111111"));

list.add(new Student("nxj", "222222"));

JSONArray jsonArray = JSONArray.fromObject(list);

System.out.println(jsonArray.toString());

//JSONArray转型List

List<Student> list2 = JSONArray.toList(jsonArray, new Student(), new JsonConfig());

Iterator<Student> ite = list2.iterator();

while(ite.hasNext()){

Student stu =ite.next();

System.out.println(stu);

}

}

}

/*

打印结果

[{"password":"111111","username":"lwc"},{"password":"222222","username":"nxj"}]

用户: lwc 密码:111111

用户: nxj 密码:222222

*/

JSONArray与数组互转

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package com.itlwc.test;

import net.sf.json.JSONArray;

public class Test {

public static void main(String[] args) {

// Java数组转JSONArray

boolean[] boolArray = new boolean[] { true, false, true };

JSONArray jsonArray = JSONArray.fromObject(boolArray);

System.out.println(jsonArray.toString());

// JSONArray转Java数组

Object obj[] = jsonArray.toArray();

for (Object o : obj) {

System.out.print(o + " ");

}

}

}

/*

打印结果 :

[true,false,true]

true false true

*/

XML与JSON互转

需要导入xom-1.1.jar

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package com.itlwc.test;

import net.sf.json.JSON;

import net.sf.json.JSONObject;

import net.sf.json.xml.XMLSerializer;

public class Test {

public static void main(String[] args) throws Exception {

// XML转JSON

String xml = "<root>" + "<name type='type'>zhaipuhong</name>"

+ "<gender>male</gender>" + "<birthday>" + "<year>1970</year>"

+ "<month>12</month>" + "<day>17</day>" + "</birthday>"

+ "</root>";

XMLSerializer xmlSerializer = new XMLSerializer();

JSON json = xmlSerializer.read(xml);

System.out.println(json.toString(2));

// JSON转XML

String jsondata = "{\"root\":{" + "\"name\":\"zhaipuhong\","

+ "\"gender\":\"male\"," + "\"birthday\":{"

+ "\"year\":\"1970\"," + "\"month\":\"12\"," + "\"day\":\"17\""

+ "}" + "}" + "}";

JSONObject jsonObject = JSONObject.fromObject(jsondata);

String xmlstr = new XMLSerializer().write(jsonObject);

System.out.println(xmlstr);

}

}

/*

打印结果:

{

"name": "zhaipuhong",

"gender": "male",

"birthday": {

"year": "1970",

"month": "12",

"day": "17"

}

}

<?xml version="1.0" encoding="UTF-8"?>

<o>

<root class="object">

<birthday class="object">

<day type="string">17</day>

<month type="string">12</month>

<year type="string">1970</year>

</birthday>

<gender type="string">male</gender>

<name type="string">zhaipuhong</name>

</root>

</o>