JSON数据转换之net.sf.json包的使用
转载： https://blog.csdn.net/itlwc/article/details/38442667
一、介绍
使用之前需要导入的jar包：
json-lib-2.4-jdk15.jar commons-lang.jar commons-beanutils.jar commons-collections.jar commons-logging.jar ezmorph.jar <!--这个包我没导入，也可以使用-->
二、使用
1.JSONObject的使用
public class JSONObjectUse { public static void main(String[] args) { //创建JSONObject对象 JSONObject jsonObject = new JSONObject(); jsonObject.put("username","wln"); jsonObject.put("password","123"); System.out.println("1：" + jsonObject); //增加属性 jsonObject.element("sex","男"); System.out.println("2：" + jsonObject); //判断输出对象的类型 boolean isArray = jsonObject.isArray(); boolean isEmpty = jsonObject.isEmpty(); boolean isNullObject = jsonObject.isNullObject(); System.out.println("3：" + "是否是数组：" + isArray +" 是否是空：" + isEmpty + " 是否是空对象：" + isNullObject); //创建JSONArray JSONArray jsonArray = new JSONArray(); jsonArray.add(0,"aa"); jsonArray.add("BB"); jsonArray.add(1,"AB"); jsonArray.add("cc"); //将JSONArray 添加到JSONObject jsonObject.element("student",jsonArray); System.out.println("4：" + jsonObject); } } 结果： 1：{"username":"wln","password":"123"} 2：{"username":"wln","password":"123","sex":"男"} 3：是否是数组：false 是否是空：false 是否是空对象：false 4：{"username":"wln","password":"123","sex":"男","student":["aa","AB","BB","cc"]}
2.JSONArray的使用
public class JSONArrayUse {
public static void main(String[] args) {
//创建JSONArray对象
JSONArray jsonArray = new JSONArray();
jsonArray.add(0,"aa");
jsonArray.add(1,"BB");
jsonArray.element("cc");
jsonArray.add("DD");
System.out.println("1：" + jsonArray);
//根据下标获取数据
System.out.println("2：" + jsonArray.get(0));
//根据下标设置数据
jsonArray.set(0,"AAA");
System.out.println("3：" + jsonArray);
//创建JSONObject
JSONObject jsonObject = new JSONObject();
jsonObject.put("username", "lwc");
jsonObject.put("password", "123");
//把JSONObject放入到JSONArray中
jsonArray.add(jsonObject);
System.out.println("4：" + jsonArray);
//遍历
System.out.println("5：");
for(int i=0;i<jsonArray.size();i++){
System.out.print(jsonArray.get(i)+"\t");
}
}
}
结果：
1：["aa","BB","cc","DD"]
2：aa
3：["AAA","BB","cc","DD"]
4：["AAA","BB","cc","DD",{"username":"lwc","password":"123"}]
5：
AAA BB cc DD {"username":"lwc","password":"123"}
3.JavaBean与JSON字符串之间的转换
public class JavaBeanUse {
public static void main(String[] args) {
//将JavaBean转换为JSONObject
Student student = new Student("wln", "22");
JSONObject jsonObject = JSONObject.fromObject(student);
System.out.println("1：" + jsonObject);
//将JSONString转换为JSONObject
String jsonStr = "{\"name\":\"nana\",\"age\":\"33\"}";
JSONObject jsonObject1 = JSONObject.fromObject(jsonStr);
Student stu = (Student) JSONObject.toBean(jsonObject1,Student.class);
System.out.println("2：" + stu);
System.out.println("3：" + stu.getName() +" "+ stu.getAge());
}
}
结果：
1：{"age":"22","name":"wln"}
2：com.springboot.devtools.jsonUse.entity.Student@61a485d2
3：nana 33
public class Student {
private String name;
private String age;
public Student() {
}
public Student(String name, String age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
}
4.List与JSON字符串之间的转换
public class ListUse {
public static void main(String[] args) {
//将List转成JSONArray
List list = new ArrayList();
list.add(new Student("wln","22"));
list.add(new Student("nana","33"));
JSONArray jsonArray = JSONArray.fromObject(list);
System.out.println("1：" + jsonArray);
//将JSONString转成List
List list1 = new ArrayList();
String strJSON = "[{\"name\":\"dada\",\"age\":\"44\"},{\"name\":\"xiaoxiao\",\"age\":\"55\"}]";
JSONArray jsonArray1 = JSONArray.fromObject(strJSON);
for(int i = 0;i < jsonArray1.size(); i++) {
JSONObject jsonObject = jsonArray1.getJSONObject(i);
Student stu = (Student) JSONObject.toBean(jsonObject,Student.class);
list1.add(stu);
}
System.out.println("2：" + list1);
}
}
结果：
1：[{"age":"22","name":"wln"},{"age":"33","name":"nana"}]
2：[com.springboot.devtools.jsonUse.entity.Student@7946e1f4, com.springboot.devtools.jsonUse.entity.Student@3c09711b]
5.Map与JSON字符串之间的转换
public class MapUse {
public static void main(String[] args) {
//Map转JSONString
Map map = new HashMap();
map.put("1", new Student("wln","22"));
map.put("2", new Student("nana","33"));
JSONObject jsonMap = JSONObject.fromObject(map);
System.out.println("1：" + map);
//JSONString转Map
String jsonStr = "{\"1\":{\"name\":\"dada\",\"age\":\"44\"},\"2\":{\"name\":\"xiaoxiao\",\"age\":\"55\"}}";
Map map1 = (Map) JSONObject.fromObject(jsonStr);
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("2：" + key + " " + stu);
}
}
}
结果：
1：{1=com.springboot.devtools.jsonUse.entity.Student@1b40d5f0, 2=com.springboot.devtools.jsonUse.entity.Student@ea4a92b}
2：1 com.springboot.devtools.jsonUse.entity.Student@3c09711b
2：2 com.springboot.devtools.jsonUse.entity.Student@5cc7c2a6
6.JSONArray与List之间的转换
public class JSONArrayToList {
public static void main(String[] args) {
//List转换为JSONArray
List<Student> list = new ArrayList<Student>();
list.add(new Student("wln","22"));
list.add(new Student("nana","33"));
JSONArray jsonArray = JSONArray.fromObject(list);
System.out.println("1：" + jsonArray);
//JSONArray转换为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("2：" + stu);
}
}
}
结果：
1：[{"age":"22","name":"wln"},{"age":"33","name":"nana"}]
2：com.springboot.devtools.jsonUse.entity.Student@69d9c55
2：com.springboot.devtools.jsonUse.entity.Student@13a57a3b
7.JSONArray与数组之间的转换
public class JSONArrayToArray {
public static void main(String[] args) {
//Java数组转换JSONArray
boolean[] boolArray = new boolean[] {true, false, true};
JSONArray jsonArray = JSONArray.fromObject(boolArray);
System.out.println("1："+ jsonArray.toString());
//JSONArray转换Java数组
Object obj[] = jsonArray.toArray();
for (Object o : obj) {
System.out.print("2：" + o + " ");
}
}
}
结果：
1：[true,false,true]
2：true 2：false 2：true
8.XML与JSON之间的转换
需要导入xom-1.1.jar
public class XMLToJSON {
public static void main(String[] args) throws Exception {
//XML转换JSON
String xml = "<root>" + "<name type='type'>wln</name>"
+ "<gender>woman</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("1：" + json.toString(2));
//JSON转换XML
String jsonStr = "{\"root\":{" + "\"name\":\"wln\","
+ "\"gender\":\"woman\"," + "\"birthday\":{"
+ "\"year\":\"1970\"," + "\"month\":\"12\"," + "\"day\":\"17\""
+ "}" + "}" + "}";
JSONObject jsonObject = JSONObject.fromObject(jsonStr);
String xmlStr = new XMLSerializer().write(jsonObject);
System.out.println("2：" + xmlStr);
}
}
结果：
1：{
"name": "wln",
"gender": "woman",
"birthday": {
"year": "1970",
"month": "12",
"day": "17"
}
}
2：<?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">woman</gender><name type="string">wln</name></root></o>
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