The various conversion methods in java for handling json are recommended by of
- 2020-12-05 17:11:23
- OfStack
JSON, or JavaScript Object Natation, is a lightweight data exchange format that is well suited for server interactions with JavaScript. This article takes a quick look at the JSON format and shows you how to process JSON data on the client side and the server side, respectively, with code examples.
Json required packages:
commons-httpclient-3.1.jar
commons-lang-2.4.jar
commons-logging-1.1.1.jar
json-lib-2.2.3-jdk13.jar
ezmorph-1.0.6.jar
commons-collections-3.2.1.jar
Appear java. lang. NoClassDefFoundError: net/sf/ezmorph/Morpher error because no import ezmorph jar file or the wrong version.
Appear java. lang. NoClassDefFoundError: org/apache/commons/collections/map/ListOrderedMap error because no import commons - collections. jar file or the wrong version.
1. Conversion between java sets and json sets
1. Java set converted to Json set
Key class: JSONArray jsonArray = ES61en. fromObject(Object obj);
Instruction: the Java collection object is directly passed into JSONArray.fromObject (), and one JSONArray collection is obtained. Then, the toString() method of JSONArray is directly used to obtain the json collection
Sample code:
@Test
public void testCreateJsonArray() {
//Java A collection of
List<Employee> list = new ArrayList<Employee>();
list.add(new Employee("zhangSan","13"));
list.add(new Employee("liSi","14"));
// create json A collection of
JSONArray jsonArray = JSONArray.fromObject(list);
System.out.println(jsonArray.toString());
}
Output results:
[{"age":"13","name":"zhangSan"},{"age":"14","name":"liSi"}]
2. Json set converted to Java set
Key class: JSONArray jsonArray = ES88en. fromObject(Object obj);
Instruction: Pass in json string object, you can get 1 JSONArray object, and then call toCollection(JSONArray jsonArray, Class clss) method of JSONArray object, you can get 1 Java object collection.
Sample code:
@Test
public void testParseJsonArray() {
//json A collection of
String jsonString = "[{\"age\":\"13\",\"name\":\"zhangSan\"},{\"age\":\"14\",\"name\":\"liSi\"}]";
JSONArray jsonArray = JSONArray.fromObject(jsonString);
//Java A collection of
List<Employee> list = (List<Employee>) jsonArray.toCollection(jsonArray, Employee.class);
for(Employee employee : list){
System.out.println(employee);
}
}
Output results:
[name=zhangSan,age=13]
[name=liSi,age=14]
2.JAVA realizes the mutual conversion method between XML and JSON
1.XML converted to Json
public static String xmlToJson(String xml) {
XMLSerializer serializer = new XMLSerializer();
return serializer.read(xml).toString();
}
2.JSON converted to XML
public static String jsonToXML(String json) {
XMLSerializer xmlSerializer = new XMLSerializer();
// Root node name
xmlSerializer.setRootName("xml");
// Do not set the type
xmlSerializer.setTypeHintsEnabled(false);
String xmlStr = "";
if (json.contains("[") && json.contains("]")) {
// jsonArray
JSONArray jobj = JSONArray.fromObject(json);
xmlStr = xmlSerializer.write(jobj);
} else {
// jsonObject
JSONObject jobj = JSONObject.fromObject(json);
xmlStr = xmlSerializer.write(jobj);
}
System.out.println(" Converted parameters: " + xmlStr);
return xmlStr;
}