转自:https://www.cnblogs.com/robbinluobo/p/6142720.html
1.String转JSONObject
String jsonMessage = "{\"语文\":\"88\",\"数学\":\"78\",\"计算机\":\"99\"}";
JSONObject myJson = JSONObject.fromObject(jsonMessage);
2.String转JSONArray
String jsonMessage = "[{'num':'成绩', '外语':88, '历史':65, '地理':99, 'object':{'aaa':'1111','bbb':'2222','cccc':'3333'}}," +
"{'num':'兴趣', '外语':28, '历史':45, '地理':19, 'object':{'aaa':'11a11','bbb':'2222','cccc':'3333'}}," +
"{'num':'爱好', '外语':48, '历史':62, '地理':39, 'object':{'aaa':'11c11','bbb':'2222','cccc':'3333'}}]";
JSONArray myJsonArray = JSONArray.fromObject(jsonMessage);
System.out.println(myJsonArray);
3.String转Map
(1)
String jsonMessage = "{\"语文\":\"88\",\"数学\":\"78\",\"计算机\":\"99\"}";
JSONObject myJson = JSONObject.fromObject(jsonMessage);
Map m = myJson;
(2) (需要引入jackjson的core、databind、annotations三个jar包 )
String json = "{\"PayPal key2\":\"PayPal value2\",\"PayPal key1\":\"PayPal value1\",\"PayPal key3\":\"PayPalvalue3\"}";
ObjectMapper mapper = new ObjectMapper();
Map<String,Object> m = mapper.readValue(json, Map.class);
(3)(特殊格式的String)
String a ="{se=2016, format=xml, at=en co=3}";
a = a.substring(1, a.length()-1);
Map docType = new HashMap();
Java.util.StringTokenizer items;
for(StringTokenizer entrys = new StringTokenizer(a, ", ");entrys.hasMoreTokens();
docType.put(items.nextToken(), items.hasMoreTokens() ? ((Object) (items.nextToken())) : null)){
items = new StringTokenizer(entrys.nextToken(), "=");
}
4.JSONObject、JSONArray,Map转String
JSONObject——String:
System.out.println(myJsonObject);//可直接输出JSONObject的内容
myJsonObject.toString();
JSONArray——String:
System.out.println(myJsonArray);//可直接输出myJsonArray的内容
myJsonArray.toString();
Map——String:
System.out.println(map);//可直接输出map的内容
map.toString();
5.JSONObject转JSONArray
6.JSONObject转Map
JSONObject myJson = JSONObject.fromObject(jsonString);
Map m = myJson;
7.JSONArray转JSONObject
for(int i=0 ; i < myJsonArray.length() ;i++)
{
//获取每一个JsonObject对象
JSONObject myjObject = myJsonArray.getJSONObject(i);
}
8.JSONArray转Map
9.Map转JSONObject
JSONObject json = JSONObject.fromObject( map );
10.Map转JSONArray
JSONArray.fromObject(map);
11.List转JSONArray
JSONArray jsonArray2 = JSONArray.fromObject( list );
12.JSONArray转List
List<Map<String,Object>> mapListJson = (List)jsonArray;
13.String转数组
String string = "a,b,c";
String [] stringArr= string.split(","); //注意分隔符是需要转译滴...
如果是"abc"这种字符串,就直接
String string = "abc" ;
char [] stringArr = string.toCharArray(); //注意返回值是char数组
如果要返回byte数组就直接使用getBytes方法就ok了~~
String string = "abc" ;
byte [] stringArr = string.getBytes();
数组转String
char[] data={a,b,c};
String s=new String(data);
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