java和js中JSONObject,JSONArray,Map,String之間轉換——持續更新中
--------------------------------------------------java中--------------------------------------------------------------
1.String轉JSONObject
(1).
String jsonMessage = "{\"語文\":\"88\",\"數學\":\"78\",\"計算機\":\"99\"}";
JSONObject myJson = JSONObject.fromObject(jsonMessage);
(2).用阿里巴巴的fastjson的jar包
String str = "{\"baid\":null,\"32d3:\":\"null\",433:\"0x32\",032:\"ju9fw\"}";
com.alibaba.fastjson.JSONObject jm = com.alibaba.fastjson.JSON.parseObject(str);
2.String轉JSONArray
String jsonMessage = "[{'num':'成績', '外語':88, '歷史':65, '地理':99, 'object':{'aaa':'1111','bbb':'2222','cccc':'3333'}}," +
"{'num':'興趣', '外語':28, '歷史':45, '地理':19, 'object':{'aaa':'11a11','bbb':'2222','cccc':'3333'}}," +
"{'num':'愛好', '外語':48, '歷史':62, '地理':39, 'object':{'aaa':'11c11','bbb':'2222','cccc':'3333'}}]";
JSONArray myJsonArray = JSONArray.fromObject(jsonMessage);
System.out.println(myJsonArray);
3.String轉Map
(1)
String jsonMessage = "{\"語文\":\"88\",\"數學\":\"78\",\"計算機\":\"99\"}";
JSONObject myJson = JSONObject.fromObject(jsonMessage);
Map m = myJson;
(2)用阿里巴巴的fastjson的jar包
String str = "{\"baid\":null,\"32d3:\":\"null\",433:\"0x32\",032:\"ju9fw\"}";
Map mapTypes = com.alibaba.fastjson.JSON.parseObject(str);
(3) (需要引入jackjson的core、databind、annotations三個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);
(4)(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轉String
JSONObject——String:
System.out.println(myJsonObject);//可直接輸出JSONObject的內容
myJsonObject.toString();
阿里巴巴fastjson:
String str = JSON.toJSONString(obj,SerializerFeature.BrowserCompatible);
JSONArray——String:
System.out.println(myJsonArray);//可直接輸出myJsonArray的內容
myJsonArray.toString();
Map——String:
System.out.println(map);//可直接輸出map的內容
map.toString();
5.JSONObject轉JSONArray
6.JSONObject轉Map
JSONObject myJson = JSONObject.fromObject(jsonString);
Map m = myJson;
7.JSONArray轉JSONObject
for(int i=0 ; i < myJsonArray.length() ;i++)
{
//獲取每一個JsonObject物件
JSONObject myjObject = myJsonArray.getJSONObject(i);
}
8.JSONArray轉Map
9.Map轉JSONObject
JSONObject json = JSONObject.fromObject( map );
或
String jsonString = JSON.toJSONString(map,SerializerFeature.WriteMapNullValue,SerializerFeature.WriteNullStringAsEmpty);
JSONObject jm = JSON.parseObject(str);
(此為alibaba的fastjson)
Map轉json格式的String
JSON.toJSONString(map, SerializerFeature.BrowserCompatible).replace("\\\\u", "\\u");
//需要引入alibaba的fastjson包
10.Map轉JSONArray
JSONArray.fromObject(map);
11.List轉JSONArray
JSONArray jsonArray2 = JSONArray.fromObject( list );
fastjson:List轉JSONArray
(1)List<Object> list1 = new ArrayList<Object>();
list1.add("false");
list1.add(true);
list1.add(null);
list1.add(0x13e);
list1.add(0123);
JSONArray array1 = JSONArray.parseArray(JSON.toJSONString(list1));
(2)JSONArray jsonArray = new JSONArray(list1) ;
12.JSONArray轉List
List<Map<String,Object>> mapListJson = (List)jsonArray;
或
public static List<Map<String, Object>> jsonArrayToList(JSONArray ja){
return JSONArray.toJavaObject(ja, List.class);
}
fastjson:JSONArray轉List
JSONArray arr = new JSONArray();
arr.add(0,"13");
arr.add(1,"jo");
arr.add(2,"kpo");
List<String> list = JSONObject.parseArray(array.toJSONString(), String.class);
JSONArray array = new JSONArray();
List<T> list = JSONObject.parseArray(array.toJSONString(), T.class);
13.String轉陣列
String string = "a,b,c";
String [] stringArr= string.split(","); //注意分隔符是需要轉譯滴...
如果是"abc"這種字串,就直接
String string = "abc" ;
char [] stringArr = string.toCharArray(); //注意返回值是char陣列
如果要返回byte陣列就直接使用getBytes方法就ok了~~
String string = "abc" ;
byte [] stringArr = string.getBytes();
String轉List
String str = "";
List<T> list = JSONObject.parseArray(str, T.class);
陣列轉String
char[] data={a,b,c};
String s=new String(data);
14.java實體類的List轉String
JSON與String關係比較近,而JSON的子類JSONArray又和List關係比較近,故把JSONArray做中介過渡:
import com.alibaba.fastjson.JSONArray;
public String list2str(List<?> list){
JSONArray jsonArray = (JSONArray) JSONArray.toJSON(list); //List轉JSONArray
System.out.println(jsonArray.toString());
return jsonArray.toJSONString(); //JSONArray比較容易轉String
}
15.Array、List、Set之間轉換:
String[] arr = new String[]{"Tom", "Bob", "Jane"};
//Array轉List
List<String> arr2list = Arrays.asList(arr);
//Array轉Set
Set<String> arr2set = new HashSet<String>(Arrays.asList(arr));
//List轉Array
Object[] list2arr = arr2list.toArray();
//List轉Set
Set<String> list2set = new HashSet<>(arr2list);
//Set轉Array
Object[] set2arr = list2set.toArray();
//Set轉List
List<String> set2list = new ArrayList<>(arr2set);
List<String> list = new ArrayList<String>(new HashSet<String>());//
--------------------------------------------js中---------------------------------------
js中自定義的map請參考:http://blog.csdn.net/superit401/article/details/72842469
1.json轉Map(並獲取key和value)
var str = JSON.stringify(json);
str = '{ "10.10.11.1": { "target_1": "34.2","target_3": "70.83","target_2": "50.51"}}';
var map = eval("("+str+")");
//以下為獲取Map的key-value:
for (var key in map) {
var a = map[key];
for (var k in a) {
alert(k+'---'+a[k]);
}
}
參考:http://www.bkjia.com/webzh/899371.html
2.Map轉json:
不能直接map轉json:var mjson = JSON.parse(map);
也不能var mjson = $.parseJSON(map);//結果為null
只能分兩步走:
var mstr = JSON.stringify(map);
var jsonstr = JSON.parse(mstr);
(注:有的瀏覽器不支援JSON.parse()方法,使用jQuery.parseJSON()方法時,在瀏覽器支援時會返回執行JSON.parse()方法的結果,否則會返回類似執行eval()方法的結果)
參考:http://www.jb51.net/article/87642.htm
3.json轉String:
JSON.stringify(json);
4.String轉json:
var str = '{ "10.10.11.1": { "target_1": "34.2","target_3": "70.83","target_2": "50.51"}}';
var jsonstr = JSON.parse(str);
5.Map轉String:
var mstr = JSON.stringify(map);
6.String轉Map:
var str = '{ "10.10.11.1": { "target_1": "34.2","target_3": "70.83","target_2": "50.51"}}';
var map = eval("("+str+")");