--------------------------------------------------java中--------------------------------------------------------------
1.String转JSONObject
(1)json-lib(即net.sf.json.JSONObject)
String jsonMessage = "{\"语文\":\"88\",\"数学\":\"78\",\"计算机\":\"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)json-lib(即net.sf.json.JSONObject)
String jsonMessage = "{\"语文\":\"88\",\"数学\":\"78\",\"计算机\":\"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三个jar包 )
String json = "{\"PayPal key2\":\"PayPal value2\",\"PayPal key1\":\"PayPal value1\",\"PayPal key3\":\"PayPalvalue3\"}";
ObjectMapper mapper = new ObjectMapper();
Map
(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(), "=");
}
(5)Gson
Map map = new Gson().fromJson(jsonStr,Map.class);
4.JSONObject、JSONArray,Map转String
JSONObject——String:
System.out.println(myJsonObject);//可直接输出JSONObject的内容
myJsonObject.toString();
阿里巴巴fastjson:
String str = JSON.toJSONString(obj,SerializerFeature.BrowserCompatible);
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
先jsonArray先循环取出jsonObject,在转成Map
9.Map转JSONObject
(1)json-lib(即net.sf.json.JSONObject)
JSONObject json = JSONObject.fromObject( map );
或
String jsonString = JSON.toJSONString(map,SerializerFeature.WriteMapNullValue,SerializerFeature.WriteNullStringAsEmpty);
(2)alibaba的fastjson
JSONObject json = JSON.parseObject(str);
Map转json格式的String
JSON.toJSONString(map, SerializerFeature.BrowserCompatible).replace("\\\\u", "\\u");
//需要引入alibaba的fastjson包
10.Map转JSONArray
JSONArray.fromObject(map);
11.List转JSONArray
JSONArray jsonArray2 = JSONArray.fromObject( list );
fastjson:List转JSONArray
(1)List
(2)JSONArray jsonArray = new JSONArray(list1) ;
12.JSONArray转List
List
或
public static List
jsonArray转实体类list:
Student[] ss =(Student[])net.sf.json.JSONArray.toArray(jsonArray,Student.class);
fastjson:JSONArray转List
JSONArray arr = new JSONArray();
arr.add(0,"13");
arr.add(1,"jo");
arr.add(2,"kpo");
List
JSONArray array = new JSONArray();
List
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();
String转List
String str = "";
List
或net.sf.json
String arrayStr="[{\"name\":\"JSON\",\"age\":\"24\",\"address\":\"北京市西城区\"},{\"name\":\"JSON2\",\"age\":\"24\",\"address\":\"北京市西城区\"}]";
//转化为list
List
数组转String
char[] data={a,b,c};
String s=new String(data);
14.java实体类的List转String
JSON与String关系比较近,而JSON的子类JSONArray又和List关系比较近,故把JSONArray做中介过渡:
import com.alibaba.fastjson.JSONArray;
public String list2str(List list){
JSONArray jsonArray = (JSONArray) JSONArray.toJSON(list); //List转JSONArray
System.out.println(jsonArray.toString());
return jsonArray.toJSONString(); //JSONArray比较容易转String
}
15.Array、List、Set之间转换:
String[] arr = new String[]{"Tom", "Bob", "Jane"};
//Array转List
List
//Array转Set
Set
//List转Array
Object[] list2arr = arr2list.toArray();
//List转Set
Set
//Set转Array
Object[] set2arr = list2set.toArray();
//Set转List
List
List
16.java对象转JsonObject
Student stu=new Student();
stu.setName("JSON");
stu.setAge("23");
stu.setAddress("北京市西城区");
net.sf.json.JSONObject json = net.sf.json.JSONObject.fromObject(stu);
或alibaba的fastjson:
JSONObject json = (JSONObject) JSONObject.toJSON(stu);
17.java对象转jsonArray
Student stu=new Student();
stu.setName("JSON");
stu.setAge("23");
stu.setAddress("北京市西城区");
net.sf.json.JSONArray array = net.sf.json.JSONArray.fromObject(stu);
但alibaba的fastjson报错:
//JSONArray array = (JSONArray) JSONArray.toJSON(stu);//报错
18.JsonObject转java对象
Student stu=(Student)JSONObject.toBean(jsonObject, Student.class);
19.jsonArray转java对象
jsonArray先循环取出jsonObject,再转成java对象
参考:https://www.cnblogs.com/hoobey/p/8213670.html
https://www.cnblogs.com/ya-qiang/p/9009506.html
--------------------------------------------js中---------------------------------------
js中自定义的map请参考:http://blog.csdn.net/superit401/article/details/72842469
1.json转Map(并获取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+")");
//以下为获取Map的key-value:
for (var key in map) {
var a = map[key];
for (var k in a) {
alert(k+'---'+a[k]);
}
}
参考:http://www.bkjia.com/webzh/899371.html
2.Map转json:
不能直接map转json:var mjson = JSON.parse(map);
也不能var mjson = $.parseJSON(map);//结果为null
只能分两步走:
var mstr = JSON.stringify(map);
var jsonstr = JSON.parse(mstr);
(注:有的浏览器不支持JSON.parse()方法,使用jQuery.parseJSON()方法时,在浏览器支持时会返回执行JSON.parse()方法的结果,否则会返回类似执行eval()方法的结果)
参考:http://www.jb51.net/article/87642.htm
3.json转String:
JSON.stringify(json);
4.String转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转String:
var mstr = JSON.stringify(map);
6.String转Map:
var str = '{ "10.10.11.1": { "target_1": "34.2","target_3": "70.83","target_2": "50.51"}}';
var map = eval("("+str+")");