androidmap转json

㈠ 安卓Json --JSONArray --Map 类型转换

1.JSONArray 转 Map。先将JSAONArray 转为 string类型的Json字符串，然后利用Gson将String类型的JSON字符串转为对应的输出类型。

2.java中json转Map,jsonArray转List集合,List集合转json

㈡ java怎么把map转换为json

String jsons=“{‘a’:'1','b':'2'}”;
Map<String, Object> jsonmap=new HashMap<String, Object>();
jsonmap=json.setterObject(jsons, json.setMapType(HashMap.class, String.class, Object.class));///json转map

ObjectMapper mapper = new ObjectMapper();

Object dataparamtemp=jsonmap.get("dataparam");
String dataparam=mapper.writeValueAsString(dataparamtemp);//Map转json
需要
jackson的支持。
当然，这里只是我截取我使用的一点例子，这个需要jar包的支持，我建议你直接搜索：

Java jackson map与json相互转化，而且也可以是bean转json list转json都是可以的。

㈢ 如何把map转成json

把map转成json的步骤：
1、需要一些jar包：json-lib-2.4-jdk15.jar、ezmorph-1.0.6.jar、commons-logging.jar、commons-lang.jar、commons-collections.jar、commons-beanutils.jar。
2、把Map转换成json， 要使用jsonObject对象：
Map<String, Object> map = new HashMap<String, Object>();
map.put("userId", 1001);
map.put("userName", "张三");
map.put("userSex", "男");
JSONObject jsonObject = JSONObject.fromObject(map);
System.out.println(jsonObject);

㈣ map转json的取值问题

Set set=map.KeySet();

㈤ android怎么把json转换为hashmap

在android中把json转换为hashmap，代码如下：
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import net.sf.json.JSONArray;
import net.sf.json.JSONException;
import net.sf.json.JSONObject;

import com.wideyou.model.ExpressOrder;
import com.wideyou.warehouse.model.Storage;

public class HelperFunction {
public ExpressOrder ExpressOrderClassCast(JSONObject reserJson){
ExpressOrder expressOrder=new ExpressOrder();
expressOrder.setCid(Integer.parseInt(reserJson.getString("userId")));
expressOrder.setSendPerson(reserJson.getString("sendPerson"));
expressOrder.setSendPhone(reserJson.getString("sendPhone"));
expressOrder.setSendAddress(reserJson.getString("sendAddress"));
expressOrder.setBeginAddress(reserJson.getString("beginAddress"));
expressOrder.setOtherDes(reserJson.getString("otherDes"));
expressOrder.setEndAddress(reserJson.getString("endAddress"));
expressOrder.setReservPerson(reserJson.getString("reservPerson"));
expressOrder.setReservPhone(reserJson.getString("reservPhone"));
expressOrder.setReservAddress(reserJson.getString("reservAddress"));
expressOrder.setPostCode(reserJson.getString("reservAddress"));
expressOrder.setPayId(Integer.parseInt(reserJson.getString("payId")));
return expressOrder;
}

public Storage StorageClassCast(JSONObject reserJson){
Storage storage=new Storage();
storage.setSname(reserJson.getString("sname"));
storage.setCount(Integer.parseInt(reserJson.getString("count")));
return storage;
}

public static int getCid(JSONObject reserJson, boolean isConsumer){
if(isConsumer){
return Integer.parseInt(reserJson.getString("userId"));
}else{
return Integer.parseInt(reserJson.getString("memberId"));
}
}
//map转换为json字符串
public static String hashMapToJson(HashMap map) {
String string = "{";
for (Iterator it = map.entrySet().iterator(); it.hasNext();) {
Entry e = (Entry) it.next();
string += "'" + e.getKey() + "':";
string += "'" + e.getValue() + "',";
}
string = string.substring(0, string.lastIndexOf(","));
string += "}";
return string;
}

public static void JsonObject2HashMap(JSONObject jo, List> rstList) {
for (Iterator keys = jo.keys(); keys.hasNext();) {
try {
String key1 = keys.next();
System.out.println("key1---" + key1 + "------" + jo.get(key1)
+ (jo.get(key1) instanceof JSONObject) + jo.get(key1)
+ (jo.get(key1) instanceof JSONArray));
if (jo.get(key1) instanceof JSONObject) {

JsonObject2HashMap((JSONObject) jo.get(key1), rstList);
continue;
}
if (jo.get(key1) instanceof JSONArray) {
JsonArray2HashMap((JSONArray) jo.get(key1), rstList);
continue;
}
System.out.println("key1:" + key1 + "----------jo.get(key1):"
+ jo.get(key1));
json2HashMap(key1, jo.get(key1), rstList);

} catch (JSONException e) {
e.printStackTrace();
}
}
}
public static void JsonArray2HashMap(JSONArray joArr,
List> rstList) {
for (int i = 0; i < joArr.size(); i++) {
try {
if (joArr.get(i) instanceof JSONObject) {

JsonObject2HashMap((JSONObject) joArr.get(i), rstList);
continue;
}
if (joArr.get(i) instanceof JSONArray) {

JsonArray2HashMap((JSONArray) joArr.get(i), rstList);
continue;
}
System.out.println("Excepton~~~~~");

} catch (JSONException e) {
e.printStackTrace();
}

}

}
public static void json2HashMap(String key, Object value,
List> rstList) {
HashMap map = new HashMap();
map.put(key, value);
rstList.add(map);
}

}

㈥ map与json的转换

使用fastjson实现map与json的互相转换

new Date()是java.util.Date
这个里面是时间处理的参数
JSON.toJSONString(map,
SerializerFeature.,
SerializerFeature.WriteDateUseDateFormat)

结果

设置JsonObject的默认时间格式
JSONObject.DEFFAULT_DATE_FORMAT="yyyy-MM-dd";

结果

㈦ js解析后台map转成的json方法

JavaBean(以User为例)转成json格式
1.转成JSONArray类型
User user = new User();
user.setUsername("cxl");
user.setPassword("1234");
JSONArray json = JSONArray.fromObject(user);
System.out.println(json);//[{"password":"1234","username":"cxl"}]
response.getWriter().print(json.toString());
在js文件取数据
$.getJSON("http://localhost:8080/jQueryDemo/servlet/UserServlet",null,function(data) {
alert(data[0].username);
alert(data[0].password);
});
2.转成JSONObject类型
JSONObject jsonObj = JSONObject.fromObject(user);
System.out.println(jsonObj);//{"password":"1234","username":"cxl"}
response.getWriter().print(jsonObj);
在js文件取数据
alert(data.username);
alert(data.password);

List转成json格式
List<User> users = new ArrayList<User>();
User user = new User();
user.setUsername("cxl");
user.setPassword("1234");
User u = new User();
u.setUsername("lhl");
u.setPassword("1234");
users.add(user);
users.add(u);
1.转成JSONArray类型
JSONArray json = JSONArray.fromObject(users);
System.out.println(json.toString());
//[{"password":"1234","username":"cxl"},{"password":"1234","username":"lhl"}]
response.getWriter().print(json.toString());
js中取数据：alert(alert(data[0].username));

㈧ android如何将list转化为json

可以通过jsonObject作为中间转换桥梁，先把你的list转换为jsonObject，然后jsonObject toString()，即可转换为json字符串。但是过于复杂的map对象貌似不行，这样你就只有自己写了

㈨ 如何将一个map 转换成json数据

/**
* 返回Json字符串
*
* @param success
* 结果
* @param key
* 键
* @param value
* 值
* @return Json字符串
*/
public static String toJson(boolean success, String key, String value) {
Map<String, String> jsonMap = new HashMap<String, String>();
jsonMap.put(key, value);
return toJson(success, jsonMap);
}

/**
* 返回Json字符串
*
* @param success
* 返回结果
* @param jsonMap
* 需要返回的数据集
* @return Json字符串
*/
public static String toJson(boolean success, Map<String, String> jsonMap) {
StringBuffer buffer = new StringBuffer();
if (success) {
buffer.append("{success:true");
} else {
buffer.append("{success:false");
}

if (jsonMap.size() > 0) {
buffer.append(",");
for (String key : jsonMap.keySet()) {
if (!key.equals("class"))
buffer.append(key + " : '" + jsonMap.get(key) + "',");
}
// 去掉最后一个','
buffer.deleteCharAt(buffer.length() - 1);
}
buffer.append("}");
return buffer.toString();
}