Java 编码 和JSON

Posted 太阳花神

tags:

篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了Java 编码 和JSON相关的知识,希望对你有一定的参考价值。

1.编码

序列化(urlencode编码):经过urlencode编码

        String a="[{\"clubNo\":\"10000002\",\"clubType\":\"1\"},{\"clubNo\":\"10000003\",\"clubType\":\"4\"},{\"clubNo\":\"10000004\",\"clubType\":\"3\"}]";

      将字符串a经过urlencode编码:  a = java.net.URLEncoder.encode(a,"utf-8");

反序列化(urldecode解码)

String a="%5b%7b%22clubNo%22%3a%2210000002%22%2c%22clubType%22%3a%221%22%7d%2c%7b%22clubNo%22%3a%2210000003%22%2c%22clubType%22%3a%224%22%7d%2c%7b%22clubNo%22%3a%2210000004%22%2c%22clubType%22%3a%223%22%7d%5d";

 a=java.net.URLDecoder.decode(a,"UTF-8");

2.JSON

(1)将多个字符串转换成json数据:

 

String a="ert";
String c="kkkk";
JSONObject json=new JSONObject();
json.put("a", a);
json.put("c", c);
System.out.println(json.toJSONString());

{“a”:"ert","c":"kkkk"}

(2)解析json型的字符串:

String datas="{\"imei\":\"358732036143010\",\"version\":\"2.3\",\"apk\":[{\"appname\":\"SyncKey\",\"packagename\":\"com.discovery.synckey\"},{\"appname\":\"DbTest\",\"packagename\":\"com.discovery.synckey\"},{\"appname\":\"AppUpdate\",\"packagename\":\"com.discovery.synckey\"}]}";

JSONObject reqJson=JSONObject.parseObject(datas);

String imei=reqJson.getString("imei");

String apk=reqJson.getString("apk");//json型集合

JSONArray parseArry =JSONObject.parseArray(apk);

Iterator<Object> iterator =parseArry.iterator();

while(iterator.hasNext())
{
  JSONObject object =(JSONObject)iterator.next();

       String  appname =(String)object.getString("appname")

}

(3).

    原数据

datas:  {"hma17-kme-180425dntn":"[email protected]@3","ym800_7.5_18031521":"[email protected]@369"}
解析后的数据
{"maxPage":2,"list":[{"name":"hma17-kme-180425dntn","num":"1531","actnum":"1531","weeknum":"3"},{"name":"ym800_7.5_18031521","num":"745","actnum":"744","weeknum":"369"}]}

JSONObject reqJson=JSON.parseObject(datas);

for(Map.Entry<String, Object> entry:reqJson.entrySet()){
  System.out.println("~!!!!!!!!!!!!!!!!!!!!!");
  System.out.println(entry.getKey());
  System.out.println(entry.getValue());

  String c=(String)entry.getValue();
  String [] res=c.split("@");

  String name=entry.getKey();

  String num=res[0];

  String actNum=res[1];

  String  weekNum=res[2];

}

(4)

String  devices="[email protected]@SNXYQLyR";

String [] res=devices.split("@");

List a=new JSONArray();

  for(int i=1;i<res.length;i++)
  {
              a.add(res[i]);
       }

3.字符串不区分大小写进行比较

 if(res[i].toLowerCase().contains(deviceId.toLowerCase())) //不区分大小写比较是否相等

club.replaceAll("\"\"\"", "\""); //去掉字符串club中的\

a=a.replace("\"", "");//去掉字符串a中的"

4.访问三方的接口

Maven项目中要加依赖:

<dependency>
  <groupId>com.bladejava</groupId>
  <artifactId>blade-kit</artifactId>
  <version>1.3.4</version>
</dependency>

(1)

url="http://"+ipNum+"/wxServer/GetOnlineDeviceID?num=ALL";

HttpRequest req=HttpRequest.get(url);

String content=req.body();  //三方接口返回的内容

(2)post请求

//openIdUrl  具体的url

HttpRequest request = HttpRequest.post(openIdUrl).contentType("application/json;charset=utf-8");  
String res = request.body();  //三方接口返回的内容

JSONObject obj = JSON.parseObject(res);

String access_token=obj.getString("access_token"); //三方接口中具体某个字段值

(3)post请求带有数据型访问三方接口

        //UNURL  具体的url

       HttpRequest request = HttpRequest.post(UNURL).contentType("application/json;charset=utf-8").send(xml);
       returnxml=request.body();

 






























以上是关于Java 编码 和JSON的主要内容,如果未能解决你的问题,请参考以下文章

错误代码:错误域 = NSCocoaErrorDomain 代码 = 3840“JSON 文本没有以数组或对象和允许未设置片段的选项开头。”

使用Code Snippet简化编码

javascript中的JSON字符编码与java不同

Java 编码 和JSON

递进迭代敏捷

JAVA 如何读取JSON编码格式的数据?