android怎么遍历jsonobject

Posted 2023-03-28

参考技术A android 读取json数据（遍历JSONObject和JSONArray）
•public String getJson()

• String jsonString = "\"FLAG\":\"flag\",\"MESSAGE\":\"SUCCESS\",\"name\":[\"name\":\"jack\",\"name\":\"lucy\"]";//json字符串
• try
• JSONObject result = new JSONObject(jsonstring);//转换为JSONObject
• int num = result.length();
• JSONArray nameList = result.getJSONArray("name");//获取JSONArray
• int length = nameList.length();
• String aa = "";
• for(int i = 0; i < length; i++)//遍历JSONArray
• Log.d("debugTest",Integer.toString(i));
• JSONObject oj = nameList.getJSONObject(i);
• aa = aa + oj.getString("name")+"|";
•
•
• Iterator<?> it = result.keys();
• String aa2 = "";
• String bb2 = null;
• while(it.hasNext())//遍历JSONObject
• bb2 = (String) it.next().toString();
• aa2 = aa2 + result.getString(bb2);
•
•
• return aa;
• catch (JSONException e)
• throw new RuntimeException(e);
•
•

fastjson中JSONObject遍历怎么不是有序的

参考技术A 要使用Fastjson，首先需要下载相对应的jar文件，在官网即可下载。
附上初学的第一个例子，多多指教：

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"statuses":[

"id": 912345678901,
"text": "How do I stream JSON in Java?",
"geo": null,
"user":
"name": "json_newb",
"followers_count": 41

,


"id": 777777777888,
"text": "dfngsdnglnsldfnsl",
"geo": null,
"user":
"name": "dsfgpd",
"followers_count": 24


]

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AllBean的Bean类：

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package com.lee.JsonToBean;

public class AllBean
private long id;
private String text;
private String geo;
private UserBean userBean;
public long getId()
return id;

public void setId(long id)
this.id = id;

public String getText()
return text;

public void setText(String text)
this.text = text;

public String getGeo()
return geo;

public void setGeo(String geo)
this.geo = geo;

public UserBean getUserBean()
return userBean;

public void setUserBean(UserBean userBean)
this.userBean = userBean;



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UserBean的Bean类：

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package com.lee.JsonToBean;

public class UserBean
private String name;
private int followers_count;
public String getName()
return name;

public void setName(String name)
this.name = name;

public int getFollowers_count()
return followers_count;

public void setFollowers_count(int followers_count)
this.followers_count = followers_count;


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解析类JsonBean：

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package com.lee.JsonToBean;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.List;

import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.rtf.RTFEditorKit;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

/**
*
"statuses":[

"id": 912345678901,
"text": "How do I stream JSON in Java?",
"geo": null,
"user":
"name": "json_newb",
"followers_count": 41

,


"id": 777777777888,
"text": "dfngsdnglnsldfnsl",
"geo": null,
"user":
"name": "dsfgpd",
"followers_count": 24


]

* */
public class JsonBean
RTFEditorKit rtf;
DefaultStyledDocument dsd;
String text;
public static void main(String[] args)
JsonBean bean = new JsonBean();
// 把字符串转为Json对象，这是因为我的json数据首先是json对象
JSONObject jobj = JSON.parseObject(bean.readRtf(new File("json.rtf")));
// 然后是jsonArray，可以根据我的json数据知道
JSONArray arr = jobj.getJSONArray("statuses");
// 根据Bean类的到每一个json数组的项
List<AllBean> listBeans = JSON.parseArray(arr.toString(), AllBean.class);
// 遍历
for(AllBean bean_ : listBeans)
// 我这个demo的json数据获得第一层的数据
System.out.println(bean_.getText());
System.out.println(bean_.getId());
// 我这个demo的json数据获得第二层的数据
System.out.println(bean_.getUserBean().getFollowers_count());



// 因为我把json数据放进rtf文件,这是读取rtf文件的json数据，转化为字符串
public String readRtf(File in)
rtf=new RTFEditorKit();
dsd=new DefaultStyledDocument();
try
rtf.read(new FileInputStream(in), dsd, 0);
text = new String(dsd.getText(0, dsd.getLength()));
catch (FileNotFoundException e)
// TODO Auto-generated catch block
e.printStackTrace();
catch (IOException e)
// TODO Auto-generated catch block
e.printStackTrace();
catch (BadLocationException e)
// TODO Auto-generated catch block
e.printStackTrace();

return text;

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