Android之解析JSON数据示例（android原生态，FastJson，Gson）

1.json网页代码

<%@ page language="java" contenttype="text/plain; charset=utf-8"
 pageencoding="utf-8"%><%@page iselignored="false" %>${fqs }

2.json数据网页效果图

3.android代码

布局

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">

 <button
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="获取json数据"
  android:onclick="getjson"/>

 <listview
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:id="@+id/lv_json_main"></listview>
</linearlayout>

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main_fastjson"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">

 <button
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="获取json数据fastjson"
  android:onclick="getfastjson"/>

 <listview
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:id="@+id/lv_fastjson_main"></listview>
</linearlayout>

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main_gson"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">

 <button
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="获取json数据gson"
  android:onclick="getgson"/>

 <listview
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:id="@+id/lv_gson_main"></listview>
</linearlayout>

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="horizontal">

 <textview
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:id="@+id/tv_item_listview_name"
  android:layout_weight="1"/>

 <textview
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:id="@+id/tv_item_listview_content"
  android:layout_weight="1"/>

 <textview
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:id="@+id/tv_item_listview_time"
  android:layout_weight="1"/>
</linearlayout>

android原生态代码解析

public class mainactivity extends appcompatactivity {

 private listview lv_json_main;
 private list<fq> fqs = new arraylist<>();
 private myadapter myadapter;
 private progressdialog progressdialog;

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);
  lv_json_main = (listview) findviewbyid(r.id.lv_json_main);
  myadapter = new myadapter();
  lv_json_main.setadapter(myadapter);

  progressdialog = new progressdialog(this);
  progressdialog.setmessage("小青正在拼命加載中.....");
 }

 class myadapter extends baseadapter {

  @override
  public int getcount() {
   return fqs.size();
  }

  @override
  public object getitem(int position) {
   return fqs.get(position);
  }

  @override
  public long getitemid(int position) {
   return position;
  }

  @override
  public view getview(int position, view convertview, viewgroup parent) {
   if (convertview == null) {
    convertview = layoutinflater.from(mainactivity.this).inflate(r.layout.item_list, null);
    itemtag itemtag = new itemtag();
    itemtag.tv_name = (textview) convertview.findviewbyid(r.id.tv_item_listview_name);
    itemtag.tv_content = (textview) convertview.findviewbyid(r.id.tv_item_listview_content);
    itemtag.tv_tiem = (textview) convertview.findviewbyid(r.id.tv_item_listview_time);
    convertview.settag(itemtag);
   }
   itemtag itemtag = (itemtag) convertview.gettag();
   itemtag.tv_name.settext(fqs.get(position).getname());
   itemtag.tv_content.settext(fqs.get(position).getcontent());
   itemtag.tv_tiem.settext(fqs.get(position).gettime());

   return convertview;
  }
 }

 public void getjson(view view) {
  new mytask().execute();
 }

 class mytask extends asynctask {

  //获取数据前
  @override
  protected void onpreexecute() {
   super.onpreexecute();
   progressdialog.show();
  }

  @override
  protected object doinbackground(object[] params) {
   string path = "http://192.168.43.149:8080/datajson.xhtml";
   try {
    url url = new url(path);
    httpurlconnection connection = (httpurlconnection) url.openconnection();
    connection.setrequestmethod("get");
    connection.setconnecttimeout(5000);
    if (connection.getresponsecode() == 200) {
     inputstream is = connection.getinputstream();
     //读
     bufferedreader br=new bufferedreader(new inputstreamreader(is));
     stringbuffer stringbuffer = new stringbuffer();
     string str=null;
     while ((str=br.readline())!=null){
      //拼接字符串
      stringbuffer.append(str);
     }
     //使用原生态解析json数据
     jsonobject jsonobject=new jsonobject(stringbuffer.tostring());
     string clazz=jsonobject.getstring("clazz");
     int lists=jsonobject.getint("lists");
     jsonarray jsonarray=jsonobject.getjsonarray("fqs");
     for (int i = 0; i < jsonarray.length(); i++) {
      jsonobject object=jsonarray.getjsonobject(i);
      string name=object.getstring("name");
      string content=object.getstring("content");
      string time=object.getstring("time");
      fq fq=new fq(name,content,time);
      fqs.add(fq);
     }
    }
   } catch (exception e) {
    e.printstacktrace();
   }
   return null;
  }

  //获取数据后更新ui
  @override
  protected void onpostexecute(object o) {
   super.onpostexecute(o);
   progressdialog.cancel();
   myadapter.notifydatasetchanged();
  }
 }
}

使用fastjson解析

public class mainfastjsonactivity extends appcompatactivity {

 private listview lv_fastjson_main;
 private list<fq> fqs = new arraylist<>();
 private myadapter myadapter;
 private progressdialog progressdialog;

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main_fastjson);
  lv_fastjson_main = (listview) findviewbyid(r.id.lv_fastjson_main);
  myadapter = new myadapter();
  lv_fastjson_main.setadapter(myadapter);

  progressdialog = new progressdialog(this);
  progressdialog.setmessage("小青正在拼命加載中.....");
 }

 class myadapter extends baseadapter {

  @override
  public int getcount() {
   return fqs.size();
  }

  @override
  public object getitem(int position) {
   return fqs.get(position);
  }

  @override
  public long getitemid(int position) {
   return position;
  }

  @override
  public view getview(int position, view convertview, viewgroup parent) {
   if (convertview == null) {
    convertview = layoutinflater.from(mainfastjsonactivity.this).inflate(r.layout.item_list, null);
    itemtag itemtag = new itemtag();
    itemtag.tv_name = (textview) convertview.findviewbyid(r.id.tv_item_listview_name);
    itemtag.tv_content = (textview) convertview.findviewbyid(r.id.tv_item_listview_content);
    itemtag.tv_tiem = (textview) convertview.findviewbyid(r.id.tv_item_listview_time);
    convertview.settag(itemtag);
   }
   itemtag itemtag = (itemtag) convertview.gettag();
   itemtag.tv_name.settext(fqs.get(position).getname());
   itemtag.tv_content.settext(fqs.get(position).getcontent());
   itemtag.tv_tiem.settext(fqs.get(position).gettime());

   return convertview;
  }
 }

 public void getfastjson(view view) {
  new mytask().execute();
 }

 class mytask extends asynctask {

  //获取数据前
  @override
  protected void onpreexecute() {
   super.onpreexecute();
   progressdialog.show();
  }

  @override
  protected object doinbackground(object[] params) {
   string path = "http://192.168.43.149:8080/datajson.xhtml";
   try {
    url url = new url(path);
    httpurlconnection connection = (httpurlconnection) url.openconnection();
    connection.setrequestmethod("get");
    connection.setconnecttimeout(5000);
    if (connection.getresponsecode() == 200) {
     inputstream is = connection.getinputstream();
     //读
     bufferedreader br=new bufferedreader(new inputstreamreader(is));
     stringbuffer stringbuffer = new stringbuffer();
     string str=null;
     while ((str=br.readline())!=null){
      //拼接字符串
      stringbuffer.append(str);
     }
     //使用fastjson解析json数据
     bigfq bigfq=json.parseobject(stringbuffer.tostring(),bigfq.class);
     string clazz=bigfq.getclazz();
     int num=bigfq.getlists();
     fqs.addall(bigfq.getfqs());
    }
   } catch (exception e) {
    e.printstacktrace();
   }
   return null;
  }

  //获取数据后更新ui
  @override
  protected void onpostexecute(object o) {
   super.onpostexecute(o);
   progressdialog.cancel();
   myadapter.notifydatasetchanged();
  }
 }
}

使用gson解析

public class maingsonactivity extends appcompatactivity {

 private listview lv_gson_main;
 private list<fq> fqs = new arraylist<>();
 private myadapter myadapter;
 private progressdialog progressdialog;

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main_gson);
  lv_gson_main = (listview) findviewbyid(r.id.lv_gson_main);
  myadapter = new myadapter();
  lv_gson_main.setadapter(myadapter);

  progressdialog = new progressdialog(this);
  progressdialog.setmessage("小青正在拼命加載中.....");
 }

 class myadapter extends baseadapter {

  @override
  public int getcount() {
   return fqs.size();
  }

  @override
  public object getitem(int position) {
   return fqs.get(position);
  }

  @override
  public long getitemid(int position) {
   return position;
  }

  @override
  public view getview(int position, view convertview, viewgroup parent) {
   if (convertview == null) {
    convertview = layoutinflater.from(maingsonactivity.this).inflate(r.layout.item_list, null);
    itemtag itemtag = new itemtag();
    itemtag.tv_name = (textview) convertview.findviewbyid(r.id.tv_item_listview_name);
    itemtag.tv_content = (textview) convertview.findviewbyid(r.id.tv_item_listview_content);
    itemtag.tv_tiem = (textview) convertview.findviewbyid(r.id.tv_item_listview_time);
    convertview.settag(itemtag);
   }
   itemtag itemtag = (itemtag) convertview.gettag();
   itemtag.tv_name.settext(fqs.get(position).getname());
   itemtag.tv_content.settext(fqs.get(position).getcontent());
   itemtag.tv_tiem.settext(fqs.get(position).gettime());

   return convertview;
  }
 }

 public void getgson(view view) {
  new mytask().execute();
 }

 class mytask extends asynctask {

  //获取数据前
  @override
  protected void onpreexecute() {
   super.onpreexecute();
   progressdialog.show();
  }

  @override
  protected object doinbackground(object[] params) {
   string path = "http://192.168.43.149:8080/datajson.xhtml";
   try {
    url url = new url(path);
    httpurlconnection connection = (httpurlconnection) url.openconnection();
    connection.setrequestmethod("get");
    connection.setconnecttimeout(5000);
    if (connection.getresponsecode() == 200) {
     inputstream is = connection.getinputstream();
     //读
     bufferedreader br=new bufferedreader(new inputstreamreader(is));
     stringbuffer stringbuffer = new stringbuffer();
     string str=null;
     while ((str=br.readline())!=null){
      //拼接字符串
      stringbuffer.append(str);
     }
     //使用gson解析json数据
     gson gson=new gson();
     bigfq bigfq=gson.fromjson(stringbuffer.tostring(),bigfq.class);
     string clazz=bigfq.getclazz();
     int num=bigfq.getlists();
     fqs.addall(bigfq.getfqs());
     log.i("哈哈","6");
    }
   } catch (exception e) {
    e.printstacktrace();
   }
   return null;
  }

  //获取数据后更新ui
  @override
  protected void onpostexecute(object o) {
   super.onpostexecute(o);
   progressdialog.cancel();
   myadapter.notifydatasetchanged();
  }
 }
}

实体类

public class bigfq {
 private string clazz;
 private int lists;
 private list<fq> fqs;

 public bigfq() {
 }

 public bigfq(string clazz, list<fq> fqs, int lists) {
  this.clazz = clazz;
  this.fqs = fqs;
  this.lists = lists;
 }

 public string getclazz() {
  return clazz;
 }

 public void setclazz(string clazz) {
  this.clazz = clazz;
 }

 public list<fq> getfqs() {
  return fqs;
 }

 public void setfqs(list<fq> fqs) {
  this.fqs = fqs;
 }

 public int getlists() {
  return lists;
 }

 public void setlists(int lists) {
  this.lists = lists;
 }
}


public class fq {
 private string name;
 private string content;
 private string time;

 public fq(){}
 public fq(string name, string time, string content) {
  this.name = name;
  this.time = time;
  this.content = content;
 }

 public string getname() {
  return name;
 }

 public void setname(string name) {
  this.name = name;
 }

 public string getcontent() {
  return content;
 }

 public void setcontent(string content) {
  this.content = content;
 }

 public string gettime() {
  return time;
 }

 public void settime(string time) {
  this.time = time;
 }
}


public class itemtag {
 public textview tv_name;
 public textview tv_content;
 public textview tv_tiem;
}

添加联网权限

 <!--添加联网权限-->
 <uses-permission android:name="android.permission.internet" />

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。