安卓解析 json 4种格式 全解析

总共4种json  ，    还提供了 httclient  和 httpurlconnection 2种方式获取json的方法(请把baseurl 改为可以地址比如http://www.sohu.com 不过返回来的不是json

1  简单的一个  { ，，，，}

2  里面有数组 { , [{,,},{,,}],}  

3 直接一个数组

4 数组里有数组

5 其他情况？ 没有吧，除非json格式不规范

主代码：

package com.example.json;

import java.net.URL;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {

  
 private Button btn2;
 private Button btn3;
 private Button btn4;
 private Button btn5;
 private Button btn6;
 private Button btn7;
 
 private TextView txt1;
 private      String baseUrl="http://ip:8088/ship/servlet/getposinfo";
 private  String str=""; 
    private Handler handler=new Handler()
    {
 
  @Override
  public void handleMessage(Message msg) {
      
 //  返回的字符串 直接是个数组
  // [{"devid":"1234567800","latitude":"29.4963","longitude":"116.189","postime":"2014-06-10 12:13:00"},
     // {"devid":"1234567832","latitude":"29.4943","longitude":"1161.129","postime":"2014-06-11 12:13:00"}]
   if (msg.what==1)
   {
    Log.v("zms","使用httpclient,返回的json");
    try {
     JSONArray jsonArray = new JSONArray(String.valueOf(msg.obj));
         txt1.setText(" ");
         str="httpclient:";
     for (int i=0;i<jsonArray.length();i++)
     {
        JSONObject jsonObject2 = (JSONObject)jsonArray.opt(i); 
         str=str+"第"+i+"个,devid:"+jsonObject2.getString("devid")+"维度:"+jsonObject2.getString("latitude")+" ";
        txt1.setText(str);
        Log.v("zms", str);
     }
    } catch (JSONException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    } 
   }
   else if (msg.what==2)
   {
    Log.v("zms","使用httpurlconnection返回的json");
    try {
     JSONArray jsonArray = new JSONArray(String.valueOf(msg.obj));
         txt1.setText(" ");
         str="urlconnect:";
     for (int i=0;i<jsonArray.length();i++)
     {
        JSONObject jsonObject2 = (JSONObject)jsonArray.opt(i); 
         str=str+"第"+i+"个,devid:"+jsonObject2.getString("devid")+"维度:"+jsonObject2.getString("latitude")+" ";
        txt1.setText(str);
        Log.v("zms", str);
     }
    } catch (JSONException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    } 
   }
   
   super.handleMessage(msg);
  }
     
    };
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  txt1=(TextView)findViewById(R.id.textView1);
  
 
  
  //最简单 的 直接一个对象
  btn2=(Button)findViewById(R.id.button2);
  btn2.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    txt1.setText("");
    str="";
    try {
     // {"username":"zms",age:23,"addr","from china"};
     String json="{"username":"zms","age":43,"addr":"江西省高安市村前镇"}";
        JSONObject jsonObject2 =new JSONObject(json);
         str="名字:"+jsonObject2.getString("username")+"年薪:"+jsonObject2.getString("age")+jsonObject2.getString("addr")+" ";
        txt1.setText(str);
        Log.v("zms", str);
      
    } catch (JSONException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    } 
     
   }
  });
  
  //对象里有数组
  btn3=(Button)findViewById(R.id.button3);
  btn3.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    txt1.setText("");
    str="";
    try {
     //{"username":"zms",age:11,"jicheng":[{"zhengshu":"PMP","date":"2011年"},{"zhengshu":"信息系统项目管理师","date","2012年"}],"addr":"江西"}
     // 这种也属于 对象里有数组   {"json":[{"username":"zms","date":"2011年"},{"username":"ivy","date","2012年"}]}
String json= "{"username":"张木生",age:11,"jicheng":[{"zhengshu":"PMP","date":"2011年"},{"zhengshu":"信息系统项目管理师","date":"2012年"}],"addr":"江西"}";
      
            JSONObject jsonObject2 =new JSONObject(json);
         str="名字:"+jsonObject2.getString("username");
         str=str+"工龄:"+jsonObject2.getString("age")+"证书:";
         JSONArray jsonArray = jsonObject2.getJSONArray("jicheng"); 
         for (int i=0;i<jsonArray.length();i++)
         {
          JSONObject jsonObjectSon= (JSONObject)jsonArray.opt(i); 
          str=str+jsonObjectSon.getString("zhengshu")+"年份："+jsonObjectSon.getString("date");
         }
         str=str+"籍贯"+jsonObject2.getString("addr");
          txt1.setText(str);
         Log.v("zms", str);
      
    } catch (JSONException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    } 
     
   }
  });
  
  //直接一个数组 
  btn4=(Button)findViewById(R.id.button4);
  btn4.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    Log.v("zms","响应4");
    txt1.setText("");
    str="";
    //  返回的字符串 直接是个数组
    // [{"devid":"1234567800","latitude":"29.4963","longitude":"116.189"},{"devid":"1234567832","latitude":"29.4943","longitude":"1161.129"}]
 String json="[{"devid":"1234567800","latitude":"29.4963","longitude":"116.189"},{"devid":"1234567832","latitude":"29.4943","longitude":"1161.129"}]";
     try {
      JSONArray jsonArray = new JSONArray(json);
      for (int i=0;i<jsonArray.length();i++)
      {
         JSONObject jsonObject2 = (JSONObject)jsonArray.opt(i); 
    str=str+"第"+i+"个,devid:"+jsonObject2.getString("devid")+"维度:"+jsonObject2.getString("latitude")+"经度:"+jsonObject2.getString("longitude")+" ";
        
      }
       txt1.setText(str);
        Log.v("zms", str);
     } catch (JSONException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     } 
     
     
   }
  });
  
  //数组里有数组
    btn5=(Button)findViewById(R.id.button5);
    btn5.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
       
      txt1.setText("");
      str="";
      //  返回的字符串 直接是个数组
   /*   [
      {"devid":"1234567800","gps":[{"time":"2014-11-12","latitude":"29.4963","longitude":"116.189"},{"time":"2014-11-12","latitude":"29.4963","longitude":"116.189" }],"devname":"赣01"},
       {"devid":"1234567800","gps":[{"time":"2014-11-12","latitude":"29.4963","longitude":"116.189"},{"time":"2014-11-12","latitude":"29.4963","longitude":"116.189" }],"devname":"赣92"},
       {"devid":"1234567800","gps":[{"time":"2014-11-12","latitude":"29.4963","longitude":"116.189"},{"time":"2014-11-12","latitude":"29.4963","longitude":"116.189" }],"devname":"赣43"},
       ], */
   String json="["+
               "{"devid":"1234567800","gps":[{"time":"2014-11-12","latitude":"29.4963","longitude":"116.189"},{"time":"2014-11-12","latitude":"29.4963","longitude":"116.189" }],"devname":"赣01"},"+
               " {"devid":"1234567800","gps":[{"time":"2014-11-12","latitude":"29.4963","longitude":"116.189"},{"time":"2014-11-12","latitude":"29.4963","longitude":"116.189" }],"devname":"赣92"},"+
               " {"devid":"1234567800","gps":[{"time":"2014-11-12","latitude":"29.4963","longitude":"116.189"},{"time":"2014-11-12","latitude":"29.4963","longitude":"116.189" }],"devname":"赣43"}"+
               "]";
       try {
        JSONArray jsonArray = new JSONArray(json);
        for (int i=0;i<jsonArray.length();i++)
        {
          String tpstr="";
           JSONObject jsonObject5 = (JSONObject)jsonArray.opt(i); 
           str=str+"第"+i+"条船，设备号devid:"+jsonObject5.getString("devid");
           JSONArray jsonArray5 = jsonObject5.getJSONArray("gps"); 
           for (int j=0;j<jsonArray5.length();j++)
           {
            JSONObject jsonOb5Son=(JSONObject)jsonArray5.opt(j);
             tpstr="采集时间:"+jsonOb5Son.getString("time")+"维度"+jsonOb5Son.getString("latitude")+"经度:"+jsonOb5Son.getString("longitude");
            
           }
           str=str+tpstr;
       
          
        }
         txt1.setText(str);
          Log.v("zms", str);
       } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
       } 
       
       
     }
    }); 
    
    //httpclient访问网络返回json
    btn6=(Button)findViewById(R.id.button6);
    btn6.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
      txt1.setText("");
       /*从安卓3.0以后，就不允许在主线程中直接访问网络，必须在子线程中访问
       访问后要修改主线程的UI，需要使用handler通信*/
       accessThread1 mythread1=new accessThread1();
       mythread1.start();
     }
    });
    
    //httpurlconnection访问网络返回json
    btn7=(Button)findViewById(R.id.button7);
    btn7.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
      txt1.setText("");
       /*从安卓3.0以后，就不允许在主线程中直接访问网络，必须在子线程中访问
       访问后要修改主线程的UI，需要使用handler通信*/
       accessThread2 mythread2=new accessThread2();
       mythread2.start();
     }
    });
  
 }
 
 class   accessThread1 extends Thread{
 
  @Override
  public void run() {
 
   Log.v("zms","线程accessThread开始");
   Message msg1=handler.obtainMessage();
   msg1.what=1;
   msg1.obj=util.getHttpJsonByhttpclient(baseUrl);
   handler.sendMessage(msg1);
   super.run();
  }
  
 }
 
 class   accessThread2 extends Thread{
   
  @Override
  public void run() {
 
   Log.v("zms","线程accessThread2开始");
   
   Message msg2=handler.obtainMessage();
   msg2.what=2;
   msg2.obj=util.getHttpJsonByurlconnection(baseUrl);
   handler.sendMessage(msg2);
   super.run();
  }
  
 }
 
 

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

}

-------------------------------------------------------------------------------------------------------------------------------

layout XMl文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity" >
 
 <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
    
    <Button
        android:id="@+id/button2"
             android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="直接一个对象" />

    <Button
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="对象里有数组" />

    <Button
        android:id="@+id/button4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="直接一个数组" />
    
        <Button
        android:id="@+id/button5"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="数组里还有数组" />
        
        
    <Button
        android:id="@+id/button6"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="httpclient获取json" />
    
     <Button
        android:id="@+id/button7"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="httpurlconnection获取json" />
    
       
</LinearLayout>

公共服务类  util  里面2个静态方法 用来 返回 json 字符串

package com.example.json;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
 
import android.util.Log;

public class util {
 
 public static String  getHttpJsonByhttpclient(String  fromurl)
 {
     
   try{
         Log.v("zms","使用httget");
            HttpGet geturl=new HttpGet(fromurl);
            DefaultHttpClient httpclient=new DefaultHttpClient();
         HttpResponse response=httpclient.execute(geturl);
          Log.v("zms","响应码"+response.getStatusLine().getStatusCode());
           if (response.getStatusLine().getStatusCode()==200)
           {
             
               String returnStr=EntityUtils.toString(response.getEntity(),"utf-8");
            Log.v("zms","返回值"+returnStr);
               return returnStr;
           } else
           {
            Log.v("zms","访问网络返回数据失败，错误码:"+response.getStatusLine().getStatusCode());
           }
       
        } 
        catch(IOException e)
        {
         e.printStackTrace();
        } 
   return null;
  
 }
 
 public static String  getHttpJsonByurlconnection(String fromurl)
 {
  try
  {
   Log.v("zms","使用httpurlconnection");
   ByteArrayOutputStream os=new ByteArrayOutputStream();
   byte[] data =new byte[1024];
   int len=0; 
   URL url=new URL(fromurl);
   HttpURLConnection conn=(HttpURLConnection)url.openConnection();
   InputStream in=conn.getInputStream();
   while ((len=in.read(data))!=-1)
   {
    os.write(data,0,len);
   }
   in.close();
   return new String(os.toByteArray());
  } catch (Exception e)
  {
   e.printStackTrace();
  }
 
  return null;
 }

}