安卓解析 json 4种格式 全解析
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 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")+"\n";
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")+"\n";
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")+"\n";
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")+"\n";
}
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;
}
}
