Volley之Post

声明:
该文是参照慕客网视频和网友的博客所整理,参考链接如下:
http://www.imooc.com/learn/468
http://www.cnblogs.com/caobotao/p/5071658.htm

实例一:使用Post方式请求数据返回StringRequest对象

使用Post方式需要手动传递请求参数,可以重写Request类的getParams()方法将请求参数名和参数值放入Map中进行传递。

AndroidManifest.xml


<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.learning.volleydemo03">
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:name=".MyApplication">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            intent-filter>
        activity>
    application>
manifest>

MyApplication.java

import android.app.Application;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;

public class MyApplication extends Application {
    public static RequestQueue queue;

   @Override
    public void onCreate() {
        super.onCreate();
        queue = Volley.newRequestQueue(getApplicationContext());
    }

   public static RequestQueue getHttpQueue(){
        return queue;
    }
}

MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;

import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        volley_Post();
    }
/**
     * 使用Post方式返回String类型的请求结果数据
     *  new StringRequest(int method,String url,
     *             Listener listener,
     *             ErrorListener errorListener)
     * 
     *  method:请求方式
     *         Get请求为Method.GET
     *         Post请求为Method.POST
     *  url:请求地址
     *  listener:请求成功后的回调
     *  errorListener:请求失败的回调
     */
    public void volley_Post(){
        String url = "https://tcc.taobao.com/cc/json/mobile_tel_segment.htm";
        StringRequest request = new StringRequest(Request.Method.POST, url,
                new Response.Listener() {
                    @Override
                    public void onResponse(String s) {
                        Toast.makeText(MainActivity.this, s, Toast.LENGTH_SHORT).show();
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                Toast.makeText(MainActivity.this, volleyError.toString(), Toast.LENGTH_SHORT).show();
            }
        }){
            //getParams()方法:
            //用户在Volley中使用Post方式请求数据中参数的传递
            @Override
            protected Map getParams() throws AuthFailureError {
                Map hashMap = new HashMap();
                //将请求参数名与参数值放入map中
                hashMap.put("tel","15333333333");
                return hashMap;
            }
        };
        //设置请求的Tag标签,可以在全局请求队列中通过Tag标签进行请求的查找
        request.setTag("abcPost");
        //将请求加入全局队列中
        MyApplication.getHttpQueue().add(request);
    }
}

运行结果:
Volley之Post_第1张图片

实例二:使用Post方式请求数据返回JsonObject对象

修改上面的MainActivity.java
MainActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;

import org.json.JSONObject;

import java.util.HashMap;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        volley_Post();
    }

    public void volley_Post() {
        String url = "http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json";
        HashMap hashMap = new HashMap();
        hashMap.put("tel","15399999999");
        //将hashMap转化为一个JSONObject对象
        JSONObject object = new JSONObject(hashMap);
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, url,object,
                new Response.Listener() {
                    @Override
                    public void onResponse(JSONObject jsonObject) {
                        Toast.makeText(MainActivity.this,jsonObject.toString(), Toast.LENGTH_SHORT).show();
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                Toast.makeText(MainActivity.this, volleyError.toString(), Toast.LENGTH_SHORT).show();
            }
        });
        request.setTag("abcPost");
        MyApplication.getHttpQueue().add(request);
    }
}

运行结果:
Volley之Post_第2张图片

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