Http两种请求
来源：互联网 发布：嘉靖和万历知乎 编辑：程序博客网 时间：2024/05/17 22:45
MainActivity
package com.example.fragment;import android.os.AsyncTask;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.ListView;import android.widget.ProgressBar;import com.google.gson.Gson;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.conn.ssl.AllowAllHostnameVerifier;import org.apache.http.conn.ssl.SSLSocketFactory;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity { private ListView listView; private ProgressBar progressBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button btnClient = (Button) findViewById(R.id.btn_client); Button btnUrl = (Button) findViewById(R.id.btn_url); listView = (ListView) findViewById(R.id.lv); progressBar=(ProgressBar) findViewById(R.id.progressBar); //初使化为 看不见的状态 progressBar.setVisibility(View.INVISIBLE); btnClient.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //执行异步任务 MyTask myTask = new MyTask(); myTask.execute(new String[]{"https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=30", "1"}); } }); btnUrl.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //执行异步任务 MyTask myTask = new MyTask(); myTask.execute(new String[]{"https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=30", "2"}); } }); } class MyTask extends AsyncTask<String, Void, String> { @Override protected String doInBackground(String... params) { String resultStr = ""; //得到请求的类型 String type = params[1]; if ("1".equals(type)) {//如果是"1" 执行 HttpGet请求 //因为请求的是https协议的网址，eclipse下使用HttpGet请求会报错，需要添加以下这行代码 SSLSocketFactory.getSocketFactory().setHostnameVerifier(new AllowAllHostnameVerifier()); //1.创建一个HttpClient对象 HttpClient hc = new DefaultHttpClient(); //2.创建httpGet对象 HttpGet hg = new HttpGet(params[0]); try { //3.执行请求 HttpResponse response = hc.execute(hg); //4.判断结果码 int code = response.getStatusLine().getStatusCode(); if (code == 200) { //5.得到请求的结果 HttpEntity result = response.getEntity(); resultStr = EntityUtils.toString(result); } } catch (IOException e) { e.printStackTrace(); } } else if ("2".equals(type)) {//如果是2执行 HttpUrlConnection请求 try { //1.创建Url对象 URL url = new URL(params[0]); //2.打开连接 HttpURLConnection connection = (HttpURLConnection) url.openConnection(); //3.设置 connection.setRequestMethod("GET"); connection.setConnectTimeout(5000); connection.setReadTimeout(5000); //4.得到响应码，进行判断 int code = connection.getResponseCode(); if (code == 200) { //5.得到结果 InputStream inputStream = connection.getInputStream(); resultStr =streamToString(inputStream); } } catch (Exception ex) { ex.printStackTrace(); } } else { } return resultStr; } @Override protected void onPostExecute(String s) { super.onPostExecute(s); Log.d("zzz", s); //进行解析，并显示到listView上// Gson gson=new Gson();// ResultBean resultBean=gson.fromJson(s,ResultBean.class); List<News> newsList=new ArrayList<News>(); try { JSONObject obj=new JSONObject(s); JSONArray array=obj.optJSONArray("newslist"); for(int i=0;i<array.length();i++){ JSONObject news=array.optJSONObject(i); News ns=new News(); ns.setCtime(news.optString("ctime")); ns.setDescription(news.optString("description")); ns.setPicUrl(news.optString("picUrl")); ns.setTitle(news.optString("title")); ns.setUrl(news.optString("url")); newsList.add(ns); } } catch (JSONException e) { e.printStackTrace(); } //设置listview的适配器 MyLvAdapter adapter=new MyLvAdapter(newsList,MainActivity.this); listView.setAdapter(adapter); //请求完成时，进度条控件为不可见状态 progressBar.setVisibility(View.INVISIBLE); //请求完成时，设置listview为可见状态 listView.setVisibility(View.VISIBLE); } @Override protected void onPreExecute() { super.onPreExecute(); //设置进度条为显示的状态 progressBar.setVisibility(View.VISIBLE); //设置listview为不可见状态 listView.setVisibility(View.INVISIBLE); } } /** * 将流转换成字符串 * @param stream * @return */ public String streamToString(InputStream stream) { StringBuilder builder = new StringBuilder(); try { BufferedReader br = new BufferedReader(new InputStreamReader(stream, "utf-8")); String con; while ((con = br.readLine()) != null) { builder.append(con); } } catch (Exception ex) { ex.printStackTrace(); } return builder.toString(); }}
MyLvAdapter
package com.example.fragment;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.AsyncTask;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.List;/** * Created by e531 on 2017/10/8. */public class MyLvAdapter extends BaseAdapter { //数据源 private List<News> newsList; private Context context; public MyLvAdapter(List<News> newsList, Context context) { this.newsList = newsList; this.context = context; } public int getCount() { return newsList.size(); } @Override public Object getItem(int position) { return newsList.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if(convertView==null){ convertView=View.inflate(context,R.layout.item,null); holder=new ViewHolder(); holder.tvDate= (TextView) convertView.findViewById(R.id.tv_date); holder.tvTitle= (TextView) convertView.findViewById(R.id.tv_title); holder.img= (ImageView) convertView.findViewById(R.id.img); convertView.setTag(holder); Log.d("zzz","if--"+position+""); }else{ holder=(ViewHolder) convertView.getTag(); Log.d("zzz","else--"+position+""); } //进行赋值 holder.tvDate.setText(newsList.get(position).getCtime()); holder.tvTitle.setText(newsList.get(position).getTitle()); //通过预设图片以及设置tag的方法，来解决图片异步请求错位闪烁的问题 //预设一张图片 holder.img.setImageResource(R.mipmap.ic_launcher); if(newsList.get(position).getPicUrl()!=null){ //给img设置tag,具有唯一性;图片的url -url有时是相同的，所以tag的值最好改为position holder.img.setTag(newsList.get(position).getPicUrl()); //图片的异步请求 MyPicTask myPicTask=new MyPicTask(holder.img); myPicTask.execute(newsList.get(position).getPicUrl()); } return convertView; } static class ViewHolder{ ImageView img; TextView tvTitle; TextView tvDate; } class MyPicTask extends AsyncTask<String,Void,Bitmap>{ private ImageView img; private String imgUrl; public MyPicTask(ImageView img){ this.img=img; } @Override protected Bitmap doInBackground(String... params) { try { imgUrl=params[0]; URL url=new URL(params[0]); HttpURLConnection connection=(HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); connection.setReadTimeout(5000); connection.setConnectTimeout(5000); int code=connection.getResponseCode(); if(code==200){ InputStream inputStream=connection.getInputStream(); Bitmap bitmap=BitmapFactory.decodeStream(inputStream); return bitmap; } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(Bitmap bitmap) { super.onPostExecute(bitmap); if(bitmap!=null){ //进行对比 String tag=(String) img.getTag(); if(tag.equals(imgUrl)){ //显示一下 img.setImageBitmap(bitmap); } } } }}
bean
Newspackage com.example.fragment;/** * Created by e531 on 2017/10/8. */public class News { private String ctime; private String description; private String picUrl; private String title; private String url; @Override public String toString() { return "New{" + "ctime='" + ctime + '\'' + ", description='" + description + '\'' + ", picUrl='" + picUrl + '\'' + ", title='" + title + '\'' + ", url='" + url + '\'' + '}'; } public String getCtime() { return ctime; } public void setCtime(String ctime) { this.ctime = ctime; } public String getDescription() { return description; } public void setDescription(String description) { this.description = description; } public String getPicUrl() { return picUrl; } public void setPicUrl(String picUrl) { this.picUrl = picUrl; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; }}
ResultBeanpackage com.example.fragment;import java.util.List;/** * Created by e531 on 2017/10/8. */public class ResultBean { private String code; private String msg; private List<News> newslist; @Override public String toString() { return "ResultBean{" + "code='" + code + '\'' + ", msg='" + msg + '\'' + ", newslist=" + newslist + '}'; } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } public List<News> getNewslist() { return newslist; } public void setNewslist(List<News> newslist) { this.newslist = newslist; } public String getCode() { return code; } public void setCode(String code) { this.code = code; }}
布局
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.fragment.MainActivity"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="HttpClient请求" android:id="@+id/btn_client" android:layout_alignParentTop="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="HttpURLConnect请求" android:id="@+id/btn_url" android:layout_alignParentTop="true" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" /> <FrameLayout android:layout_width="match_parent" android:layout_below="@+id/btn_client" android:layout_height="match_parent" > <ListView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/lv" android:layout_alignParentLeft="true" android:layout_gravity="center" /> <ProgressBar style="?android:attr/progressBarStyleLarge" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/progressBar" android:layout_gravity="center" /> </FrameLayout></RelativeLayout>
item
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:layout_width="60dp" android:layout_height="60dp" android:layout_alignParentLeft="true" android:id="@+id/img" android:scaleType="fitXY"/> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/tv_title" android:layout_toRightOf="@id/img" android:padding="5dp"/> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/tv_date" android:layout_toRightOf="@+id/img" android:layout_below="@id/tv_title" android:padding="5dp"/></RelativeLayout>
阅读全文
0 0
- Http两种请求
- Http请求两种方式
- 发送HTTP请求的两种方式
- Android的http两种请求方式
- HTTP请求之两种方式
- Python3的两种HTTP请求实现
- http 请求 两种主要的请求方式
- C# wnform 请求http ( get , post 两种方式 ）
- 两种 HTTP 请求方法：GET 和 POST
- Fiddler2拦截http请求修改数据两种方法
- 两种 HTTP 请求方法：GET 和 POST
- android之Http两种post请求方式
- 两种 HTTP 请求方法：GET 和 POST
- 面试2-两种 HTTP 请求方法：GET 和 POST
- 两种HTTP请求方法：GET和POST
- Fiddler2拦截http请求修改数据两种方法
- 两种 HTTP 请求方法：GET 和 POST
- C# winform 请求http ( get , post 两种方式 ）
- map_set
- numpy的基础用法
- 栈帧——函数的调用过程
- retrofit详解
- 【GridFS】使用介绍
- Http两种请求
- Python常用函数与技巧总结（二）
- PAT乙级题1024.科学计数法
- WordPress安装与迁移
- 基于node的websocket学习笔记三:scoket.io基础与利用scoket.io构建聊天程序示例
- 第一部分 第五章 数组 1102-1149
- 冒泡排序and插入排序
- [haoi2014]遥感监测解题报告
- 交换两个整形数据的三种方法
