网络请求之HttpClient_169.254.172.203-优快云博客

本文链接：https://blog.youkuaiyun.com/hello__words/article/details/50709193

本文介绍了一种使用Java中的HttpClient库来发起POST请求的方法。通过示例代码详细展示了如何配置HttpClient、构造POST请求、设置请求参数及处理服务器响应的过程。

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package com.bwie.day_06_httpclient;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;

public class MainActivity extends Activity {

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

  new Thread() {

   public void run() {
    get_infoPOST();
   };

  }.start();


}

private void get_infoPOST() {
//  String uri="http://www.baidu.com";
  //登录
//  String uri="http://169.254.172.203:8080/web/servlet/LoginServlet";
  //聚合
    String uri= "http://apis.juhe.cn/goodbook/catalog?";

  //json
  //String uri="http://169.254.172.203:8080/index.json";


  //得到HttpClient对象
  HttpClient httpClient =new DefaultHttpClient();
  //通过Post方式访问,并制定接口地址,传的参数就是接口地址
  HttpPost httpPost =new HttpPost(uri);
//  HttpGet httpGet =new HttpGet(uri);

  try {
   //发送请求,并且得到响应数据
//   HttpResponse response = httpClient.execute(httpPost);

   //该list集合是携带客户端发给服务器的参数
   List<NameValuePair> list =new ArrayList<NameValuePair>();
   //通过键值对形式,传递服务器需要的参数
   list.add(new BasicNameValuePair("key", "cca134699ab46a8322a322c8c011449a"));
//   list.add(new BasicNameValuePair("pass", "abc"));
    //得到实体对象,并指定需要携带的参数和编码集
   UrlEncodedFormEntity entity =new UrlEncodedFormEntity(list);
   //将实体设置给httpPost对象,用于传递给服务
   httpPost.setEntity(entity);
   //执行要访问的网络请求(联网了)
   HttpResponse response = httpClient.execute(httpPost);
   //得到状态行
   StatusLine statusLine = response.getStatusLine();
   //通过状态行,得到状态码
   int statusCode = statusLine.getStatusCode();

   if(statusCode==200){

    //得到服务器返回的实体,这个实体包含着需要的数据(json,xml)
    HttpEntity entity_ = response.getEntity();
    //将实体转化成String类型
    String string = EntityUtils.toString(entity_);

    Log.i("http_", string);

   }else{

        Toast.makeText(MainActivity.this, " 服务器错误 ", 0).show();
   }

  } catch (ClientProtocolException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
}
}