使用Http访问网络(使用Apache HttpClient)

使用Apache HttpClient访问网络

package com.szy.news.service;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
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.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.json.JSONObject;

import com.szy.news.model.Parameter;

/**
*以同步方式发送Http请求
*/
public class SyncHttp
{

/**
* 通过GET方式发送请求
* @param url URL地址
* @param params 参数
* @return
* @throws Exception
*/
public String httpGet(String url, String params) throws Exception
{
String response = null; //返回信息
//拼接请求URL
if (null!=params&&!params.equals(""))
{
url += "?" + params;
}

int timeoutConnection = 3000;
int timeoutSocket = 5000;
HttpParams httpParameters = new BasicHttpParams();
// Set the timeout in milliseconds until a connection is established.
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
// in milliseconds which is the timeout for waiting for data.
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);

// 构造HttpClient的实例
//  HttpClient httpClient = new DefaultHttpClient();
HttpClient httpClient = new DefaultHttpClient(httpParameters);
// 创建GET方法的实例
HttpGet httpGet = new HttpGet(url);
try
{
HttpResponse httpResponse = httpClient.execute(httpGet);
int statusCode = httpResponse.getStatusLine().getStatusCode();
if (statusCode == HttpStatus.SC_OK) //SC_OK = 200
{
// 获得返回结果
response = EntityUtils.toString(httpResponse.getEntity());
JSONObject jsonObject = new JSONObject(response);
}
else
{
response = "返回码："+statusCode;
}
} catch (Exception e)
{
throw new Exception(e);
}
return response;
}

/**
* 通过POST方式发送请求
* @param url URL地址
* @param params 参数
* @return
* @throws Exception
*/
public String httpPost(String url, List<Parameter> params) throws Exception
{
String response = null;

int timeoutConnection = 3000;
int timeoutSocket = 5000;
// Set the timeout in milliseconds until a connection is established.
HttpParams httpParameters = new BasicHttpParams();
// Set the default socket timeout (SO_TIMEOUT).in milliseconds which is the timeout for waiting for data.
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);

// 构造HttpClient的实例
//HttpClient httpClient = new DefaultHttpClient();
HttpClient httpClient = new DefaultHttpClient(httpParameters);

HttpPost httpPost = new HttpPost(url);
if (params.size()>=0)
{
//设置httpPost请求参数
httpPost.setEntity(new UrlEncodedFormEntity(buildNameValuePair(params),HTTP.UTF_8));
}
//使用execute方法发送HTTP Post请求，并返回HttpResponse对象
HttpResponse httpResponse = httpClient.execute(httpPost);
int statusCode = httpResponse.getStatusLine().getStatusCode();
if(statusCode==HttpStatus.SC_OK)
{
//获得返回结果
response = EntityUtils.toString(httpResponse.getEntity());
}
else
{
response = "返回码："+statusCode;
}
return response;
}

/**
* 把Parameter类型集合转换成NameValuePair类型集合
* @param params 参数集合
* @return
*/
private List<BasicNameValuePair> buildNameValuePair(List<Parameter> params)
{
List<BasicNameValuePair> result = new ArrayList<BasicNameValuePair>();
for (Parameter param : params)
{
BasicNameValuePair pair = new BasicNameValuePair(param.getName(), param.getValue());
result.add(pair);
}
return result;
}
}

HttpGet调用方法：

SyncHttp syncHttp = new SyncHttp();

String urlStr = "http://10.0.2.2:8080/web/getComments";

String params = "cid="+ pNewsid + "&startnid=0&count=10";

String retStr = syncHttp.httpGet(urlStr, params); //以Get方式请求，并获得返回结果

HttpPost调用方法：

String url = "http://10.0.2.2:8080/web/postComment";

List<Parameter> params = new ArrayList<Parameter>();

params.add(new Parameter("nid", mCategoryNids.get(mCurrentPosition)+""));

params.add(new Parameter("region", "安徽"));

params.add(new Parameter("content", mNewsReplyEditText.getText().toString()));

SyncHttp http = new SyncHttp();

String retStr = http.httpPost(url, params);