基础教程 Android Http请求-安卓笔记

Android Http请求

2022-05-20 18:30:16

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比较简单直接贴代码了。 package jftt.test; import java.io.IOException; import java.util.List; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.NameValuePair; import org.apache.http.client.ClientProt…

比较简单直接贴代码了。

package jftt.test;
import java.io.IOException;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
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.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import android.util.Log;
public class HttpRequest {
/**
*Post请求
*/
public void doPost(String url , List<NameValuePair> nameValuePairs){
//新建HttpClient对象
HttpClient httpclient = new DefaultHttpClient();
//创建POST连接
HttpPost httppost = new HttpPost(url);
try {
// //使用PSOT方式，必须用NameValuePair数组传递参数
// List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
// nameValuePairs.add(new BasicNameValuePair("id", "12345"));
// nameValuePairs.add(new BasicNameValuePair("stringdata","hps is Cool!"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
*Get请求
*/
public void doGet(String url){
HttpParams httpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParams,30000);
HttpConnectionParams.setSoTimeout(httpParams, 30000);
HttpClient httpClient = new DefaultHttpClient(httpParams);
// GET
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse response = httpClient.execute(httpGet);
if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK){
Log.i("GET", "Bad Request!");
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

需要主要的是:
1.    使用POST方式时，传递参数必须使用NameValuePair数组
2.    使用GET方式时，通过URL传递参数，注意写法
3.      通过setEntity方法来发送HTTP请求
4.      通过DefaultHttpClient 的 execute方法来获取HttpResponse
5. 通过getEntity()从Response中获取内容

String content = EntityUtils.toString(response.getEntity());

特别说明：
对于WCF的json服务，请求时如下：

/**
*Post请求
* @throws IOException
* @throws ClientProtocolException
*/
public static String doPost(String url , List<NameValuePair> nameValuePairs) throws ClientProtocolException, IOException{
String result = null;
//新建HttpClient对象
HttpClient httpclient = new DefaultHttpClient();
//创建POST连接
HttpPost httppost = new HttpPost(url);
httppost.setHeader("content-type", "application/json");
try {
if(nameValuePairs != null) {
StringEntity entity = new StringEntity("这里是JSON数据,如{"id":"12","name":"xiaoming"}", "utf-8");
entity.setContentType("application/json");
entity.setContentEncoding("utf-8");
httppost.setEntity(entity);
}
// if(nameValuePairs != null) {
// httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs, HTTP.UTF_8));
// }
HttpResponse response = httpclient.execute(httppost);
if (response.getStatusLine().getStatusCode() != 404)
{
result = EntityUtils.toString(response.getEntity());
Logger.d(TAG, "Response: " + result);
}
} finally {
}
return result;
}

其实就相当于传数据流的方式。

原文链接：http://blog.csdn.net/feng88724/article/details/6170021

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