Apache HttpComponents Client 4.0快速入门/升级-2.POST方法访问网页（转）
Http POST方法得到www.g.cn的源码：import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.ParseException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
public class PostSample {
public static void main(String[] args) throws ParseException, IOException {
String url = "http://www.g.cn/";
System.out.println(url);
System.out.println("Visit google using Apache commons-httpclient 3.1：");
List<NameValuePair> data3 = new ArrayList<NameValuePair>();
data3.add(new NameValuePair("username", "testuser"));
data3.add(new NameValuePair("password", "testpassword"));
System.out.println(post3(url, data3));
System.out.println("Visit google using Apache HttpComponents Client 4.0：");
List<BasicNameValuePair> data4 = new ArrayList<BasicNameValuePair>();
data4.add(new BasicNameValuePair("username", "testuser"));
data4.add(new BasicNameValuePair("password", "testpassword"));
System.out.println(post4(url, data4));
}
/** 使用Apache commons-httpclient 3.1，POST方法访问网页 */
public static String post3(String url, List<NameValuePair> data) throws IOException {
org.apache.commons.httpclient.HttpClient httpClient = new org.apache.commons.httpclient.HttpClient();
PostMethod postMethod = new PostMethod(url);
postMethod.setRequestBody(data.toArray(new NameValuePair));
try {
System.out.println("<< Response: " + httpClient.executeMethod(postMethod));
return postMethod.getResponseBodyAsString();
} finally {
postMethod.releaseConnection();
}
}
/** 使用Apache HttpComponents Client 4.0，POST方法访问网页 */
private static String post4(String url, List<? extends org.apache.http.NameValuePair> data)
throws ParseException, IOException {
org.apache.http.client.HttpClient client = new DefaultHttpClient();
HttpPost httpost = new HttpPost(url);
httpost.setEntity(new UrlEncodedFormEntity(data, HTTP.UTF_8));
try {
HttpResponse response = client.execute(httpost);
HttpEntity entity = response.getEntity();
System.out.println("<< Response: " + response.getStatusLine());
if (entity != null) {
return EntityUtils.toString(entity);
}
return null;
} finally {
client.getConnectionManager().shutdown();
}
}
}
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/inkfish/archive/2009/11/02/4757754.aspx
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