HttpClient 是Apache下的子项目, 用来提供高效, 最新的,功能丰富的支持HTTP协议的客户端编程工具包, 并且支持HTTP协议

下面代码主要提供了HttpClient在实际项目中的应用:

package test;import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
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.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;import java.io.IOException;
import java.util.ArrayList;
import java.util.List;public class HttpClientTest {public static void main(String[] args) throws Exception {
//        testGet("http://localhost:8080/platform/login");testPost("http://localhost:8080/platform/login");}public static void testGet(String url) {//创建一个默认的HttpClientHttpClient httpClient = new DefaultHttpClient();try {//以get方式请求网页HttpGet getMethod = new HttpGet(url);//打印请求地址System.out.println("executing request " + getMethod.getURI());//创建响应处理服务器响应内容ResponseHandler<String> responseHandler = new BasicResponseHandler();//执行请求并获取结果String responseBody = httpClient.execute(getMethod, responseHandler);System.out.println("--------------------------------");System.out.println(responseBody);System.out.println("--------------------------------");} catch (IOException e) {throw new RuntimeException("connection refuse error!");}finally {//当不需要HttpClient实例时, 关闭连接管理器以确保释放系统资源httpClient.getConnectionManager().shutdown();}}public static void testPost(String url) {//创建一个默认的HttpClientHttpClient httpClient = new DefaultHttpClient();try {//以post方式请求网页HttpPost postMethod = new HttpPost(url);//添加HTTP POST参数List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>();nameValuePairList.add(new BasicNameValuePair("username", "admin"));nameValuePairList.add(new BasicNameValuePair("password", "admin"));//将POST参数以UTF-8编码并包装成表单实体对象postMethod.setEntity(new UrlEncodedFormEntity(nameValuePairList, "UTF-8"));//打印请求地址System.out.println("executing request " + postMethod.getRequestLine().getUri());//创建响应处理服务器响应内容ResponseHandler<String> responseHandler = new BasicResponseHandler();//执行请求并获取结果String responseBody = httpClient.execute(postMethod, responseHandler);System.out.println("--------------------------------------");System.out.println(responseBody);System.out.println("--------------------------------------");} catch (Exception e) {e.printStackTrace();}finally {//当不需要HttpClient实例时, 关闭连接管理器以确保释放系统资源httpClient.getConnectionManager().shutdown();}}
}