HttpClient 使用

Apache 的HttpClient 提供很多工具让开发者使用，其中常用的一种是调用http的请求，下面代码就是模拟了http的post和get请求。

package cn.tang.test.demo.httpclient;

import java.io.IOException;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;

public class TestInvoke {
	private static final String host ="10.1.1.225";
//	private static final String host ="localhost";
	public static void main(String[] args) {
		try {
			get();
			post();
			get2();
			
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	public static void post() {
		String url = "http://"+host+":8080/method/invoke";
		PostMethod method = new PostMethod(url);

		NameValuePair[] data = {
				new NameValuePair("key", "39d7e330-d271-4fe8-904a-aaf872962431"),
				new NameValuePair("invokeMethod", "messageReceive"),
				new NameValuePair("jsonData", "messageReceive") };
		method.setRequestBody(data);

		execute(method);
	}
	
	public static void get2() {
		String url = "http://"+host+":8080/method/invoke?key=39d7e330-d271-4fe8-904a-aaf872962431&invokeMethod=messageReceive&jsonData=data";
		GetMethod method = new GetMethod(url);
		execute(method);
	}

	public static void get() {
		String url = "http://"+host+":8080/method/list";
		GetMethod method = new GetMethod(url);

		method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
				new DefaultHttpMethodRetryHandler(3, false));

		execute(method);
	}

	private static void execute(HttpMethod method) {
		try {
			HttpClient client = new HttpClient();
			int statusCode = client.executeMethod(method);

			if (statusCode != HttpStatus.SC_OK) {
				System.err.println("Method failed: " + method.getStatusLine());
			}

			byte[] responseBody = method.getResponseBody();
			System.out.println(new String(responseBody));

		} catch (HttpException e) {
			System.err.println("Fatal protocol violation: " + e.getMessage());
			e.printStackTrace();
		} catch (IOException e) {
			System.err.println("Fatal transport error: " + e.getMessage());
			e.printStackTrace();
		} finally {
			// Release the connection.
			method.releaseConnection();
		}
	}

}

代码很简单，就不加注释和解释了。