[Socket]利用Jatarka下HttpClient發送(Get && Post)請求

利用Jakarta的org.apache.commons下的HttpClient發送GET和POST請求，這是我自己寫的一個工具類，記下來留着以後用，另附期幫助API(org.apache.commons.client.httpclient)：

HttpClient APIs

1、首先，我們需要一個參數類，用類封裝發送Http請求時的參數集合，該類就是一個請求參數的鍵值對，代碼如下：

package com.mars.model;

import java.io.Serializable;

public class Parameter implements Serializable, Comparable<Parameter> {

	private static final long serialVersionUID = 2721340807561333705L;

	private String name;
	private String value;

	public Parameter() {
		super();
	}

	public Parameter(String name, String value) {
		super();
		this.name = name;
		this.value = value;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getValue() {
		return value;
	}

	public void setValue(String value) {
		this.value = value;
	}

	@Override
	public boolean equals(Object obj) {
		//對象不爲空
		if (obj == null) {
			return false;
		}
		//hashCode相等
		if (this == obj) {
			return true;
		}

		if (obj instanceof Parameter) {
			Parameter param = (Parameter) obj;
			return this.getName().equals(param.getName())
					&& this.getValue().equals(param.getValue());
		}

		return false;
	}

	@Override
	public String toString() {
		// TODO Auto-generated method stub
		return super.toString();
	}

	@Override
	public int compareTo(Parameter arg0) {
		// TODO Auto-generated method stub
		return 0;
	}

}

2、然後我們新建一個HttpUtils類，發送Http請求分爲同步和異步兩種方式，這是我只是用的同步方式，異步我暫時不太熟悉，代碼如下：

package com.mars.util;

import java.io.InputStream;
import java.util.List;

import org.apache.commons.httpclient.HttpClient;
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;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.mars.model.Parameter;

public class SyncHttp {

	private static final Log LOG = LogFactory.getLog(SyncHttp.class);
	private static final int CONNECTION_TIME = 1000 * 5;

	/**
	 * 
	 * @param url
	 * @param params
	 * @return
	 */
	public String httpGet(String url, String params) {
		// 創建HttpClient
		// 創建HttpMethod
		// 設置超時
		// 執行HttpMethod
		// 判斷返回的狀態碼
		// 成功，則獲取HttpMethod的InputStream
		String response = "";
		if (!params.equals("") && params != null) {
			url = url + "?" + params;
		}
		HttpClient client = new HttpClient();
		GetMethod getMethod = new GetMethod(url);
		getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT,
				CONNECTION_TIME);
		try {
			int statusCode = client.executeMethod(getMethod);
			if (statusCode == HttpStatus.SC_OK) {
				InputStream in = getMethod.getResponseBodyAsStream();
				response = getData(in);
			} else {
				LOG.debug("Get Method StatusCode:" + statusCode);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			getMethod.releaseConnection();
			client = null;
		}
		return response;
	}

	public String httpPost(String url, List<Parameter> params) throws Exception {
		String response = "";
		HttpClient client = new HttpClient();
		PostMethod postMethod = new PostMethod();
		postMethod.addParameter("Connection", "Keep-Alive");
		postMethod.addParameter("Charset", "UTF-8");
		postMethod.addParameter("Content-Type",
				"application/x-www-form-urlencoded");
		postMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT,
				CONNECTION_TIME);
		if (!params.equals("") && params != null) {
			postMethod.setRequestBody(buildNameValuePair(params));
		}
		int statusCode = client.executeMethod(postMethod);
		if (statusCode == HttpStatus.SC_OK) {
			InputStream in = postMethod.getResponseBodyAsStream();
			response = this.getData(in);
		} else {
			LOG.debug("Post Method StatusCode:" + statusCode);
		}
		postMethod.releaseConnection();
		client = null;
		return response;
	}

	/**
	 * 封裝HttpPost的Name-Value參數對
	 * 
	 * @param list
	 * @return
	 */
	private NameValuePair[] buildNameValuePair(List<Parameter> list) {
		int length = list.size();
		NameValuePair[] pais = new NameValuePair[length];
		for (int i = 0; i < length; i++) {
			Parameter param = list.get(i);
			pais[i] = new NameValuePair(param.getName(), param.getValue());
		}
		return pais;
	}

	/**
	 * 
	 * @param in
	 * @return
	 * @throws Exception
	 */
	private String getData(InputStream in) throws Exception {
		StringBuffer sb = new StringBuffer();
		int len = -1;
		byte[] bytes = new byte[1024];

		while ((len = in.read(bytes)) != -1) {
			sb.append(new String(bytes));
		}
		String data = sb.toString();
		return data;
	}
}

OK，以上兩個類就完成了，此文是我自己備份的代碼，建議大家也做一個自己的代碼庫，因爲我發現這樣的效果非常不錯，對今後的工作有很大的幫助。

轉載請標明出處，[email protected]