HttpClient模拟get，post请求并发送请求参数（json等）

import java.io.IOException;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

/**
 * 
 */
public class HttpClientUtil {

	public static void main(String arg[]) throws Exception {
		String url = "test.com";
		JSONObject params = new JSONObject();
		params.put("SRC_STM_CODE", "wsf");
		params.put("TENANT_ID", "123");
		params.put("NM", "张三");
		params.put("BRTH_DT", "1983-01-20");
		params.put("GND_CODE", "1");
		JSONArray params2 = new JSONArray();
		JSONObject param3 = new JSONObject();
		param3.put("DOC_TP_CODE", "10100");
		param3.put("DOC_NBR", "100200198301202210");
		param3.put("DOC_CUST_NM", "test");
		params2.add(param3);
		params.put("DOCS", params2);
		String ret = doPost(url, params).toString();
		System.out.println(ret);
	}

	/**
	 httpClient的get请求方式2
	 * @return
	 * @throws Exception
	 */
	public static String doGet(String url, String charset)
			throws Exception {
		/*
		 * 使用 GetMethod 来访问一个 URL 对应的网页,实现步骤: 1:生成一个 HttpClinet 对象并设置相应的参数。
		 * 2:生成一个 GetMethod 对象并设置响应的参数。 3:用 HttpClinet 生成的对象来执行 GetMethod 生成的Get
		 * 方法。 4:处理响应状态码。 5:若响应正常，处理 HTTP 响应内容。 6:释放连接。
		 */
		/* 1 生成 HttpClinet 对象并设置参数 */
		HttpClient httpClient = new HttpClient();
		// 设置 Http 连接超时为5秒
		httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(5000);
		/* 2 生成 GetMethod 对象并设置参数 */
		GetMethod getMethod = new GetMethod(url);
		// 设置 get 请求超时为 5 秒
		getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 5000);
		// 设置请求重试处理，用的是默认的重试处理：请求三次
		getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,	new DefaultHttpMethodRetryHandler());
		String response = "";
		/* 3 执行 HTTP GET 请求 */
		try {
			int statusCode = httpClient.executeMethod(getMethod);
			/* 4 判断访问的状态码 */
			if (statusCode != HttpStatus.SC_OK) {
				System.err.println("请求出错: "+ getMethod.getStatusLine());
			}
			/* 5 处理 HTTP 响应内容 */
			// HTTP响应头部信息，这里简单打印
			Header[] headers = getMethod.getResponseHeaders();
			for (Header h : headers)
				System.out.println(h.getName() + "------------ " + h.getValue());
			// 读取 HTTP 响应内容，这里简单打印网页内容
			byte[] responseBody = getMethod.getResponseBody();// 读取为字节数组
			response = new String(responseBody, charset);
			System.out.println("----------response:" + response);
			// 读取为 InputStream，在网页内容数据量大时候推荐使用
			// InputStream response = getMethod.getResponseBodyAsStream();
		} catch (HttpException e) {
			// 发生致命的异常，可能是协议不对或者返回的内容有问题
			System.out.println("请检查输入的URL!");
			e.printStackTrace();
		} catch (IOException e) {
			// 发生网络异常
			System.out.println("发生网络异常!");
			e.printStackTrace();
		} finally {
			/* 6 .释放连接 */
			getMethod.releaseConnection();
		}
		return response;
	}

	/**
	 * post请求
	 * @param url
	 * @param json
	 * @return
	 */
	
	public static JSONObject doPost(String url,JSONObject json){
		DefaultHttpClient client = new DefaultHttpClient();
		HttpPost post = new HttpPost(url);
		JSONObject response = null;
		try {
			StringEntity s = new StringEntity(json.toString());
			s.setContentEncoding("UTF-8");
			s.setContentType("application/json");//发送json数据需要设置contentType
			post.setEntity(s);
			HttpResponse res = client.execute(post);
			if(res.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
				HttpEntity entity = res.getEntity();
				String result = EntityUtils.toString(res.getEntity());// 返回json格式：
				response = JSONObject.fromObject(result);
			}
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
		return response;
	}


}