Java-简单的 发送http get/post请求 调用接口/方法

例子如下：

1.请求参数

srequestUrl 是你要发送的接口

参数用map 存起来 

sRet 是返回值 如果发送的接口有的话就写 

然后调用 NetUtils.requset请求 （接口，参数，get/post（选择一种发送方式））

String sRequestUrl ="http://weiyi/xxx/xxx/xxxx";
Map params = new HashMap();
params.put("wishing","恭喜你获得大学奖学金！");
params.put("act_name","XX大学");
params.put("remark","红包提现");
String sRet = NetUtils.request(sRequestUrl, params, "POST");

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Map;

public class NetUtils {
	public static final String DEF_CHATSET = "UTF-8";
	public static final int DEF_CONN_TIMEOUT = 30000;
	public static final int DEF_READ_TIMEOUT = 30000;
	public static String userAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36";

	public static String request(String strUrl, Map params, String method) throws Exception {
		HttpURLConnection conn = null;
		BufferedReader reader = null;
		String rs = null;

		try {
			StringBuffer sb = new StringBuffer();
			if (method == null || method.equals("GET")) {
				strUrl = strUrl + "?" + urlencode(params);
			}
			URL url = new URL(strUrl);
			conn = (HttpURLConnection) url.openConnection();
			if (method == null || method.equals("GET")) {
				conn.setRequestMethod("GET");
			} else {
				conn.setRequestMethod("POST");
				conn.setDoOutput(true);
			}
			conn.setRequestProperty("User-agent", userAgent);
			conn.setUseCaches(false);
			conn.setConnectTimeout(DEF_CONN_TIMEOUT);
			conn.setReadTimeout(DEF_READ_TIMEOUT);
			conn.setInstanceFollowRedirects(false);
			conn.connect();
			if (params != null && method.equals("POST")) {
				try {
					DataOutputStream out = new DataOutputStream(conn.getOutputStream());
					out.writeBytes(urlencode(params));
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
			InputStream is = conn.getInputStream();
			reader = new BufferedReader(new InputStreamReader(is, DEF_CHATSET));
			String strRead = null;
			while ((strRead = reader.readLine()) != null) {
				sb.append(strRead);
			}
			rs = sb.toString();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (reader != null) {
				reader.close();
			}
			if (conn != null) {
				conn.disconnect();
			}
		}
		return rs;
	}

	public static String requestUrl(String strUrl, Map params) throws Exception {
		HttpURLConnection conn = null;
		BufferedReader reader = null;
		String rs = null;

		try {
			StringBuffer sb = new StringBuffer();
			URL url = new URL(strUrl + "?" + urlencode(params));
			conn = (HttpURLConnection) url.openConnection();
			conn.setRequestMethod("GET");
			conn.setRequestProperty("User-agent", userAgent);
			conn.setUseCaches(false);
			conn.setConnectTimeout(DEF_CONN_TIMEOUT);
			conn.setReadTimeout(DEF_READ_TIMEOUT);
			conn.setInstanceFollowRedirects(false);
			conn.connect();
			InputStream is = conn.getInputStream();
			reader = new BufferedReader(new InputStreamReader(is, DEF_CHATSET));
			String strRead = null;
			while ((strRead = reader.readLine()) != null) {
				sb.append(strRead + "\r\n");
			}
			rs = sb.toString();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (reader != null) {
				reader.close();
			}
			if (conn != null) {
				conn.disconnect();
			}
		}
		return rs;
	}

	// 将map型转为请求参数型
	public static String urlencode(Map data) {
		StringBuilder sb = new StringBuilder();

		for (Map.Entry i : data.entrySet()) {
			try {
				sb.append(i.getKey()).append("=").append(URLEncoder.encode(i.getValue() + "", "UTF-8")).append("&");
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
		}

		return sb.toString();
	}
}