http get和post 接口方式

package net.joystart.common.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;

import com.google.gson.Gson;

public class HttpRequestUtil {
	/**
	 * 向指定URL发送GET方法的请求
	 * 
	 * @param url
	 *            发送请求的URL
	 * @param param
	 *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	 * @return URL 所代表远程资源的响应结果
	 */
	public static String sendGet(String url, String param) {
		String result = "";
		StringBuilder jsonStr = new StringBuilder();
		BufferedReader in = null;
		String urlNameString = "";
		try {
			urlNameString = url + param;
			URL realUrl = new URL(urlNameString);
			// 打开和URL之间的连接
			URLConnection connection = realUrl.openConnection();
			// 设置通用的请求属性
			connection.setRequestProperty("accept", "*/*");
			connection.setRequestProperty("connection", "Keep-Alive");
			connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 建立实际的连接
			connection.connect();
			// 获取所有响应头字段
			Map> map = connection.getHeaderFields();
			// 遍历所有的响应头字段
			// for (String key : map.keySet()) {
			// System.out.println(key + "--->" + map.get(key));
			// }

			InputStreamReader reader = new InputStreamReader(connection.getInputStream(), ConstantUtil.UTF_CODE);
			char[] buff = new char[1024];
			int length = 0;
			while ((length = reader.read(buff)) != -1) {
				result = new String(buff, 0, length);
				jsonStr.append(result);
			}

			Gson gson = new Gson();
			Map temp = gson.fromJson("", Map.class);

		} catch (Exception e) {
			System.out.println("请求地址:url:" + urlNameString);
			System.out.println("发送GET请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输入流
		finally {
			try {
				if (in != null) {
					in.close();
				}
			} catch (Exception e2) {
				e2.printStackTrace();
			}
		}
		return jsonStr.toString();
	}

	/**
	 * 向指定 URL 发送POST方法的请求
	 * 
	 * @param url
	 *            发送请求的 URL
	 * @param param
	 *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	 * @return 所代表远程资源的响应结果
	 */
	public static String sendPost(String url, String param) {
		PrintWriter out = null;
		BufferedReader in = null;
		URLConnection conn = null;
		StringBuilder jsonStr = new StringBuilder();
		try {
			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			conn = realUrl.openConnection();
			conn.setConnectTimeout(20000);
			// 设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 发送POST请求必须设置如下两行
			conn.setDoOutput(true);
			conn.setDoInput(true);
			// 获取URLConnection对象对应的输出流
			out = new PrintWriter(conn.getOutputStream());
			// 发送请求参数
			out.print(param);
			// flush输出流的缓冲
			out.flush();
			// 定义BufferedReader输入流来读取URL的响应

			InputStreamReader reader = new InputStreamReader(conn.getInputStream(), ConstantUtil.UTF_CODE);
			char[] buff = new char[1024];
			int length = 0;
			while ((length = reader.read(buff)) != -1) {
				String result = new String(buff, 0, length);
				jsonStr.append(result);
			}
		} catch (Exception e) {
			System.out.println("发送 POST 请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输出流、输入流
		finally {
			try {
				if (out != null) {
					out.close();
				}
				if (in != null) {
					in.close();
				}
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return jsonStr.toString();
	}

	/**
	 * 向指定 URL 发送POST方法的请求
	 * 
	 * @param url
	 *            发送请求的 URL
	 * @param param
	 *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	 * @return 所代表远程资源的响应结果
	 */
	public static String sendPost(String url, String param, Map header) {
		PrintWriter out = null;
		BufferedReader in = null;
		URLConnection conn = null;
		StringBuilder jsonStr = new StringBuilder();
		try {
			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			conn = realUrl.openConnection();
			conn.setConnectTimeout(20000);
			// 设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 添加header信息
			for (Map.Entry entry : header.entrySet()) {
				conn.setRequestProperty(entry.getKey(), entry.getValue());
			}

			// 发送POST请求必须设置如下两行
			conn.setDoOutput(true);
			conn.setDoInput(true);
			// 获取URLConnection对象对应的输出流
			out = new PrintWriter(conn.getOutputStream());
			// 发送请求参数
			out.print(param);
			// flush输出流的缓冲
			out.flush();
			// 定义BufferedReader输入流来读取URL的响应

			InputStreamReader reader = new InputStreamReader(conn.getInputStream(), ConstantUtil.UTF_CODE);
			char[] buff = new char[1024];
			int length = 0;
			while ((length = reader.read(buff)) != -1) {
				String result = new String(buff, 0, length);
				jsonStr.append(result);
			}
		} catch (Exception e) {
			System.out.println("发送 POST 请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输出流、输入流
		finally {
			try {
				if (out != null) {
					out.close();
				}
				if (in != null) {
					in.close();
				}
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return jsonStr.toString();
	}

	/*
	 * 包的方式
	 * psot传参方式
	 * E代驾专用接口
	 * add cjl
	 */
	public static String doPostJson(String url, String param) {
		String responseBody = "";
		HttpPost httppost = new HttpPost(url);
		StringEntity entities = new StringEntity(param, "UTF-8");
		entities.setContentEncoding("UTF-8");
		entities.setContentType("application/x-www-form-urlencoded");
		httppost.setEntity(entities);
		ResponseHandler responseHandler = new ResponseHandler() {

			public String handleResponse(final HttpResponse response) throws ClientProtocolException, IOException {
				int status = response.getStatusLine().getStatusCode();
				if (status >= 200 && status < 300) {
					HttpEntity entity = response.getEntity();
					return entity != null ? EntityUtils.toString(entity) : null;
				} else {
					throw new ClientProtocolException("Unexpected response status: " + status);
				}
			}
		};
		try {
			responseBody = new DefaultHttpClient().execute(httppost, responseHandler);
		} catch (SocketTimeoutException e) {
			e.printStackTrace();
			responseBody = "timeout";
			return responseBody;
		} catch (ClientProtocolException e) {
			e.printStackTrace();
			return responseBody;
		} catch (IOException e) {
			e.printStackTrace();
			return responseBody;
		}
		return responseBody;
	}

	/*
	 * get传参方式
	 * E代驾专用接口
	 * add cjl
	 */
	public static String doGetJson(String url, String param) {
		String result = "";
		BufferedReader in = null;
		try {
			String urlNameString = url + "?" + param;
			URL realUrl = new URL(urlNameString);
			URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream(),ConstantUtil.UTF_CODE));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
	}


}

　　

转载于:https://www.cnblogs.com/cuijinlong/p/7456645.html