java中Post和get请求数据

package com.cents.util;


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

import com.alibaba.fastjson.JSONObject;



public class test {
//测试
	public static void main(String[] args) throws UnsupportedEncodingException {
		// 发送 Post 请求 
		String s = sendPost("http://xxwpnapi.51chavip.cn/asyn/getorder/", "token=6671723079666c776a73623767637a7a&phone=17843243234&source=10");
		System.out.println(s);
		
		
		
		String string = new String("\u674e**".getBytes(),"utf-8");
		
		System.out.println(string);
     
		//发送 POST 请求（注意发送的数据格式，如果数据格式发送错误会返回400错误）
		/*****这里有个大坑啊，如果参数怎么都接收不到就看看那个传的参数格式↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓******/
		//String sr = sendPost("https://a1.easemob.com/1108190822148388/manhaotestone/token", "key=123&v=456");
		//System.out.println(sr);
	}

	public static String sendGet(String url, String param) {
		String result = "";
		BufferedReader in = null;
		try {
			String 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)");
			
			
			connection.setRequestProperty("Charsert", "UTF-8"); //设置请求编码
			// 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()));
			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;
	}

	/**
	 * 向指定 URL 发送POST方法的请求
	 * 
	 * @param url   发送请求的 URL
	 * @param string 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 string) {
	  PrintWriter out = null;
      BufferedReader in = null;
      String result = "";
      try {
          URL realUrl = new URL(url);
          // 打开和URL之间的连接
          URLConnection conn = realUrl.openConnection();
          // 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)");
          conn.setRequestProperty("Accept-Charset", "utf-8");
          conn.setRequestProperty("contentType", "utf-8");
          
        //  conn.setRequestProperty("contentType", "unicode");

          // 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(string);
          // flush输出流的缓冲
          out.flush();
          // 定义BufferedReader输入流来读取URL的响应
          in = new BufferedReader(
                  new InputStreamReader(conn.getInputStream(),"utf-8"));
          String line;
          while ((line = in.readLine()) != null) {
              result += line;
          }
      } 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 result;
  }
}