java中post和get请求

示例代码：

package com.shareboxes.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.junit.Ignore;
import org.junit.Test;

/**
* @ClassName: HttpRequest
* @Description: get，post请求
* @author Administrator
* @date 2015年10月19日
*
 */

public class HttpRequest {

    /**
    * @Title: sendGet
    * @Description: get请求
    * @param url
    * @param param
     */
    public static String sendGet(String url, Map<String, String> param) {
        BufferedReader bReader = null;
        StringBuffer sBuffer = new StringBuffer();
        String realUrl = url;

        try {
            
            if (param.size() > 0) {
                realUrl += "?";
                for (Entry<String, String> entry : param.entrySet()) {
                    realUrl += entry.getKey() + "=" + entry.getValue() + "&";
                }
                realUrl = realUrl.substring(0, realUrl.length() - 1);
            }

            URL urlString = new URL(realUrl);
            URLConnection urlConnection = urlString.openConnection();
            HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;
            httpURLConnection.setRequestMethod("GET");// 设置请求方法
            httpURLConnection.setConnectTimeout(30000);// 连接主机超时时间
            httpURLConnection.setReadTimeout(30000);// 读取数据超时时间
            httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");// 设置请求数据的格式
            httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
            httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");// 设置接收数据的编码

            // 判断连接是否异常
            if (httpURLConnection.getResponseCode() >= 300) {
                throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
            }
            
            System.out.println(httpURLConnection.getResponseCode());
            for(Entry<String, List<String>>entry:httpURLConnection.getHeaderFields().entrySet()){
                System.out.println(entry.getKey()+"--------->"+entry.getValue());
            }

            bReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream(), "utf-8"));
            String line = null;
            while ((line = bReader.readLine()) != null) {
                sBuffer.append(line);
            }
        } catch (Exception e) {
            System.out.println("get 请求发生错误!!!");
            e.printStackTrace();
        } finally {
            if (bReader != null) {
                try {
                    bReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return sBuffer.toString();
    }

    /**
    * @Title: sendPost
    * @Description: post请求
    * @param url
    * @param param
     */
    public static String sendPost(String url, Map<String, String> param) {
        BufferedReader bReader = null;
        OutputStreamWriter out = null;
        StringBuffer sBuffer = new StringBuffer();
        String parameterData ="";

        try {
            if (param.size() > 0) {
                for (Entry<String, String> entry : param.entrySet()) {
                    parameterData += entry.getKey() + "=" + entry.getValue() + "&";
                }
                parameterData = parameterData.substring(0, parameterData.length() - 1);
            }

            URL realUrl = new URL(url);
            HttpURLConnection httpURLConnection = (HttpURLConnection) realUrl.openConnection();

            httpURLConnection.setConnectTimeout(30000);
            httpURLConnection.setReadTimeout(30000);
            httpURLConnection.setRequestMethod("POST");

            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            httpURLConnection.setUseCaches(false);
            httpURLConnection.setInstanceFollowRedirects(true);

            httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");// 设置请求参数的格式
            httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
            httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");// 接收数据的编码
            
            if((parameterData.trim().length()>0) && (!parameterData.equals(""))){
                out = new OutputStreamWriter(httpURLConnection.getOutputStream(), "utf-8");
                out.write(parameterData);
                out.flush();
            }
            

            // 判断连接是否异常
            if (httpURLConnection.getResponseCode() >= 300) {
                throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
            }
            
            System.out.println(httpURLConnection.getResponseCode());
            for(Entry<String, List<String>>entry:httpURLConnection.getHeaderFields().entrySet()){
                System.out.println(entry.getKey()+"--------->"+entry.getValue());
            }
            
//            bReader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream(), "utf-8"));
//            String line = null;
//            while ((line = bReader.readLine()) != null) {
//                sBuffer.append(line);
//            }
            
            InputStream in=httpURLConnection.getInputStream();
            byte []data=new byte[httpURLConnection.getContentLength()];
            int offset=0;
            while(offset<in.available()){
                offset+=in.read(data, offset, in.available()-offset);
                System.out.println(offset);
            }
            sBuffer.append(new String(data,"utf-8"));
        } catch (Exception e) {
            System.out.println("post 请求失败！！！");
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (bReader != null) {
                    bReader.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return sBuffer.toString();
    }

    @Test
    @Ignore
    public void testGet() {
        Map<String, String> param = new HashMap<String, String>();
        param.put("tid", "1");
        System.out.println(sendGet("http://localhost:8080/shareboxes/record/getrecord/tid.do", param));
    }

    @Test
    public void testPost() {
        Map<String, String> param = new HashMap<String, String>();
        param.put("tid", "1");
        System.out.println(sendPost("http://localhost:8080/shareboxes/record/getrecord/tid.do", param));
    }

}