java 4种http请求,get,post方式
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import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.Socket;import java.net.URL;import java.net.URLConnection;import java.net.URLEncoder;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Map.Entry;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;/** * @Description:发送http请求帮助类 * @author:liuyc * @time:2016年5月17日 下午3:25:32 */public class HttpClientHelper { /** * @Description:使用HttpURLConnection发送post请求 * @author:liuyc * @time:2016年5月17日 下午3:26:07 */ public static String sendPost(String urlParam, Map<String, Object> params, String charset) { StringBuffer resultBuffer = null; // 构建请求参数 StringBuffer sbParams = new StringBuffer(); if (params != null && params.size() > 0) { for (Entry<String, Object> e : params.entrySet()) { sbParams.append(e.getKey()); sbParams.append("="); sbParams.append(e.getValue()); sbParams.append("&"); } } HttpURLConnection con = null; OutputStreamWriter osw = null; BufferedReader br = null; // 发送请求 try { URL url = new URL(urlParam); con = (HttpURLConnection) url.openConnection(); con.setRequestMethod("POST"); con.setDoOutput(true); con.setDoInput(true); con.setUseCaches(false); con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); if (sbParams != null && sbParams.length() > 0) { osw = new OutputStreamWriter(con.getOutputStream(), charset); osw.write(sbParams.substring(0, sbParams.length() - 1)); osw.flush(); } // 读取返回内容 resultBuffer = new StringBuffer(); int contentLength = Integer.parseInt(con.getHeaderField("Content-Length")); if (contentLength > 0) { br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset)); String temp; while ((temp = br.readLine()) != null) { resultBuffer.append(temp); } } } catch (Exception e) { throw new RuntimeException(e); } finally { if (osw != null) { try { osw.close(); } catch (IOException e) { osw = null; throw new RuntimeException(e); } finally { if (con != null) { con.disconnect(); con = null; } } } if (br != null) { try { br.close(); } catch (IOException e) { br = null; throw new RuntimeException(e); } finally { if (con != null) { con.disconnect(); con = null; } } } } return resultBuffer.toString(); } /** * @Description:使用URLConnection发送post * @author:liuyc * @time:2016年5月17日 下午3:26:52 */ public static String sendPost2(String urlParam, Map<String, Object> params, String charset) { StringBuffer resultBuffer = null; // 构建请求参数 StringBuffer sbParams = new StringBuffer(); if (params != null && params.size() > 0) { for (Entry<String, Object> e : params.entrySet()) { sbParams.append(e.getKey()); sbParams.append("="); sbParams.append(e.getValue()); sbParams.append("&"); } } URLConnection con = null; OutputStreamWriter osw = null; BufferedReader br = null; try { URL realUrl = new URL(urlParam); // 打开和URL之间的连接 con = realUrl.openConnection(); // 设置通用的请求属性 con.setRequestProperty("accept", "*/*"); con.setRequestProperty("connection", "Keep-Alive"); con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); con.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 con.setDoOutput(true); con.setDoInput(true); // 获取URLConnection对象对应的输出流 osw = new OutputStreamWriter(con.getOutputStream(), charset); if (sbParams != null && sbParams.length() > 0) { // 发送请求参数 osw.write(sbParams.substring(0, sbParams.length() - 1)); // flush输出流的缓冲 osw.flush(); } // 定义BufferedReader输入流来读取URL的响应 resultBuffer = new StringBuffer(); int contentLength = Integer.parseInt(con.getHeaderField("Content-Length")); if (contentLength > 0) { br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset)); String temp; while ((temp = br.readLine()) != null) { resultBuffer.append(temp); } } } catch (Exception e) { throw new RuntimeException(e); } finally { if (osw != null) { try { osw.close(); } catch (IOException e) { osw = null; throw new RuntimeException(e); } } if (br != null) { try { br.close(); } catch (IOException e) { br = null; throw new RuntimeException(e); } } } return resultBuffer.toString(); } /** * @Description:发送get请求保存下载文件 * @author:liuyc * @time:2016年5月17日 下午3:27:29 */ public static void sendGetAndSaveFile(String urlParam, Map<String, Object> params, String fileSavePath) { // 构建请求参数 StringBuffer sbParams = new StringBuffer(); if (params != null && params.size() > 0) { for (Entry<String, Object> entry : params.entrySet()) { sbParams.append(entry.getKey()); sbParams.append("="); sbParams.append(entry.getValue()); sbParams.append("&"); } } HttpURLConnection con = null; BufferedReader br = null; FileOutputStream os = null; try { URL url = null; if (sbParams != null && sbParams.length() > 0) { url = new URL(urlParam + "?" + sbParams.substring(0, sbParams.length() - 1)); } else { url = new URL(urlParam); } con = (HttpURLConnection) url.openConnection(); con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); con.connect(); InputStream is = con.getInputStream(); os = new FileOutputStream(fileSavePath); byte buf[] = new byte[1024]; int count = 0; while ((count = is.read(buf)) != -1) { os.write(buf, 0, count); } os.flush(); } catch (Exception e) { throw new RuntimeException(e); } finally { if (os != null) { try { os.close(); } catch (IOException e) { os = null; throw new RuntimeException(e); } finally { if (con != null) { con.disconnect(); con = null; } } } if (br != null) { try { br.close(); } catch (IOException e) { br = null; throw new RuntimeException(e); } finally { if (con != null) { con.disconnect(); con = null; } } } } } /** * @Description:使用HttpURLConnection发送get请求 * @author:liuyc * @time:2016年5月17日 下午3:27:29 */ public static String sendGet(String urlParam, Map<String, Object> params, String charset) { StringBuffer resultBuffer = null; // 构建请求参数 StringBuffer sbParams = new StringBuffer(); if (params != null && params.size() > 0) { for (Entry<String, Object> entry : params.entrySet()) { sbParams.append(entry.getKey()); sbParams.append("="); sbParams.append(entry.getValue()); sbParams.append("&"); } } HttpURLConnection con = null; BufferedReader br = null; try { URL url = null; if (sbParams != null && sbParams.length() > 0) { url = new URL(urlParam + "?" + sbParams.substring(0, sbParams.length() - 1)); } else { url = new URL(urlParam); } con = (HttpURLConnection) url.openConnection(); con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); con.connect(); resultBuffer = new StringBuffer(); br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset)); String temp; while ((temp = br.readLine()) != null) { resultBuffer.append(temp); } } catch (Exception e) { throw new RuntimeException(e); } finally { if (br != null) { try { br.close(); } catch (IOException e) { br = null; throw new RuntimeException(e); } finally { if (con != null) { con.disconnect(); con = null; } } } } return resultBuffer.toString(); } /** * @Description:使用URLConnection发送get请求 * @author:liuyc * @time:2016年5月17日 下午3:27:58 */ public static String sendGet2(String urlParam, Map<String, Object> params, String charset) { StringBuffer resultBuffer = null; // 构建请求参数 StringBuffer sbParams = new StringBuffer(); if (params != null && params.size() > 0) { for (Entry<String, Object> entry : params.entrySet()) { sbParams.append(entry.getKey()); sbParams.append("="); sbParams.append(entry.getValue()); sbParams.append("&"); } } BufferedReader br = null; try { URL url = null; if (sbParams != null && sbParams.length() > 0) { url = new URL(urlParam + "?" + sbParams.substring(0, sbParams.length() - 1)); } else { url = new URL(urlParam); } URLConnection con = url.openConnection(); // 设置请求属性 con.setRequestProperty("accept", "*/*"); con.setRequestProperty("connection", "Keep-Alive"); con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); con.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); // 建立连接 con.connect(); resultBuffer = new StringBuffer(); br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset)); String temp; while ((temp = br.readLine()) != null) { resultBuffer.append(temp); } } catch (Exception e) { throw new RuntimeException(e); } finally { if (br != null) { try { br.close(); } catch (IOException e) { br = null; throw new RuntimeException(e); } } } return resultBuffer.toString(); } /** * @Description:使用HttpClient发送post请求 * @author:liuyc * @time:2016年5月17日 下午3:28:23 */ public static String httpClientPost(String urlParam, Map<String, Object> params, String charset) { StringBuffer resultBuffer = null; HttpClient client = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(urlParam); // 构建请求参数 List<NameValuePair> list = new ArrayList<NameValuePair>(); Iterator<Entry<String, Object>> iterator = params.entrySet().iterator(); while (iterator.hasNext()) { Entry<String, Object> elem = iterator.next(); list.add(new BasicNameValuePair(elem.getKey(), String.valueOf(elem.getValue()))); } BufferedReader br = null; try { if (list.size() > 0) { UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, charset); httpPost.setEntity(entity); } HttpResponse response = client.execute(httpPost); // 读取服务器响应数据 resultBuffer = new StringBuffer(); br = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); String temp; while ((temp = br.readLine()) != null) { resultBuffer.append(temp); } } catch (Exception e) { throw new RuntimeException(e); } finally { if (br != null) { try { br.close(); } catch (IOException e) { br = null; throw new RuntimeException(e); } } } return resultBuffer.toString(); } /** * @Description:使用HttpClient发送get请求 * @author:liuyc * @time:2016年5月17日 下午3:28:56 */ public static String httpClientGet(String urlParam, Map<String, Object> params, String charset) { StringBuffer resultBuffer = null; HttpClient client = new DefaultHttpClient(); BufferedReader br = null; // 构建请求参数 StringBuffer sbParams = new StringBuffer(); if (params != null && params.size() > 0) { for (Entry<String, Object> entry : params.entrySet()) { sbParams.append(entry.getKey()); sbParams.append("="); try { sbParams.append(URLEncoder.encode(String.valueOf(entry.getValue()), charset)); } catch (UnsupportedEncodingException e) { throw new RuntimeException(e); } sbParams.append("&"); } } if (sbParams != null && sbParams.length() > 0) { urlParam = urlParam + "?" + sbParams.substring(0, sbParams.length() - 1); } HttpGet httpGet = new HttpGet(urlParam); try { HttpResponse response = client.execute(httpGet); // 读取服务器响应数据 br = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); String temp; resultBuffer = new StringBuffer(); while ((temp = br.readLine()) != null) { resultBuffer.append(temp); } } catch (Exception e) { throw new RuntimeException(e); } finally { if (br != null) { try { br.close(); } catch (IOException e) { br = null; throw new RuntimeException(e); } } } return resultBuffer.toString(); } /** * @Description:使用socket发送post请求 * @author:liuyc * @time:2016年5月18日 上午9:26:22 */ public static String sendSocketPost(String urlParam, Map<String, Object> params, String charset) { String result = ""; // 构建请求参数 StringBuffer sbParams = new StringBuffer(); if (params != null && params.size() > 0) { for (Entry<String, Object> entry : params.entrySet()) { sbParams.append(entry.getKey()); sbParams.append("="); sbParams.append(entry.getValue()); sbParams.append("&"); } } Socket socket = null; OutputStreamWriter osw = null; InputStream is = null; try { URL url = new URL(urlParam); String host = url.getHost(); int port = url.getPort(); if (-1 == port) { port = 80; } String path = url.getPath(); socket = new Socket(host, port); StringBuffer sb = new StringBuffer(); sb.append("POST " + path + " HTTP/1.1\r\n"); sb.append("Host: " + host + "\r\n"); sb.append("Connection: Keep-Alive\r\n"); sb.append("Content-Type: application/x-www-form-urlencoded; charset=utf-8 \r\n"); sb.append("Content-Length: ").append(sb.toString().getBytes().length).append("\r\n"); // 这里一个回车换行，表示消息头写完，不然服务器会继续等待 sb.append("\r\n"); if (sbParams != null && sbParams.length() > 0) { sb.append(sbParams.substring(0, sbParams.length() - 1)); } osw = new OutputStreamWriter(socket.getOutputStream()); osw.write(sb.toString()); osw.flush(); is = socket.getInputStream(); String line = null; // 服务器响应体数据长度 int contentLength = 0; // 读取http响应头部信息 do { line = readLine(is, 0, charset); if (line.startsWith("Content-Length")) { // 拿到响应体内容长度 contentLength = Integer.parseInt(line.split(":")[1].trim()); } // 如果遇到了一个单独的回车换行，则表示请求头结束 } while (!line.equals("\r\n")); // 读取出响应体数据（就是你要的数据） result = readLine(is, contentLength, charset); } catch (Exception e) { throw new RuntimeException(e); } finally { if (osw != null) { try { osw.close(); } catch (IOException e) { osw = null; throw new RuntimeException(e); } finally { if (socket != null) { try { socket.close(); } catch (IOException e) { socket = null; throw new RuntimeException(e); } } } } if (is != null) { try { is.close(); } catch (IOException e) { is = null; throw new RuntimeException(e); } finally { if (socket != null) { try { socket.close(); } catch (IOException e) { socket = null; throw new RuntimeException(e); } } } } } return result; } /** * @Description:使用socket发送get请求 * @author:liuyc * @time:2016年5月18日 上午9:27:18 */ public static String sendSocketGet(String urlParam, Map<String, Object> params, String charset) { String result = ""; // 构建请求参数 StringBuffer sbParams = new StringBuffer(); if (params != null && params.size() > 0) { for (Entry<String, Object> entry : params.entrySet()) { sbParams.append(entry.getKey()); sbParams.append("="); sbParams.append(entry.getValue()); sbParams.append("&"); } } Socket socket = null; OutputStreamWriter osw = null; InputStream is = null; try { URL url = new URL(urlParam); String host = url.getHost(); int port = url.getPort(); if (-1 == port) { port = 80; } String path = url.getPath(); socket = new Socket(host, port); StringBuffer sb = new StringBuffer(); sb.append("GET " + path + " HTTP/1.1\r\n"); sb.append("Host: " + host + "\r\n"); sb.append("Connection: Keep-Alive\r\n"); sb.append("Content-Type: application/x-www-form-urlencoded; charset=utf-8 \r\n"); sb.append("Content-Length: ").append(sb.toString().getBytes().length).append("\r\n"); // 这里一个回车换行，表示消息头写完，不然服务器会继续等待 sb.append("\r\n"); if (sbParams != null && sbParams.length() > 0) { sb.append(sbParams.substring(0, sbParams.length() - 1)); } osw = new OutputStreamWriter(socket.getOutputStream()); osw.write(sb.toString()); osw.flush(); is = socket.getInputStream(); String line = null; // 服务器响应体数据长度 int contentLength = 0; // 读取http响应头部信息 do { line = readLine(is, 0, charset); if (line.startsWith("Content-Length")) { // 拿到响应体内容长度 contentLength = Integer.parseInt(line.split(":")[1].trim()); } // 如果遇到了一个单独的回车换行，则表示请求头结束 } while (!line.equals("\r\n")); // 读取出响应体数据（就是你要的数据） result = readLine(is, contentLength, charset); } catch (Exception e) { throw new RuntimeException(e); } finally { if (osw != null) { try { osw.close(); } catch (IOException e) { osw = null; throw new RuntimeException(e); } finally { if (socket != null) { try { socket.close(); } catch (IOException e) { socket = null; throw new RuntimeException(e); } } } } if (is != null) { try { is.close(); } catch (IOException e) { is = null; throw new RuntimeException(e); } finally { if (socket != null) { try { socket.close(); } catch (IOException e) { socket = null; throw new RuntimeException(e); } } } } } return result; } /** * @Description:读取一行数据，contentLe内容长度为0时，读取响应头信息，不为0时读正文 * @time:2016年5月17日 下午6:11:07 */ private static String readLine(InputStream is, int contentLength, String charset) throws IOException { List<Byte> lineByte = new ArrayList<Byte>(); byte tempByte; int cumsum = 0; if (contentLength != 0) { do { tempByte = (byte) is.read(); lineByte.add(Byte.valueOf(tempByte)); cumsum++; } while (cumsum < contentLength);// cumsum等于contentLength表示已读完 } else { do { tempByte = (byte) is.read(); lineByte.add(Byte.valueOf(tempByte)); } while (tempByte != 10);// 换行符的ascii码值为10 } byte[] resutlBytes = new byte[lineByte.size()]; for (int i = 0; i < lineByte.size(); i++) { resutlBytes[i] = (lineByte.get(i)).byteValue(); } return new String(resutlBytes, charset); }}以上4种分别可发送get和post请求的方法，第1种：HttpURLConnection、第2种：URLConnection、第3种：HttpClient、第4种：Socket，朋友们要注意的是，使用第3种HttpClient时需要依赖于三个jar包，分别是：apache-httpcomponents-httpclient.jar、commons-logging-1.0.4.jar、httpcore-4.1.1.jar。好了就到这里吧，有问题记得留言哦
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