java中发送http请求的方法
package org.jeecgframework.test.demo;
import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.ConnectException;
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 java.util.Set;
import java.util.SortedMap;
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;
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();
}
//请求xml组装
public static String getRequestXml(SortedMap<String,Object> parameters){
StringBuffer sb = new StringBuffer();
sb.append("<xml>");
Set es = parameters.entrySet();
Iterator it = es.iterator();
while(it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
String key = (String)entry.getKey();
String value = (String)entry.getValue();
if ("attach".equalsIgnoreCase(key)||"body".equalsIgnoreCase(key)||"sign".equalsIgnoreCase(key)) {
sb.append("<"+key+">"+"<![CDATA["+value+"]]></"+key+">");
}else {
sb.append("<"+key+">"+value+"</"+key+">");
}
}
sb.append("</xml>");
return sb.toString();
}
//生成签名
public static String createSign(String characterEncoding,SortedMap<String,Object> parameters){
StringBuffer sb = new StringBuffer();
Set es = parameters.entrySet();
Iterator it = es.iterator();
while(it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
String k = (String)entry.getKey();
Object v = entry.getValue();
if(null != v && !"".equals(v)
&& !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + "");
String sign = MD5.md5(sb.toString()).toUpperCase();
return sign;
}
//请求方法
public static String httpsRequest(String requestUrl, String requestMethod, String data) {
try {
URL url = new URL(requestUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
// 设置请求方式（GET/POST）
conn.setRequestMethod(requestMethod);
conn.setRequestProperty("content-type", "application/json");
// conn.setRequestProperty("content-type", "text/xml;charset=utf-8");
// 当outputStr不为null时向输出流写数据
if (null != data) {
OutputStream outputStream = conn.getOutputStream();
// 注意编码格式
outputStream.write(data.getBytes("UTF-8"));
outputStream.close();
}
// 从输入流读取返回内容
InputStream inputStream = conn.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String str = null;
StringBuffer buffer = new StringBuffer();
while ((str = bufferedReader.readLine()) != null) {
buffer.append(str);
}
// 释放资源
bufferedReader.close();
inputStreamReader.close();
inputStream.close();
inputStream = null;
conn.disconnect();
return buffer.toString();
} catch (ConnectException ce) {
System.out.println("连接超时：{}"+ ce);
} catch (Exception e) {
System.out.println("https请求异常：{}"+ e);
}
return null;
}
public static void main(String[] args) {
String requestUrl,requestMethod,outputStr;
requestUrl="（此处填写你要请求的url地址）";
requestMethod="POST";
outputStr="<xml>"+
"<appid><![CDATA[wx2421b1c4370ec43b]]></appid>"+
"<mch_id><![CDATA[10000100]]></mch_id>"+
"<device_info><![CDATA[1]]></device_info>"+
"<nonce_str><![CDATA[5d2b6c2a8db53831f7eda20af46e531c]]></nonce_str>"+
"<sign><![CDATA[6245928B869A39BC75A421200A74002E]]></sign>"+
"<result_code><![CDATA[SUCCESS]]></result_code>"+
"<return_code><![CDATA[SUCCESS]]></return_code>"+
"<err_code><![CDATA[1004400740201409030005092168]]></err_code>"+
"<err_code_des><![CDATA[1004400740201409030005092168]]></err_code_des>"+
"<openid><![CDATA[oUpF8uMEb4qRXf22hE3X68TekukE]]></openid>"+
"<is_subscribe><![CDATA[Y]]></is_subscribe>"+
"<trade_type><![CDATA[JSAPI]]></trade_type>"+
"<bank_type><![CDATA[CFT]]></bank_type>"+
"<total_fee><![CDATA[1]]></total_fee>"+
"<fee_type><![CDATA[CNY]]></fee_type>"+
"<cash_fee><![CDATA[168]]></cash_fee>"+
"<cash_fee_type><![CDATA[1004400740201409030005092168]]></cash_fee_type>"+
"<transaction_id><![CDATA[1004400740201409030005092168]]></transaction_id>"+
"<out_trade_no><![CDATA[137999992017032919767558710]]></out_trade_no>"+
"<time_end><![CDATA[20140903131540]]></time_end>"+
"<trade_state><![CDATA[1]]></trade_state>"+
"<attach><![CDATA[支付测试]]></attach>"+
"</xml>";
//错误的json请求
// String data = "[{\"id\":1,\"name\":\"o2o_V3.0新版发布\",\"content\":\"o2o_V3.0新版发布\",\"time\":\"2015-05-11 03:12:51\"}]";
String data = "{\"id\":1,\"name\":\"o2o_V3.0新版发布\",\"content\":\"o2o_V3.0新版发布\",\"time\":\"2015-05-11 03:12:51\"}";
String xml=httpsRequest(requestUrl,requestMethod,data);
System.out.println(xml);
//System.out.println(outputStr);
}
} 请求的时候只需要调用这个类中的httpsRequest方法，requestUrl代表的就是请求的url地址，requestMethod代表的是以Post或者Get方法请求方式，data就是请求的参数；