使用的是httpclient 3.1，
使用"httpclient"4的写法相对简单点，百度：httpclient https post
当不需要使用任何证书访问https网页时，只需配置信任任何证书
其中信任任何证书的类MySSLProtocolSocketFactory
主要代码：
HttpClient client = new HttpClient();
Protocol myhttps = new Protocol("https", new MySSLProtocolSocketFactory(), 443);
Protocol.registerProtocol("https", myhttps);
PostMethod method = new PostMethod(url);
HttpUtil
Java代码 
package com.urthinker.wxyh.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Map;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.URIException;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;
import org.apache.commons.httpclient.methods.StringRequestEntity;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.commons.httpclient.protocol.Protocol;
import org.apache.commons.httpclient.util.URIUtil;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* HTTP工具类
* 发送http/https协议get/post请求，发送map，json，xml，txt数据
*
* @author happyqing 2016-5-20
*/
public final class HttpUtil {
private static Log log = LogFactory.getLog(HttpUtil.class);
/**
* 执行一个http/https get请求，返回请求响应的文本数据
*
* @param url 请求的URL地址
* @param queryString 请求的查询参数,可以为null
* @param charset 字符集
* @param pretty 是否美化
* @return 返回请求响应的文本数据
*/
public static String doGet(String url, String queryString, String charset, boolean pretty) {
StringBuffer response = new StringBuffer();
HttpClient client = new HttpClient();
if(url.startsWith("https")){
//https请求
Protocol myhttps = new Protocol("https", new MySSLProtocolSocketFactory(), 443);
Protocol.registerProtocol("https", myhttps);
}
HttpMethod method = new GetMethod(url);
try {
if (StringUtils.isNotBlank(queryString))
//对get请求参数编码，汉字编码后，就成为%式样的字符串
method.setQueryString(URIUtil.encodeQuery(queryString));
client.executeMethod(method);
if (method.getStatusCode() == HttpStatus.SC_OK) {
BufferedReader reader = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(), charset));
String line;
while ((line = reader.readLine()) != null) {
if (pretty)
response.append(line).append(System.getProperty("line.separator"));
else
response.append(line);
}
reader.close();
}
} catch (URIException e) {
log.error("执行Get请求时，编码查询字符串“" + queryString + "”发生异常！", e);
} catch (IOException e) {
log.error("执行Get请求" + url + "时，发生异常！", e);
} finally {
method.releaseConnection();
}
return response.toString();
}
/**
* 执行一个http/https post请求，返回请求响应的文本数据
*
* @param url 请求的URL地址
* @param params 请求的查询参数,可以为null
* @param charset 字符集
* @param pretty 是否美化
* @return 返回请求响应的文本数据
*/
public static String doPost(String url, Map<String, String> params, String charset, boolean pretty) {
StringBuffer response = new StringBuffer();
HttpClient client = new HttpClient();
if(url.startsWith("https")){
//https请求
Protocol myhttps = new Protocol("https", new MySSLProtocolSocketFactory(), 443);
Protocol.registerProtocol("https", myhttps);
}
PostMethod method = new PostMethod(url);
//设置参数的字符集
method.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,charset);
//设置post数据
if (params != null) {
//HttpMethodParams p = new HttpMethodParams();
for (Map.Entry<String, String> entry : params.entrySet()) {
//p.setParameter(entry.getKey(), entry.getValue());
method.setParameter(entry.getKey(), entry.getValue());
}
//method.setParams(p);
}
try {
client.executeMethod(method);
if (method.getStatusCode() == HttpStatus.SC_OK) {
BufferedReader reader = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(), charset));
String line;
while ((line = reader.readLine()) != null) {
if (pretty)
response.append(line).append(System.getProperty("line.separator"));
else
response.append(line);
}
reader.close();
}
} catch (IOException e) {
log.error("执行Post请求" + url + "时，发生异常！", e);
} finally {
method.releaseConnection();
}
return response.toString();
}
/**
* 执行一个http/https post请求， 直接写数据 json,xml,txt
*
* @param url 请求的URL地址
* @param params 请求的查询参数,可以为null
* @param charset 字符集
* @param pretty 是否美化
* @return 返回请求响应的文本数据
*/
public static String writePost(String url, String content, String charset, boolean pretty) {
StringBuffer response = new StringBuffer();
HttpClient client = new HttpClient();
if(url.startsWith("https")){
//https请求
Protocol myhttps = new Protocol("https", new MySSLProtocolSocketFactory(), 443);
Protocol.registerProtocol("https", myhttps);
}
PostMethod method = new PostMethod(url);
try {
//设置请求头部类型参数
//method.setRequestHeader("Content-Type","text/plain; charset=utf-8");//application/json,text/xml,text/plain
//method.setRequestBody(content); //InputStream,NameValuePair[],String
//RequestEntity是个接口，有很多实现类，发送不同类型的数据
RequestEntity requestEntity = new StringRequestEntity(content,"text/plain",charset);//application/json,text/xml,text/plain
method.setRequestEntity(requestEntity);
client.executeMethod(method);
if (method.getStatusCode() == HttpStatus.SC_OK) {
BufferedReader reader = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(), charset));
String line;
while ((line = reader.readLine()) != null) {
if (pretty)
response.append(line).append(System.getProperty("line.separator"));
else
response.append(line);
}
reader.close();
}
} catch (Exception e) {
log.error("执行Post请求" + url + "时，发生异常！", e);
} finally {
method.releaseConnection();
}
return response.toString();
}
public static void main(String[] args) {
try {
String y = doGet("http://video.sina.com.cn/life/tips.html", null, "GBK", true);
System.out.println(y);
// Map params = new HashMap();
// params.put("param1", "value1");
// params.put("json", "{\"aa\":\"11\"}");
// String j = doPost("http://localhost/uplat/manage/test.do?reqCode=add", params, "UTF-8", true);
// System.out.println(j);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
MySSLProtocolSocketFactory
Java代码
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.UnknownHostException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.SocketFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import org.apache.commons.httpclient.ConnectTimeoutException;
import org.apache.commons.httpclient.params.HttpConnectionParams;
import org.apache.commons.httpclient.protocol.ProtocolSocketFactory;
/**
* author by lpp
*
* created at 2010-7-26 上午09:29:33
*/
public class MySSLProtocolSocketFactory implements ProtocolSocketFactory {
private SSLContext sslcontext = null;
private SSLContext createSSLContext() {
SSLContext sslcontext = null;
try {
// sslcontext = SSLContext.getInstance("SSL");
sslcontext = SSLContext.getInstance("TLS");
sslcontext.init(null,
new TrustManager[] { new TrustAnyTrustManager() },
new java.security.SecureRandom());
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (KeyManagementException e) {
e.printStackTrace();
}
return sslcontext;
}
private SSLContext getSSLContext() {
if (this.sslcontext == null) {
this.sslcontext = createSSLContext();
}
return this.sslcontext;
}
public Socket createSocket(Socket socket, String host, int port, boolean autoClose)
throws IOException, UnknownHostException {
return getSSLContext().getSocketFactory().createSocket(socket, host, port, autoClose);
}
public Socket createSocket(String host, int port) throws IOException, UnknownHostException {
return getSSLContext().getSocketFactory().createSocket(host, port);
}
public Socket createSocket(String host, int port, InetAddress clientHost, int clientPort)
throws IOException, UnknownHostException {
return getSSLContext().getSocketFactory().createSocket(host, port, clientHost, clientPort);
}
public Socket createSocket(String host, int port, InetAddress localAddress,
int localPort, HttpConnectionParams params) throws IOException,
UnknownHostException, ConnectTimeoutException {
if (params == null) {
throw new IllegalArgumentException("Parameters may not be null");
}
int timeout = params.getConnectionTimeout();
SocketFactory socketfactory = getSSLContext().getSocketFactory();
if (timeout == 0) {
return socketfactory.createSocket(host, port, localAddress, localPort);
} else {
Socket socket = socketfactory.createSocket();
SocketAddress localaddr = new InetSocketAddress(localAddress, localPort);
SocketAddress remoteaddr = new InetSocketAddress(host, port);
socket.bind(localaddr);
socket.connect(remoteaddr, timeout);
return socket;
}
}
// 自定义私有类
private static class TrustAnyTrustManager implements X509TrustManager {
public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
public X509Certificate[] getAcceptedIssuers() {
return new X509Certificate[] {};
}
}
}
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