JAVA实现http/https的Post、Get、代理访问请求

前言

CODE(复制即用)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.Socket;
import java.net.URL;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.HashMap;
import java.util.Map;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509ExtendedTrustManager;

public class HttpsUtils {

private static boolean proxySet = true;
private static String proxyHost = "127.0.0.1";
private static int proxyPort = 8080;

public static void main(String[] args) {

String url = "https://www.google.com";
String params = "";

String getResult = HttpsUtils.sendPost(url, params, proxySet);
System.out.println(getResult);
}

//设置请求头属性
public static Map<String, String> setProperty() {
HashMap<String, String> pMap = new HashMap<>();
// pMap.put("Accept-Encoding", "gzip"); //请求定义gzip,响应也是压缩包
pMap.put("connection", "Keep-Alive");
pMap.put("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
pMap.put("Content-Type", "application/x-www-form-urlencoded");
return pMap;
}

/**
* GET请求
*
* @param url
*            请求的URL
* @param param
*            请求参数，name1=value1&name2=value2 的形式
* @return 响应结果
*/
public static String sendGet(String url, String param, boolean isproxy) {
String result = "";
BufferedReader in = null;
try {
String urlNameString = url;
if (param != null && !("".equals(param)))
urlNameString = url + "?" + param;
URL realUrl = new URL(urlNameString);
// 打开和URL之间的连接
HttpURLConnection connection = null;
if (isproxy) {// 使用代理模式
@SuppressWarnings("static-access")
Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));
connection = (HttpURLConnection) realUrl.openConnection(proxy);
} else {
connection = (HttpURLConnection) realUrl.openConnection();
}

// https 忽略证书验证
if (url.substring(0, 5).equals("https")) {
SSLContext ctx = MyX509TrustManagerUtils();
((HttpsURLConnection) connection).setSSLSocketFactory(ctx.getSocketFactory());
((HttpsURLConnection) connection).setHostnameVerifier(new HostnameVerifier() {
@Override
public boolean verify(String arg0, SSLSession arg1) {
return true;
}
});
}

// 设置通用的请求属性
for (Map.Entry<String, String> entry : setProperty().entrySet()) {
connection.setRequestProperty(entry.getKey(), entry.getValue());
}
// 建立连接
connection.connect();
// 定义 BufferedReader输入流来读取URL的响应
if (connection.getResponseCode() == HttpURLConnection.HTTP_OK
|| connection.getResponseCode() == HttpURLConnection.HTTP_CREATED
|| connection.getResponseCode() == HttpURLConnection.HTTP_ACCEPTED) {
in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
} else {
in = new BufferedReader(new InputStreamReader(connection.getErrorStream(), "UTF-8"));
}
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.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;
}

/**
* POST请求
*
* @param url
*            发送请求的 URL
* @param param
*            请求参数 name1=value1&name2=value2 的形式
* @param isproxy
*            是否使用代理模式
* @return 响应结果
*/
public static String sendPost(String url, String param, boolean isproxy) {
OutputStreamWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
HttpURLConnection conn = null;
if (isproxy) {// 使用代理模式
@SuppressWarnings("static-access")
Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));
conn = (HttpURLConnection) realUrl.openConnection(proxy);
} else {
conn = (HttpURLConnection) realUrl.openConnection();
}

// https
if (url.substring(0, 5).equals("https")) {
SSLContext ctx = MyX509TrustManagerUtils();
((HttpsURLConnection) conn).setSSLSocketFactory(ctx.getSocketFactory());
((HttpsURLConnection) conn).setHostnameVerifier(new HostnameVerifier() {
//在握手期间，如果 URL 的主机名和服务器的标识主机名不匹配，则验证机制可以回调此接口的实现程序来确定是否应该允许此连接。
@Override
public boolean verify(String arg0, SSLSession arg1) {
return true;
}
});
}

// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setRequestMethod("POST"); // POST方法

// 设置通用的请求属性

for (Map.Entry<String, String> entry : setProperty().entrySet()) {
conn.setRequestProperty(entry.getKey(), entry.getValue());
}
conn.connect();

// 获取URLConnection对象对应的输出流
out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
// 发送请求参数
out.write(param);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
if (conn.getResponseCode() == HttpURLConnection.HTTP_OK
|| conn.getResponseCode() == HttpURLConnection.HTTP_CREATED
|| conn.getResponseCode() == HttpURLConnection.HTTP_ACCEPTED) {
in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
} else {
in = new BufferedReader(new InputStreamReader(conn.getErrorStream(), "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.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;
}

// ===========================utils===================

/**
* url编码
*
* @param source
*            待编码字符串
* @param encode
*            字符编码 eg:UTF-8
* @return 编码字符串
*/
public static String urlEncode(String source, String encode) {
String result = source;
try {
result = java.net.URLEncoder.encode(source, encode);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return "0";
}
return result;
}

/*
* HTTPS忽略证书验证,防止高版本jdk因证书算法不符合约束条件,使用继承X509ExtendedTrustManager的方式
*/
class MyX509TrustManager extends X509ExtendedTrustManager {

@Override
public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {
// TODO Auto-generated method stub

}

@Override
public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {
// TODO Auto-generated method stub

}

@Override
public X509Certificate[] getAcceptedIssuers() {
// TODO Auto-generated method stub
return null;
}

@Override
public void checkClientTrusted(X509Certificate[] arg0, String arg1, Socket arg2) throws CertificateException {
// TODO Auto-generated method stub

}

@Override
public void checkClientTrusted(X509Certificate[] arg0, String arg1, SSLEngine arg2)
throws CertificateException {
// TODO Auto-generated method stub

}

@Override
public void checkServerTrusted(X509Certificate[] arg0, String arg1, Socket arg2) throws CertificateException {
// TODO Auto-generated method stub

}

@Override
public void checkServerTrusted(X509Certificate[] arg0, String arg1, SSLEngine arg2)
throws CertificateException {
// TODO Auto-generated method stub

}

}

public static SSLContext MyX509TrustManagerUtils() {

TrustManager[] tm = { new HttpsUtils().new MyX509TrustManager() };
SSLContext ctx = null;
try {
ctx = SSLContext.getInstance("TLS");
ctx.init(null, tm, null);
} catch (Exception e) {
e.printStackTrace();
}
return ctx;
}

}