FJHttp.request获取网络数据示例

/** FJHttp.request获取网络数据示例。
* 对在特殊情况出现的java.net.UnknownHostException，自动执行一次解析域名转化为ip再次进行访问 */
public static void main(String[] args)
{
try
{
String url = "https://www.baidu.com/";							// 网址
HashMap<String, String> params = new HashMap<String, String>();	// 参数
params.put("param1", "0001");
params.put("param1", "0001");

String rdata = FJHttp.request(url, params, "post");				// 获取网络数据
System.out.println(rdata);
}
catch (Exception e)
{
e.printStackTrace();
}
}

package com.fxlib.util;

import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;

import android.util.Log;

/** FJHttp.java: ----- 2017-4-12 下午8:37:35 wangzhongyuan */
public class FJHttp
{

public static final String DEFAULT_CHARSET = "UTF-8";
private static int mConnectTimeout = 5000;
private static int mReadTimeout = 15000;

public static void setConnectTimeout(int connectTimeout)
{
mConnectTimeout = connectTimeout;
}

public static void setReadTimeout(int readTimeout)
{
mReadTimeout = readTimeout;
}

/** http请求，获取网页信息 */
public static String request(String http, HashMap<String, String> map, String method) throws Exception
{
if (method == null || method.equals("")) method = "post";

String data = "";
Exception e0 = null;
try
{
data = request(http, praseMap(map, DEFAULT_CHARSET), method, DEFAULT_CHARSET);				// 使用正常的域名访问
}
catch (Exception ex)
{
e0 = ex;
}

if (e0 != null)		// 若通过域名直接访问失败，则通过解析域名的ip，再次进行访问
{
try
{
data = request(getIpUrl(http), praseMap(map, DEFAULT_CHARSET), method, DEFAULT_CHARSET);// 使用域名对应的ip进行访问
}
catch (Exception ex)
{
throw e0;
}
}

return data;
}

public static String request(String http, HashMap<String, String> map, String method, String charset) throws Exception
{
return request(http, praseMap(map, charset), method, charset);
}

public static String request(String http, String data, String method) throws Exception
{
return request(http, data, method, DEFAULT_CHARSET);
}

public static String request(String http, String data, String method, String charset) throws Exception
{
data = (data == null) ? "" : data;
if ("GET".equalsIgnoreCase(method) && !"".equals(data))
{
http += "?" + data;
data = "";
}

HttpURLConnection conn = (HttpURLConnection) new URL(http).openConnection();
conn.setRequestMethod("POST");
conn.setConnectTimeout(mConnectTimeout);
conn.setReadTimeout(mReadTimeout);
if ("POST".equalsIgnoreCase(method)) conn.setDoOutput(true);
conn.setDoInput(true);
conn.connect();

// send data
if (!"".equals(data))
{
OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(), charset);
writer.write(data);
writer.flush();
writer.close();
}
// receive data
StringBuffer sb = new StringBuffer();
if (conn.getResponseCode() == 200)
{
InputStreamReader reader = new InputStreamReader(conn.getInputStream(), charset);
int len;
char[] buf = new char[1024];
while ((len = reader.read(buf)) != -1)
{
sb.append(buf, 0, len);
}
reader.close();
}
conn.disconnect();
return sb.toString();
}

/** 使用指定的字符集，转化map为http请求参数串 */
public static String praseMap(HashMap<String, String> map, String charset) throws Exception
{
if (charset == null || charset.equals("")) charset = "UTF-8";	// 默认字符集

StringBuffer sb = new StringBuffer();
if (map != null && !map.isEmpty())
{
for (String k : map.keySet())
{
if (k != null && !"".equals(k))
{
String v = map.get(k);
sb.append("&").append(k).append("=").append(URLEncoder.encode(v, charset));
}
}
}
String tmp = sb.toString();
return tmp.equals("") ? "" : tmp.substring(1);
}

/** 获取url中的域名信息 */
// LTSDK_ORDER_URL = "http://netuser_us.warfarestrike.com/order/allplat";
public static String getServerName(String url)
{
url = url.trim();

if (url.contains("//"))
{
int index = url.indexOf("//") + "//".length();
url = url.substring(index);		// netuser_us.warfarestrike.com/order/allplat
}
if (url.contains("/"))
{
int index = url.indexOf("/");
url = url.substring(0, index);	// netuser_us.warfarestrike.com
}

return url;
}

/** 解析域名为ip信息 */
// LTSDK_ORDER_URL = "http://netuser_us.warfarestrike.com/order/allplat";
public static String getIP(String url)
{
String ip = "";

try
{
String ServerName = getServerName(url);
InetAddress address = InetAddress.getByName(ServerName);
ip = address.getHostAddress().toString();

Log.i("FJHttp2:", " 域名(" + ServerName + ") ->> Ip(" + ip + ")");
}
catch (Exception e)
{
Log.i("FJHttp2", "域名(" + url + ")解析Ip失败！");
Log.e("FJHttp2", e.toString());
}

return ip;
}

/** 替换url中的主机域名为解析获得的ip */
public static String getIpUrl(String url)
{
String ServerName = getServerName(url);
String ip = getIP(url);
if (!ip.equals("")) url = url.replaceFirst(ServerName, ip);
return url;
}
}