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package cn.com.taiji.oosweb.httpserver;

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.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import cn.com.taiji.oosweb.manager.helper.JsonUtil;
import cn.com.taiji.oosweb.web.wx.authdeny.NetTools;

import net.sf.json.JSONObject;

public class method {
static String appsecret ="";
static String appId ="";

@SuppressWarnings("deprecation")
public static void main(String[] args) {

appId = "wx2faec6d97bb8d50a";
appsecret = "ed4a837d65d26018e4eb96cc1006c078";
String requestUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";
//获取access_token
requestUrl = requestUrl.replace("APPID", appId);
requestUrl = requestUrl.replace("APPSECRET", appsecret);
JSONObject jsonObject = NetTools.httpsRequest(requestUrl, "GET", null);
String access_token = (String) jsonObject.get("access_token");
String str = getTemporaryQR("910000000010000000001000000000",access_token);
JSONObject jsonObject1 = JsonUtil.getJSONObject(str);
System.err.println(jsonObject1.get("url"));



String mblbUrl = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket="+java.net.URLEncoder.encode((String) jsonObject1.get("ticket"));
System.err.println((String) jsonObject1.get("ticket"));
// mblbUrl = mblbUrl.replace("TICKET",java.net.URLEncoder.encode((String) jsonObject1.get("ticket")) );
// System.err.println(mblbUrl);
JSONObject mblb = NetTools.httpsRequest(mblbUrl, "GET", null);
// System.out.println(mblb);
downloadFile(mblbUrl,"C:/");
}


public static Boolean downloadFile(String urlString, String filePath){
// 构造URL
URL url;
try {
url = new URL(urlString);
// 打开连接
URLConnection con;
try {
con = url.openConnection();
// 输入流
InputStream is = con.getInputStream();
// 1K的数据缓冲
byte[] bs = new byte[1024];
// 读取到的数据长度
int len;
// 输出的文件流
OutputStream os = new FileOutputStream(filePath);
// 开始读取
while ((len = is.read(bs)) != -1) {
os.write(bs, 0, len);
}
// 完毕，关闭所有链接
os.close();
is.close();
return true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}

} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}

}









public static String getTemporaryQR(String scene_id,String access_token){
//获取数据的地址（微信提供）
String url = "https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token="+access_token;

//发送给微信服务器的数据
String jsonStr = "{"expire_seconds": 2592000,"action_name": "QR_SCENE", "action_info": {"scene": {"scene_id": "+scene_id+"}}}";

//将得到的字符串转化成json对象
String response = sendPost(jsonStr, url);
return response.toString();
}




public static String sendPost(String param, String url) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.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
conn.setDoOutput(true);
conn.setDoInput(true);
// 获取URLConnection对象对应的输出流
// out = new PrintWriter(conn.getOutputStream());
out = new PrintWriter(new OutputStreamWriter(
conn.getOutputStream(), "utf-8"));
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(
conn.getInputStream(), "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);
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;
}

}

来源:http://www.cnblogs.com/xyabk/p/5776317.html