package com.httpGetTest;

import java.beans.Encoder;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.util.HashMap;
import java.util.Map;

public class CreatHttpUrl {

	public static void main(String[] args) {
		
		System.out.print(creatUrl("teacher", "en","zh-CHS"));
	}
	static String appKeyID = "7743eee7f7e11d75";
	static String appKey = "bwPochuFLSutY4nGvyJoeUNn9GBQduzl";
	
	/**
	 *  生成有道URL
	 * @param 要搜索的词
	 * @param 源语言
	 * @param 目标语言
	 * @return
	 */
	public static String creatUrl(String query,String from,String to)
	{
		
		String salt = String.valueOf(System.currentTimeMillis());
		String sign = md5(appKeyID + query + salt + appKey);
		Map<String, String> params = new HashMap<String,String>();
		params.put("q", query);
		params.put("from", from);
		params.put("to", to);
		params.put("sign", sign);
		params.put("salt", salt);
		params.put("appKey", appKeyID);
		
		String urlStr = "https://openapi.youdao.com/api";
		return getUrlWithQueryString(urlStr, params);

	}
	public static String createParam(String query,String from,String to)
	{
		String salt = String.valueOf(System.currentTimeMillis());
		String sign = md5(appKeyID + query + salt + appKey);
		Map<String, String> params = new HashMap<String,String>();
		params.put("q", query);
		params.put("from", from);
		params.put("to", to);
		params.put("sign", sign);
		params.put("salt", salt);
		params.put("appKey", appKeyID);
		
		String urlStr = "";
		return getUrlWithQueryString(urlStr, params);
	}
	/**
	 *  生成32位md5摘要
	 * @param str
	 * @return
	 */
	public static String md5(String string)
	{
		if(string == null)
		{
			return null;
		}
		char hexDigits[] = {‘0‘,‘1‘,‘2‘,‘3‘,‘4‘,‘5‘,‘6‘,‘7‘,‘8‘,‘9‘,‘A‘,‘B‘,‘C‘,‘D‘,‘E‘,‘F‘};
		byte [] btInput = string.getBytes();
		try {
			/** 获得MD5摘要算法的 MessageDigest对象 **/
			MessageDigest mdInst = MessageDigest.getInstance("MD5");
			/** 使用指定的字节更新摘要 **/
			mdInst.update(btInput);
			/** 获得密文 **/
			byte []md = mdInst.digest();
			/** 把密文转换成十六进制的字符串形式 **/
			int j = md.length;
			char str[] = new char[j*2];
			int k = 0;
			for(byte byte0 : md){
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
            e.printStackTrace();
            return null;
		}
	}
    public static String getUrlWithQueryString(String url,Map<String, String>params)
    {
    	if (params == null) {
			return url;
		}
    	
    	StringBuilder builder = new StringBuilder(url);
    	if (url.contains("?")) {
			builder.append("&");
		} else {
            builder.append("?");
		}
    	
    	int i = 0;
        for (String key : params.keySet()) {
			String value = http://www.mamicode.com/params.get(key);"";	
		}
		
		try {
			return URLEncoder.encode(input,"utf-8");
		} catch (Exception e) {
            e.printStackTrace();
		}
		return input;
	}
}