http使用权限签名算法

http使用权限签名算法

创建SignCheck.java签名算法文件

package com.crs.ticket.utils;

import java.io.UnsupportedEncodingException;
import java.security.SignatureException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.crs.ticket.utils.httpclient.HttpProtocolHandler;
import com.crs.ticket.utils.httpclient.HttpRequest;
import com.crs.ticket.utils.httpclient.HttpResponse;
import com.crs.ticket.utils.httpclient.HttpResultType;

/** 
* 功能：MD5签名处理核心文件，不需要修改
* 版本：1.0
* 修改日期：2014-09-19
* 说明：
* */

public class SignCheck {
    
    private static Logger logger = LoggerFactory.getLogger(SignCheck.class);

    /**
     * @param content
     * @param charset
     * @return
     * @throws SignatureException
     * @throws UnsupportedEncodingException 
     */
    private static byte[] getContentBytes(String content, String charset) {
        if (charset == null || "".equals(charset)) {
            return content.getBytes();
        }
        try {
            return content.getBytes(charset);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("MD5签名过程中出现错误,指定的编码集不对,您目前指定的编码集是:" + charset);
        }
    }

    /** 
     * 除去数组中的空值和签名参数
     * @param sArray 签名参数组
     * @return 去掉空值与签名参数后的新签名参数组
     */
    public static Map<String, String> paraFilter(Map<String, String> sArray) {

        Map<String, String> result = new HashMap<String, String>();

        if (sArray == null || sArray.size() <= 0) {
            return result;
        }

        for (String key : sArray.keySet()) {
            String value = sArray.get(key);
            if (value == null || value.equals("") || key.equalsIgnoreCase("sign")
                || key.equalsIgnoreCase("sign_type")) {
                continue;
            }
            result.put(key, value);
        }
        
        return result;
    }



    public static String createLinkString(Map<String, String> params) {

        List<String> keys = new ArrayList<String>(params.keySet());
        Collections.sort(keys);

        String prestr = "";

        for (int i = 0; i < keys.size(); i++) {
            String key = keys.get(i);
            String value = params.get(key);

            if (i == keys.size() - 1) {//拼接时，不包括最后一个&字符
                prestr = prestr + key + "=" + value;
            } else {
                prestr = prestr + key + "=" + value + "&";
            }
        }

        return prestr;
    }
    
    /**
     * MAP类型数组转换成NameValuePair类型
     * 
     * @param properties
     *            MAP类型数组
     * @return NameValuePair类型数组
     */
    private static NameValuePair[] generatNameValuePair(
            Map<String, String> properties) {
        NameValuePair[] nameValuePair = new NameValuePair[properties.size()];
        int i = 0;
        for (Map.Entry<String, String> entry : properties.entrySet()) {
            nameValuePair[i++] = new NameValuePair(entry.getKey(),
                    entry.getValue());
        }

        return nameValuePair;
    }
    
    //默认的加密编码
    public static String DEFAULT_INPUT_CHARSET = "UTF-8";
    
    /**
    
    /**
     * 根据传入参数获取签名字符串
     * @param params
     * @return
     */
    public static String getSignByMap(Map<String,String> params,String key){
        //过滤空值、sign与sign_type参数
        Map<String, String> sParaNew = paraFilter(params);
        //获取待签名字符串
        String text = createLinkString(sParaNew);
        //获取签名字符集
        String input_charset = "UTF-8";
        
        text = text + key;
        String mysign = DigestUtils.md5Hex(getContentBytes(text, input_charset));
        
        return mysign;
    }
}