Java Http接口加签、验签操作

1、业务背景

最近接触了一些电商业务，发现在处理电商业务接口时，比如淘宝、支付类接口，接口双方为了确保数据参数在传输过程中未经过篡改，都需要对接口数据进行加签，然后在接口服务器端对接口参数进行验签，确保两个签名是一样的，验签通过之后再进行业务逻辑处理。我们这里主要介绍一下处理思路，至于签名算法我不做过多介绍，网上一大堆。

2、处理思路

双方约定好，参数按特定顺序排列，比如按首字母的顺序排列，如url:http://xxx/xxx.do?a=wersd&b=sd2354&c=4&signature=XXXXXXXXXXXX(signature为传入的签名)，等你拿到入参后，将参数串a=wersd&b=sd2354&c=4按你们约定的签名规则，自己用md5加签一次，然后和入参的signature值对比，以确认调用者是否合法，这就是接口签名验证的思路。

3、实例练习

接口双方经过沟通，对接口达成如下共识：

1、注意事项，主要指接口的的协议、传入参数类型、签名算法、文件格式等说明

2、下面是一个电商业务接口的真实案例，双方约定好了接口URL、业务参数、固定参数、签名以及返回数据格式

接口调用时，接口调用方代码如下(仅供参考)：

package com.pcmall;

import java.io.BufferedReader;					
import java.io.DataOutputStream;					
import java.io.IOException;					
import java.io.InputStreamReader;					
import java.io.UnsupportedEncodingException;					
import java.net.HttpURLConnection;					
import java.net.URL;					
import java.net.URLEncoder;					
import java.security.MessageDigest;					
import java.security.NoSuchAlgorithmException;					
import java.util.ArrayList;					
import java.util.Collections;					
import java.util.Iterator;					
import java.util.List;					
import java.util.Map;					
import java.util.TreeMap;
					
public class APITest {					
    static String TEST_URL = "待定";					
    static String TEST_KEY = "待定";					
    static String TEST_SEC = "待定";					
    					
    public static void main(String[] args) throws UnsupportedEncodingException, NoSuchAlgorithmException {					
        String result = getResult(TEST_URL, getReqParam());					
        System.out.print(result);					
    }					
					
    private static String getReqParam() throws UnsupportedEncodingException, NoSuchAlgorithmException {					
    	TreeMap req = new TreeMap();			
        req.put("a", TEST_KEY);					
        req.put("f", "json");					
        req.put("l", "zh_CN");					
        req.put("m", "zhongan.repair.query");					
        req.put("v", "1.0");					
        req.put("i", "" + System.currentTimeMillis() / 1000);					
        req.put("params", "{\"assignNo\":\"TEST018\"}");					
        req.put("s", sign(req, null, TEST_SEC));					
        					
        StringBuilder param = new StringBuilder();					
        for (Iterator> it = req.entrySet().iterator(); it.hasNext();) {					
            Map.Entry e = it.next();					
            param.append("&").append(e.getKey()).append("=").append(URLEncoder.encode(e.getValue(), "UTF-8"));					
        }					
        					
        return param.toString().substring(1);					
    }					
    					
    private static String sign(Map paramValues, List ignoreParamNames, String secret) throws NoSuchAlgorithmException, UnsupportedEncodingException {					
        StringBuilder sb = new StringBuilder();					
        List paramNames = new ArrayList(paramValues.size());					
        paramNames.addAll(paramValues.keySet());					
        if (ignoreParamNames != null && ignoreParamNames.size() > 0) {					
            for (String ignoreParamName : ignoreParamNames) {					
                paramNames.remove(ignoreParamName);					
            }					
        }					
        Collections.sort(paramNames);					
        					
        sb.append(secret);					
        for (String paramName : paramNames) {					
            sb.append(paramName).append(paramValues.get(paramName));					
        }					
        sb.append(secret);					
					
        MessageDigest md = MessageDigest.getInstance("SHA-1");					
        return byte2hex(md.digest(sb.toString().getBytes("UTF-8")));					
    }					
    					
    private static String byte2hex(byte[] bytes) {					
        StringBuilder sign = new StringBuilder();					
        for (int i = 0; i < bytes.length; i++) {					
            String hex = Integer.toHexString(bytes[i] & 0xFF);					
            if (hex.length() == 1) {					
                sign.append("0");					
            }					
            sign.append(hex.toUpperCase());					
        }					
        return sign.toString();					
    }					
    					
    private static String getResult(String urlStr, String content) {					
        URL url = null;					
        HttpURLConnection connection = null;					
        try {					
            url = new URL(urlStr);					
            connection = (HttpURLConnection) url.openConnection();					
            connection.setDoOutput(true);					
            connection.setDoInput(true);					
            connection.setRequestMethod("POST");					
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");					
            connection.setUseCaches(false);					
            connection.connect();					
            					
            DataOutputStream out = new DataOutputStream(connection.getOutputStream());					
            out.write(content.getBytes("UTF-8"));					
            out.flush();					
            out.close();					
            					
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));					
            StringBuffer buffer = new StringBuffer();					
            String line = "";					
            while ((line = reader.readLine()) != null) {					
                buffer.append(line);					
            }					
            reader.close();					
					
            return buffer.toString();					
        } catch (IOException e) {					
            e.printStackTrace();					
        } finally {					
            if (connection != null) {					
                connection.disconnect();					
            }					
        }					
        					
        return null;					
    }	
    
    
}				

服务器端代码如下(仅供参考)：

@RequestMapping("/repairTakeOrder")
	@ResponseBody
	public ResponseVO repairTakeOrder(@RequestBody String jsonStr) {
		logger.info("repairTakeOrder入参：" + jsonStr);

		ResponseVO responseVO = null;
		try {
			RepairOrder repairOrder = JackJsonUtil.toBean(jsonStr,
					RepairOrder.class);
			TreeMap paramsMap = new TreeMap();
			paramsMap.put("gsxx01", repairOrder.getGsxx01());
			paramsMap.put("orderType", repairOrder.getOrderType().toString());
			paramsMap.put("serviceNo", repairOrder.getServiceNo());
			paramsMap.put("vipCard", repairOrder.getVipCard());
			paramsMap.put("customerName", repairOrder.getCustomerName());
			paramsMap.put("customerPhone", repairOrder.getCustomerPhone());
			paramsMap.put("customerTel", repairOrder.getCustomerTel());
			paramsMap.put("province", repairOrder.getProvince());
			paramsMap.put("city", repairOrder.getCity());
			paramsMap.put("county", repairOrder.getCounty());
			paramsMap.put("address", repairOrder.getAddress());
			paramsMap.put("salerCode", repairOrder.getSalerCode());
			paramsMap.put("salerName", repairOrder.getSalerName());
			paramsMap.put("storeCode", repairOrder.getStoreCode());
			paramsMap.put("storeName", repairOrder.getStoreName());
			paramsMap.put("site", repairOrder.getSite());

			paramsMap.put("siteDesp", repairOrder.getSiteDesp());
			paramsMap.put("engineerCode", repairOrder.getEngineerCode());
			paramsMap.put("engineerName", repairOrder.getEngineerName());
			if (repairOrder.getServiceDate() != null) {
				paramsMap.put("serviceDate",
						DateUtils.formatDate(repairOrder.getServiceDate()));
			}

			if (repairOrder.getSalePrice() != null) {
				paramsMap.put("salePrice", repairOrder.getSalePrice()
						.toString());
			}

			paramsMap.put("profitCenter", repairOrder.getProfitCenter());
			paramsMap.put("costCenter", repairOrder.getCostCenter());
			paramsMap.put("gsxx02", repairOrder.getGsxx02());
			paramsMap.put("returnReason", repairOrder.getReturnReason());
			if (repairOrder.getOriOrder() != null) {
				paramsMap.put("oriOrder", repairOrder.getOriOrder().toString());
			}

			if (repairOrder.getOriServiceNo() != null) {
				paramsMap.put("oriServiceNo", repairOrder.getOriServiceNo());
			}

			// 拼接签名原串(a=1&b=2)
			String paramSrc = RequestUtils.getParamSrc(paramsMap);
			logger.info("签名原串：" + paramSrc);
			//进行验签操作
			if (SignUtils.verifymd5(paramSrc, repairOrder.getSign())) {
				//处理业务逻辑
				responseVO=erpServiceImpl.repairTakeOrder(repairOrder);
				
			} else {
				responseVO = new ResponseVO();
				responseVO.setSuccess(false);
				responseVO.setErrorMsg("验签失败");
			}

		} catch (Exception e) {
			logger.error("", e);
			responseVO = new ResponseVO();
			responseVO.setSuccess(false);
			responseVO.setErrorMsg(StringUtils.isNotBlank(e.getMessage()) ? e.getMessage() : "后台异常");
		}
		return responseVO;

	}