最近项目要调用快递鸟查询快递信息，但是快递鸟的demo只有java .net php 三个版本，

还好懂一点java ，自己翻译了一下官方demo,翻译的时候涉及到了C基础，以及MD5和base64知识

有使用的可以直接使用下面的code:( java ——> OC)
.h

//
//  BWExpressInfo.h
//  BookWay
//
//  Created by 陶亚利 on 2016/12/7.
//  Copyright © 2016年 陶亚利. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface BWExpressInfo : NSObject

+ (void)getExpressInfo:(NSDictionary*)parameters block:(void (^) (NSInteger sucess,NSDictionary *dataDict,NSString *error))block;

@end

.m

//
//  BWExpressInfo.m
//  BookWay
//
//  Created by 陶亚利 on 2016/12/7.
//  Copyright © 2016年 陶亚利. All rights reserved.
//

#import "BWExpressInfo.h"
#import <UIKit/UIKit.h>
#import <CommonCrypto/CommonDigest.h>
#import "AFNetworking.h"

#define CC_MD5_DIGEST_LENGTH 32

@implementation BWExpressInfo

static char base64EncodeChars[] = {
    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
    'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
    'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
    'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
    'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
    'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
    'w', 'x', 'y', 'z', '0', '1', '2', '3',
    '4', '5', '6', '7', '8', '9', '+', '/' };

+ (void)getExpressInfo:(NSDictionary *)parameters block:(void (^)(NSInteger, NSDictionary *, NSString *))block  {
    // 快递鸟  注册时的字段   填写你的app对应的字段
    NSString *EBusinessID = @"XXXXXXX";
    NSString *AppKey = @"XXXXXXXXXXXX";
// 快递鸟  快递信息查询时不同的类型对应不同的链接
    NSString *ReqURL = @"http://api.kdniao.cc/Ebusiness/EbusinessOrderHandle.aspx";
    
    NSString *requestStr = [NSString stringWithFormat:@"{'OrderCode':'','ShipperCode':'%@','LogisticCode':'%@'}",parameters[@"expCode"],parameters[@"expNo"]];
    
   // NSLog(@"requestDataString = %@",requestStr);
    
    NSString *encodePath = [BWExpressInfo urlEncoder:requestStr];
    
    NSString *dataSign = [BWExpressInfo encrypt:requestStr keyValue:AppKey charset:@"UTF-8"];
    
    NSString *dataSignEncoder = [BWExpressInfo urlEncoder:dataSign];
    
    NSDictionary *requestParameters = @{@"RequestData":encodePath,@"EBusinessID":EBusinessID,@"RequestType":@"1002",@"DataSign":dataSignEncoder,@"DataType":@"2"};
    
    [BWExpressInfo PostExpressInfo:ReqURL params:requestParameters block:^(NSInteger sucess, NSDictionary *dataDict, NSString *error) {
        if (sucess == 0) {
            
            block(0,dataDict,nil);
        } else{
            
            block(1,dataDict,nil);
        }
    }];
}

+ (void)PostExpressInfo:(NSString *)urlString params:(NSDictionary *)parameters block:(void (^) (NSInteger sucess, NSDictionary *dataDict, NSString *error))block{
    
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    [manager POST:urlString parameters:parameters success:^(NSURLSessionDataTask *task, id responseObject) {
        
        if (block) {
            block(0, responseObject,nil);
        }
    } failure:^(NSURLSessionDataTask *task, NSError *error) {
        block(1,nil,nil);
    }];
}

+ (NSData*)JSONData:(NSDictionary *)dict{
    NSError* error = nil;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict
                                                       options:NSJSONWritingPrettyPrinted
                                                         error:&error];
    if ([jsonData length] > 0 && error == nil){
        return jsonData;
    }else{
        return nil;
    }
}


+ (NSString *)urlEncoder:(NSString *)urlStr{
    
    NSString *encodePath = nil;
    if ([[UIDevice currentDevice].systemVersion floatValue] > 7.0) {
        encodePath = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    }else{
        encodePath = [urlStr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet characterSetWithCharactersInString:@"`#%^{}\"[]|\\<> "].invertedSet];
    }
    
    return encodePath;
}

+ (NSString *) encrypt:(NSString *)content keyValue:(NSString *)keyValue charset:(NSString *)charset{
    
    if (keyValue != nil) {
        
        return [BWExpressInfo base64:[BWExpressInfo MD5:[NSString stringWithFormat:@"%@%@",content,keyValue] charset:charset] charset:charset];
    }
    
    return [BWExpressInfo base64:[BWExpressInfo MD5:content charset:charset] charset:charset];
}


+ (NSString *)base64:(NSString *)str charset:(NSString *)charset{
    
    return [BWExpressInfo base64Encode:str];
}

+ (NSString *)base64Encode:(NSString *)dataStr{
    
    NSData *data = [dataStr dataUsingEncoding:NSUTF8StringEncoding];
    
    Byte *dataBuffer = (Byte*)[data bytes];
    
    NSMutableString *resultStr = [NSMutableString string];
    NSInteger len = [data length];
    NSInteger i = 0;
    NSInteger b1,b2,b3;
    while (i < len) {
        b1 = dataBuffer[i++] & 0xff;

        if (i==len) {
            
//            char c = base64EncodeChars[b1 >> 2];
            [resultStr appendString:[NSString stringWithFormat:@"%c",base64EncodeChars[b1 >> 2]]];
            [resultStr appendString:[NSString stringWithFormat:@"%c",base64EncodeChars[(b1 & 0x3) << 4]]];
            [resultStr appendString:@"=="];
            break;
        }
        
        b2 = dataBuffer[i++] & 0xff;
        
        if (i==len) {
            [resultStr appendString:[NSString stringWithFormat:@"%c",base64EncodeChars[b1 >> 2]]];
            [resultStr appendString:[NSString stringWithFormat:@"%c",base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >> 4)]]];
            //NSLog(@"b2 resultStr == %@",resultStr);
            [resultStr appendString:[NSString stringWithFormat:@"%c",base64EncodeChars[(b2 & 0x0f) << 2]]];
            [resultStr appendString:@"="];
            break;
        }
        b3 = dataBuffer[i++] & 0xff;
        [resultStr appendString:[NSString stringWithFormat:@"%c",base64EncodeChars[b1 >> 2]]];
        [resultStr appendString:[NSString stringWithFormat:@"%c",base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >> 4)]]];
        [resultStr appendString:[NSString stringWithFormat:@"%c",base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >> 6)]]];
        [resultStr appendString:[NSString stringWithFormat:@"%c",base64EncodeChars[b3 & 0x3f]]];
    }
    
    //NSLog(@"base64Encode == %@",resultStr);
    
    return resultStr;
}


+ (NSString *)MD5:(NSString *)str charset:(NSString *)charset{
    
    const char *original_str = [str UTF8String];
    unsigned char result[CC_MD5_DIGEST_LENGTH];
    CC_MD5(original_str, strlen(original_str), result);
    NSMutableString *hash = [NSMutableString string];
    
    for (int i = 0; i < 16; i++){
        
        [hash appendFormat:@"%02X", result[i]];
    }
    
    //NSLog(@"MD5 == %@",[hash lowercaseString]);
    return [hash lowercaseString];
}

@end