package com.zhao.test;

import java.lang.reflect.Field;

import java.math.BigDecimal;

import java.math.BigInteger;

import java.text.SimpleDateFormat;

import java.util.Collection;

import java.util.Date;

import java.util.HashMap;

import java.util.Map;

public class DigitalSign {

public static String getDigitalSign(Object arg, String secretKey)

throws Exception {

String digitalSign = "";

// 获取参与加密的值

Map<String, String> params = new HashMap<String, String>();// 参与加密的各项值存储在params中

objectToMap(arg, params);

String[] keys = new String[params.size()];

int keys_idx = 0;

for (Map.Entry<?, ?> keyEntry : params.entrySet()) {

keys[keys_idx] = (String) keyEntry.getKey();

keys_idx++;

}

// 排序

Bubble_sort(keys);

// 拼装数字签名内容

StringBuffer sb = new StringBuffer();

for (int i = 0; i < keys.length; i++) {

sb.append(keys[i]).append(params.get(keys[i]));

}

SimpleDateFormat sdf_yyyyMMdd = new SimpleDateFormat("yyyyMMdd");

sb.append(sdf_yyyyMMdd.format(new Date())).append(secretKey);

// 加密

// System.out.println("MD5加密报文："+URLEncoder.encode(sb.toString(),"UTF-8").toLowerCase());

// System.out.println("MD5加密报文："+sb.toString());

digitalSign = MD5.md5Encode(sb.toString());

// System.out.println("MD5加密后报文："+digitalSign);

return digitalSign;

}

private static boolean isPrimitives(Class<?> cls) {

if (cls.isArray()) {

return isPrimitive(cls.getComponentType());

}

return isPrimitive(cls);

}

private static boolean isPrimitive(Class<?> cls) {

return cls.isPrimitive() || cls.getClass().equals(String.class)

|| cls.getClass().equals(Integer.class)

|| cls.getClass().equals(Byte.class)

|| cls.getClass().equals(Long.class)

|| cls.getClass().equals(Double.class)

|| cls.getClass().equals(Float.class)

|| cls.getClass().equals(Character.class)

|| cls.getClass().equals(Short.class)

|| cls.getClass().equals(BigDecimal.class)

|| cls.getClass().equals(BigInteger.class)

|| cls.getClass().equals(Boolean.class)

|| Number.class.isAssignableFrom(cls)

|| Date.class.isAssignableFrom(cls);

}

public static void objectToMap(Object arg, Map<String, String> params)

throws Exception {

if (arg != null && !isPrimitives(arg.getClass())) {

if (Map.class.isInstance(arg)) {

for (Map.Entry<?, ?> entry : ((Map<?, ?>) arg).entrySet()) {

try {

params.put((String) entry.getKey(),

(String) entry.getValue());// 无法强转为String类型的参数不参与加密

} catch (Exception e) {

continue;

}

}

} else {

Class<?> cls = arg.getClass();

Field[] fs = cls.getDeclaredFields();

Field[] superfs = cls.getSuperclass().getDeclaredFields();

for (int i = 0; i < superfs.length; i++) {

objectToMap_field(arg,superfs[i],params);

}

for (int i = 0; i < fs.length; i++) {

objectToMap_field(arg,fs[i],params);

}

}

}

}

private static void objectToMap_field(Object arg, Field f,Map<String, String> params) {

try {

f.setAccessible(true); // 设置该属性是可以访问的

Object val = f.get(arg);// 得到此属性的值

if(val==null){

params.put(f.getName(), String.valueOf(val));

} else if (val.getClass().isPrimitive()

|| val.getClass().equals(String.class)

|| val.getClass().equals(Integer.class)

|| val.getClass().equals(Byte.class)

|| val.getClass().equals(Long.class)

|| val.getClass().equals(Double.class)

|| val.getClass().equals(Float.class)

|| val.getClass().equals(Character.class)

|| val.getClass().equals(Short.class)

|| val.getClass().equals(BigDecimal.class)

|| val.getClass().equals(BigInteger.class)

|| val.getClass().equals(Boolean.class)

|| Number.class

.isAssignableFrom(val.getClass())) {

params.put(f.getName(), String.valueOf(val));

} else if (val instanceof Date) {

Date val_date = (Date) val;

SimpleDateFormat sdf = new SimpleDateFormat(

"yyyyMMddHHmm");

params.put(f.getName(), sdf.format(val_date));

} else if (Collection.class.isAssignableFrom(val

.getClass())) {

Collection collection = (Collection<?>) val;

StringBuffer sb = new StringBuffer();

int j = 0;

for (Object s : collection) {

j++;

sb.append(String.valueOf(s));

if (j < collection.size()) {

sb.append(",");

}

}

params.put(f.getName(), sb.toString());

} else if (Object[].class.isInstance(val)) {

StringBuffer sb = new StringBuffer();

int j = 0;

for (Object s : (Object[]) val) {

j++;

sb.append(String.valueOf(s));

if (j < ((Object[]) val).length) {

sb.append(",");

}

}

params.put(f.getName(), sb.toString());

}

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* 冒泡排序

*

* @param strDate

*/

private static void Bubble_sort(String[] strDate) {

for (int i = 0; i < strDate.length; i++) {

for (int j = strDate.length - 1; j > i; j--) {

if (strDate[j].compareTo(strDate[j - 1]) < 0) {

String temp = strDate[j - 1];

strDate[j - 1] = strDate[j];

strDate[j] = temp;

}

}

}

}

}