一、MD5加密
封裝Md5
public class Md5 {
//十六進制下數字到字符的映射數組
private static final char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F' };
/**把inputString加密*/
public static String md5Str(String inputStr){
return encrypt(inputStr);
}
public static String encrypt(String inputStr) {
byte[] inStrBytes = inputStr.getBytes();
try {
//創建具有指定算法名稱的信息摘要
MessageDigest MD = MessageDigest.getInstance("MD5");
//使用指定的字節數組對摘要進行最後更新,然後完成摘要計算
MD.update(inStrBytes);
byte[] mdByte = MD.digest();
char[] str = new char[mdByte.length * 2];
int k = 0;
for(int i=0;i<mdByte.length;i++) {
byte temp = mdByte[i];
str[k++] = hexDigits[temp >>> 4 & 0xf];
str[k++] = hexDigits[temp & 0xf];
}
return new String(str);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return null;
}
}
二、一般 請求參數+secret 進行加密,故再次進行封裝,並返回【請求參數+secret 】MD5加密後的字符串(32位)
複製代碼
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.TreeMap;
public class SJS {
//entrance
/**
* 對請求參數進行加密
* @param requestParams 請求參數
* @param secret 根祕鑰
* @return
* @throws Exception
*/
public String getSJSInfo(TreeMap<String, Object> requestParams, String secret) throws Exception {
return sjsSi(buildParamStr(requestParams), secret);
}
//調用MD5封裝方法進行加密【入參+secret】
private String sjsSi(String signStr, String secret)
throws NoSuchAlgorithmException, UnsupportedEncodingException, InvalidKeyException {
return Md5.md5Str(signStr+secret);
}
//將入參(格式key=value)與&進行拼接,並返回
public String buildParamStr(TreeMap<String, Object> requestParams) {
StringBuilder retStr = new StringBuilder();
for(String key: requestParams.keySet()) {
if (retStr.length()==0) {
retStr.append(key+"="+String.valueOf(requestParams.get(key)));
} else {
retStr.append("&"+key+"="+String.valueOf(requestParams.get(key)));
}
}
return retStr.toString();
}
}