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[Java教程]支付宝APP支付之Java后台生成签名具体步骤


 

  /**
*支付宝支付
* @param orderId 订单编号
* @param actualPay 实际支付金额
* @return
*/
private String getOrderInfoByAliPay(String orderId,float actualPay) {
   //回调页面
String ali_call_back_url = propertiesService.ALI_CALL_BACK_URL;
String seller_id = propertiesService.SELLER_ID;//商户编号
String[] parameters={
"service=\"mobile.securitypay.pay\"",//固定值(手机快捷支付)
"partner=\"2088421544444\"",//合作身份者ID(16位)
      "_input_charset=\"utf-8\"",
"notify_url=\""+ali_call_back_url+"\"",//通知地址
"out_trade_no=\""+orderId+"\"",//商户内部订单号
"subject=\"测试\"",//测试
"payment_type=\"1\"",//固定值
"seller_id=\""+seller_id+"\"",//账户邮箱
"total_fee=\""+"0.01"+"\"",//支付金额(元)

"body=\"订单说明\"",//订单说明
      "it_b_pay=\"30m\""(订单过期时间 30分钟过期无效)
};
String signOrderUrl = signAllString(parameters);
return signOrderUrl;
}
 
/**
* 支付宝签名
* @param array
* @return
*/
private String signAllString(String [] array){
StringBuffer sb = new StringBuffer("");
for (int i = 0; i < array.length; i++) {
if(i==(array.length-1)){
sb.append(array[i]);
}else{
sb.append(array[i]+"&");
}
}
System.out.println(sb.toString());
String sign = "";
try {
sign = URLEncoder.encode(RSA.sign(sb.toString(), AlipayConfig.private_key, "utf-8"), "utf-8");//private_key私钥
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
sb.append("&sign=\""+sign+"\"&");
sb.append("sign_type=\"RSA\"");
return sb.toString();
}
 

package com.alipay.sign;

import javax.crypto.Cipher;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
 


public class RSA{

public static final String SIGN_ALGORITHMS = "SHA1WithRSA";

/**
* RSA签名
* @param content 待签名数据
* @param privateKey 商户私钥
* @param input_charset 编码格式
* @return 签名值
*/
public static String sign(String content, String privateKey, String input_charset)
{
try
{
byte[] decode = Base64.decode(privateKey);
PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(decode );
KeyFactory keyf= KeyFactory.getInstance("RSA");
PrivateKey priKey= keyf.generatePrivate(priPKCS8);

java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);

signature.initSign(priKey);
signature.update( content.getBytes(input_charset) );

byte[] signed = signature.sign();

return Base64.encode(signed);
}
catch (Exception e)
{
e.printStackTrace();
}

return null;
}

/**
* RSA验签名检查
* @param content 待签名数据
* @param sign 签名值
* @param ali_public_key 支付宝公钥
* @param input_charset 编码格式
* @return 布尔值
*/
public static boolean verify(String content, String sign, String ali_public_key, String input_charset)
{
try
{
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
byte[] encodedKey = Base64.decode(ali_public_key);
PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));
java.security.Signature signature = java.security.Signature
.getInstance(SIGN_ALGORITHMS);

signature.initVerify(pubKey);
signature.update( content.getBytes(input_charset) );

boolean bverify = signature.verify( Base64.decode(sign) );
return bverify;

}
catch (Exception e)
{
e.printStackTrace();
}

return false;
}

/**
* 解密
* @param content 密文
* @param private_key 商户私钥
* @param input_charset 编码格式
* @return 解密后的字符串
*/
public static String decrypt(String content, String private_key, String input_charset) throws Exception {
PrivateKey prikey = getPrivateKey(private_key);

Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, prikey);

InputStream ins = new ByteArrayInputStream(Base64.decode(content));
ByteArrayOutputStream writer = new ByteArrayOutputStream();
//rsa解密的字节大小最多是128,将需要解密的内容,按128位拆开解密
byte[] buf = new byte[128];
int bufl;

while ((bufl = ins.read(buf)) != -1) {
byte[] block = null;

if (buf.length == bufl) {
block = buf;
} else {
block = new byte[bufl];
for (int i = 0; i < bufl; i++) {
block[i] = buf[i];
}
}

writer.write(cipher.doFinal(block));
}

return new String(writer.toByteArray(), input_charset);
}


/**
* 得到私钥
* @param key 密钥字符串(经过base64编码)
* @throws Exception
*/
public static PrivateKey getPrivateKey(String key) throws Exception {

byte[] keyBytes;

keyBytes = Base64.decode(key);

PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

PrivateKey privateKey = keyFactory.generatePrivate(keySpec);

return privateKey;
}
}
 
 
支付宝参数里面为什么要进行转义?主要是因为返回给移动的参数结果是springmvc进行返回的给移动端时,会认为"为结束,所以需要\"进行转义!