/**
* 测试用例
*/
// 密钥需要注意的是生成密钥时选择格式：pkcs8(java适用)
static string privatekey="miiccwibadanbgkqhkig9w0baqefaascal0wggjzageaaogbaj7udweirnol3oi/cu2avbvaboph7qowfoamfvtbasaw9yd3qa15wuvsazkidp/xj1clt sgcfxoramegt2fgfl4m5a9ingccqrohwljr22dgt2txjb4ne8llaop8quoftg1ij1101li7 6lfgk8shxb2tfmxs7x2h5jihuc8bnzagmbaaecf2w/toeddz6yos5nllkileorygekesw5wjtommibjugtc7du8v4wya7dze0jftr35nvvtd8o6dzi79e5chh5fuwkxqeldmqetzffplpgyaaevxdvybo3z6mckia1ptnlfj47jtdpabc2al6qfzfjforo uft/aie1pwolf/garecqqd2rlyhbirzfff9bnuawag3rne5i7ef7t64dbzo9frze660a8xk8yxzi7kmviq9aiy6lgsv1ake2w97ccbgntbrakeapnwv7ywqlrm8ybo3viflzsbtuk3rjicwjxzjzklhr91xvwqdlx50l7kt0e1sncuvjw3xr0ygfpnaw4ve9fqmswjaewyn 9tifqscaxuuodx8yyodcwu4c6nox/6fkjv6kkscvzv7t70wxvze0jh8uye2jycywg0xl4zfqgyyb2ygiqjakxltyl8l6b1pl0eqfpnkdpcw0c/nkzq0djeiznxp8eqfavbtpm5hstjikktry4whyl5knwhbahbytq8nijwzyqjaswfwm30dj5yavq3zmyky0aeyqujptdw4m3ujzwb2hynu/kfpngj oeo2a7xaferfo177ruvcqiwpal4y4pfvdw==";
// 加密算法rsa
public static final string key_algorithm = "rsa";//使用默认的算法
// rsa最大解密密文大小; 需要注意，如果用的是2048位密钥，这里需要改为256; 1024密钥是 128
private static final int max_decrypt_block = 256/2;
public static void main(string[] args) throws exception {
    test();
}
// 服务端解密测试
public static void test() throws exception {
    string source="zpc/dtrlduqvqgnolnunn76eb/mkyu hejmrpakrehqnekqwfzzwoxfctd0x8spqdwpsaapqrkn5smuxnc76ma6ii/2tusrrowpxyeef wwcsggbo93gublila3jvou6oiuc5arouicgma5ze612ayrmpvb235yvmxui4e7wy2z7zf1679fyew04m0hfk4eus8sat8dim606qhe/iabrreb3pq6vfi8ku53b35lxb4ipu0ijl90asj1dya6slnbbgk3ut8wbmgazbzqqneshx wivvc6fxw9ynjisdivogi0db1pphkz4cs8woet/4pjzrmb0ushfb9sggja4wo2ig==";
    byte[] encrypteddata = base64.getdecoder().decode(source.getbytes());
    system.out.println("—— 私钥解密 ——");
    byte[] decrypteddata = decrypt_privatekey(encrypteddata, privatekey); // 调用解密方法
    string str = new string(decrypteddata);
    system.out.println("解密后内容:  "  str);
}
/**
 *
 * 私钥解密
 * @param encrypteddata      已加密数据
 * @param privatekey    私钥(base64编码)
 * @return
 * @throws exception
 */
public static byte[] decrypt_privatekey(byte[] encrypteddata, string privatekey) throws exception {
    byte[] keybytes = base64.getdecoder().decode(privatekey.getbytes());//使用jdk的util包下的base64实现解码
    system.out.println("base64解码："keybytes);
    pkcs8encodedkeyspec pkcs8keyspec = new pkcs8encodedkeyspec(keybytes);
    keyfactory keyfactory = keyfactory.getinstance(key_algorithm);//使用keyfactory工厂处理私钥
    key privatek = keyfactory.generateprivate(pkcs8keyspec);
    cipher cipher = cipher.getinstance(keyfactory.getalgorithm());//使用cipher.getinstance解密
    cipher.init(cipher.decrypt_mode, privatek);
    int inputlen = encrypteddata.length;
    bytearrayoutputstream out = new bytearrayoutputstream();
    int offset = 0;
    byte[] cache;
    int i = 0;        // 对数据分段解密
    while (inputlen - offset > 0) {
        if (inputlen - offset > max_decrypt_block) {
            cache = cipher.dofinal(encrypteddata, offset, max_decrypt_block);
        } else {
            cache = cipher.dofinal(encrypteddata, offset, inputlen - offset);
        }
        out.write(cache, 0, cache.length);
        i;
        offset = i * max_decrypt_block;
    }
    byte[] decrypteddata = out.tobytearray();
    out.close();
    return decrypteddata;
}

{
  "text": "z0uz1hvcnntfkfjcryfsvsvrseva2yj5odzmj6ml7vabngcgs4z21zbdnbub1t7vb3n4sfv9t7okargpkykvvw47oo7y2m4zsuwp1gtbnhqprxzijdnofgwxyvax5szxdupmvcz65yolhamm8brudf h9q8h9ts8upjyzyetjv4="
}

{
  "error": 10,
  "errormessage": "h5rsa params (text and key) must not be empty"
}