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JAVA实现微信APPV3支付保姆级教程

作者:扭曲的影子

微信实现支付功能与支付宝实现支付功能是相似的,这篇文章主要介绍了JAVA实现微信APPV3支付的相关资料,文中通过代码介绍的非常详细,需要的朋友可以参考下

前言

现在Java微信支付文章五花八门 看不懂 看的懵 掺杂业务逻辑不知名的返回封装 爆红一片 不妨看看这篇

 由于微信更新了0.4.9版本 部分使用微信支付会解析报错 原因是微信内置了Jackson2.13.xxx依赖会与springboot这个Jackson产生冲突 可能会无法升级依赖 因为升级了也会使用老版本依赖

解决方法需要把微信支付解析 验签等方法分离重写 目前没时间写文章

1.加入Maven依赖

        <!-- 微信支付V3 目前新版本-->
        <dependency>
            <groupId>com.github.wechatpay-apiv3</groupId>
            <artifactId>wechatpay-apache-httpclient</artifactId>
            <version>0.4.7</version>
        </dependency>

2.创建WxV3PayConfig.java配置类 

/**
 * implements WXPayConfig
 */
@Data
public class WxV3PayConfig {
    //平台证书序列号
    public static String mchSerialNo = "xxxxxxxxxxxxxx";
    //appID
    public static String APP_ID = "xxxxxxxxxxxxxx";
    //商户id
    public static String Mch_ID = "xxxxxxxxxxxxxx";
    // API V3密钥
    public static String apiV3Key = "xxxxxxxxxxxxxx";
    // 商户API V3私钥
    public static String privateKey = "
                    -----BEGIN PRIVATE KEY-----
        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                   -----END PRIVATE KEY-----";
    }

3.创建WXPaySignatureCertificateUtil.java 工具类

复制粘贴即可

/***
*
*包都在这
*
*
*
*/
import com.wechat.pay.contrib.apache.httpclient.WechatPayHttpClientBuilder;
import com.wechat.pay.contrib.apache.httpclient.auth.AutoUpdateCertificatesVerifier;
import com.wechat.pay.contrib.apache.httpclient.auth.PrivateKeySigner;
import com.wechat.pay.contrib.apache.httpclient.auth.WechatPay2Credentials;
import com.wechat.pay.contrib.apache.httpclient.auth.WechatPay2Validator;
import com.wechat.pay.contrib.apache.httpclient.util.PemUtil;
import lombok.SneakyThrows;
import org.apache.http.impl.client.CloseableHttpClient;
import javax.servlet.http.HttpServletRequest;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.*;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Base64;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class WXPaySignatureCertificateUtil {
 /**
     * 证书验证
     * 自动更新的签名验证器
     */
    public static CloseableHttpClient checkSign() throws IOException {
        //验签
        CloseableHttpClient httpClient = null;
        PrivateKey merchantPrivateKey = PemUtil.loadPrivateKey(new ByteArrayInputStream(WxV3PayConfig.privateKey.getBytes("utf-8")));
        httpClient = WechatPayHttpClientBuilder.create()
                .withMerchant(WxV3PayConfig.Mch_ID, WxV3PayConfig.mchSerialNo, merchantPrivateKey)
                .withValidator(new WechatPay2Validator(WXPaySignatureCertificateUtil.getVerifier(WxV3PayConfig.mchSerialNo)))
                .build();

        return httpClient;
    }

    /**
     * 保存微信平台证书
     */
    private static final ConcurrentHashMap<String, AutoUpdateCertificatesVerifier> verifierMap = new ConcurrentHashMap<>();

    /**
     * 功能描述:获取平台证书,自动更新
     * 注意:这个方法内置了平台证书的获取和返回值解密
     */
    static AutoUpdateCertificatesVerifier getVerifier(String mchSerialNo) {
        AutoUpdateCertificatesVerifier verifier = null;
        if (verifierMap.isEmpty() || !verifierMap.containsKey(mchSerialNo)) {
            verifierMap.clear();
            try {
                 //传入证书
                 PrivateKey privateKey = getPrivateKey();
                //刷新
                PrivateKeySigner signer = new PrivateKeySigner(mchSerialNo, privateKey);
                WechatPay2Credentials credentials = new WechatPay2Credentials(WxV3PayConfig.Mch_ID, signer);
                verifier = new AutoUpdateCertificatesVerifier(credentials
                        , WxV3PayConfig.apiV3Key.getBytes("utf-8"));
                verifierMap.put(verifier.getValidCertificate().getSerialNumber()+"", verifier);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        } else {
            verifier = verifierMap.get(mchSerialNo);
        }
        return verifier;
    }

    /**
     * 生成带签名支付信息
     *
     * @param timestamp 时间戳
     * @param nonceStr  随机数
     * @param prepayId  预付单
     * @return 支付信息
     * @throws Exception
     */
    public static String appPaySign(String timestamp, String nonceStr, String prepayId) throws Exception {
        //上传私钥
        PrivateKey privateKey = getPrivateKey();
        String signatureStr = Stream.of(WxV3PayConfig.APP_ID, timestamp, nonceStr, prepayId)
                .collect(Collectors.joining("\n", "", "\n"));
        Signature sign = Signature.getInstance("SHA256withRSA");
        sign.initSign(privateKey);
        sign.update(signatureStr.getBytes(StandardCharsets.UTF_8));
        return Base64.getEncoder().encodeToString(sign.sign());
    }

    /**
     * 生成带签名支付信息
     *
     * @param timestamp 时间戳
     * @param nonceStr  随机数
     * @param prepayId  预付单
     * @return 支付信息
     * @throws Exception
     */
    public static String jsApiPaySign(String timestamp, String nonceStr, String prepayId) throws Exception {
        //上传私钥
        PrivateKey privateKey = getPrivateKey();
        String signatureStr = Stream.of(WxV3PayConfig.APP_ID, timestamp, nonceStr, "prepay_id="+prepayId)
                .collect(Collectors.joining("\n", "", "\n"));
        Signature sign = Signature.getInstance("SHA256withRSA");
        sign.initSign(privateKey);
        sign.update(signatureStr.getBytes(StandardCharsets.UTF_8));
        return Base64.getEncoder().encodeToString(sign.sign());
    }

    /**
     * 获取私钥。
     * 证书路径 本地使用如: D:\\微信平台证书工具\\7.9\\apiclient_key.pem
     * 证书路径 线上使用如: /usr/apiclient_key.pem
     * String filename 私钥文件路径  (required)
     * @return 私钥对象
     */
    public static PrivateKey getPrivateKey() throws IOException {
        String content = new String(Files.readAllBytes(Paths.get("D:\\微信平台证书工具\\7.9\\apiclient_key.pem")), "utf-8");
        try {
            String privateKey = content.replace("-----BEGIN PRIVATE KEY-----", "")
                    .replace("-----END PRIVATE KEY-----", "")
                    .replaceAll("\\s+", "");

            KeyFactory kf = KeyFactory.getInstance("RSA");
            return kf.generatePrivate(
                    new PKCS8EncodedKeySpec(Base64.getDecoder().decode(privateKey)));
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("当前Java环境不支持RSA", e);
        } catch (InvalidKeySpecException e) {
            throw new RuntimeException("无效的密钥格式");
        }
    }

    /**
     * 功能描述: 验证签名
     * 注意:使用微信支付平台公钥验签
     * Wechatpay-Signature 微信返签名
     * Wechatpay-Serial 微信平台证书序列号
     *
     * @return java.lang.String
     * @author 影子
     */
    @SneakyThrows
    public static boolean verifySign(HttpServletRequest request,String body) {
        boolean verify = false;
        try {
            String wechatPaySignature = request.getHeader("Wechatpay-Signature");
            String wechatPayTimestamp = request.getHeader("Wechatpay-Timestamp");
            String wechatPayNonce = request.getHeader("Wechatpay-Nonce");
            String wechatPaySerial = request.getHeader("Wechatpay-Serial");
            //组装签名串
            String signStr = Stream.of(wechatPayTimestamp, wechatPayNonce, body)
                    .collect(Collectors.joining("\n", "", "\n"));
            //获取平台证书
            AutoUpdateCertificatesVerifier verifier = getVerifier(wechatPaySerial);
            //获取失败 验证失败
            if (verifier != null) {
                Signature signature = Signature.getInstance("SHA256withRSA");
                signature.initVerify(verifier.getValidCertificate());
                //放入签名串
                signature.update(signStr.getBytes(StandardCharsets.UTF_8));
                verify = signature.verify(Base64.getDecoder().decode(wechatPaySignature.getBytes()));
            }
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return verify;
    }
}

创建WXPayConstants.java类

/**
 * 常量
 */
public class WXPayConstants {
    public static final String DOMAIN_API = "https://api.mch.weixin.qq.com/v3";
    //app下单
    public static final String PAY_TRANSACTIONS_APP = "/pay/transactions/app";
    //微信支付回调
    public static final String WECHAT_PAY_NOTIFY_URL =         
    "https://xxx.xxxx.com/deal/api/appPayment/weChatPayNotify";
    //申请退款
    public static final String REFUND_DOMESTIC_REFUNDS      = "/refund/domestic/refunds";
    //微信退款回调
    public static final String WECHAT_REFUNDS_NOTIFY_URL = "https://xxx.xxxx.com/api/appPayment/weChatPayRefundsNotify";
    //关闭订单
    public static final String PAY_TRANSACTIONS_OUT_TRADE_NO   = "/pay/transactions/out-trade-no/{}/close";
}

这里以APP支付和退款为例

创建WechatPaymentService.java

/**
 * @author 影子
 */
public interface WechatPaymentService
{
    /**
     * 微信商品支付
     * @param payParam
     * @return
     */
    public Map<String, Object>weChatDoUnifiedOrder() throws Exception;
    /**
     * 微信支付回调通知
     * @param
     * @return
     */
    public Map<String, Object> weChatNotificationHandler(HttpServletRequest request, HttpServletResponse response);
  /**
     *微信关闭订单
     * @param outTradeNo
     * @return
     */
    public Map<String, Object> closeOrder(String outTradeNo);
    /**
     * 申请退款
     * @param
     * @return
     */
    public Map<String, Object> weChatPayRefundsNotify(HttpServletRequest request);
    /**
     * 微信退款
     * @param outTradeNo 订单号
     * @return
     */
    public Map<String, Object> weChatRefunds(String outTradeNo);
}

创建WeChatPaymentServiceImpl.java

/*
*
*改了七八遍 照顾找包困难的朋友吧
*
*/
import com.alibaba.fastjson.JSONObject;
import com.alipay.api.internal.util.file.ByteArrayOutputStream;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.github.wxpay.sdk.WXPayUtil;
import com.wechat.pay.contrib.apache.httpclient.notification.Notification;
import com.wechat.pay.contrib.apache.httpclient.notification.NotificationHandler;
import com.wechat.pay.contrib.apache.httpclient.notification.NotificationRequest;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.util.EntityUtils;

public class WeChatPaymentServiceImpl implements WechatPaymentService {

 /**
     * V3微信支付统一下单
     *
     * @param payParam
     * @return
     * 
     */
    @Override
    public Map<String, Object>weChatDoUnifiedOrder() {
        Map<String,Object> map =new HashMap<>();
        //支付总金额
        BigDecimal totalPrice = BigDecimal.ZERO;
        totalPrice = totalPrice.add(BigDecimal.valueOf(600));
        //转换金额保留两位小数点
        Integer money=new BigDecimal(String.valueOf(totalPrice)).movePointRight(2).intValue();
            try {
                //验证证书
                CloseableHttpClient httpClient = WXPaySignatureCertificateUtil.checkSign();
                //app下单
                HttpPost httpPost = new HttpPost(WXPayConstants.DOMAIN_API+WXPayConstants.PAY_TRANSACTIONS_APP);
                httpPost.addHeader("Accept", "application/json");
                httpPost.addHeader("Content-type", "application/json; charset=utf-8");
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                ObjectMapper objectMapper = new ObjectMapper();
                ObjectNode rootNode = objectMapper.createObjectNode();
                rootNode.put("mchid", "商户id")
                        .put("appid", "APPID")
                        .put("description","描述")
                        .put("notify_url", WXPayConstants.WECHAT_PAY_NOTIFY_URL)//回调
                        .put("out_trade_no", "订单号");
                rootNode.putObject("amount")
                        .put("total","总金额");
                objectMapper.writeValue(bos, rootNode);
                httpPost.setEntity(new StringEntity(bos.toString("UTF-8"), "UTF-8"));
                //完成签名并执行请求
                CloseableHttpResponse response = httpClient.execute(httpPost);
                //获取返回状态
                int statusCode = response.getStatusLine().getStatusCode();
                if (statusCode == 200) { //处理成功
                    String result = EntityUtils.toString(response.getEntity(), "UTF-8");
                    JSONObject object = JSONObject.parseObject(result);
                    //获取预付单
                    String prepayId = object.getString("prepay_id");
                    //生成签名
                    Long timestamp = System.currentTimeMillis() / 1000;
                    //随机字符串 这个是微信支付maven自带的 也可以用其它的
                    String nonceStr = WXPayUtil.generateNonceStr();
                    //生成带签名支付信息
                    String paySign = WXPaySignatureCertificateUtil.appPaySign(String.valueOf(timestamp), nonceStr, prepayId);
                    Map<String, String> param = new HashMap<>();
                    param.put("appid", WxV3PayConfig.APP_ID);
                    param.put("partnerid", WxV3PayConfig.Mch_ID);
                    param.put("prepayid", prepayId);
                    param.put("package", "Sign=WXPay");
                    param.put("noncestr", nonceStr);
                    param.put("timestamp", String.valueOf(timestamp));
                    param.put("sign", paySign);
                    map.put("code",200);
                    map.put("message", "下单成功");
                    map.put("data", param);
                    return map;
                }
                    map.put("code",200);
                    map.put("message", "下单失败");
                    map.put("data", response);
                    return map;
            } catch (Exception e) {
                e.printStackTrace();
            }
    }


    /**
     * 微信支付回调通知
     * @return
     */
    @Override
    public Map<String, Object> weChatNotificationHandler(HttpServletRequest request, HttpServletResponse response){
        Map<String,Object> map = new HashMap<>();
        try {
            BufferedReader br = request.getReader();
            String str = null;
            StringBuilder sb = new StringBuilder();
            while ((str = br.readLine())!=null) {
                sb.append(str);
            }
            // 构建request,传入必要参数
            NotificationRequest requests = new NotificationRequest.Builder()
                    .withSerialNumber(request.getHeader("Wechatpay-Serial"))
                    .withNonce(request.getHeader("Wechatpay-Nonce"))
                    .withTimestamp(request.getHeader("Wechatpay-Timestamp"))
                    .withSignature(request.getHeader("Wechatpay-Signature"))
                    .withBody(String.valueOf(sb))
                    .build();
            //验签
            NotificationHandler handler = new NotificationHandler(WXPaySignatureCertificateUtil.getVerifier(WxV3PayConfig.mchSerialNo), WxV3PayConfig.apiV3Key.getBytes(StandardCharsets.UTF_8));
            //解析请求体
            Notification notification = handler.parse(requests);
            String decryptData = notification.getDecryptData();
            //解析
            JSONObject jsonObject = JSONObject.parseObject(decryptData);
            //支付状态交易状态,枚举值: SUCCESS:支付成功 REFUND:转入退款 NOTPAY:未支付 CLOSED:已关闭 REVOKED:已撤销(付款码支付)
            // USERPAYING:用户支付中(付款码支付) PAYERROR:支付失败(其他原因,如银行返回失败)
            String trade_state = String.valueOf(jsonObject.get("trade_state"));
            if (trade_state.equals("SUCCESS")) {
                //订单号
                String orderNumber = String.valueOf(jsonObject.get("out_trade_no"));
                //微信支付微信生成的订单号
                String transactionId = String.valueOf(jsonObject.get("transaction_id"));
                //省略查询订单
                //此处处理业务
                    map.put("code","SUCCESS");
                    map.put("message","成功");
                    //消息推送成功
                    return map;
                }
                map.put("code","RESOURCE_NOT_EXISTS");
                map.put("message", "订单不存在");
                return map;
            }catch (Exception e) {
            e.printStackTrace();
        }
        map.put("code","FAIL");
        map.put("message", "失败");
        return map;
    }
/**
     * 关闭订单
     * @param outTradeNo 订单号
     * @return
     */
    @Override
    public Map<String, Object> closeOrder(String outTradeNo) {
        Map<String,Object> map = new HashMap<>();
        try {
            //验证证书
                CloseableHttpClient httpClient = WXPaySignatureCertificateUtil.checkSign();
            //关闭订单
            String url = StrFormatter.format(WXPayConstants.DOMAIN_API+WXPayConstants.PAY_TRANSACTIONS_OUT_TRADE_NO, outTradeNo);
            HttpPost httpPost = new HttpPost(url);
            httpPost.addHeader("Accept", "application/json");
            httpPost.addHeader("Content-type", "application/json; charset=utf-8");
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            //2.添加商户id
            ObjectMapper objectMapper = new ObjectMapper();
            ObjectNode rootNode = objectMapper.createObjectNode();
            rootNode.put("mchid", WxV3PayConfig.Mch_ID);
            objectMapper.writeValue(bos, rootNode);
            //3.调起微信关单接口
            httpPost.setEntity(new StringEntity(bos.toString("UTF-8"), "UTF-8"));
            //完成签名并执行请求
            CloseableHttpResponse response = httpClient.execute(httpPost);
            System.out.println(response.getStatusLine().getStatusCode() == 204);
            //无数据(Http状态码为204) 微信返回结果无数据 状态码为204 成功
            if (response.getStatusLine().getStatusCode() == 204) {
                
                //code 退款码请前往微信支付文档查询
                map.put("code",200);
                map.put("message", "关闭订单成功!");
                return map;
            }
        } catch (Exception e) {
            log.error("关单失败:" + outTradeNo + e);
        }
        return null;
    }

 /**
     * 微信退款
     * @param outTradeNo 订单号
     * @return
     */
    @Override
    public Map<String, Object> weChatRefunds(String outTradeNo) {
        Map<String,Object> map = new HashMap<>();
        //退款总金额
        BigDecimal totalPrice = BigDecimal.ZERO;
        totalPrice = totalPrice.add(BigDecimal.valueOf(600));
        //转换金额
        Integer money=new BigDecimal(String.valueOf(totalPrice)).movePointRight(2).intValue();
        
        try {
            //验证证书
             CloseableHttpClient httpClient = WXPaySignatureCertificateUtil.checkSign();
            //申请退款接口
            HttpPost httpPost = new HttpPost(WXPayConstants.DOMAIN_API+WXPayConstants.REFUND_DOMESTIC_REFUNDS);
            httpPost.addHeader("Accept", "application/json");
            httpPost.addHeader("Content-type","application/json; charset=utf-8");
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectMapper objectMapper = new ObjectMapper();
            ObjectNode rootNode = objectMapper.createObjectNode();
            //微信支付订单号
            rootNode.put("transaction_id", "微信支付订单号")
                    //退款订单号
                    .put("out_refund_no","生成退款订单号")
                    .put("notify_url","退款回调");
                    //退款金额
            rootNode.putObject("amount")
                    .put("refund", "100.00")
                    //原订单金额
                    .put("total", "100.00")
                    .put("currency","CNY");
            objectMapper.writeValue(bos, rootNode);
            httpPost.setEntity(new StringEntity(bos.toString("UTF-8"), "UTF-8"));
            CloseableHttpResponse response = httpClient.execute(httpPost);
            //退款成功返回消息
            String bodyAsString = EntityUtils.toString(response.getEntity());
            JSONObject jsonObject = JSONObject.parseObject(bodyAsString);
            if (jsonObject.get("status").equals("SUCCESS") || jsonObject.get("status").equals("PROCESSING")) {
                //code返回
                map.put("code",200);
                map.put("message", "退款成功");
                return map;
            }
        }catch (Exception e) {
            e.printStackTrace();
        }
        map.put("code",500);
        map.put("message", "申请退款失败!");
        map.put("data", jsonObject);
        return map;
    }

    /**
     * 申请退款回调
     * @param request
     * @return
     */
    @Override
    public Map<String,Object> weChatPayRefundsNotify(HttpServletRequest request) {
        Map<String,Object> map = new HashMap<>();
        try {
            BufferedReader br = request.getReader();
            String str = null;
            StringBuilder sb = new StringBuilder();
            while ((str = br.readLine())!=null) {
                sb.append(str);
            }
            // 构建request,传入必要参数
            NotificationRequest requests = new NotificationRequest.Builder()
                    .withSerialNumber(request.getHeader("Wechatpay-Serial"))
                    .withNonce(request.getHeader("Wechatpay-Nonce"))
                    .withTimestamp(request.getHeader("Wechatpay-Timestamp"))
                    .withSignature(request.getHeader("Wechatpay-Signature"))
                    .withBody(String.valueOf(sb))
                    .build();
            //验签
            NotificationHandler handler = new NotificationHandler(WXPaySignatureCertificateUtil.getVerifier(WxV3PayConfig.mchSerialNo), WxV3PayConfig.apiV3Key.getBytes(StandardCharsets.UTF_8));
            //解析请求体
            Notification notification = handler.parse(requests);
            String decryptData = notification.getDecryptData();
            //解析
            JSONObject jsonObject = JSONObject.parseObject(decryptData);
            String refund_status = String.valueOf(jsonObject.get("refund_status"));
            if (refund_status.equals("SUCCESS")) {
                //订单号
                String orderNumber = String.valueOf(jsonObject.get("out_trade_no"));
                //微信支付订单号
                String transactionId = String.valueOf(jsonObject.get("transaction_id"));

                //这里是处理业务逻辑
                
                //code 退款码请前往微信支付文档查询
                map.put("code","RESOURCE_NOT_EXISTS");
                map.put("message", "订单不存在");
                return map;
            }
        }catch (Exception e) {
            e.printStackTrace();
        }
        map.put("code","USER_ACCOUNT_ABNORMAL");
        map.put("message", "退款请求失败");
        return map;    }
}

代码可复制粘贴使用 无业务逻辑代码 支付代码简洁

如果更换支付类型如:APP、二维码支付、扫码支付、JSAPI支付

请看以下示例二维码支付代码

 HttpPost httpPost = new HttpPost("https://api.mch.weixin.qq.com/v3"+"/pay/transactions/native");

 HttpPost httpPost = new HttpPost("这里更换")

整体不变只需要微信返回正确状态码内处理即可 如以下返回为 二维码支付参数

            //完成签名并执行请求
                CloseableHttpResponse response = httpClient.execute(httpPost);
                //获取返回状态
                int statusCode = response.getStatusLine().getStatusCode();
           if (statusCode == 200) { //处理成功
              String result = EntityUtils.toString(response.getEntity(), "UTF-8");
              JSONObject object = JSONObject.parseObject(result);
                 map.put("code",200);
                 map.put("message", "下单成功");
                 map.put("data", object);
                 return map;
           }
                 map.put("code",500);
                 map.put("message", "下单失败");
                 map.put("data", response);
                 return map;

修改方式 根据官方文档返回参数类型为准

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