Java调用第三方接口封装实现
目录
- 介绍
- 一、借助feign实现调用
- 二、自己封装请求类
- 三、调用第三方生成token,可以使用策略类实现
- 总结
介绍
在Java项目中,会遇到很多调用第三方接口的地方,比如接入微信,其他公司的系统,需要传token或者签名。由于接入调用接口很多,每个接口内部都需要手动设置token或者其他数据,这就显得很麻烦。而且发送http请求还需要自己创建request对象。下面介绍2中封装方式,
一、利用feign功能封装请求,所有接口和服务之间调用是一样的,只需要执行后面的url,参数类,请求方式等。内部需要传输的token信息,在自定的拦截器中设置,自定义的拦截器需要实现RequestInterceptor接口。在这里面设置公共的请求参数。比较推荐的。
二、自己封装一个通用的请求类,里面自己创建Request对象,发送完http请求之后拿到返回的json对象在封装返回类,借助于ObjectMapper类。
一、借助feign实现调用
写一个feign的接口调用类,因为调用服务和接收服务不在一个注册中心,所以需要指定url,并实现拦截器
自定义的feign接口
import org.springframework.cloud.openfeign.FeignClient; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; @FeignClient( url = "${e-sign.apiHost}", // 这个值在配置文件中配置好 value = "authFeign" // 这个是自定义的服务名称,没有用 ) @RequestMapping( headers = {"X-Tsign-Open-Auth-Mode=Signature"} // 设置请求的header ) public interface EAuthFeign { // 写封装的参数和请求路径 @PostMapping({"/v3/oauth2/index"}) EResponse<String> applyAuth(@RequestBody EApplyAuthDTO params); }
配置文件内容
e-sign: projectId: 111111 projectSecret: fasdfads apiHost: https://ss.sign.cn callbackHost: https://call.baidu.com redirectHost: https://web.baidu.com
自定义拦截器,这个是feign的拦截器,只需要标记被扫描到就行,会自动加载。写了这个类后,这个类所在的项目所有的feign都会被这个拦截器控制
import common.exception.E; import esign.config.ESignConfig; import feign.RequestInterceptor; import feign.RequestTemplate; import java.net.URLDecoder; import java.nio.charset.StandardCharsets; import java.security.InvalidKeyException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.Collection; import java.util.Map; import javax.crypto.MAC; import javax.crypto.spec.SecretKeySpec; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import sun.misc.B编程ASE64Encoder; @Component public class EAuthFeignRequestInterceptor implements RequestInterceptor { private static final Logger log = LoggerFactory.getLogger(EAuthFeignRequestInterceptor.class); @Autowired private ESignConfig eSignConfig; private static final BASE64Encoder encodeBase64 = new BASE64Encphpoder(); public EAuthFeignRequestInterceptor() { } public void apply(RequestTemplate template) { String host = this.eSignConfig.getApiHost(); String url = template.url(); String target = template.feignTarget().url(); boolean b = target.equals(host); // 这个判断就是为了防止所有的feign都走这个拦截器,限制只有第三方接口才能进入下面的逻辑 if (b) { template.header("X-Tsign-Open-App-Id", new String[]{this.eSignConfig.getProjectId()}); Map<String, Collection<String>> headers = template.headers(); Collection<String> authMode = (Collection)headers.get("X-Tsign-Open-Auth-Mode"); boolean isSign = authMode != null && authMode.contains("Signature"); if (isSign) { template.header("X-Tsign-Open-Ca-Timestamp", new String[]{String.valueOf(System.currentTimeMillis())}); template.header("Accept", new String[]{"*/*"}); template.header("Content-Type", new String[]{"application/json;charset=UTF-8"}); try { this.setMd5AndSig编程客栈nature(template); } catch (Exception var10) { log.error("发送请求失败, url:{}, params:{}", url, new String(template.body())); throw new E("发送请求失败"); } } else { template.header("X-Tsign-Open-Authorization-Version", new String[]{"v2"}); } log.info("发送请求, url:{}, params:{}", url, template.body() == null ? "" : new String(template.body())); } } public void setMd5AndSignature(RequestTemplate template) { byte[] body = template.body(); String url = template.url(); String method = template.method(); String contentMD5 = doContentMD5(body); if ("GET".equals(method) || "DELETE".equals(method)) { contentMD5 = ""; url = URLDecoder.decode(url); } String message = appendSignDataString(method, "*/*", contentMD5, "application/json;charset=UTF-8", "", "", url); log.info("接口,url:{}, 签名字符串:{}", url, message); String reqSignature = DOSignatureBase64(message, this.eSignConfig.getProjectSecret()); template.header("Content-MD5", new String[]{contentMD5}); template.header("X-Tsign-Open-Ca-Signature", new String[]{reqSignature}); } private static String doContentMD5(byte[] body) { if (body == null) { return ""; } else { byte[] md5Bytes = null; MessageDigest md5 = null; String contentMD5 = null; try { md5 = MessageDigest.getInstance("MD5"); md5.update(body); byte[] md5Bytes = md5.digest(); contentMD5 = encodeBase64.encode(md5Bytes); return contentMD5; } catch (NoSuchAlgorithmException var5) { log.error("不支持此算法", var5); throw new E("不支持此算法"); } } } private static String doSignatureBase64(String message, String secret) { String algorithm = "HmacSHA256"; String digestBase64 = null; try { Mac hmacSha256 = Mac.getInstance(algorithm); byte[] keyBytes = secret.getBytes(StandardCharsets.UTF_8); byte[] messageBytes = message.getBytes(StandardCharsets.UTF_8); hmacSha256.init(new SecretKeySpec(keyBytes, 0, keyBytes.length, algorithm)); byte[] digestBytes = hmacSha256.doFinal(messageBytes); digestBase64 = encodeBase64.encode(digestBytes); return digestBase64; } catch (NoSuchAlgorithmException var8) { log.error("不支持此算法", var8); throw new E("不支持此算法"); } catch (InvalidKeyException var9) { log.error("无效的密钥规范", var9); throw new E("无效的密钥规范"); } } private static开发者_Go学习 String appendSignDataString(String method, String accept, String contentMD5, String contentType, String date, String headers, String url) { StringBuilder sb = new StringBuilder(); sb.append(method).append("\n").append(accept).append("\n").append(contentMD5).append("\n").append(编程contentType).append("\n").append(date).append("\n"); if ("".equals(headers)) { sb.append(headers).append(url); } else { sb.append(headers).append("\n").append(url); } return new String(sb); } }
配置类
@Configuration @ConfigurationProperties( prefix = "e-sign" ) public class ESignConfig { private static final Logger log = LoggerFactory.getLogger(ESignConfig.class); private String projectId; private String projectSecret; private String apiHost; private String callbackHost; private String redirectHost; }
上边几个类就可以封装对外请求了。自己服务根据要求可以另外处理
二、自己封装请求类
通用请求返回结果类
package com.service; import com.alibaba.fastjson.JSONObject; import com.common.dto.coop.HttpDTO; import com.common.vo.coop.ThirdResultVO; import com.cooperation.generator.ThirdTokenGenerator; import com.cooperation.template.TokenTemplate; import lombok.extern.slf4j.Slf4j; import okhttp3.*; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.util.Assert; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.util.Objects; import java.util.concurrent.TimeUnit; /** * 基于okhttp的请求客户端的service * * @author aaa 2022-04-28 */ @Slf4j @Service public class HttpService2 { @Autowired private TokenTemplate tokenTemplate; /** * 获取接口调用返回值 * * @param param 请求参数 * @author aaa 2022-04-28 */ public ThirdResultVO getInterfaceResult(HttpDTO param) { // 参数转换成json JSONObject json = Objects.isNull(param.getObj()) ? new JSONObject() : JSONObject.parseobject(JSONObject.toJSONString(param.getObj())); // 如果需要token,将token放在参数中 if (param.getNeedToken()) { String token = tokenTemplate.getToken(new ThirdTokenGenerator()); json.put("token", token); } // 发起请求,获得响应 Response response = doRequest(param.getUrl(), json); // 处理返回值 ThirdResultVO ThirdResult = handleReturn(response); // 如果为null,响应有问题,不能转成返回值类型 Assert.notNull(ThirdResult, "接口调用异常"); return ThirdResult; } /** * 处理返回值 * * @param response 请求响应 * @author aaa 2022-04-28 */ private ThirdResultVO handleReturn(Response response) { // 如果响应为空,返回null if (Objects.isNull(response)) { return null; } try { // 如果响应体为空,返回null if (Objects.isNull(response.body())) { return null; } // 响应体的字节数组 byte[] bytes = response.body().bytes(); log.info("调用接口返回数据--:{}", new String(bytes)); // 转换成返回值类型 return JSONObject.parseObject(bytes, ThirdResultVO.class); } catch (Exception e) { log.info("处理返回值失败:{}", e.getMessage(), e); } return null; } /** * 发送请求 * * @param url 请求地址 * @param jsonObject 参数DTO * @author aaa 2022-04-28 */ private Response doRequest(String url, JSONObject jsonObject) { // 获得表单请求对象 Request formRequest = getFormRequest(url, jsonObject); // 调用接口 请求入参 log.info("调用接口请求入参--:url:{} , jsonObject :{}",url, JSONObject.toJSONString(jsonObject)); // 获得okhttp请求工具 OkHttpClient requestClient = getRequestClient(); // 获得请求调用对象 Call call = requestClient.newCall(formRequest); // 发起请求,获得响应 Response execute = null; try { execute = call.execute(); } catch (IOException e) { log.info("调用接口失败:{}", e.getMessage(), e); } return execute; } /** * 获得表单请求 * * @param url 请求地址 * @param jsonObject 参数DTO * @author aaa 2022-04-28 */ private Request getFormRequest(String url, JSONObject jsonObject) { // 获得请求构造器 Request.Builder requestBuilder = new Request.Builder(); // 设置表单请求的请求头 try { requestBuilder.addHeader("content-type", "application/x-www-form-urlencoded").post(getFormBody(jsonObject)).url(new URL(url)); } catch (MalformedURLException e) { log.info("url转换失败:{}", e.getMessage(), e); } // 返回请求对象 return requestBuilder.build(); } /** * 获取请求客户端 * * @author aaa 2022-04-28 */ private OkHttpClient getRequestClient() { return new OkHttpClient.Builder() .readTimeout(2L, TimeUnit.MINUTES) .build(); } /** * 获取form表单请求的body * * @param jsonObject 请求参数DTO * @author aaa 2022-04-28 */ private FormBody getFormBody(JSONObject jsonObject) { // 获取表单请求构造器 FormBody.Builder fb = new FormBody.Builder(); // 设置请求参数 jsonObject.keySet().forEach(item -> fb.addEncoded(item, jsonObject.getString(item))); // 返回body return fb.build(); } }
通用请求参数类
@Data @Accessors(chain = true) @EqualsAndHashCode(callSuper = false) public class HttpDTO implements Serializable { private static final long serialVersionUID = 1L; @NotNull(message = "请求路径不能为空") @NotBlank(message = "请求路径不能为空") @ApiModelProperty(value = "请求路径url") private String url; @ApiModelProperty(value = "参数") private Object obj; @NotNull(message = "是否需要token 不能为空") @ApiModelProperty(value = "是否需要token:true是,false否") private Boolean needToken; }
请求调用示例
public List<String> getSkuCode(String classifyCode) { ResultVO interfaceResult = httpService.getInterfaceResult(new HttpDTO() .setUrl(Constant.HOST.concat(Constant.GOODS_GET_SKUS_BY_CLASSID_URI)) .setNeedToken(true) .setObj(new DeLiGetSkusByClassId3DTO().setCode(classifyCode3).setIsAll(1))); log.info(interfaceResult.getResultMessage()); return JSONArray.parseArray(interfaceResult.getResult(), String.class); }
上边的请求返回,从结果里取出result字符串,再转一下list,这可以放在后面的请求方法中,传一个返回的类class。使用objectMapper转一下。
private ObjectMapper mapper = new ObjectMapper(); public <T, RR> Response<RR> api(ApiDTO<T> jsonParams, Class<RR> responseResult) { String json = JSONObject.toJSONString(jsonParams); log.info("三方api.do, requestParams:{}", json); String responseStr = this.thirdFileAgentFeign.api(json); // 构建返回类型 JavaType javaType1 = this.mapper.getTypeFactory().constructParametricType(YZResponse.class, new Class[]{responseResult}); try { // 这个代码块就看这里返回带泛型的类 return (Response)this.mapper.readValue(responseStr, javaType1); } catch (JsonProcessingException e) { log.error("反序列化返回值异常, responseStr:{}, errInfo:{}", new Object[]{responseStr, var7.getMessage(), e}); throw new E("反序列化返回值异常"); } }
第二种返回类型
import com.fasterXML.jackson.core.type.TypeReference; public static <T> T toObj(String json, Class<T> type) { try { return MAPPER.readValue(json, type); } catch (IOException e) { log.error("toObj error", e); throw E.of(BaseExceptionEnum.FORMAT_ERROR); } } public static <T> T toObj(String json, TypeReference<T> typeReference) { try { return mapper.readValue(json, typeReference); } catch (IOException e) { log.error("toObj error", e); throw E.of(BaseExceptionEnum.FORMAT_ERROR); } }
泛型返回处理可以参考RestTemplate里面的postForObject()
Class<?> deserializationView = ((MappingJacksonInputMessage)inputMessage).getDeserializationView(); if (deserializationView != null) { // 部分代码,构建一个reader ObjectReader objectReader = this.objectMapper.readerWithView(deserializationView).forType(javaType); if (isUnicode) { // 返回class类型的对象 return objectReader.readValue(inputMessage.getBody()); } Reader reader = new InputStreamReader(inputMessage.getBody(), charset); return objectReader.readValue(reader); }
具体可以学习一下ObjectMapper的用法
请求接口返回结果类
@Accessors(chain = true) @EqualsAndHashCode(callSuper = false) public class ResultVO implements Serializable { private static final long serialVersionUID = 1L; @ApiModelProperty(value = "接口返回成功与否") private Boolean success; @ApiModelProperty(value = "返回数据描述") private String resultMessage; @ApiModelProperty(value = "平台业务代码标记") private String resultCode; // 返回的json结果,再处理成返回对象 @ApiModelProperty(value = "业务数据") private String result; }
三、调用第三方生成token,可以使用策略类实现
策略接口类
public interface TokenGeneratorStrategy { /** * 获取token * * @author aaa 2022-04-26 */ String getToken(); /** * 获取token缓存key * * @author aaa 2022-04-26 */ String getTokenCacheKey(); /** * 获取token过期时间,采用Redis单位 * * @author aaa 2022-04-26 */ Duration getTokenExpireTime(); }
获取token的实现类
package com.generator; import com.alibaba.fastjson.JSONObject; import com.common.constant.ThirdConstant; import com.common.constant.MallCacheKeyConstant; import com.common.constant.MallCommonConstant; import com.common.dto.coop.HttpDTO; import com.common.vo.coop.ThirdResultVO; import com.common.vo.coop.ThirdTokenVO; import com.cooperation.dto.ThirdTokenDTO; import com.cooperation.service.HttpService; import com.cooperation.strategy.TokenGeneratorStrategy; import com.common.exception.E; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.util.DigestUtils; import java.nio.charset.StandardCharsets; import java.time.Duration; import java.time.LocalDate; import java.time.LocalDateTime; import java.time.LocalTime; import java.time.format.DateTimeFormatter; import java.util.Objects; /** * 三方生成token * */ @Slf4j @Service public class ThirdTokenGenerator implements TokenGeneratorStrategy { @Autowired private HttpService httpService; @Override public String getToken() { // 获取当前时间,转换成yyyy/MM/dd格式 DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"); String format = LocalDateTime.now().format(dateTimeFormatter); // 签名规则:client_secret+timestamp+client_id+username+password+scope+client_secret将上面字符串MD5 加密后转为小写。 String sign = ThirdConstant.CLIENT_SECRET .concat(format) .concat(ThirdConstant.CLIENT_ID) .concat(ThirdConstant.USERNAME) .concat(ThirdConstant.PASSWORD) .concat(ThirdConstant.CLIENT_SECRET); // md5 加密 String signMd5 = DigestUtils.md5DigestAsHex(sign.getBytes(StandardCharsets.UTF_8)).toLowerCase(); ThirdTokenDTO ThirdTokenDto = new ThirdTokenDTO().setClient_id(ThirdConstant.CLIENT_ID).setClient_secret(ThirdConstant.CLIENT_SECRET) .setUsername(ThirdConstant.USERNAME).setPassword(ThirdConstant.PASSWORD) .setTimestamp(format).setSign(signMd5); // 接口调用 编程客栈 ThirdResultVO interfaceResult = httpService.getInterfaceResult( new HttpDTO() .setUrl(ThirdConstant.HOST.concat(ThirdConstant.TOKEN_URI)) .setObj(ThirdTokenDto) .setNeedToken(false)); ThirdTokenVO ThirdToken = new ThirdTokenVO(); try { ThirdToken = JSONObject.parseObject(interfaceResult.getResult(), ThirdTokenVO.class); } catch (Exception e) { log.info("token 返回值处理异常:{}", e.getMessage(), e); } if (Objects.isNull(ThirdToken)) { log.error("获取三方token为空----{}", interfaceResult); throw new E("获取三方token异常信息--" + interfaceResult.getResultMessage()); } return ThirdToken.getAccess_token(); } @Override public String getTokenCacheKey() { return MallCacheKeyConstant.COOP_Third_TOKEN + MallCommonConstant.DEFAULT_KEY; } /** * 三方有效时间一小时,这里的过期时间采用50分钟 */ @Override public Duration getTokenExpireTime() { // 当前时间到12点的时间 Duration nowTo12 = Duration.between(LocalDateTime.now(), LocalDateTime.of(LocalDate.now(), LocalTime.MAX)); // 50分钟 Duration fiftyMin = Duration.ofSeconds(50 * 60L); // 如果当前时间到12点的时间超过50分钟,返回50分钟 if (nowTo12.compareTo(fiftyMin) > 0) { return fiftyMin; } // 否则返回当前时间到12点的时间 return nowTo12; } }
总结
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