Java调用第三方接口封装实现
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.BASE64Encoder;
@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 BASE64Encoder();
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[]{"**", 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 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(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;
@Slf4j
@Service
public class HttpService2 {
@Autowired
private TokenTemplate tokenTemplate;
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;
}
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;
}
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;
}
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();
}
private OkHttpClient getRequestClient() {
return new OkHttpClient.Builder()
.readTimeout(2L, TimeUnit.MINUTES)
.build();
}
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 {
String getToken();
String getTokenCacheKey();
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;
@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
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;
}
@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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