Java调用第三方接口封装实现
短信预约 -IT技能 免费直播动态提醒
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
到此这篇关于Java调用第三方接口封装实现的文章就介绍到这了,更多相关Java调用第三方接口封装内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
免责声明：
① 本站未注明“稿件来源”的信息均来自网络整理。其文字、图片和音视频稿件的所属权归原作者所有。本站收集整理出于非商业性的教育和科研之目的，并不意味着本站赞同其观点或证实其内容的真实性。仅作为临时的测试数据，供内部测试之用。本站并未授权任何人以任何方式主动获取本站任何信息。
② 本站未注明“稿件来源”的临时测试数据将在测试完成后最终做删除处理。有问题或投稿请发送至: 邮箱/279061341@qq.com QQ/279061341
