两个服务之间的调用请求

使用

package com.thunisoft.sspt.bootstrap;

import com.thunisoft.maybee.engine.restclient.RestClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Configuration
public class LocalRestClient {

    @Autowired
    private RestTemplate restTemplate;

    @Bean
    public RestClient restClient() {

        Map<String, String> server = new HashMap<>();
        server.put("scheme", "http");
        server.put("host", "localhost");
        server.put("port", "9999");

        List<Map<String, String>> servers = new ArrayList<>();
        servers.add(server);

        return new RestClient(restTemplate, servers);
    }
}

类

package com.thunisoft.maybee.engine.restclient;

import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.thunisoft.maybee.engine.request.RequestUtil;
import com.thunisoft.maybee.engine.utils.JsonUtil;
import com.thunisoft.maybee.engine.utils.MapUrlParamsUtils;
import com.thunisoft.maybee.engine.utils.MapUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.*;

/**
 * default RestTemplate class extends.
 */
public class RestClient {

    private List<Map<String, String>> serverAddress;

    @Autowired
    private RestTemplate restTemplate;

    public RestClient() {

    }

    public RestClient(RestTemplate restTemplate, List<Map<String, String>> serverAddress) {
        this.setRestTemplate(restTemplate);
        this.setServerAddress(serverAddress);
    }

    /**
     * 以GET方式操作服务，主要用于查询操作
     *
     * @param serviceMethod
     * @param clazz
     * @param params
     * @param <T>           集合对象或者单一对象 统一使用 T.class
     * @return
     */
    public <T> T getService(String serviceMethod, Class<T> clazz, Map<String, Object> params) {
        return excuteService("GET", serviceMethod, clazz, params, null);
    }

    /**
     * 以POST方式操作服务，主要用于增删改
     *
     * @param serviceMethod
     * @param clazz
     * @param params
     * @param headers
     * @param <T>           增加、删除、更改 建议使用 String.class
     * @return
     */
    public <T> T postService(String serviceMethod, Class<T> clazz, Map<String, Object> params, HttpHeaders headers) {
        return excuteService("POST", serviceMethod, clazz, params, headers);
    }

    /**
     * 服务执行方法
     *
     * @param httpMethod
     * @param serviceMethod
     * @param clazz
     * @param params
     * @param headers
     * @param <T>
     * @return
     */
    private <T> T excuteService(String httpMethod, String serviceMethod, Class<T> clazz, Map<String, Object> params, HttpHeaders headers) {
        Map<String, Object> otherParams = new HashMap<>();
//        otherParams.put("accessToken", RequestUtil.getAccessToken());
        // put in the HTTP headers.
        if (headers == null) {
            headers = new HttpHeaders();
        }
        headers.add("accessToken", RequestUtil.getAccessToken());
        Map<String, Object> requestParams = MapUtils.addParams(params, otherParams);
        String urlParamsByMap = MapUrlParamsUtils.getUrlParamsByMap(requestParams);
        Map<String, String> randomOneServer = null;
        try {
            randomOneServer = this.getRandomOneServer();
        } catch (Exception e) {
            // nothing...
            System.out.println("server is null : " + e.getMessage());
        }
        URI uri = null;
        try {
            if (HttpMethod.POST.matches(httpMethod)) {
                uri = new URI(randomOneServer.get("scheme"), null, randomOneServer.get("host"), Integer.valueOf(randomOneServer.get("port")), serviceMethod, null, null);
            } else if (HttpMethod.GET.matches(httpMethod)) {
                uri = new URI(randomOneServer.get("scheme"), null, randomOneServer.get("host"), Integer.valueOf(randomOneServer.get("port")), serviceMethod, urlParamsByMap, null);
            }
        } catch (URISyntaxException e) {
            // nothing...
            System.out.println(e.getMessage());
            return null;
        }
        ObjectMapper mapper = new ObjectMapper();
        if (HttpMethod.GET.matches(httpMethod)) {
//            String forObject = this.getRestTemplate().getForObject(uri, String.class);
            HttpEntity httpEntity = new HttpEntity(headers);
            ResponseEntity<String> exchange = this.getRestTemplate().exchange(uri, HttpMethod.GET, httpEntity, String.class);
            String forObject = exchange.getBody();
            JsonUtil.JSON_TYPE jsonType = JsonUtil.getJSONType(forObject);
            try {
                switch (jsonType) {
                    case JSON_TYPE_ARRAY:
                        JavaType javaType = getCollectionType(mapper, ArrayList.class, clazz);
                        return mapper.readValue(forObject, javaType);
                    case JSON_TYPE_OBJECT:
                        return mapper.readValue(forObject, clazz);
                    default:
                        return null;
                }
            } catch (IOException e) {
                // nothing...
                System.out.println(e.getMessage());
                return null;
            }
        } else if (HttpMethod.POST.matches(httpMethod)) {
            MultiValueMap reqParams = new LinkedMultiValueMap();
            Set<Map.Entry<String, Object>> entries = requestParams.entrySet();
            for (Map.Entry<String, Object> entry : entries) {
                reqParams.add(entry.getKey(), entry.getValue());
            }
            HttpEntity httpEntity = new HttpEntity(reqParams, headers);
            return this.getRestTemplate().postForObject(uri.toString(), httpEntity, clazz);
        } else {
            return null;
        }
    }

    /**
     * 获取泛型的Collection Type
     *
     * @param collectionClass 泛型的Collection
     * @param elementClasses  元素类
     * @return JavaType Java类型
     * @since 1.0
     */
    private JavaType getCollectionType(ObjectMapper mapper, Class<?> collectionClass, Class<?>... elementClasses) {
        return mapper.getTypeFactory().constructParametricType(collectionClass, elementClasses);
    }

    /**
     * 随机获取一个服务
     *
     * @return
     */
    private Map<String, String> getRandomOneServer() throws Exception {

        if (this.getServerAddress() == null) {
            throw new Exception("配置为空！");
        }

        Random rand = new Random();
        return this.getServerAddress().get(rand.nextInt(this.getServerAddress().size()));
    }


    public RestTemplate getRestTemplate() {
        return restTemplate;
    }

    public void setRestTemplate(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    public List<Map<String, String>> getServerAddress() {
        return serverAddress;
    }

    public void setServerAddress(List<Map<String, String>> serverAddress) {
        this.serverAddress = serverAddress;
    }
}