RestTemplate使用

　在微服务都是以HTTP接口的形式暴露自身服务的，因此在调用远程服务时就必须使用HTTP客户端。我们可以使用JDK原生的URLConnection、Apache的Http Client、Netty的异步HTTP Client, Spring的RestTemplate。但是，用起来最方便、最优雅的还是要属Feign了。这里介绍的是RestTemplate。

什么是RestTemplate？

RestTemplate是Spring提供的用于访问Rest服务的客户端，

RestTemplate提供了多种便捷访问远程Http服务的方法,能够大大提高客户端的编写效率。

调用RestTemplate的默认构造函数，RestTemplate对象在底层通过使用java.net包下的实现创建HTTP 请求，

可以通过使用ClientHttpRequestFactory指定不同的HTTP请求方式。

ClientHttpRequestFactory接口主要提供了两种实现方式

1、一种是SimpleClientHttpRequestFactory，使用J2SE提供的方式（既java.net包提供的方式）创建底层的Http请求连接。

2、一种方式是使用HttpComponentsClientHttpRequestFactory方式，底层使用HttpClient访问远程的Http服务，使用HttpClient可以配置连接池和证书等信息。

---

xml配置的方式

请查看RestTemplate源码了解细节，知其然知其所以然！

RestTemplate默认是使用SimpleClientHttpRequestFactory，内部是调用jdk的HttpConnection，默认超时为-1

@Autowired
RestTemplate simpleRestTemplate
@Autowired
RestTemplate restTemplate

 基于jdk的spring的RestTemplate

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"
       default-autowire="byName" default-lazy-init="true">
 
    <!--方式一、使用jdk的实现-->
    <bean id="ky.requestFactory" class="org.springframework.http.client.SimpleClientHttpRequestFactory">
        <property name="readTimeout" value="10000"/>
        <property name="connectTimeout" value="5000"/>
    </bean>
 
    <bean id="simpleRestTemplate" class="org.springframework.web.client.RestTemplate">
        <constructor-arg ref="ky.requestFactory"/>
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.FormHttpMessageConverter"/>
                <bean class="org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter"/>
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
                <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                    <property name="supportedMediaTypes">
                        <list>
                            <value>text/plain;charset=UTF-8</value>
                        </list>
                    </property>
                </bean>
            </list>
        </property>
    </bean>
</beans>

使用Httpclient连接池的方式

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"
       default-autowire="byName" default-lazy-init="true">
 
    <!--方式二、使用httpclient的实现，带连接池-->
    <bean id="ky.pollingConnectionManager" class="org.apache.http.impl.conn.PoolingHttpClientConnectionManager">
        <!--整个连接池的并发-->
        <property name="maxTotal" value="1000" />
        <!--每个主机的并发-->
        <property name="defaultMaxPerRoute" value="1000" />
    </bean>
 
    <bean id="ky.httpClientBuilder" class="org.apache.http.impl.client.HttpClientBuilder" factory-method="create">
        <property name="connectionManager" ref="ky.pollingConnectionManager" />
        <!--开启重试-->
        <property name="retryHandler">
            <bean class="org.apache.http.impl.client.DefaultHttpRequestRetryHandler">
                <constructor-arg value="2"/>
                <constructor-arg value="true"/>
            </bean>
        </property>
        <property name="defaultHeaders">
            <list>
                <bean class="org.apache.http.message.BasicHeader">
                    <constructor-arg value="User-Agent"/>
                    <constructor-arg value="Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.16 Safari/537.36"/>
                </bean>
                <bean class="org.apache.http.message.BasicHeader">
                    <constructor-arg value="Accept-Encoding"/>
                    <constructor-arg value="gzip,deflate"/>
                </bean>
                <bean class="org.apache.http.message.BasicHeader">
                    <constructor-arg value="Accept-Language"/>
                    <constructor-arg value="zh-CN"/>
                </bean>
            </list>
        </property>
    </bean>
 
    <bean id="ky.httpClient" factory-bean="ky.httpClientBuilder" factory-method="build" />
 
    <bean id="ky.clientHttpRequestFactory" class="org.springframework.http.client.HttpComponentsClientHttpRequestFactory">
        <constructor-arg ref="ky.httpClient"/>
        <!--连接超时时间，毫秒-->
        <property name="connectTimeout" value="5000"/>
        <!--读写超时时间，毫秒-->
        <property name="readTimeout" value="10000"/>
    </bean>
 
    <bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
        <constructor-arg ref="ky.clientHttpRequestFactory"/>
        <property name="errorHandler">
            <bean class="org.springframework.web.client.DefaultResponseErrorHandler"/>
        </property>
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.FormHttpMessageConverter"/>
                <bean class="org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter"/>
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
                <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                    <property name="supportedMediaTypes">
                        <list>
                            <value>text/plain;charset=UTF-8</value>
                        </list>
                    </property>
                </bean>
            </list>
        </property>
    </bean>
 
</beans>

bean初始化+静态工具

线程安全的单例（懒汉模式）

基于jdk的spring的RestTemplate

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Lazy;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.http.converter.FormHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;
import org.springframework.stereotype.Component;
import org.springframework.web.client.DefaultResponseErrorHandler;
import org.springframework.web.client.RestTemplate;
 
import javax.annotation.PostConstruct;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
 
/**
* @title：基于jdk的spring的RestTemplate
* @author：liuxing
* @date：2015-05-18 09:35
*/
@Component
@Lazy(false)
public class SimpleRestClient {
 
    private static final Logger LOGGER = LoggerFactory.getLogger(SimpleRestClient.class);
 
    private static RestTemplate restTemplate;
 
    static {
        SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
        requestFactory.setReadTimeout(5000);
        requestFactory.setConnectTimeout(5000);
 
        // 添加转换器
        List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
        messageConverters.add(new StringHttpMessageConverter(Charset.forName("UTF-8")));
        messageConverters.add(new FormHttpMessageConverter());
        messageConverters.add(new MappingJackson2XmlHttpMessageConverter());
        messageConverters.add(new MappingJackson2HttpMessageConverter());
 
        restTemplate = new RestTemplate(messageConverters);
        restTemplate.setRequestFactory(requestFactory);
        restTemplate.setErrorHandler(new DefaultResponseErrorHandler());
 
        LOGGER.info("SimpleRestClient初始化完成");
    }
 
    private SimpleRestClient() {
 
    }
 
    @PostConstruct
    public static RestTemplate getClient() {
        return restTemplate;
    }
 
}

使用Httpclient连接池的方式

import org.apache.http.Header;
import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicHeader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Lazy;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.http.converter.FormHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;
import org.springframework.stereotype.Component;
import org.springframework.web.client.DefaultResponseErrorHandler;
import org.springframework.web.client.RestTemplate;
 
import javax.annotation.PostConstruct;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
 
/**
* @title：使用spring的restTemplate替代httpclient工具
* @author：liuxing
* @date：2015-05-18 08:48
*/
@Component
@Lazy(false)
public class RestClient {
 
    private static final Logger LOGGER = LoggerFactory.getLogger(SimpleRestClient.class);
 
    private static RestTemplate restTemplate;
 
    static {
        // 长连接保持30秒
        PoolingHttpClientConnectionManager pollingConnectionManager = new PoolingHttpClientConnectionManager(30, TimeUnit.SECONDS);
        // 总连接数
        pollingConnectionManager.setMaxTotal(1000);
        // 同路由的并发数
        pollingConnectionManager.setDefaultMaxPerRoute(1000);
 
        HttpClientBuilder httpClientBuilder = HttpClients.custom();
        httpClientBuilder.setConnectionManager(pollingConnectionManager);
        // 重试次数，默认是3次，没有开启
        httpClientBuilder.setRetryHandler(new DefaultHttpRequestRetryHandler(2, true));
        // 保持长连接配置，需要在头添加Keep-Alive
        httpClientBuilder.setKeepAliveStrategy(new DefaultConnectionKeepAliveStrategy());
 
//        RequestConfig.Builder builder = RequestConfig.custom();
//        builder.setConnectionRequestTimeout(200);
//        builder.setConnectTimeout(5000);
//        builder.setSocketTimeout(5000);
//
//        RequestConfig requestConfig = builder.build();
//        httpClientBuilder.setDefaultRequestConfig(requestConfig);
 
        List<Header> headers = new ArrayList<>();
        headers.add(new BasicHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.16 Safari/537.36"));
        headers.add(new BasicHeader("Accept-Encoding", "gzip,deflate"));
        headers.add(new BasicHeader("Accept-Language", "zh-CN"));
        headers.add(new BasicHeader("Connection", "Keep-Alive"));
 
        httpClientBuilder.setDefaultHeaders(headers);
 
        HttpClient httpClient = httpClientBuilder.build();
 
        // httpClient连接配置，底层是配置RequestConfig
        HttpComponentsClientHttpRequestFactory clientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);
        // 连接超时
        clientHttpRequestFactory.setConnectTimeout(5000);
        // 数据读取超时时间，即SocketTimeout
        clientHttpRequestFactory.setReadTimeout(5000);
        // 连接不够用的等待时间，不宜过长，必须设置，比如连接不够用时，时间过长将是灾难性的
        clientHttpRequestFactory.setConnectionRequestTimeout(200);
        // 缓冲请求数据，默认值是true。通过POST或者PUT大量发送数据时，建议将此属性更改为false，以免耗尽内存。
        // clientHttpRequestFactory.setBufferRequestBody(false);
 
        // 添加内容转换器
        List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
        messageConverters.add(new StringHttpMessageConverter(Charset.forName("UTF-8")));
        messageConverters.add(new FormHttpMessageConverter());
        messageConverters.add(new MappingJackson2XmlHttpMessageConverter());
        messageConverters.add(new MappingJackson2HttpMessageConverter());
 
        restTemplate = new RestTemplate(messageConverters);
        restTemplate.setRequestFactory(clientHttpRequestFactory);
        restTemplate.setErrorHandler(new DefaultResponseErrorHandler());
 
        LOGGER.info("RestClient初始化完成");
    }
 
    private RestClient() {
 
    }
 
    @PostConstruct
    public static RestTemplate getClient() {
        return restTemplate;
    }
 
}

HttpClientUtils

import com.dooioo.commons.Strings;
import com.dooioo.framework.SpringContextHolder;
import com.dooioo.ky.cache.HttpClientResultCache;
import org.apache.commons.collections.MapUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpEntity;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
 
import java.util.Map;
 
/**
*
* 类功能说明：httpclient工具类,基于httpclient 4.x
* Title: HttpClientUtils.java
* @author 刘兴
* @date 2014-3-7 下午7:48:58
* @version V1.0
*/
public class HttpClientUtils {
 
    private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientUtils.class);
 
    /**
     * post请求
     * @param url
     * @param formParams
     * @return
     */
    public static String doPost(String url, Map<String, String> formParams) {
        if (MapUtils.isEmpty(formParams)) {
            return doPost(url);
        }
 
        try {
            MultiValueMap<String, String> requestEntity = new LinkedMultiValueMap<>();
            formParams.keySet().stream().forEach(key -> requestEntity.add(key, MapUtils.getString(formParams, key, "")));
            return RestClient.getClient().postForObject(url, requestEntity, String.class);
        } catch (Exception e) {
            LOGGER.error("POST请求出错：{}", url, e);
        }
 
        return Strings.EMPTY;
    }
 
    /**
     * post请求
     * @param url
     * @return
     */
    public static String doPost(String url) {
        try {
            return RestClient.getClient().postForObject(url, HttpEntity.EMPTY, String.class);
        } catch (Exception e) {
            LOGGER.error("POST请求出错：{}", url, e);
        }
 
        return Strings.EMPTY;
    }
 
    /**
     * get请求
     * @param url
     * @return
     */
    public static String doGet(String url) {
        try {
            return RestClient.getClient().getForObject(url, String.class);
        } catch (Exception e) {
            LOGGER.error("GET请求出错：{}", url, e);
        }
 
        return Strings.EMPTY;
    }
 
}

ErrorHolder

自定义的一个异常结果包装类

 

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.web.client.HttpClientErrorException;
import org.springframework.web.client.HttpServerErrorException;
 
/**
* @title：ErrorHolder
* @author：liuxing
* @date：2015-06-16 11:01
*/
public class ErrorHolder {
 
    private HttpStatus statusCode;
 
    private String statusText;
 
    private String responseBody;
 
    private HttpHeaders responseHeaders;
 
    public ErrorHolder(HttpStatus statusCode, String statusText, String responseBody) {
        this.statusCode = statusCode;
        this.statusText = statusText;
        this.responseBody = responseBody;
    }
 
    public ErrorHolder(String statusText) {
        this.statusText = statusText;
    }
 
    public HttpStatus getStatusCode() {
        return statusCode;
    }
 
    public void setStatusCode(HttpStatus statusCode) {
        this.statusCode = statusCode;
    }
 
    public String getStatusText() {
        return statusText;
    }
 
    public void setStatusText(String statusText) {
        this.statusText = statusText;
    }
 
    public String getResponseBody() {
        return responseBody;
    }
 
    public void setResponseBody(String responseBody) {
        this.responseBody = responseBody;
    }
 
    public HttpHeaders getResponseHeaders() {
        return responseHeaders;
    }
 
    public void setResponseHeaders(HttpHeaders responseHeaders) {
        this.responseHeaders = responseHeaders;
    }
 
    public static ErrorHolder build(Exception exception) {
        if (exception instanceof HttpServerErrorException) {
            HttpServerErrorException e = (HttpServerErrorException) exception;
            return new ErrorHolder(e.getStatusCode(), e.getStatusText(), e.getResponseBodyAsString());
        }
 
        if (exception instanceof HttpClientErrorException) {
            HttpClientErrorException e = (HttpClientErrorException) exception;
            return new ErrorHolder(e.getStatusCode(), e.getStatusText(), e.getResponseBodyAsString());
        }
 
        return new ErrorHolder(exception.getMessage());
    }
}

使用样例

api里面可以做自动的参数匹配：
如：http://you domainn name/test?empNo={empNo}，则下面方法的最后一个参数为数据匹配参数，会自动根据key进行查找，然后替换

API没有声明异常，注意进行异常处理

更多使用语法请查看API文档

ResponseEntity<List<KyArea>> result = RestClient.getClient().exchange(DIVIDE_PLATE_API, HttpMethod.GET, HttpEntity.EMPTY, new ParameterizedTypeReference<List<KyArea>>() {},map("empNo", empNo));
List<KyArea> list = result.getBody();
 
ResponseEntity<KyArea> result = RestClient.getClient().exchange(DIVIDE_PLATE_API, HttpMethod.GET, HttpEntity.EMPTY, KyArea.class, map("empNo", empNo));
KyArea kyArea = result.getBody();

更多

RestTemplate API说明和使用参考

http://docs.spring.io/spring/docs/4.1.x/javadoc-api/org/springframework/web/client/RestTemplate.html

http://docs.spring.io/spring/docs/4.1.x/javadoc-api/org/springframework/http/client/SimpleClientHttpRequestFactory.html

http://docs.spring.io/spring/docs/4.1.x/javadoc-api/org/springframework/http/client/HttpComponentsClientHttpRequestFactory.html

HttpClient官方示例和参数配置说明

http://hc.apache.org/httpcomponents-client-4.4.x/examples.html

http://hc.apache.org/httpcomponents-client-4.4.x/tutorial/html/index.html

依赖
spring 3.x以上

注意点

1.关于httpclient配置的 defaultMaxPerRoute和 maxTotal
defaultMaxPerRoute：最大路由并发数，以主机为单位
maxTotal：整个连接池的并发数

例如：
defaultMaxPerRoute为10， maxTotal为100
假设只会访问http://www.baidu.com和http://www.google.com
那么能同时并发到客源的只能是10，房源也是10，整个连接永远不会到100

2.部分方法注意查看源码，默认构造里面会新增常用的数据转换器，spring对jackson比较情有独钟，在解析xml和json时，优先使用jackson