一、概述

　　http请求项目搭建：地址:https://github.com/bjlhx15/common-study.git 中的common-http

　　主要针对post请求中的，form表单【application/x-www-form-urlcoded】提交，json【application/json】提交，文件【multipart/form-data】提交

　　详细参看：005-四种常见的 POST 提交数据方式

1.1、文件提交配置

pom

        <!--  文件提交--><!-- commons-fileupload 包含 commons-io --><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.3</version></dependency>

spring bean xml配置

    <!-- 定义文件上传解析器 --><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><!-- 设定默认编码 --><property name="defaultEncoding" value="UTF-8" /><!-- 设定文件上传的最大值5MB，5*1024*1024 --><property name="maxUploadSize" value="5242880" /><property name="maxInMemorySize" value="4096" /></bean>

代码开发

    @RequestMapping("/upload")@ResponseBodypublic Object upload(@RequestParam("file") MultipartFile file) throws Exception {Map<String, Object> map = new HashMap<>();map.put("code", "2000");map.put("size", file.getBytes().length);return map;}

服务端接收文件的处理方式如下：推荐使用transferTo 速度比较快

    /*** 1、获取 流 方式处理** @param file* @return* @throws Exception*/@RequestMapping("/uploadHandler1")@ResponseBodypublic Object uploadHandler1(@RequestParam("file") MultipartFile file) throws Exception {Map<String, Object> map = new HashMap<>();map.put("code", "2000");map.put("size", file.getBytes().length);//获取输入流 CommonsMultipartFile 中可以直接得到文件的流InputStream is = file.getInputStream();return map;}/*** 2、使用file.Transto 来保存上传的文件** @param file* @return* @throws Exception*/@RequestMapping("/uploadHandler2")@ResponseBodypublic Object uploadHandler2(@RequestParam("file") MultipartFile file) throws Exception {Map<String, Object> map = new HashMap<>();map.put("code", "2000");map.put("size", file.getBytes().length);File newFile = new File("path");//通过CommonsMultipartFile的方法直接写文件（注意这个时候）
        file.transferTo(newFile);return map;}/*** 3、使用HttpServletRequest 自己写** @param file* @return* @throws Exception*/@RequestMapping("/uploadHandler3")@ResponseBodypublic Object uploadHandler3(HttpServletRequest request) throws Exception {Map<String, Object> map = new HashMap<>();map.put("code", "2000");//将当前上下文初始化给  CommonsMutipartResolver （多部分解析器）CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());//检查form中是否有enctype="multipart/form-data"if (multipartResolver.isMultipart(request)) {//将request变成多部分requestMultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;//获取multiRequest 中所有的文件名Iterator iter = multiRequest.getFileNames();while (iter.hasNext()) {//一次遍历所有文件MultipartFile file = multiRequest.getFile(iter.next().toString());if (file != null) {String path = "E:/springUpload" + file.getOriginalFilename();//上传file.transferTo(new File(path));}}}return map;}

View Code

1.2、postman请求测试【可以导入以下json测试】

{"id": "a8b343a0-434d-0f97-0757-65cc1e9591b7","name": "http","description": "","order": [],"folders": [{"name": "form","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","order": ["978d45f7-4673-4196-cacb-553699863f1d","00d68b33-974d-78d2-27f0-09889b5a5a3c","7060e912-d5d0-1731-9385-ce25fd0e88ff","790f2d92-7482-de03-3fc1-56ae53635471","bb8e21af-5acf-9f05-9c34-5f0425055e97","f905ac7b-953a-88c7-00b2-d8b936be4207"],"owner": 0,"folders_order": [],"id": "74f0c28e-dbc8-969d-f173-6864fb2acfa8"},{"name": "json","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","order": ["9f923f96-17e7-7a56-f044-f5962e47d046","a3bd7e77-ada4-4842-e5e9-d9869b30d0ab","c804a86e-a365-8b2a-6ceb-c548fc1d2f15","308d4f4b-493e-ed41-5aec-97b4789fb12c","317dfa64-1b31-e0b9-b9b0-50e7430455ee","fb811f2b-03b1-23b3-3077-5c56edf8a030","063968d2-c7af-59d4-c906-e0c38baf1184","86bbfbce-1fb2-2c85-4036-f1d6605046af"],"owner": 0,"folders_order": [],"id": "1759fa83-80ac-112b-d732-ef84cef8b692"},{"name": "multipart","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","order": ["e86731bb-9efb-0cb9-7df7-19cafbe581cd","fc04a41c-6123-d2ce-81f1-96ec54989acc","26cd6e2d-d115-d62b-6051-8db5b52e9299","cecfce52-448e-1016-946d-b6e4e50561d2","24b708d1-4f64-1700-2c84-c743bf689fc5","e90f5a7b-e924-131e-0b2a-0dd6a467c222","8654a7de-9249-0f63-4b78-243e2524f6a6","687c99c6-75b5-6c17-b93a-da10735a14dc","8dbe5329-7512-528d-61b2-df1f376ba48e","c317bed2-1ab8-4ac0-1570-72de93f140cd"],"owner": 0,"folders_order": [],"id": "70d362df-168c-a821-3b29-cac943e77301"}],"folders_order": ["74f0c28e-dbc8-969d-f173-6864fb2acfa8","1759fa83-80ac-112b-d732-ef84cef8b692","70d362df-168c-a821-3b29-cac943e77301"],"timestamp": 1564578515435,"owner": 0,"public": false,"requests": [{"id": "00d68b33-974d-78d2-27f0-09889b5a5a3c","headers": "Content-Type: application/x-www-form-urlencoded\n","headerData": [{"key": "Content-Type","value": "application/x-www-form-urlencoded","description": "","enabled": true}],"url": "http://localhost:8080/form/params?id=1","folder": "74f0c28e-dbc8-969d-f173-6864fb2acfa8","queryParams": [{"key": "id","value": "1","equals": true,"description": "","enabled": true}],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [{"key": "id","value": "id","description": "","type": "text","enabled": true},{"key": "msg","value": "msg好的","description": "","type": "text","enabled": true}],"dataMode": "urlencoded","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564582887199,"name": "/form/params-url-body ok","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": []},{"id": "063968d2-c7af-59d4-c906-e0c38baf1184","headers": "Content-Type: application/json\n","headerData": [{"key": "Content-Type","value": "application/json","description": "","enabled": true}],"url": "http://localhost:8080/json/paramsobject1?name=name&age=344","folder": "1759fa83-80ac-112b-d732-ef84cef8b692","queryParams": [{"key": "name","value": "name","equals": true,"description": "","enabled": true},{"key": "age","value": "344","equals": true,"description": "","enabled": true}],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [],"dataMode": "raw","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564583900424,"name": "/paramsobject1-url no","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": [],"rawModeData": "{}"},{"id": "24b708d1-4f64-1700-2c84-c743bf689fc5","headers": "Content-Type: application/json\n","headerData": [{"key": "Content-Type","value": "application/json","description": "","enabled": true}],"url": "http://localhost:8080/multipart/paramsobject?name=name&age=34","folder": "70d362df-168c-a821-3b29-cac943e77301","queryParams": [{"key": "name","value": "name","equals": true,"description": "","enabled": true},{"key": "age","value": "34","equals": true,"description": "","enabled": true}],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [],"dataMode": "params","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564584125617,"name": "/paramsobject-url ok","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": []},{"id": "26cd6e2d-d115-d62b-6051-8db5b52e9299","headers": "Content-Type: application/json\n","headerData": [{"key": "Content-Type","value": "application/json","description": "","enabled": true}],"url": "http://localhost:8080/multipart/params1?id=1&msg=2","folder": "1759fa83-80ac-112b-d732-ef84cef8b692","queryParams": [{"key": "id","value": "1","equals": true,"description": "","enabled": true},{"key": "msg","value": "2","equals": true,"description": "","enabled": true}],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [],"dataMode": "params","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564584050000,"name": "/params1-url ok","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": []},{"id": "308d4f4b-493e-ed41-5aec-97b4789fb12c","headers": "Content-Type: application/json\n","headerData": [{"key": "Content-Type","value": "application/json","description": "","enabled": true}],"url": "http://localhost:8080/json/params1","folder": "1759fa83-80ac-112b-d732-ef84cef8b692","queryParams": [],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [],"dataMode": "raw","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564583093792,"name": "/json/params1-body no","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": [],"rawModeData": "{\n\t\"id\":\"test\",\n\t\"msg\":\"testmsg\"\n}"},{"id": "317dfa64-1b31-e0b9-b9b0-50e7430455ee","headers": "Content-Type: application/json\n","headerData": [{"key": "Content-Type","value": "application/json","description": "","enabled": true}],"url": "http://localhost:8080/json/paramsobject?name=name&age=34","folder": "1759fa83-80ac-112b-d732-ef84cef8b692","queryParams": [{"key": "name","value": "name","equals": true,"description": "","enabled": true},{"key": "age","value": "34","equals": true,"description": "","enabled": true}],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [],"dataMode": "raw","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564583810467,"name": "/paramsobject-url ok","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": [],"rawModeData": "{\n\t\"name\":\"test\",\n\t\"age\":11\n}"},{"id": "687c99c6-75b5-6c17-b93a-da10735a14dc","headers": "Content-Type: application/json\n","headerData": [{"key": "Content-Type","value": "application/json","description": "","enabled": true}],"url": "http://localhost:8080/multipart/paramsobject1","folder": "70d362df-168c-a821-3b29-cac943e77301","queryParams": [],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [{"key": "name","value": "dd","description": "","type": "text","enabled": true},{"key": "age","value": "444","description": "","type": "text","enabled": true}],"dataMode": "params","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564584249114,"name": "/paramsobject1-body no","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": []},{"id": "7060e912-d5d0-1731-9385-ce25fd0e88ff","headers": "Content-Type: application/x-www-form-urlencoded\n","headerData": [{"key": "Content-Type","value": "application/x-www-form-urlencoded","description": "","enabled": true}],"url": "http://localhost:8080/form/paramsobject","folder": "74f0c28e-dbc8-969d-f173-6864fb2acfa8","queryParams": [],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [{"key": "name","value": "张三","description": "","type": "text","enabled": true},{"key": "age","value": "14","description": "","type": "text","enabled": true}],"dataMode": "urlencoded","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564582834878,"name": "/form/paramsobject-body ok","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": []},{"id": "790f2d92-7482-de03-3fc1-56ae53635471","headers": "Content-Type: application/x-www-form-urlencoded\n","headerData": [{"key": "Content-Type","value": "application/x-www-form-urlencoded","description": "","enabled": true}],"url": "http://localhost:8080/form/paramsobject?name=dddd&age=44","folder": "74f0c28e-dbc8-969d-f173-6864fb2acfa8","queryParams": [{"key": "name","value": "dddd","equals": true,"description": "","enabled": true},{"key": "age","value": "44","equals": true,"description": "","enabled": true}],"preRequestScript": 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true}],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [],"dataMode": "params","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564584016104,"name": "/params-url ok","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": []},{"id": "e90f5a7b-e924-131e-0b2a-0dd6a467c222","headers": "Content-Type: application/json\n","headerData": [{"key": "Content-Type","value": "application/json","description": "","enabled": true}],"url": "http://localhost:8080/multipart/paramsobject","folder": "70d362df-168c-a821-3b29-cac943e77301","queryParams": [],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [{"key": "name","value": "dd","description": "","type": "text","enabled": true},{"key": "age","value": "11","description": "","type": "text","enabled": true}],"dataMode": "params","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564584163217,"name": "/paramsobject-body no","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": []},{"id": "f905ac7b-953a-88c7-00b2-d8b936be4207","headers": "Content-Type: application/x-www-form-urlencoded\n","headerData": [{"key": "Content-Type","value": "application/x-www-form-urlencoded","description": "","enabled": true}],"url": "http://localhost:8080/form/paramsobject1?name=dddd&age=44","folder": "74f0c28e-dbc8-969d-f173-6864fb2acfa8","queryParams": [{"key": "name","value": "dddd","equals": true,"description": "","enabled": true},{"key": "age","value": "44","equals": true,"description": "","enabled": true}],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [],"dataMode": "urlencoded","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564582819307,"name": "/form/paramsobject1-url no","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": []},{"id": "fb811f2b-03b1-23b3-3077-5c56edf8a030","headers": "Content-Type: application/json\n","headerData": [{"key": "Content-Type","value": "application/json","description": "","enabled": true}],"url": "http://localhost:8080/json/paramsobject","folder": "1759fa83-80ac-112b-d732-ef84cef8b692","queryParams": [],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [],"dataMode": "raw","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564583824765,"name": "/paramsobject-body no","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": [],"rawModeData": "{\n\t\"name\":\"test\",\n\t\"age\":11\n}"},{"id": "fc04a41c-6123-d2ce-81f1-96ec54989acc","headers": "","headerData": [],"url": "http://localhost:8080/multipart/params","folder": "70d362df-168c-a821-3b29-cac943e77301","queryParams": [],"preRequestScript": null,"pathVariables": {},"pathVariableData": [],"method": "POST","data": [{"key": "id","value": "sss","description": "","type": "text","enabled": true},{"key": "msg","value": "ddd","description": "","type": "text","enabled": true}],"dataMode": "params","tests": null,"currentHelper": "normal","helperAttributes": {},"time": 1564584036668,"name": "/params-body no","description": "","collectionId": "a8b343a0-434d-0f97-0757-65cc1e9591b7","responses": []}]
}

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1.3、其他针对

　　spring的requestbody，requestparam等参看 012-Spring Boot web【一】web项目搭建、请求参数、RestController、使用jsp、freemarker，web容器tomcat和jetty

二、常用http client 介绍

　　常用客户端模板：RestTemplate、

　　常用客户端：jdk的HttpURLConnection、apache的httpClient、okhttp3等

2.1、连接模板RestTemplate

　　RestTemplate是spring的一个rest客户端，在spring-web这个包下.

　　RestTemplate只是对其它Rest客户端的一个封装，本身并没有自己的实现。只不过里面添加了默认实现

　　在ClientHttpRequestFactory的实现那张图中列出了RestTemplate的几种REST Client的封装。在没有第三方依赖的情况下其默认实现是URLConnection。　　

　　　　

常用的有以下三种：

　　SimpleClientHttpRequestFactory（封装URLConnection）

　　HttpComponentsClientHttpRequestFactory（封装HttpClient）

　　OkHttp3ClientHttpRequestFactory(封装OKHttp)

2.2.1、SimpleClientHttpRequestFactory使用【模式实现】

    @Testpublic void noparam() {RestTemplate restTemplate = new RestTemplate(new SimpleClientHttpRequestFactory());// new RestTemplate(); 等价于 new RestTemplate(new SimpleClientHttpRequestFactory());String s = restTemplate.postForObject("http://localhost:8080/form/noparam", null, String.class);System.out.println(s);}

2.2.1、HttpComponentsClientHttpRequestFactory使用

pom依赖

<dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.6</version>
</dependency>

如果没有pom导入apache httpclient使用下属会报错

    @Testpublic void noparam2() {RestTemplate restTemplate = new RestTemplate(new HttpComponentsClientHttpRequestFactory());String s = restTemplate.postForObject("http://localhost:8080/form/noparam", null, String.class);System.out.println(s);}

2.2.1、OkHttp3ClientHttpRequestFactory使用

pom依赖

        <dependency><groupId>com.squareup.okhttp3</groupId><artifactId>okhttp</artifactId><version>4.0.0</version></dependency>

代码

    @Testpublic void noparam3() {RestTemplate restTemplate = new RestTemplate(new OkHttp3ClientHttpRequestFactory());String s = restTemplate.postForObject("http://localhost:8080/form/noparam", null, String.class);System.out.println(s);}

由上述可见RestTemplate规避了底层实现。

一般选用一种httpclient实现即可

2.2、okhttp3使用

2.3、apache的httpclient使用

三、Http连接池

有限资源使用，就需要连接池

如果不复用连接池，会有多少发多少，浪费资源以及拖垮机器

3.1、RestTemplate配合实现端连接池

3.1.1、结合SimpleClientHttpRequestFactory

　　没有连接池实现，但是可以增加配置参数

    @Testpublic void SimpleClientHttpRequestFactoryPool() {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 restTemplate = new RestTemplate(messageConverters);restTemplate.setRequestFactory(requestFactory);restTemplate.setErrorHandler(new DefaultResponseErrorHandler());String s = restTemplate.postForObject("http://localhost:8080/form/noparam", null, String.class);System.out.println(s);}

View Code

sdf

3.1.2、结合Httpclient连接池的方式【推荐】

可以通过xml或者java类bean方式

spring xml

    <!--使用httpclient的实现，带连接池--><!--在httpclient4.3版本后才有--><bean id="httpClientBuilder" class="org.apache.http.impl.client.HttpClientBuilder" factory-method="create"><property name="connectionManager"><bean class="org.apache.http.impl.conn.PoolingHttpClientConnectionManager"><!--整个连接池的并发--><property name="maxTotal" value="50"/><!--每个主机的并发--><property name="defaultMaxPerRoute" value="50"/></bean></property><!--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="Content-Type"/><constructor-arg value="text/html;charset=UTF-8"/></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="httpClient" factory-bean="httpClientBuilder" factory-method="build"/><bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
<!--        <property name="messageConverters">-->
<!--            <list value-type="org.springframework.http.converter.HttpMessageConverter">-->
<!--                <bean class="org.springframework.http.converter.StringHttpMessageConverter">-->
<!--                    <property name="supportedMediaTypes">-->
<!--                        <value>text/html;charset=UTF-8</value>-->
<!--                    </property>-->
<!--                </bean>-->
<!--                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">-->
<!--                    <property name="supportedMediaTypes">-->
<!--                        <value>application/json;charset=UTF-8</value>-->
<!--                    </property>-->
<!--                </bean>-->
<!--                <bean class="org.springframework.http.converter.ResourceHttpMessageConverter"/>-->
<!--                <bean class="org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter"/>-->
<!--                <bean class="org.springframework.http.converter.FormHttpMessageConverter"/>-->
<!--                <bean class="org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter"/>-->
<!--            </list>-->
<!--        </property>--><property name="requestFactory"><bean class="org.springframework.http.client.HttpComponentsClientHttpRequestFactory"><constructor-arg ref="httpClient"/><!--连接时间(毫秒)--><property name="connectTimeout" value="20000"/><!--读取时间(毫秒)--><property name="readTimeout" value="20000"/></bean></property></bean>

View Code

java代码

@Configuration
public class RestTemplateUtil{@Beanpublic RestTemplate restTemplate(RestTemplateBuilder builder) {RestTemplate restTemplate = builder.build();restTemplate.setRequestFactory(clientHttpRequestFactory()); // 使用 utf-8 编码集的 conver 替换默认的 conver（默认的 string conver 的编码集为"ISO-8859-1"）List<HttpMessageConverter<?>> messageConverters = restTemplate.getMessageConverters();Iterator<HttpMessageConverter<?>> iterator = messageConverters.iterator();while (iterator.hasNext()) {HttpMessageConverter<?> converter = iterator.next();if (converter instanceof StringHttpMessageConverter) {iterator.remove();}}messageConverters.add(new StringHttpMessageConverter(Charset.forName("UTF-8")));return restTemplate;}@Beanpublic HttpClientConnectionManager poolingConnectionManager() {PoolingHttpClientConnectionManager poolingConnectionManager = new PoolingHttpClientConnectionManager();poolingConnectionManager.setMaxTotal(1000); // 连接池最大连接数  poolingConnectionManager.setDefaultMaxPerRoute(100); // 每个主机的并发return poolingConnectionManager;}@Beanpublic HttpClientBuilder httpClientBuilder() {HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();//设置HTTP连接管理器
    httpClientBuilder.setConnectionManager(poolingConnectionManager());return httpClientBuilder;}@Beanpublic ClientHttpRequestFactory clientHttpRequestFactory() { HttpComponentsClientHttpRequestFactory clientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory();clientHttpRequestFactory.setHttpClient(httpClientBuilder().build());clientHttpRequestFactory.setConnectTimeout(6000); // 连接超时，毫秒        clientHttpRequestFactory.setReadTimeout(6000); // 读写超时，毫秒        return clientHttpRequestFactory;}
}

View Code

其中注意

  • maxTotal 是整个连接池的最大连接数
  • defaultMaxPerRoute 是每个route默认的最大连接数【可以理解为每个url同时请求数】
  • setMaxPerRoute(final HttpRoute route, final int max) route的最大连接数，优先于defaultMaxPerRoute。

//defaultMaxPerRoute默认为2，maxTotal默认为20

测试一

　　服务端处理逻辑 3s

　　http连接池：maxTotal=50，defaultMaxPerRoute=50

　　客户端 100个并发请求，分析：约6s执行完毕

    @Autowiredprivate RestTemplate restTemplate;@Testpublic void HttpComponentsClientHttpRequestFactoryPool() throws Exception {List<Future<String>> list=new ArrayList<Future<String>>();long start = System.currentTimeMillis();ExecutorService fixedThreadPool = Executors.newFixedThreadPool(100);for (int i = 0; i < 100; i++) {Future<String> submit = fixedThreadPool.submit(() -> {String s = restTemplate.postForObject("http://localhost:8080/form/noparam", null, String.class);return s;});list.add(submit);}fixedThreadPool.shutdown();System.out.println("装载耗时：" + (System.currentTimeMillis() - start) + "ms");System.out.println("个数：" + list.size());for (Future<String> future : list) {System.out.println(future.get());}System.out.println("回调耗时：" + (System.currentTimeMillis() - start) + "ms");}

View Code

　　输出：

装载耗时：17ms
个数：100
{"code":"2000"}
//……
{"code":"2000"}
总计执行完毕耗时：6200ms

测试二

　　服务端处理逻辑 3s

　　http连接池：maxTotal=50，defaultMaxPerRoute=25

　　客户端 100个并发请求，，分析：约12s执行完毕

装载耗时：28ms
个数：100
{"code":"2000"}
//……
{"code":"2000"}
总计执行完毕耗时：12236ms

3.1.3、结合okhttp3连接池的方式

研究中

3.2、小结

　　jdk：RestTemplate restTemplate = new RestTemplate(new SimpleClientHttpRequestFactory()); 没有连接池，受服务端连接数限制【如tomcat默认200】，以及客户端请求限制

　　apache：RestTemplate restTemplate = new RestTemplate(new HttpComponentsClientHttpRequestFactory()); 不配置默认5个，需配置，但也受服务端连接数限制【如tomcat默认200】，以及客户端请求限制

　　okhttp3：RestTemplate restTemplate = new RestTemplate(new OkHttp3ClientHttpRequestFactory());没有配置连接池，受服务端连接数限制【如tomcat默认200】，以及客户端请求限制

fsd

转载于:https://www.cnblogs.com/bjlhx/p/11282500.html

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