【SSM分布式架構電商項目-15】Httpclient提供者服務

對外的介面服務

我們把上一篇：【SSM分布式架構電商項目-14】後台CMS內容管理系統管理前台首頁廣告裡面的ContentController拷貝到api包下，對外提供介面服務：

package com.taotao.manage.controller.api;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.http.HttpStatus;import org.springframework.http.ResponseEntity;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import com.taotao.common.bean.EasyUIResult;import com.taotao.manage.service.ContentService;@RequestMapping("api/content")@Controllerpublic class ApiContentController {    @Autowired    private ContentService contentService;    /**     *  根據內容分類id查詢分類列表     *       * @param categoryId     * @param page     * @param rows     * @return     */    @RequestMapping(method = RequestMethod.GET)    public ResponseEntity<EasyUIResult> queryListByCategoryId(@RequestParam("categoryId") Long categoryId,            @RequestParam(value = "page", defaultValue = "1") Integer page,            @RequestParam(value = "rows", defaultValue = "10") Integer rows) {        try {            EasyUIResult easyUIResult = this.contentService.queryListByCategoryId(categoryId, page, rows);            return ResponseEntity.ok(easyUIResult);        } catch (Exception e) {            e.printStackTrace();        }        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(null);    }}

測試：
提供者服務的方式

方式有2種：
1、 js訪問
a) 有跨域 – jsonp解決
b) 無跨域 – ajax解決
2、 Java代碼訪問
a) Httpclient Httpclient

匯入依賴

DoGET

package cn.itcast.httpclient;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;public class DoGET {    public static void main(String[] args) throws Exception {        // 建立Httpclient對象        CloseableHttpClient httpclient = HttpClients.createDefault();        // 建立http GET請求        HttpGet httpGet = new HttpGet("http://www.baidu.com/s?wd=java");        CloseableHttpResponse response = null;        try {            // 執行請求            response = httpclient.execute(httpGet);            // 判斷返回狀態是否為200            if (response.getStatusLine().getStatusCode() == 200) {                String content = EntityUtils.toString(response.getEntity(), "UTF-8");                System.out.println("內容："+content);            }        } finally {            if (response != null) {                response.close();            }            httpclient.close();        }    }}

帶有參數的GET請求

package cn.itcast.httpclient;import java.net.URI;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.utils.URIBuilder;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;public class DoGETParam {    public static void main(String[] args) throws Exception {        // 建立Httpclient對象        CloseableHttpClient httpclient = HttpClients.createDefault();        // 定義請求的參數        URI uri = new URIBuilder("http://manage.taotao.com/rest/api/content").setParameter("categoryId", "33")                .setParameter("page", "1").setParameter("rows", "1").build();        System.out.println(uri);        // 建立http GET請求        HttpGet httpGet = new HttpGet(uri);        CloseableHttpResponse response = null;        try {            // 執行請求            response = httpclient.execute(httpGet);            // 判斷返回狀態是否為200            if (response.getStatusLine().getStatusCode() == 200) {                String content = EntityUtils.toString(response.getEntity(), "UTF-8");                System.out.println(content);            }        } finally {            if (response != null) {                response.close();            }            httpclient.close();        }    }}

DoPOST

package cn.itcast.httpclient;import java.util.ArrayList;import java.util.List;import org.apache.http.NameValuePair;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;public class DoPOSTParam {    public static void main(String[] args) throws Exception {        // 建立Httpclient對象        CloseableHttpClient httpclient = HttpClients.createDefault();        // 建立http POST請求        HttpPost httpPost = new HttpPost("http://www.oschina.net/search");        // 偽裝成瀏覽器        httpPost.setHeader(                "User-Agent",                "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.94 Safari/537.36");        // 設定2個post參數，一個是scope、一個是q        List<NameValuePair> parameters = new ArrayList<NameValuePair>(0);        parameters.add(new BasicNameValuePair("scope", "project"));        parameters.add(new BasicNameValuePair("q", "java"));        parameters.add(new BasicNameValuePair("fromerr", "7nXH76r7"));        // 構造一個form表單式的實體        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters);        // 將請求實體設定到httpPost對象中        httpPost.setEntity(formEntity);        CloseableHttpResponse response = null;        try {            // 執行請求            response = httpclient.execute(httpPost);            // 判斷返回狀態是否為200            if (response.getStatusLine().getStatusCode() == 200) {                String content = EntityUtils.toString(response.getEntity(), "UTF-8");                System.out.println(content);            }        } finally {            if (response != null) {                response.close();            }            httpclient.close();        }    }}

帶有參數的POST請求

 public static void main(String[] args) throws Exception {        // 建立Httpclient對象        CloseableHttpClient httpclient = HttpClients.createDefault();        // 建立http POST請求        HttpPost httpPost = new HttpPost("http://www.oschina.net/search");     // 偽裝成瀏覽器        httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.94 Safari/537.36");        // 設定2個post參數，一個是scope、一個是q        List<NameValuePair> parameters = new ArrayList<NameValuePair>(0);        parameters.add(new BasicNameValuePair("scope", "project"));        parameters.add(new BasicNameValuePair("q", "java"));        parameters.add(new BasicNameValuePair("fromerr", "7nXH76r7"));        // 構造一個form表單式的實體        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters);        // 將請求實體設定到httpPost對象中        httpPost.setEntity(formEntity);         CloseableHttpResponse response = null;        try {            // 執行請求            response = httpclient.execute(httpPost);            // 判斷返回狀態是否為200            if (response.getStatusLine().getStatusCode() == 200) {                String content = EntityUtils.toString(response.getEntity(), "UTF-8");                System.out.println(content);            }        } finally {            if (response != null) {                response.close();            }            httpclient.close();        }    }

連線管理員

注意：

package cn.itcast.httpclient;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.conn.HttpClientConnectionManager;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;import org.apache.http.util.EntityUtils;public class HttpConnectManager {    public static void main(String[] args) throws Exception {        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();        // 設定最大串連數        cm.setMaxTotal(200);        // 設定每個主機地址的並發數        cm.setDefaultMaxPerRoute(20);        doGet(cm);        doGet(cm);    }    public static void doGet(HttpClientConnectionManager cm) throws Exception {        CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(cm).build();        // 建立http GET請求        HttpGet httpGet = new HttpGet("http://www.baidu.com/");        CloseableHttpResponse response = null;        try {            // 執行請求            response = httpClient.execute(httpGet);            // 判斷返回狀態是否為200            if (response.getStatusLine().getStatusCode() == 200) {                String content = EntityUtils.toString(response.getEntity(), "UTF-8");                System.out.println("內容長度：" + content.length());            }        } finally {            if (response != null) {                response.close();            }            // 此處不能關閉httpClient，如果關閉httpClient，串連池也會銷毀            // httpClient.close();        }    }}

定期關閉無效串連

public class ClientEvictExpiredConnections {    public static void main(String[] args) throws Exception {        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();        // 設定最大串連數        cm.setMaxTotal(200);        // 設定每個主機地址的並發數        cm.setDefaultMaxPerRoute(20);        new IdleConnectionEvictor(cm).start();    }    public static class IdleConnectionEvictor extends Thread {        private final HttpClientConnectionManager connMgr;        private volatile boolean shutdown;        public IdleConnectionEvictor(HttpClientConnectionManager connMgr) {            this.connMgr = connMgr;        }        @Override        public void run() {            try {                while (!shutdown) {                    synchronized (this) {                        wait(5000);                        // 關閉失效的串連                        connMgr.closeExpiredConnections();                    }                }            } catch (InterruptedException ex) {                // 結束            }        }        public void shutdown() {            shutdown = true;            synchronized (this) {                notifyAll();            }        }    }}

佈建要求參數

Httpclient和Spring的整合

<beans xmlns="http://www.springframework.org/schema/beans"    xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"    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-4.0.xsd    http://www.springframework.org/schema/context http