HttpComponents 發送post get 請求

1.場景描述

　　使用Apache開源組織中的HttpComponents，完成對http服務器的訪問功能，消息體xml報文。

2.HttpComponents項目的介紹

　　HttpComponents項目就是專門設計來簡化HTTP客戶端與服務器進行各種通訊編程。通過它可以讓原來很頭疼的事情現在輕松的解決，例如你不再管是HTTP或者HTTPS的通訊方式，告訴它你想使用HTTPS方式，剩下的事情交給 httpclient替你完成。

3.maven依賴　

<dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.3.1</version>
</dependency>

 4.代碼編寫

工具類

import org.apache.http.HttpEntity;
import org.apache.http.HttpHeaders;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import javax.net.ssl.KeyManager;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.IOException;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

/**
 *  apache httpclient 工具類
 *  支持對 http https 接口調用
 *  <P>
 *      1.GET 請求
 *      2.POST 請求
 *  </P>
 */
public class HttpDelegate {
    private int timeOut = 10000;//指定超時時間
    private CloseableHttpClient httpClient;
    private RequestConfig requestConfig;//設置請求參數

    /**
     * 對象被創建時執行
     */
    public HttpDelegate(Boolean isHttps){
        httpClient = this.getHttpClient(isHttps);
        this.initRequestConfig();//初始化請求配置
    }

    /**
     * 發送post請求
     * @param url 請求地址
     * @param contentType 請求類型
     * @param encoding 編碼格式
     * @param param 請求參數
     * @return
     */
    public String executePost(String url,String contentType,String encoding,String param)
    {
        HttpPost httpPost = new HttpPost(url);
        try {
            httpPost.setConfig(requestConfig);
            this.initMethodParam(httpPost, contentType, encoding);
            if(param!=null)
            {
                httpPost.setEntity(new StringEntity(param, encoding));//設置請求體
            }
            return this.execute(httpPost,httpClient);
        }
        catch (Exception e)
        {
            throw new RuntimeException(e.getMessage(), e);
        }
        finally
        {
            httpPost.releaseConnection();
        }
    }

    /**
     * 發送get請求
     * @param url 請求地址
     * @param contentType 請求類型
     * @param encoding 編碼格式
     * @return
     */
    public String executeGet(String url,String contentType,String encoding){
        HttpGet httpGet = new HttpGet(url);
        try{
            httpGet.setConfig(requestConfig);
            this.initMethodParam(httpGet, contentType, encoding);
            return this.execute(httpGet,httpClient);
        }catch (Exception e){
            throw new RuntimeException(e.getMessage(),e);
        }finally{
            httpGet.releaseConnection();
        }
    }
    /**
     * 通用方法，用來發送post或get請求
     * @param method 請求類型
     * @param httpClient
     * @return
     * @throws RuntimeException
     * @throws IOException
     */
    private String execute(HttpUriRequest method,CloseableHttpClient httpClient) throws RuntimeException,IOException{
        CloseableHttpResponse response = null;
        try{
            response = httpClient.execute(method);
            HttpEntity entity = response.getEntity();
            return EntityUtils.toString(entity, method.getFirstHeader(HttpHeaders.CONTENT_ENCODING).getValue());
        }catch (Exception e){
            throw new RuntimeException(e.getMessage(), e);
        }finally{
            if(response != null){
                response.close();
            }
        }
    }

    private void initMethodParam(HttpUriRequest method, String contentType, String encoding){
        if (contentType != null){
            method.setHeader(HttpHeaders.CONTENT_TYPE, contentType);
        }
        method.setHeader(HttpHeaders.CONTENT_ENCODING, encoding);
        method.setHeader(HttpHeaders.TIMEOUT, "60000");
    }

    /**
     * 設置初始值
     */
    private void initRequestConfig() {
        requestConfig=RequestConfig.custom().setSocketTimeout(timeOut).setConnectTimeout(timeOut).build();
    }

    /**
     * 獲取主體類:
     * isHttps 區分https 和 https
     * @param isHttps
     * @return
     */
    private CloseableHttpClient getHttpClient(boolean isHttps) {
        CloseableHttpClient chc = null;
        try{
            if (isHttps){
                TrustManager[] trustManagers = new TrustManager[1];
                trustManagers[0] = new X509TrustManager(){
                    public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException{}
                    public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException{}
                    public X509Certificate[] getAcceptedIssuers(){
                        return null;
                    }
                };
                SSLContext sslContext = SSLContext.getInstance("TLS");
                sslContext.init(new KeyManager[0], trustManagers, new SecureRandom());
                SSLContext.setDefault(sslContext);
                sslContext.init(null, trustManagers, null);
                SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
                chc = HttpClients.custom().setSSLSocketFactory(sslsf).build();
            }else{
                chc=HttpClients.custom().build();
            }
        }catch (Exception e){
            throw new RuntimeException(e.getMessage(), e);
        }
        return chc;
    }

    /**
     * 關閉鏈接
     */
    public void destroy(){
        System.out.println("方法被執行");
        try{
            httpClient.close();
        }catch (IOException e){
            throw new RuntimeException(e.getMessage(),e);
        }
    }
}

服務端接口

@RequestMapping(value="/txp/test.action",method= RequestMethod.POST)
    public void testHttpPost(HttpServletRequest request, HttpServletResponse response) throws Exception{
        //解析請求報文
        request.setCharacterEncoding("UTF-8");         //返回頁面防止出現中文亂碼
        BufferedReader reader = new BufferedReader(new InputStreamReader(request.getInputStream()));//post方式傳遞讀取字符流
        String jsonStr = null;
        StringBuilder sb = new StringBuilder();
        try {
            while ((jsonStr = reader.readLine()) != null) {
                sb.append(jsonStr);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        reader.close();// 關閉輸入流
        System.out.println("請求報文:"+sb.toString());
        String result = "true";
        response.getWriter().print(result);
    }

測試方法

@Test
    public void test(){
        //組裝回調參數
        StringBuilder sb = new StringBuilder();
        sb.append("<?xml version=\"1.0\"?>");
        sb.append("<root>");
        sb.append("<param1>").append("hello word").append("</param1>");
        sb.append("<param2>").append("!").append("</param2>");
        sb.append("</root>");

        //開始進行回調
        log.info("回調信息,{}",sb.toString());
        String responseBody =  hd.executePost("http://localhost:7082/ecurrency-cardtransfer/txp/test.action", "text/xml", "GBK", sb.toString());
        System.out.println("返回信息："+responseBody);
    }