Java編程之通過HttpClient發送HTTP請求

HttpClient時著名的開源軟件組織Apache基金會下的一個子項目，它對HTTP協議通信的過程進行了封裝，提供高效且功能豐富的客戶端編程工具包。

package cn.com.cis.claim.car.interf.common.service.facade;

public interface HttpClientService {
    /**
     * HttpServlet+XML交互發送報文
     * chengjie 2017-12-14
     * @param strURL
     * @param requestXML
     * @return String 返回報文
     */
    public String postMethod(String strURL, String requestXML);
}

package cn.com.cis.claim.car.interf.common.service.spring;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.StringRequestEntity;
import org.apache.commons.httpclient.params.HttpConnectionManagerParams;

import cn.com.cis.claim.car.interf.common.service.facade.HttpClientService;

public class HttpClientServiceSpringImpl implements HttpClientService {
    
    public String postMethod(String strURL, String requestXML) {
        StringBuffer buffer = new StringBuffer();
        String strResponse = "";
        PostMethod postMethod = null;
        HttpClient httpClient = new HttpClient();

        HttpConnectionManagerParams managerParams = httpClient.getHttpConnectionManager().getParams();

        int intCICONNECTTIME = Integer.parseInt("120000"); // 連接超時時間(單位毫秒)
        int intSoTimeout = Integer.parseInt("180000"); // 連接讀數據超時時間(單位毫秒)
        managerParams.setConnectionTimeout(intCICONNECTTIME); // 設置連接超時時間(單位毫秒)
        managerParams.setSoTimeout(intSoTimeout); // 設置讀數據超時時間(單位毫秒)＝連接超時時間+1分鍾

        System.out.println("********************************");
        System.out.println("訪問地址" + strURL);
        System.out.println("********************************");
        BufferedReader reader = null;
        try {
            System.out.println("---------->進入try");
            System.out.println("strURL-------->" + strURL);
            postMethod = new PostMethod(strURL);
            System.out.println("---------->postMethod");
            postMethod.setRequestEntity(new StringRequestEntity(requestXML, "text/xml", "GBK"));
            int statusCode = httpClient.executeMethod(postMethod);
            System.out.println("statusCode-------->" + statusCode);
            if (statusCode != HttpStatus.SC_OK) {
                throw new IllegalStateException("Method failed: " + postMethod.getStatusLine());
            }

            reader = new BufferedReader(new InputStreamReader(postMethod.getResponseBodyAsStream()));
            System.out.println("reader--------->" + reader);
            while ((strResponse = reader.readLine()) != null) {
                buffer.append(strResponse);
            }

        } catch (Exception ex) {
            throw new RuntimeException("發送數據出錯，請聯系管理員！");
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            postMethod.releaseConnection();

        }
        return buffer.toString();
    }
}

 從Servlet中獲取bean

public void init() throws ServletException {
           claimInfoQueryService = (ClaimInfoQueryService)ServiceFactory.getService(this.getServletContext(),"claimInfoQueryService");
     }