流量网站怎么做的,如何做好网站设计,湘潭找个人做网站的,2019怎么做网站赚钱HttpClient Get/Post方式调用Http接口 本节摘要:本节主要分别介绍如何用get方式、post方式向http接口发送数据。 preparation 1. 项目环境如下#xff1a; myeclipse6.5 、tomcat5.0、system:xp、JDK:开发1.5#xff0c;编译1.4 为了方便,在原来的web项目UpDown中新建了一个h… HttpClient Get/Post方式调用Http接口 本节摘要:本节主要分别介绍如何用get方式、post方式向http接口发送数据。 preparation 1. 项目环境如下 myeclipse6.5 、tomcat5.0、system:xp、JDK:开发1.5编译1.4 为了方便,在原来的web项目UpDown中新建了一个httpcall包用来保存http接口和调用的客户端。 2.准备需要的jar包 * commons-httpclient-3.0.jar * commons-logging.jar * commons-codec-1.3.jar 3.classmethod HttpClient GetMethod PostMethod start 接口写了一个servlet来接收客户端get/post的请求 web.xml需要加入以下配置 !-- 模拟HTTP的调用写的一个http接口 -- servlet servlet-nameTestHTTPServer/servlet-name servlet-classhttpcall.TestHTTPServer/servlet-class /servlet servlet-mapping servlet-nameTestHTTPServer/servlet-name url-pattern/httpServer/url-pattern /servlet-mapping TestHTTPServer.java的代码如下: TestHTTPServerpackage httpcall; import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; /** *Module: TestHTTPServer.java *Description: 为了验证http接口的调用编写了一个模拟的http接口 *Company: *Author: ptp *Date: Feb 22, 2012 */ public class TestHTTPServer extends HttpServlet{ private static final long serialVersionUID 1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding(gbk); PrintWriter out response.getWriter(); String param1 request.getParameter(param1); out.println(param1 param1); String param2 request.getParameter(param2); out.println(param2 param2); if (param1 null || .equals(param1) || param1.length() 0) { out.println(http call failed,参数param1不能为空,程序退出); } else if (param2 null || .equals(param2) || param2.length() 0) { out.println(http call failed,参数param2不能为空,程序退出); } else { out.println(---http call success---); } out.close(); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); }} HttpClientUtil.java的代码如下 HttpClientUtilpackage httpcall; import java.io.IOException;import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;//import org.apache.commons.httpclient.Header;import org.apache.commons.httpclient.HttpClient;import org.apache.commons.httpclient.HttpException;//import org.apache.commons.httpclient.HttpStatus;import org.apache.commons.httpclient.methods.GetMethod;import org.apache.commons.httpclient.methods.PostMethod;import org.apache.commons.httpclient.params.HttpMethodParams;//import org.apache.commons.httpclient.NameValuePair;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory; /** * *Module: HttpClientUtil.java *Description: 以get/post的方式发送数据到指定的http接口---利用httpclient.jar包---HTTP接口的调用 *Company: *Author: ptp *Date: Feb 22, 2012 */ public class HttpClientUtil { private static final Log log LogFactory .getLog(HttpClientUtil.class); /** * get方式 * param param1 * param param2 * return*/ public static String getHttp(String param1,String param2){ String responseMsg ; // 1.构造HttpClient的实例 HttpClient httpClient new HttpClient(); // 用于测试的http接口的url String urlhttp://localhost:8080/UpDown/httpServer?param1param1param2param2; // 2.创建GetMethod的实例 GetMethod getMethod new GetMethod(url); // 使用系统系统的默认的恢复策略 getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler()); try { //3.执行getMethod,调用http接口 httpClient.executeMethod(getMethod); //4.读取内容 byte[] responseBody getMethod.getResponseBody(); //5.处理返回的内容 responseMsg new String(responseBody); log.info(responseMsg); } catch (HttpException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); }finally{ //6.释放连接 getMethod.releaseConnection(); } return responseMsg; } /** * post方式 * param param1 * param param2 * return*/ public static String postHttp(String param1,String param2) { String responseMsg ; //1.构造HttpClient的实例 HttpClient httpClientnew HttpClient(); httpClient.getParams().setContentCharset(GBK); String urlhttp://localhost:8080/UpDown/httpServer; //2.构造PostMethod的实例 PostMethod postMethodnew PostMethod(url); //3.把参数值放入到PostMethod对象中//方式1/* NameValuePair[] data { new NameValuePair(param1, param1), new NameValuePair(param2, param2) }; postMethod.setRequestBody(data);*/ //方式2 postMethod.addParameter(param1, param1); postMethod.addParameter(param2, param2); try { // 4.执行postMethod,调用http接口 httpClient.executeMethod(postMethod);//200//5.读取内容 responseMsg postMethod.getResponseBodyAsString().trim(); log.info(responseMsg); //6.处理返回的内容 } catch (HttpException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { //7.释放连接 postMethod.releaseConnection(); } return responseMsg; } /** * 测试的main方法 * param args*/ public static void main(String[] args) { String param1111; String param2222; //get// System.out.println(get方式调用http接口\ngetHttp(param1, param2));//post System.out.println(post方式调用http接口\npostHttp(param1,param2)); }} result 在HttpClientUtil运行main方法分别运行以下几种情况 1.get方式 设置 String param1111; String param2222; 运行get方式截图如下 设置 String param1111; String param2; 运行get方式截图如下 2.post方式 设置 String param1111; String param2222; 运行post方式截图如下 设置 String param1111; String param2; 运行post方式截图如下 通过get和post方式调用http接口总结如下: * get方式调用http接口的步骤 * 1.构造HttpClient实例 * 2.构造GetMethod实例 * 3.执行getMethod,调用http接口 * 4.读取内容 * 5.处理返回的内容 * 6.释放连接 * * post方式调用http接口的步骤 * 1.构造HttpClient实例 * 2.构造PostMethod实例 * 3.把参数值放入到PostMethod对象中 * 方式1:利用NameValuePair类 * 方式2:直接用PostMethod实例对象的addParameter方法 * 4.执行postMethod,调用http接口 * 5.读取内容 * 6.处理返回的内容 * 7.释放连接 posted on 2016-04-19 14:00 牧少 阅读(...) 评论(...) 编辑 收藏 转载于:https://www.cnblogs.com/lhfyy/p/5407954.html
