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.class&method
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：

    <servlet>
        <servlet-name>TestHTTPServer</servlet-name>
        <servlet-class>httpcall.TestHTTPServer</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>TestHTTPServer</servlet-name>
        <url-pattern>/httpServer</url-pattern>
    </servlet-mapping>

TestHTTPServer.java的代码如下:

TestHTTPServer
1 package httpcall;
2
3 import java.io.IOException;
4 import java.io.PrintWriter;
5 import javax.servlet.ServletException;
6 import javax.servlet.http.HttpServlet;
7 import javax.servlet.http.HttpServletRequest;
8 import javax.servlet.http.HttpServletResponse;
9
10 /**
11 *Module:       TestHTTPServer.java
12 *Description: 为了验证http接口的调用，编写了一个模拟的http接口
13 *Company:
14 *Author:       ptp
15 *Date:         Feb 22, 2012
16 */
17
18 public class TestHTTPServer extends HttpServlet{
19
20     private static final long serialVersionUID = 1L;
21
22     public void doGet(HttpServletRequest request, HttpServletResponse response)
23             throws ServletException, IOException {
24         response.setCharacterEncoding("gbk");
25
26         PrintWriter out = response.getWriter();
27         String param1 = request.getParameter("param1");
28         out.println("param1=" + param1);
29         String param2 = request.getParameter("param2");
30         out.println("param2=" + param2);
31         if (param1 == null || "".equals("param1") || param1.length() <= 0) {
32             out.println("http call failed,参数param1不能为空,程序退出");
33         } else if (param2 == null || "".equals("param2")
34                 || param2.length() <= 0) {
35             out.println("http call failed,参数param2不能为空,程序退出");
36         } else {
37             out.println("---http call success---");
38         }
39         out.close();
40     }
41
42     public void doPost(HttpServletRequest request, HttpServletResponse response)
43             throws ServletException, IOException {
44         this.doGet(request, response);
45     }
46 }

HttpClientUtil.java的代码如下：
HttpClientUtil
1 package httpcall;
2
3 import java.io.IOException;
4 import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
5 //import org.apache.commons.httpclient.Header;
6 import org.apache.commons.httpclient.HttpClient;
7 import org.apache.commons.httpclient.HttpException;
8 //import org.apache.commons.httpclient.HttpStatus;
9 import org.apache.commons.httpclient.methods.GetMethod;
10 import org.apache.commons.httpclient.methods.PostMethod;
11 import org.apache.commons.httpclient.params.HttpMethodParams;
12 //import org.apache.commons.httpclient.NameValuePair;
13 import org.apache.commons.logging.Log;
14 import org.apache.commons.logging.LogFactory;
15
16 /**
17 *
18 *Module:       HttpClientUtil.java
19 *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
20 *Company:
21 *Author:       ptp
22 *Date:         Feb 22, 2012
23 */
24
25 public class HttpClientUtil {
26
27     private static final Log log = LogFactory
28     .getLog(HttpClientUtil.class);
29
30     /**
31      * get方式
32      * @param param1
33      * @param param2
34      * @return
35 */
36     public static String getHttp(String param1,String param2){
37         String responseMsg = "";
38
39         // 1.构造HttpClient的实例
40         HttpClient httpClient = new HttpClient();
41
42         // 用于测试的http接口的url
43         String url="http://localhost:8080/UpDown/httpServer?param1="+param1+"¶m2="+param2;
44
45         // 2.创建GetMethod的实例
46         GetMethod getMethod = new GetMethod(url);
47
48         // 使用系统系统的默认的恢复策略
49         getMethod.getParams().setParameter(HttpMethodParams.R

补充：软件开发 , Java ,