Httpclient远程调用WebService示例（Eclipse+httpclient）

最新推荐文章于 2021-02-25 09:51:00 发布

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最新推荐文章于 2021-02-25 09:51:00 发布

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文章标签：开发工具 java

原文链接：https://my.oschina.net/boltwu/blog/416213

本文将演示如何利用Eclipse开发工具和Apache HttpClient库，通过GET和POST方式调用WebService，包括静态和动态构造请求数据的过程。以E邮宝开放的webservice接口为例，实现API函数的调用。

为什么80%的码农都做不了架构师？>>>

我们将Web Service发布在Tomcat或者其他应用服务器上后，有很多方法可以调用该Web Service，常用的有两种：

1、通过浏览器HTTP调用，返回规范的XML文件内容
2、通过客户端程序调用，返回结果可自定义格式

      接下来，我利用Eclipse作为开发工具，演示一个Httpclient调用WebService的简单示例
      第一种调用见我的另一篇博文：http://www.cnblogs.com/lanxuezaipiao/archive/2013/05/10/3071584.html
      步骤如下：

     准备工作：用到的jar包有：下载链接（http://download.youkuaiyun.com/detail/lanxuezaipiao/5354480）

第一步：新建Java Project，项目名称为HttpCallWebService

第二步：将所需jar包导入到库中

第三步：编写调用class，这里有两种方式调用，即GET方式和POST方式，由于POST方式较安全，故这里采用POST方式调用；请求数据的构造也有两种方式：静态和动态构造，下面分别介绍这两种方式：

注：这里以E邮宝开放的webservice接口为例调用其中一个API函数，而E邮宝的webservice基于SOAP，故请求数据为SOAP格式，大家可根据自己情况进行修改

静态构造请求数据：

package com.http;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.methods.InputStreamRequestEntity;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;

public class StaticHttpclientCall {

    /**
     * @param args
     * @throws IOException
     * @throws HttpException
     */
    public static void main(String[] args) throws HttpException, IOException {
        // TODO Auto-generated method stub

        String soapRequestData = "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
                + "<soap12:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\""
                + " xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\""
                + " xmlns:soap12=\"http://www.w3.org/2003/05/soap-envelope\">"
                + " <soap12:Body>"
                + " <GetAPACShippingPackage xmlns=\"http://shippingapi.ebay.cn/\">"
                + " <GetAPACShippingPackageRequest>"
                + " <TrackCode>123</TrackCode>"
                + " <Version>123</Version>"
                + " <APIDevUserID>123</APIDevUserID>"
                + " <APIPassword>123</APIPassword>"
                + " <APISellerUserID>123</APISellerUserID>"
                + " <MessageID>123</MessageID>"
                + " </GetAPACShippingPackageRequest>"
                + " </GetAPACShippingPackage>" + "</soap12:Body>"
                + " </soap12:Envelope>";

        System.out.println(soapRequestData);

        PostMethod postMethod = new PostMethod(
                "http://epacketws.pushauction.net/v3/orderservice.asmx?wsdl");

        // 然后把Soap请求数据添加到PostMethod中
        byte[] b = soapRequestData.getBytes("utf-8");
        InputStream is = new ByteArrayInputStream(b, 0, b.length);
        RequestEntity re = new InputStreamRequestEntity(is, b.length,
                "application/soap+xml; charset=utf-8");
        postMethod.setRequestEntity(re);

        // 最后生成一个HttpClient对象，并发出postMethod请求
        HttpClient httpClient = new HttpClient();
        int statusCode = httpClient.executeMethod(postMethod);
        if(statusCode == 200) {
            System.out.println("调用成功！");
            String soapResponseData = postMethod.getResponseBodyAsString();
            System.out.println(soapResponseData);
        }
        else {
            System.out.println("调用失败！错误码：" + statusCode);
        }

    }

}

动态构造数据：

package com.http;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.InputStreamRequestEntity;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;

// 动态构造调用串，灵活性更大
public class DynamicHttpclientCall {

    private String namespace;
    private String methodName;
    private String wsdlLocation;
    private String soapResponseData;

    public DynamicHttpclientCall(String namespace, String methodName,
            String wsdlLocation) {

        this.namespace = namespace;
        this.methodName = methodName;
        this.wsdlLocation = wsdlLocation;
    }

    private int invoke(Map<String, String> patameterMap) throws Exception {
        PostMethod postMethod = new PostMethod(wsdlLocation);
        String soapRequestData = buildRequestData(patameterMap);

        byte[] bytes = soapRequestData.getBytes("utf-8");
        InputStream inputStream = new ByteArrayInputStream(bytes, 0,
                bytes.length);
        RequestEntity requestEntity = new InputStreamRequestEntity(inputStream,
                bytes.length, "application/soap+xml; charset=utf-8");
        postMethod.setRequestEntity(requestEntity);

        HttpClient httpClient = new HttpClient();
        int statusCode = httpClient.executeMethod(postMethod);
        soapResponseData = postMethod.getResponseBodyAsString();

        return statusCode;
    }

    private String buildRequestData(Map<String, String> patameterMap) {
        StringBuffer soapRequestData = new StringBuffer();
        soapRequestData.append("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
        soapRequestData
                .append("<soap12:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\""
                        + " xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\""
                        + " xmlns:soap12=\"http://www.w3.org/2003/05/soap-envelope\">");
        soapRequestData.append("<soap12:Body>");
        soapRequestData.append("<" + methodName + " xmlns=\"" + namespace
                + "\">");
        soapRequestData.append("<" + methodName + "Request>");

        Set<String> nameSet = patameterMap.keySet();
        for (String name : nameSet) {
            soapRequestData.append("<" + name + ">" + patameterMap.get(name)
                    + "</" + name + ">");
        }
        
        soapRequestData.append("</" + methodName + "Request>");
        soapRequestData.append("</" + methodName + ">");
        soapRequestData.append("</soap12:Body>");
        soapRequestData.append("</soap12:Envelope>");

        return soapRequestData.toString();
    }

    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        // TODO Auto-generated method stub

        DynamicHttpclientCall dynamicHttpclientCall = new DynamicHttpclientCall(
                "http://shippingapi.ebay.cn/", "GetAPACShippingPackage",
                "http://epacketws.pushauction.net/v3/orderservice.asmx?wsdl");

        Map<String, String> patameterMap = new HashMap<String, String>();

        patameterMap.put("TrackCode", "123");
        patameterMap.put("Version", "123");
        patameterMap.put("APIDevUserID", "123");
        patameterMap.put("APIPassword", "123");
        patameterMap.put("APISellerUserID", "123");
        patameterMap.put("MessageID", "123");
        patameterMap.put("TrackCode", "123");

        String soapRequestData = dynamicHttpclientCall.buildRequestData(patameterMap);
        System.out.println(soapRequestData);

        int statusCode = dynamicHttpclientCall.invoke(patameterMap);
        if(statusCode == 200) {
            System.out.println("调用成功！");
            System.out.println(dynamicHttpclientCall.soapResponseData);
        }
        else {
            System.out.println("调用失败！错误码：" + statusCode);
        }
        
    }

}

最终运行结果：

可见最终返回的也是xml格式的数据，这里数据未进行格式化显示和处理

转载于:https://my.oschina.net/boltwu/blog/416213