httpClient远程调用webService

 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
步骤如下： 
准备工作：用到的jar包有： 下载链接
（http://download.csdn.net/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