http post 接口

集团需求管理系统通过网状网与给各省公司需求管理系统进行交互。落地方为发起方提供访问的URL，发起方使用HTTP POST方法发送请求报文并得到应答报文，发起方作为落地方的HTTP客户端，落地方作为发起方的HTTP服务器。因此，各个参与方需要同时实现HTTP客户端以及服务器的功能。

在HTTP传输过程中，HTTP Header部分需要遵循下面的约定:

在请求报文中：content-type=multipart/form-data

在应答报文中：content-type=multipart/mixed

HTTP交易报文需要遵循以下约定，报文头的parameter名为“xmlhead”；报文体的parameter名为“xmlbody”。

落地方即服务端代码

写一个servlet

<servlet>
<servlet-name>PlatFormFilter</servlet-name>
<servlet-class>com.asiainfo.aibsm.platform.inter.PlatFormServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>PlatFormFilter</servlet-name>
<url-pattern>/platformService</url-pattern>
</servlet-mapping>

在PlatFormServlet.java 的doPost(HttpServletRequest req, HttpServletResponse resp)方法中写一下逻辑

Map<String, Object> params = new HashMap<String, Object>();
FileItemFactory factory = new DiskFileItemFactory();//具体使用参考我的博客FileItemFactory类
ServletFileUpload upload = new ServletFileUpload(factory);
List items = upload.parseRequest( req );
Iterator iter = items.iterator();
while (iter.hasNext())
{
FileItem item = (FileItem) iter.next();
if (item.isFormField())
{
String name = item.getFieldName();
String value = item.getString("UTF-8");
params.put( name.toUpperCase(), value.trim());
}
}

String xmlhead = params.get( "XMLHEAD" ).toString();//报文头
String xmlbody = params.get( "XMLBODY" ).toString();//报文体

String responsXML = srv.getResponsesXML( xmlhead , xmlbody ); // 获取返回报文

//回复报文
this.log.info("应答报文：" + responsXML);
resp.setContentType("multipart/mixed");
resp.setCharacterEncoding("utf-8");
resp.getWriter().write( responsXML );

发起方即客户端代码

public static String postUrl( String url, Map<String,String> xmlheadMap, String xmlbody )
{
PostMethod post = null;
String respon = null;
String xmlhead = null;
try
{
xmlhead = getxmlhead( xmlheadMap );//报文头
log.info("开始访问：" + url );//服务端url
log.info( "xmlhead:" + xmlhead );
log.info( "xmlbody:" + xmlbody );

xmlbody = new String(xmlbody.getBytes("UTF-8"),"ISO-8859-1");//报文体 转成iso-8859-1
HttpClient client = new HttpClient();
post = getPostMethod(url, xmlhead , xmlbody );
client.getParams().setParameter("http.protocol.version",HttpVersion.HTTP_1_1);
// client.getParams().setParameter("http.protocol.content-charset","UTF-8");

client.executeMethod( post );
respon = post.getResponseBodyAsString();
log.info("应答报文：" + respon );
log.info("访问结束：" + url );
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
// 释放连接
post.releaseConnection();
}
return respon;
}

private static PostMethod getPostMethod( String url, String xmlhead, String xmlbody ) throws Exception
{
PostMethod post = new PostMethod(url);
List<Part> partList = new ArrayList<Part>();
partList.add(new StringPart("xmlhead", xmlhead, "UTF-8"));
partList.add(new StringPart("xmlbody", xmlbody, "UTF-8"));

//参考MultipartRequestEntity 类
MultipartRequestEntity multiEnt = new MultipartRequestEntity(
partList.toArray(new Part[partList.size()]),
post.getParams());
post.setRequestEntity(multiEnt);
return post;

}