httpclient发送multipart/form-data类型参数和用MultipartRequest接收参数

一、利用HttpClient发送基于Content-Type="multipart/form-data"形式的表单

package com.test.httpclient;

import java.io.IOException;
import java.util.Map;

import javax.servlet.ServletException;

import org.apache.commons.httpclient.methods.RequestEntity;
import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity;
import org.apache.commons.httpclient.methods.multipart.Part;
import org.apache.commons.httpclient.methods.multipart.StringPart;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;

import org.apache.commons.httpclient.HttpClient;

public class SendXmlAction
{
public String execute() throws ServletException, IOException
{
String xmlhead = this.getRequest().getParameter("xmlhead");
String xmlbody = this.getRequest().getParameter("xmlbody");
System.out.println("xmlhead == "+xmlhead);
System.out.println("xmlbody == "+xmlbody);

// 用远程服务的URL设置生成POST方法，供HTTP客户端执行
String remoteUrl = "http://**.**.***.***:8888/project/receiveServlet";

PostMethod method = new PostMethod(remoteUrl);

// multipart/form-data; boundary=---------------------------7de2b13a790640

//method.addParameter("xmlhead", xmlhead);
//method.addParameter("xmlbody", xmlbody);

HttpClient HTTP_CLINET = new HttpClient();

synchronized (HTTP_CLINET)
{
try
{
//使用多重发送方式,发送两个独立的两个XML Part,基于Content-Type="multipart/form-data"形式的表单
Part[] parts = {new StringPart("xmlhead",xmlhead), new StringPart("xmlbody",xmlbody)}; //StringPart和FilePart都可以放进去
RequestEntity requestEntity = new MultipartRequestEntity(parts, method.getParams());
method.setRequestEntity(requestEntity);

method.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 30000);
//链接超时 30秒
HTTP_CLINET.getHttpConnectionManager().getParams().setConnectionTimeout(30000);
//读取超时 30秒
HTTP_CLINET.getHttpConnectionManager().getParams().setSoTimeout(30000);

HTTP_CLINET.executeMethod(method);

String[] result = new String[2];
result[0] = String.valueOf(method.getStatusCode());
result[1] = method.getResponseBodyAsString();
System.out.println("http status : "+result[0]);
System.out.println("http response : "+result[1]);

}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
if (method != null)
{
method.releaseConnection();
}
method = null;
}
}

return "success";
}
}

二、MultipartRequest接收参数

package com.test.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.File;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

import com.oreilly.servlet.MultipartRequest;

public class BossServlet extends HttpServlet
{

/** serialVersionUID */
private Logger logger = Logger.getLogger(BossServlet.class);

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
this.doPost(request, response);
}

protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
// MultipartRequest
String head = null ;
String body = null ;

try
{
File fileDir = new File(this.getServletContext().getRealPath("/formhttp"));
if (!fileDir.exists())
{
fileDir.mkdirs();
}

int inmaxPostSize = 10 * 1024 * 1024;

// utf-8中文编码模式上传文件
MultipartRequest multirequest = new MultipartRequest(request,fileDir.getAbsolutePath(),inmaxPostSize,"UTF-8");

head = multirequest.getParameter("head");
body = multirequest.getParameter("body");
System.out.println("xmlHead2 = " + xmlHead);
System.out.println("xmlBody2 = " + xmlBody);
}
catch (Exception e)
{
e.printStackTrace();
}

response.setCharacterEncoding("UTF-8");
response.setContentType("multipart/mixed;boundary=---------------------------7de2b13a790640");
PrintWriter out = response.getWriter();

String res = null;
try
{
res = .....
}
catch (Exception e)
{
e.printStackTrace();
}

if (!(res == null || "".equals(res)))
{
try
{
out.println(res);
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
out.close();
}

}
}

public void init() throws ServletException
{
super.init();
}
}

若发送基于Content-Type="multipart/form-data"形式的表单，却通过request.getParameter("**")获取参数值，则获取的参数值为空。