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客服端以post請求輸入xml的輸入流，來到服務(wù)器端，服務(wù)器端接到輸入流，進行處理，處理完畢后，返回xml信息的返回輸出流，來告訴對方成功與否。

htppClient的使用至少需要commons-httpclient-3.1.jar，commons-logging-1.0.4.jar，commons-codec-1.3.jar三個Apache開源項目jar包的支持。（jar的版本可以不同，我用的是如上三個。）

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模擬客戶端代碼：

package httpClientDemo;
import java.io.File;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.FileRequestEntity;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;

public class HttpClientTest {
?? private static final String? LOGON_SITE = "localhost" ;
?? private static final int???? LOGON_PORT = 8080;

??? @SuppressWarnings("deprecation")
??public static void main(String[] args) throws Exception {
??????? File input = new File("d:\\test.xml");
??????? PostMethod post = new PostMethod("/Mytest/servlet/abc.do");
?????? NameValuePair name = new NameValuePair( "name" , "zhangjinping" );
?????? NameValuePair pass = new NameValuePair( "password" , "123456" );
??????? post.setRequestBody( new NameValuePair[]{name,pass});

??????? HttpClient client = new HttpClient();
??????? client.getHostConfiguration().setHost(LOGON_SITE, LOGON_PORT);
??
???????
????????
??????????????? RequestEntity entity = new FileRequestEntity(input, "text/xml; charset=utf-8");
????????????? //? post.setRequestHeader( "Content-type" , "text/xml; charset=utf-8" );
??????????????? post.setRequestEntity(entity);
??????????????? try {
????????
?????????????????? int result = client.executeMethod(post);

?????????????????? System.out.println("Response status code: " + result);

?????????????????? System.out.println("Response body: ");
????????
?????????????????? System.out.println(post.getResponseBodyAsString());
????????
??????????????? } finally {
????????
??????????????????? post.releaseConnection();
????????
??????????????? }
??????????????

????? /*? // 設(shè)置請求的內(nèi)容直接從文件中讀取
??????? post.setRequestBody( new FileInputStream(input));
??????? if (input.length() < Integer.MAX_VALUE)
?????????? post.setRequestContentLength(input.length());
??????? else
?????????? post.setRequestContentLength(EntityEnclosingMethod.CONTENT_LENGTH_CHUNKED);
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??????? // 指定請求內(nèi)容的類型
????
??????
??????? int result =client.executeMethod(post);
??????? System.out.println( "Response status code: " + result);
??????? System.out.println( "Response body: " );
??????? System.out.println(post.getRequestCharSet());
??????? System.out.println(post.getResponseBodyAsString());
??????? post.releaseConnection();
???? } */
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??? }

}

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服務(wù)器端代碼：

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package web;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.List;

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

import pojo.Student;
import bo.CreateBD;

import common.CreateXMLUtil;

public class AjaxTestServlet extends HttpServlet {

?/**
? * Constructor of the object.
? */
?public AjaxTestServlet() {
??super();
?}

?/**
? * Destruction of the servlet. <br>
? */
?public void destroy() {
??super.destroy(); // Just puts "destroy" string in log
??// Put your code here
?}

?/**
? * The doGet method of the servlet. <br>
? *
? * This method is called when a form has its tag value method equals to get.
? *
? * @param request the request send by the client to the server
? * @param response the response send by the server to the client
? * @throws ServletException if an error occurred
? * @throws IOException if an error occurred
? */
?public void doGet(HttpServletRequest request, HttpServletResponse response)
???throws ServletException, IOException {
?????????? doPost(request, response);
?}

?/**
? * The doPost method of the servlet. <br>
? *
? * This method is called when a form has its tag value method equals to post.
? *
? * @param request the request send by the client to the server
? * @param response the response send by the server to the client
? * @throws ServletException if an error occurred
? * @throws IOException if an error occurred
? */
?public void doPost(HttpServletRequest request, HttpServletResponse response)
???throws ServletException, IOException {
??
??System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.");
??String str = request.getParameter("testPost");
??String name= request.getParameter("name");
??String password = request.getParameter("password");
??System.out.println(name+"? "+password);
??@SuppressWarnings("unused")
??StringBuffer sb = new StringBuffer();
??InputStream is= request.getInputStream();
??
??InputStreamReader isr = new InputStreamReader(is);
??BufferedReader br = new BufferedReader(isr);
??while(true){
??????? str = br.readLine();
??????? if(str!=null)
???????? sb.append(str);
??????? if(str==null)
????? ?? break;
?? }
??
??System.out.println(sb.toString());
??
??response.setContentType("application/xml"); //application/xml代表的是XML形式返回
??response.setHeader("Cache-Control", "no-cache"); //設(shè)置不緩存
???????
??List<Student> students = CreateBD.getData();
??//組織返回數(shù)據(jù)
??String xml=CreateXMLUtil.getClassXML(students, "students");

??PrintWriter pw=null;
??try {
??//獲取頁面寫入器
??pw=response.getWriter();
??} catch (IOException e) {
??e.printStackTrace();
??}
??pw.write(xml);
??pw.flush();
??pw.close();
?

?}

?/**
? * Initialization of the servlet. <br>
? *
? * @throws ServletException if an error occurs
? */
?public void init() throws ServletException {
??// Put your code here
?}

}

?

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Apache官方：httpClient 詳解：

http://hc.apache.org/httpclient-3.x/

Apache官方：httpClient使用xmlPOST的舉例代碼：http://svn.apache.org/viewvc/httpcomponents/oac.hc3x/trunk/src/examples/

轉(zhuǎn)載于:https://www.cnblogs.com/alaricblog/p/3278275.html

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