httpClient学习笔记1

客服端以post请求输入xml的输入流，来到服务器端，服务器端接到输入流，进行处理，处理完毕后，返回xml信息的返回输出流，来告诉对方成功与否。

htppClient的使用至少需要commons-httpclient-3.1.jar，commons-logging-1.0.4.jar，commons-codec-1.3.jar三个Apache开源项目jar包的支持。（jar的版本可以不同，我用的是如上三个。）

模拟客户端代码：

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();

}

/* // 设置请求的内容直接从文件中读取
post.setRequestBody( new FileInputStream(input));
if (input.length() < Integer.MAX_VALUE)
post.setRequestContentLength(input.length());
else
post.setRequestContentLength(EntityEnclosingMethod.CONTENT_LENGTH_CHUNKED);

// 指定请求内容的类型

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();
} */

}

}

服务器端代码：

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"); //设置不缓存

List<Student> students = CreateBD.getData();
//组织返回数据
String xml=CreateXMLUtil.getClassXML(students, "students");

PrintWriter pw=null;
try {
//获取页面写入器
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
}

}

Apache官方：httpClient 详解：

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

Apache官方：httpClient使用xmlPOST的举例代码：http://svn.apache.org/viewvc/httpcomponents/oac.hc3x/trunk/src/examples/