使用apache 提供的httpclient方式向服务器提交数据

1、客服端：

其中 utils.java代码如下：

package com.zwh.httpclient;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

public class Utils {

	public Utils() {
		// TODO Auto-generated constructor stub
	}
	
	/**
	 * 
	 * @param path
	 * @param map
	 * @param encode
	 * @return
	 */
	
	public static String sendHttpClientPost(String path,
			Map<String, String> map, String encode) {
		List<NameValuePair> list=new ArrayList<NameValuePair>();
		for(Map.Entry<String, String> entry:map.entrySet()){
			
			list.add(new BasicNameValuePair(entry.getKey(),entry.getValue()));
			
		}
		try {
			//实现将请求中的参数封装到请求参数中，请求体中
			UrlEncodedFormEntity  entity=new UrlEncodedFormEntity(list,encode);
			//使用post方式提交
			HttpPost httpPost=new HttpPost(path);
			httpPost.setEntity(entity);
			//指定post方式提交数据
			DefaultHttpClient client =new DefaultHttpClient();
			
			HttpResponse httpResponse=client.execute(httpPost);
			if(httpResponse.getStatusLine().getStatusCode()==200){
				return changeInputStream(httpResponse.getEntity().getContent(),encode);
				
			}
			
		} catch (Exception e) {
			// TODO: handle exception
		}
		
		
		return "";
	}
	/**
	 * 
	 * @param inputStream
	 * @param encode
	 * @return
	 */
	private static String changeInputStream(InputStream inputStream,
			String encode) {
		// TODO Auto-generated method stub

		ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
		int len = 0;
		byte[] date = new byte[1024];
		String result = "";
		try {

			while ((len = inputStream.read(date)) != -1) {

				outputStream.write(date, 0, len);
			}
			result = new String(outputStream.toByteArray(), encode);
			
			return result;

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return null;
	}
	public static void main(String[] args) {
		String path="http://localhost:8080/httppost/LoginServlet";
		
		Map<String, String> params = new HashMap<String, String>();
		params.put("username", "admin");
		params.put("password", "123");
		
		String result=Utils.sendHttpClientPost(path, params, "utf-8");
		System.out.println(result);
		
	}

}

2、服务器端代码如下：

package com.zwh.http;

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

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

public class LoginServlet extends HttpServlet {


	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}


	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		this.doPost(request,response);
	}


	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		response.setCharacterEncoding("utf-8");
		request.setCharacterEncoding("utf-8");
		
		PrintWriter out=response.getWriter();
		
		String username=request.getParameter("username");
		String password=request.getParameter("password");
		System.out.println("---->username:"+username);
		System.out.println("---->password:"+password);
		
		if(username.equals("admin")&&password.equals("123")){
			out.println("login is success ! ");
		}else{
			out.println("login is failure ! ");
			
		}
		
		out.flush();
		out.close();
	
	}


	public void init() throws ServletException {
		// Put your code here
	}

}

客服端执行结果为：

login is success !