java httpclient

以前也发过类似于这样的文章。但是这个正规。是Apache下的项目。

直接看代码：

/**
 * Mainbo.com Inc.
 * Copyright (c) 2015-2017 All Rights Reserved.
 */
package com.mainbo.jy.resdown.Main;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
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;
import org.apache.http.util.EntityUtils;

/**
 * <pre>
 *
 * </pre>
 *
 * @author huangjunhua
 * @version $Id: Main.java, v 1.0 2015年5月13日 下午12:01:09 huangjunhua Exp $
 */
public class Main {	
	/**
	* 返回接口信息
	* @param strUrl，接口参数  
	* paramStr 参数信息
	* @return 服务器返回信息
	 * @throws Exception 
	*/
	public static String postHttp(String url,String paramStr){
		String content="";
		try {
			// 创建默认的httpClient实例.    
		     HttpClient httpclient =new DefaultHttpClient();  
			 // 创建httpget.    
		     HttpPost httpPost = new HttpPost("http://localhost:8080/TestWeb/s");  
		     System.out.println("executing request " + httpPost.getURI()); 
		     //传递参数
		     List<NameValuePair> nvps = new ArrayList<NameValuePair>();  
		     nvps.add(new BasicNameValuePair("a", "中文"));  
		     nvps.add(new BasicNameValuePair("password", "secret20")); 
		     
		     //设置参数的编码
		     UrlEncodedFormEntity encodedFormEntity=new UrlEncodedFormEntity(nvps,"UTF-8");
                     //设置发送参数的实体
		     httpPost.setEntity(encodedFormEntity); 
		     
		     //执行post请求
	    	 HttpResponse httpResponse=httpclient.execute(httpPost);
	    	 
	    	 //返回来的实体
	    	 HttpEntity entity = httpResponse.getEntity();  
	    	 //响应状态  
	         System.out.println("status:" + httpResponse.getStatusLine());  
	         //判断响应实体是否为空  
	         if (entity != null) {  
	             System.out.println("contentEncoding:" + entity.getContentType());//返回参数的编码  
                     //返回参数的内容
	             System.out.println("response content:" + EntityUtils.toString(entity));  
	             content=EntityUtils.toString(entity);
	         }  
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return content;
}

 下面是接受的servlet代码：

import java.io.BufferedReader;
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 TestServlet extends HttpServlet{

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		this.doPost(req, resp);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		System.out.println("*******");
		String message = req.getParameter("a");
		String password = req.getParameter("password");
		
		System.out.println(message);
		System.out.println(password);
		
		req.setCharacterEncoding("UTF-8");
		resp.setContentType("text/plain; charset=utf-8");//设那边置编码防止http那边乱码
		resp.setCharacterEncoding("UTF-8");
		PrintWriter out=resp.getWriter ();
		out.print("欢迎:"+message);
	}
	
}