httpClient请求

一、需求在Java后台请求driver接口；

二、HttpClient实现类：

package com.szy.project.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;

public class HttpClientUtil {
	
	private static Logger log = Logger.getLogger(HttpClientUtil.class);
	
	/**通过httpclient向第三方发送请求*/
	public static String sendHttpPost(String url, String param){  
        HttpURLConnection conn = null;  
        PrintWriter out = null;  
        BufferedReader in = null;  
        String responseStr = null;  
        try {  
            // 建立连接  
            URL httpUrl = new URL(url);  
            conn = (HttpURLConnection)httpUrl.openConnection();  
            //设置基本属性  
            conn.setRequestProperty("accept", "*/*");  
            conn.setRequestProperty("connection", "Keep-Alive");  
            conn.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");  
            conn.setDoInput(true);  
            conn.setDoOutput(true);  
            conn.setRequestMethod("POST");  
            //设置超时时间  
            conn.setConnectTimeout(30000);  
            conn.setReadTimeout(30000);  
            //输出流传参  
            out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(),"UTF-8"));  
            out.print(param);  
            out.flush();  
            // 定义输入流读取响应  
            in = new BufferedReader(  
                    new InputStreamReader(conn.getInputStream(), "UTF-8"));  
            // 读取响应数据  
            String line = "";  
            StringBuffer result = new StringBuffer();  
            while ((line = in.readLine()) != null) {  
                result.append(line);  
            }  
            responseStr = result.toString();  
        }catch(MalformedURLException e){ 
        	e.printStackTrace();
        	log.fatal("httpclient请求异常", e);
        }catch (Exception e) { 
        	e.printStackTrace();
        	log.fatal("httpclient未知异常",e);
        }finally{  
            try {  
                //释放资源  
                if (null != in){  
                    in.close();  
                }  
                if (null != out){  
                    out.close();  
                }  
                if (null != conn){  
                    conn.disconnect();  
                }  
            } catch (IOException e) {  
            	
            }  
        }  
        return responseStr;  
    } 
	/**
     * 向指定URL发送GET方法的请求
     * 
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendHttpGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }
}

三、其中post请求中：

 out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(),"UTF-8"));  

这句代码加了字符流的字符集编码，为了防止中文字符乱码情况；