GetPosyTest.java

package com.hjy;

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

public class GetPosyTest {
	/**
	 * 向指定URL发送get请求
	 * @param url发送请求的URL
	 * @param param请求参数 格式满足name1=value&name2=value2 的形式
	 * @return URL代表远程资源的响应
	 */
	public static String sendGet(String url,String param){
		String result="";
		String urlName = url;
		if(param != null){
			urlName = url + "?" + param;
		}
		try {
			URL realUrl = new URL(urlName);
			//打开与URL的连接
			URLConnection conn = realUrl.openConnection();
			//设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1"
					+ "; SV1)");
			//建立实际的连接
			conn.connect();
			//获取所有的响应头字段
			Map<String, List<String>> map = conn.getHeaderFields();
			for(String key : map.keySet()){
				System.out.println(key + "--->" + map.get(key));
			}
			try(BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8"))){
				String line;
				while((line = in.readLine()) != null){
					result += "\n" +line;
				}
			}
		} catch (Exception e) {
			System.out.println("发送请求异常");
			e.printStackTrace();
		}
		return result;
	}
	
	/**
	 * 向指定的URL发送Post请求
	 * @param url 发送请求的url
	 * @param param 请求参数 ，格式满足 name1=value1&name2=value2的形式
	 * @return URL代表远程资源的响应
	 */
	public static String sendPost(String url,String param){
		String result = "";
		try {
			URL realUrl = new URL(url);
			//打开和URL之间的连接
			URLConnection conn = realUrl.openConnection();
			//设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1"
					+ "; SV1)");
			//发送post请求必须设置如下两行
			conn.setDoOutput(true);
			conn.setDoInput(true);
			try(//获取URLConnection对象对应的输出流
					PrintWriter out = new PrintWriter(conn.getOutputStream())
			){
				//发送请求参数
				out.print(param);
				//flush输出流的缓冲
				out.flush();
			}
			try(//定义BufferedReader输入流来读取URL的响应
					BufferedReader in = new BufferedReader(
							new InputStreamReader(conn.getInputStream(), "utf-8"))
			){
				String line;
				while((line = in.readLine()) != null){
					result += "\n" + line;
				}
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	
		return result;
	}
	public static void main(String[] args) {
		//发送get请求
		String s = GetPosyTest.sendGet("http://localhost:8888/login.html", null);
		System.out.println(s);
		//发送post请求
		String s1 = GetPosyTest.sendPost("http://localhost:8888/login.html", "name=123&age=223");
		System.out.println(s1);
	}
}