testgetpost.java

疯狂Java讲义_源码(含Java设计模式CHM

import java.io.*; 
import java.net.*;
import java.util.*;

/**
 * @author  yeeku.H.lee [e-mail]
 * @version  1.0
 * <br>Copyright (C), 2008-2010, yeeku.H.Lee
 * <br>This program is protected by copyright laws.
 * <br>Program Name:
 * <br>Date: 
 */

public class TestGetPost
{
	/**
	 * 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
	 */
	public static String sendGet(String url , String param) 
	{
		String result = "";
		BufferedReader in = null;
		try
		{
			String urlName = url + "?" + param;
			URL realUrl = new URL(urlName);
			//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)"); 
			//建立实际的连接
			conn.connect(); 
			//获取所有响应头字段
			Map<String,List<String>> map = conn.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(conn.getInputStream()));
			String line;
			while ((line = in.readLine())!= null)
			{
				result += "\n" + 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 (IOException ex)
			{
				ex.printStackTrace();
			}
		}
		return result;
	}

	/**
	 * 向指定URL发送POST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
	 */	
	public static String sendPost(String url,String param)
	{
		PrintWriter out = null;
		BufferedReader in = null;
		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);
			//获取URLConnection对象对应的输出流
			out = new PrintWriter(conn.getOutputStream());
			//发送请求参数
			out.print(param);
			//flush输出流的缓冲
			out.flush();
			//定义BufferedReader输入流来读取URL的响应
			in = new BufferedReader(
				new InputStreamReader(conn.getInputStream()));
			String line;
			while ((line = in.readLine())!= null)
			{
				result += "\n" + line;
			}
		}
		catch(Exception e)
		{
			System.out.println("发送POST请求出现异常！" + e);
			e.printStackTrace();
		}
		//使用finally块来关闭输出流、输入流
		finally
		{
			try
			{
				if (out != null)
				{
					out.close();
				}
				if (in != null)
				{
					in.close();
				}
			}
			catch (IOException ex)
			{
				ex.printStackTrace();
			}
		}
		return result;
	}

	//提供主方法，测试发送GET请求和POST请求
	public static void main(String args[])
	{
		//发送GET请求
		String s = TestGetPost.sendGet("http://localhost:8888/abc/login.jsp",null);
		System.out.println(s);
		//发送POST请求
		String s1 = TestGetPost.sendPost("http://localhost:8888/abc/a.jsp",
			"user=李刚&pass=abc");
		System.out.println(s1);
	}
}