Android中的GET和POST请求

最新推荐文章于 2018-12-27 19:09:26 发布

qyyl2013

最新推荐文章于 2018-12-27 19:09:26 发布

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分类专栏： android 文章标签： android

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本文详细介绍了如何使用Java实现HTTP GET和POST请求的过程，包括创建URL连接、设置请求属性、发送请求及接收响应等内容。

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package com.xuexi.getposttest;

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 GetPostUtil {
	public static String sendGet(String url,String params)
	{
		String result="";
		BufferedReader in=null;
		String urlName=url+"?"+params;
		try {
			URL realUrl=new URL(urlName);
			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)");
			//建立实际的链接
			connection.connect();
			//获取所有响应头字段
			Map<String, List<String>> map=connection.getHeaderFields();
			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+="\n"+line;
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		finally
		{
			if (in!=null) {
				try {
					in.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
		
		return result;
	}
	public static String sendPost(String url,String params)
	{
		PrintWriter out=null;
		BufferedReader in=null;
		String result="";
		try {
			URL realUrl=new URL(url);
			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)");
			//发送POST请求必须设置如下两行
			connection.setDoInput(true);
			connection.setDoOutput(true);
			//获取URLConnection对象对应的输出流
			out=new PrintWriter(connection.getOutputStream());
			out.print(params);
			//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(connection.getInputStream()));
			String line;
			while((line=in.readLine())!=null)
			{
				result+="\n"+line;
			}
			
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		finally
		{
			
				try {
					if(out!=null){
						out.close();
					}
					if(in!=null)
					{
					in.close();
					}
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			
		}
		return result;
	}

}