java发送http请求
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package com.stock.show.util;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.PrintWriter;
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import java.net.URL;
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import java.net.URLConnection;
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import java.util.List;
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import java.util.Map;
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public class HttpRequestUtil {
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/**
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* 向指定URL发送GET方法的请求
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*
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* @param url
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* 发送请求的URL
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* @param param
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* 请求参数
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* @return URL 所代表远程资源的响应结果
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*/
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public static String sendGet(String url, Map<String,String> param) {
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String result = "";
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BufferedReader in = null;
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try {
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String urlNameString = url;
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//增加参数
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if(param!=null&?m.size()>0){
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urlNameString = urlNameString+"?";
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for(String key : param.keySet()){
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urlNameString = urlNameString + key + "=" + param.get(key);
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}
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}
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URL realUrl = new URL(urlNameString);
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// 打开和URL之间的连接
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URLConnection connection = realUrl.openConnection();
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// 设置通用的请求属性
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connection.setRequestProperty("accept", "*/*");
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connection.setRequestProperty("connection", "Keep-Alive");
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connection.setRequestProperty("user-agent",
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"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
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// 建立实际的连接
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connection.connect();
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// 获取所有响应头字段
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Map<String, List<String>> map = connection.getHeaderFields();
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// 遍历所有的响应头字段
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for (String key : map.keySet()) {
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System.out.println(key + "--->" + map.get(key));
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}
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// 定义 BufferedReader输入流来读取URL的响应
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in = new BufferedReader(new InputStreamReader(
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connection.getInputStream()));
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String line;
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while ((line = in.readLine()) != null) {
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result += line;
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}
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} catch (Exception e) {
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System.out.println("发送GET请求出现异常！" + e);
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e.printStackTrace();
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}
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// 使用finally块来关闭输入流
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finally {
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try {
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if (in != null) {
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in.close();
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}
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} catch (Exception e2) {
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e2.printStackTrace();
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}
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}
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return result;
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}
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/**
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* 向指定 URL 发送POST方法的请求
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*
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* @param url
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* 发送请求的 URL
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* @param param
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* 请求参数
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* @return 所代表远程资源的响应结果
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*/
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public static String sendPost(String url, Map<String,String> param) {
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PrintWriter out = null;
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BufferedReader in = null;
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String result = "";
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try {
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URL realUrl = new URL(url);
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// 打开和URL之间的连接
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URLConnection conn = realUrl.openConnection();
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// 设置通用的请求属性
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conn.setRequestProperty("accept", "*/*");
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conn.setRequestProperty("connection", "Keep-Alive");
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conn.setRequestProperty("user-agent",
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"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
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// 发送POST请求必须设置如下两行
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conn.setDoOutput(true);
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conn.setDoInput(true);
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// 获取URLConnection对象对应的输出流
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out = new PrintWriter(conn.getOutputStream());
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//处理参数
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String paramString = "";
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if(param!=null&?m.size()>0){
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for(String key : param.keySet()){
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paramString = paramString + key + "=" + param.get(key);
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}
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}
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// 发送请求参数
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out.print(paramString);
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// flush输出流的缓冲
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out.flush();
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// 定义BufferedReader输入流来读取URL的响应
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in = new BufferedReader(
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new InputStreamReader(conn.getInputStream()));
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String line;
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while ((line = in.readLine()) != null) {
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result += line;
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}
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} catch (Exception e) {
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System.out.println("发送 POST 请求出现异常！"+e);
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e.printStackTrace();
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}
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//使用finally块来关闭输出流、输入流
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finally{
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try{
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if(out!=null){
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out.close();
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}
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if(in!=null){
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in.close();
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}
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}
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catch(IOException ex){
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ex.printStackTrace();
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}
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}
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return result;
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}
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public static void main(String[] args) {
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//发送 GET 请求
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String s=HttpRequestUtil.sendGet("http://hq.sinajs.cn/list=sh601006", null);
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System.out.println(s);
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}
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}
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