From 2ac9213b3abd4782aafeef648c6f12f9afedac2d Mon Sep 17 00:00:00 2001 From: Echo <1711788888@qq.com> Date: Fri, 10 Sep 2021 13:47:07 +0000 Subject: [PATCH] add src/main/java/com/eg/www/common/utils/HttpUtil. --- .../java/com/eg/www/common/utils/HttpUtil | 135 ++++++++++++++++++ 1 file changed, 135 insertions(+) create mode 100644 src/main/java/com/eg/www/common/utils/HttpUtil diff --git a/src/main/java/com/eg/www/common/utils/HttpUtil b/src/main/java/com/eg/www/common/utils/HttpUtil new file mode 100644 index 0000000..a8b411d --- /dev/null +++ b/src/main/java/com/eg/www/common/utils/HttpUtil @@ -0,0 +1,135 @@ +package com.eg.www.common.utils; + +import java.io.BufferedReader; +import java.io.IOException; +import java.io.InputStreamReader; +import java.io.PrintWriter; +import java.net.URL; +import java.net.URLConnection; +import java.util.List; +import java.util.Map; + +/** + * @author: Eg + * @Date: 2021/9/10 14:08 + */ +public class HttpUtil { + + /** + * 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 sendGet(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> 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; + } + + /** + * 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 所代表远程资源的响应结果 + */ + 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 += 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; + } + + public static void main(String[] args) { + sendGet("",""); + } + } +