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<String, List<String>> 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("","");
+    }
+    }
+