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teachcloud-common/src/main/java/com/qmth/teachcloud/common/util/HttpKit.java

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+package com.qmth.teachcloud.common.util;
+
+import com.qmth.teachcloud.common.enums.ExceptionResultEnum;
+
+import java.io.*;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.Date;
+import java.util.Map;
+
+public class HttpKit {
+
+    /**
+     * 向指定 URL 发送POST方法的请求
+     *
+     * @param url    发送请求的 URL
+     * @param params 请求的参数集合
+     * @return 远程资源的响应结果
+     */
+    @SuppressWarnings("unused")
+    public static String sendPost(String url, Map<String, String> params, Map<String, String> requestHeader) {
+        OutputStreamWriter out = null;
+        BufferedReader in = null;
+        StringBuilder result = new StringBuilder();
+        try {
+            URL realUrl = new URL(url);
+            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
+            // 发送POST请求必须设置如下两行
+            conn.setDoOutput(true);
+            conn.setDoInput(true);
+            // POST方法
+            conn.setRequestMethod("POST");
+            // 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)");
+            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
+            if (requestHeader != null && requestHeader.size() > 0) {
+                for (Map.Entry<String, String> entry : requestHeader.entrySet()) {
+                    conn.setRequestProperty(entry.getKey(), entry.getValue());
+                }
+            }
+//            conn.setRequestProperty("Authorization", authorization);
+            conn.connect();
+            // 获取URLConnection对象对应的输出流
+            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
+            // 发送请求参数
+            if (params != null) {
+                StringBuilder param = new StringBuilder();
+                for (Map.Entry<String, String> entry : params.entrySet()) {
+                    if (param.length() > 0) {
+                        param.append("&");
+                    }
+                    param.append(entry.getKey());
+                    param.append("=");
+                    param.append(entry.getValue());
+                }
+                out.write(param.toString());
+            }
+            // 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(), "UTF-8"));
+            String line;
+            while ((line = in.readLine()) != null) {
+                result.append(line);
+            }
+        } catch (Exception 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.toString();
+    }
+
+    /**
+     * 发送post请求
+     *
+     * @param requestUrl       请求url
+     * @param requestHeader    请求头
+     * @param formTexts        表单数据
+     * @param files            上传文件
+     * @param requestEncoding  请求编码
+     * @param responseEncoding 响应编码
+     * @return 页面响应html
+     */
+    public static String sendPost(String requestUrl, Map<String, String> requestHeader, Map<String, String> formTexts, Map<String, String> files, String requestEncoding, String responseEncoding) {
+        OutputStream out = null;
+        BufferedReader reader = null;
+        String result = "";
+        try {
+            if (requestUrl == null || requestUrl.isEmpty()) {
+                return result;
+            }
+            URL realUrl = new URL(requestUrl);
+            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
+            connection.setRequestProperty("accept", "text/html, application/xhtml+xml, image/jxr, */*");
+            connection.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0");
+            if (requestHeader != null && requestHeader.size() > 0) {
+                for (Map.Entry<String, String> entry : requestHeader.entrySet()) {
+                    connection.setRequestProperty(entry.getKey(), entry.getValue());
+                }
+            }
+            connection.setDoOutput(true);
+            connection.setDoInput(true);
+            connection.setRequestMethod("POST");
+            if (requestEncoding == null || requestEncoding.isEmpty()) {
+                requestEncoding = "UTF-8";
+            }
+            if (responseEncoding == null || responseEncoding.isEmpty()) {
+                responseEncoding = "UTF-8";
+            }
+            if (files == null || files.size() == 0) {
+                connection.setRequestProperty("content-type", "application/x-www-form-urlencoded");
+                out = new DataOutputStream(connection.getOutputStream());
+                if (formTexts != null && formTexts.size() > 0) {
+                    String formData = "";
+                    for (Map.Entry<String, String> entry : formTexts.entrySet()) {
+                        formData += entry.getKey() + "=" + entry.getValue() + "&";
+                    }
+                    formData = formData.substring(0, formData.length() - 1);
+                    out.write(formData.getBytes(requestEncoding));
+                }
+            } else {
+                String boundary = "-----------------------------" + new Date().getTime();
+                connection.setRequestProperty("content-type", "multipart/form-data; boundary=" + boundary);
+                out = new DataOutputStream(connection.getOutputStream());
+                if (formTexts != null && formTexts.size() > 0) {
+                    StringBuilder sbFormData = new StringBuilder();
+                    for (Map.Entry<String, String> entry : formTexts.entrySet()) {
+                        sbFormData.append("--" + boundary + "\r\n");
+                        sbFormData.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"\r\n\r\n");
+                        sbFormData.append(entry.getValue() + "\r\n");
+                    }
+                    out.write(sbFormData.toString().getBytes(requestEncoding));
+                }
+                for (Map.Entry<String, String> entry : files.entrySet()) {
+                    String fileName = entry.getKey();
+                    String filePath = entry.getValue();
+                    if (fileName == null || fileName.isEmpty() || filePath == null || filePath.isEmpty()) {
+                        continue;
+                    }
+                    File file = new File(filePath);
+                    if (!file.exists()) {
+                        continue;
+                    }
+                    out.write(("--" + boundary + "\r\n").getBytes(requestEncoding));
+                    out.write(("Content-Disposition: form-data; name=\"file\"; filename=\"" + file.getName() + "\"\r\n").getBytes(requestEncoding));
+                    out.write(("Content-Type: application/octet-stream\r\n\r\n").getBytes(requestEncoding));
+                    DataInputStream in = new DataInputStream(new FileInputStream(file));
+                    int bytes = 0;
+                    byte[] bufferOut = new byte[1024];
+                    while ((bytes = in.read(bufferOut)) != -1) {
+                        out.write(bufferOut, 0, bytes);
+                    }
+                    in.close();
+                    out.write(("\r\n").getBytes(requestEncoding));
+                }
+                out.write(("--" + boundary + "--").getBytes(requestEncoding));
+            }
+            out.flush();
+            out.close();
+//            out = null;
+            reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), responseEncoding));
+            String line;
+            while ((line = reader.readLine()) != null) {
+                result += line;
+            }
+        } catch (Exception e) {
+            throw ExceptionResultEnum.ERROR.exception("发送POST请求出现异常：" + e.getMessage());
+        } finally {
+            try {
+                if (out != null) {
+                    out.close();
+                }
+                if (reader != null) {
+                    reader.close();
+                }
+            } catch (IOException ex) {
+                ex.printStackTrace();
+            }
+        }
+        return result;
+    }
+}