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Java后端 带File文件及其它参数的Post请求

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Java后端 带File文件及其它参数的Post请求

2024-07-09 02:02| 来源: 网络整理| 查看: 265

Java 带File文件及其它参数的Post请求 对于文件上传，客户端通常就是页面，在前端web页面里实现上传文件不是什么难事，写个form,加上enctype = “multipart/form-data”,在写个接收的就可以了，没什么难的。 如果要用java.net.HttpURLConnection，java后台来实现文件上传，还真有点搞头，实现思路和具体步骤就是模拟页面的请求，页面发出的格式如下： -----------------------------7da2e536604c8 Content-Disposition: form-data; name=“luid”

123 -----------------------------7da2e536604c8 Content-Disposition: form-data; name=“file1”; filename=“D:\haha.txt” Content-Type: text/plain

haha hahaha -----------------------------7da2e536604c8 Content-Disposition: form-data; name=“file”; filename=“D:\huhu.png” Content-Type: application/octet-stream

这里是图片的二进制数据 -----------------------------7da2e536604c8– demo代码只有两个参数，一个File，一个String

public static void sendPostWithFile(String filePath) { DataOutputStream out = null; final String newLine = "\r\n"; final String prefix = "--"; try { URL url = new URL("https://ws-di1.sit.cmrh.com/aiisp/v1/mixedInvoiceFileOCR"); HttpURLConnection conn = (HttpURLConnection)url.openConnection(); String BOUNDARY = "-------7da2e536604c8"; conn.setRequestMethod("POST"); // 发送POST请求必须设置如下两行 conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("Charsert", "UTF-8"); conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY); out = new DataOutputStream(conn.getOutputStream()); // 添加参数file File file = new File(filePath); StringBuilder sb1 = new StringBuilder(); sb1.append(prefix); sb1.append(BOUNDARY); sb1.append(newLine); sb1.append("Content-Disposition: form-data;name=\"file\";filename=\"" + file.getName() + "\"" + newLine); sb1.append("Content-Type:application/octet-stream"); sb1.append(newLine); sb1.append(newLine); out.write(sb1.toString().getBytes()); DataInputStream in = new DataInputStream(new FileInputStream(file)); byte[] bufferOut = new byte[1024]; int bytes = 0; while ((bytes = in.read(bufferOut)) != -1) { out.write(bufferOut, 0, bytes); } out.write(newLine.getBytes()); in.close(); // 添加参数sysName StringBuilder sb = new StringBuilder(); sb.append(prefix); sb.append(BOUNDARY); sb.append(newLine); sb.append("Content-Disposition: form-data;name=\"sysName\""); sb.append(newLine); sb.append(newLine); sb.append("test"); out.write(sb.toString().getBytes()); // 添加参数returnImage StringBuilder sb2 = new StringBuilder(); sb2.append(newLine); sb2.append(prefix); sb2.append(BOUNDARY); sb2.append(newLine); sb2.append("Content-Disposition: form-data;name=\"returnImage\""); sb2.append(newLine); sb2.append(newLine); sb2.append("false"); out.write(sb2.toString().getBytes()); byte[] end_data = ("\r\n--" + BOUNDARY + "--\r\n").getBytes(); // 写上结尾标识 out.write(end_data); out.flush(); out.close(); // 定义BufferedReader输入流来读取URL的响应 BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream())); String line = null; while ((line = reader.readLine()) != null) { System.out.println(line); } } catch (Exception e) { System.out.println("发送POST请求出现异常！" + e); e.printStackTrace(); } }

借阅【java后台发起上传文件的post请求(http和https)】

我自己封装的类,通用类 /** * post请求 不带file * 参数使用 * JSONObject jp = new JSONObject(); * String param = jp.toJSONString() */ public static String sendPost(String url, String param) { PrintWriter out = null; BufferedReader in = null; String result = ""; try { URL realUrl = new URL(url); // URL realUrl = new URL("https://testzoms.txffp.com/pcs/app/common/checkInvoice"); URLConnection conn = realUrl.openConnection(); 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); out = new PrintWriter(conn.getOutputStream()); out.print(param); 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; // System.out.println(result); } } 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 e) { e.printStackTrace(); } } return result; } /** * post请求 带file,map是其余参数 */ public static JSONObject sendPostWithFile(MultipartFile file, HashMap map) { DataOutputStream out = null; DataInputStream in = null; final String newLine = "\r\n"; final String prefix = "--"; JSONObject json = null; PropUtils propUtils = new PropUtils("cfg.properties"); try { String fileOCRUrl = propUtils.getProp("fileOCRUrl"); URL url = new URL(fileOCRUrl); HttpURLConnection conn = (HttpURLConnection)url.openConnection(); String BOUNDARY = "-------KingKe0520a"; conn.setRequestMethod("POST"); // 发送POST请求必须设置如下两行 conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("Charsert", "UTF-8"); conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY); out = new DataOutputStream(conn.getOutputStream()); // 添加参数file // File file = new File(filePath); StringBuilder sb1 = new StringBuilder(); sb1.append(prefix); sb1.append(BOUNDARY); sb1.append(newLine); sb1.append("Content-Disposition: form-data;name=\"file\";filename=\"" + file.getName() + "\"" + newLine); sb1.append("Content-Type:application/octet-stream"); sb1.append(newLine); sb1.append(newLine); out.write(sb1.toString().getBytes()); // in = new DataInputStream(new FileInputStream(file)); in = new DataInputStream(file.getInputStream()); byte[] bufferOut = new byte[1024]; int bytes = 0; while ((bytes = in.read(bufferOut)) != -1) { out.write(bufferOut, 0, bytes); } out.write(newLine.getBytes()); StringBuilder sb = new StringBuilder(); int k = 1; for (String key : map.keySet()) { if (k != 1) { sb.append(newLine); } sb.append(prefix); sb.append(BOUNDARY); sb.append(newLine); sb.append("Content-Disposition: form-data;name=" + key + ""); sb.append(newLine); sb.append(newLine); sb.append(map.get(key)); out.write(sb.toString().getBytes()); sb.delete(0, sb.length()); k++; } // 添加参数sysName /*StringBuilder sb = new StringBuilder(); sb.append(prefix); sb.append(BOUNDARY); sb.append(newLine); sb.append("Content-Disposition: form-data;name=\"sysName\""); sb.append(newLine); sb.append(newLine); sb.append("test"); out.write(sb.toString().getBytes());*/ // 添加参数returnImage /*StringBuilder sb2 = new StringBuilder(); sb2.append(newLine); sb2.append(prefix); sb2.append(BOUNDARY); sb2.append(newLine); sb2.append("Content-Disposition: form-data;name=\"returnImage\""); sb2.append(newLine); sb2.append(newLine); sb2.append("false"); out.write(sb2.toString().getBytes());*/ byte[] end_data = ("\r\n--" + BOUNDARY + "--\r\n").getBytes(); out.write(end_data); out.flush(); // 定义BufferedReader输入流来读取URL的响应 BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream())); String line = null; StringBuffer resultStr = new StringBuffer(); while ((line = reader.readLine()) != null) { resultStr.append(line); } json = (JSONObject)JSONObject.parse(resultStr.toString()); } catch (Exception e) { System.out.println("发送POST请求出现异常！" + e); e.printStackTrace(); } finally { try { if (out != null) { out.close(); } if (in != null) { in.close(); } } catch (IOException e) { e.printStackTrace(); } } return json; } /** * 配置文件通用类 * 用法：实例化后直接调用getProp() * new PropUtils(filePath)传入文件路径，resources下面的部分路径 * @author jianbin */ public class PropUtils { private Properties properties; public PropUtils(String propertisFile) { InputStream in = null; try { properties = new Properties(); in = PropUtils.class.getResourceAsStream("/"+propertisFile); properties.load(in); } catch (IOException e) { e.printStackTrace(); } } public String getProp(String key){ return properties.getProperty(key); } /*public static void main(String[] args) { PropUtils propUtils = new PropUtils("cfg.properties"); String str = propUtils.getProp("jobStatus.3"); System.out.println(str); }*/ }


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