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 ———————————————— 版权声明：本文为CSDN博主「jianbin.huang」的原创文章，遵循CC 4.0 by-sa版权协议，转载请附上原文出处链接及本声明。 原文链接：https://blog.csdn.net/qq_17782389/article/details/91519554
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();
}
}
————————
/**
* 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<String, Object> 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);
}*/
}
原文地址：https://www.cnblogs.com/kaschie/p/11423195.html
时间： 2024-08-01 11:01:24