java HttpURLConnection 发送文件和字符串信息
以文件的形式传参
/** * 通过拼接的方式构造请求内容，实现参数传输以及文件传输 * * @param actionUrl 访问的服务器URL * @param params 普通参数 * @param files 文件参数 * @return * @throws IOException */ public static void post(String actionUrl, Map<String, String> params, Map<String, File> files) throws IOException {
String BOUNDARY = java.util.UUID.randomUUID().toString();
String PREFIX = "--", LINEND = "rn";
String MULTIPART_FROM_DATA = "multipart/form-data";
String CHARSET = "UTF-8";
URL uri = new URL(actionUrl);
HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
conn.setReadTimeout(5 * 1000);
// 缓存的最长时间 conn.setDoInput(true);
// 允许输入 conn.setDoOutput(true);
// 允许输出 conn.setUseCaches(false);
// 不允许使用缓存 conn.setRequestMethod("POST");
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Charsert", "UTF-8");
conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";
boundary=" + BOUNDARY);
// 首先组拼文本类型的参数 StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> entry : params.entrySet()) {
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINEND);
sb.append("Content-Disposition: form-data;
name="" + entry.getKey() + """ + LINEND);
sb.append("Content-Type: text/plain;
charset=" + CHARSET + LINEND);
sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
sb.append(LINEND);
sb.append(entry.getValue());
sb.append(LINEND);
}
DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
outStream.write(sb.toString().getBytes());
InputStream in = null;
// 发送文件数据 if (files != null) {
for (Map.Entry<String, File> file : files.entrySet()) {
StringBuilder sb1 = new StringBuilder();
sb1.append(PREFIX);
sb1.append(BOUNDARY);
sb1.append(LINEND);
// name是post中传参的键 filename是文件的名称 sb1.append("Content-Disposition: form-data;
name="file";
filename="" + file.getKey() + """ + LINEND);
sb1.append("Content-Type: application/octet-stream;
charset=" + CHARSET + LINEND);
sb1.append(LINEND);
outStream.write(sb1.toString().getBytes());
InputStream is = new FileInputStream(file.getValue());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
is.close();
outStream.write(LINEND.getBytes());
}
// 请求结束标志 byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
outStream.write(end_data);
outStream.flush();
// 得到响应码 int res = conn.getResponseCode();
if (res == 200) {
in = conn.getInputStream();
int ch;
StringBuilder sb2 = new StringBuilder();
while ((ch = in.read()) != -1) {
sb2.append((char) ch);
}
}
outStream.close();
conn.disconnect();
}
// return in.toString();
}
以数据流的形式传参
public static String postFile(String actionUrl, Map<String, String> params, Map<String, byte[]> files) throws Exception {
StringBuilder sb2 = null;
String BOUNDARY = java.util.UUID.randomUUID().toString();
String PREFIX = "--", LINEND = "rn";
String MULTIPART_FROM_DATA = "multipart/form-data";
String CHARSET = "UTF-8";
URL uri = new URL(actionUrl);
HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
conn.setReadTimeout(6 * 1000);
// 缓存的最长时间 conn.setDoInput(true);
// 允许输入 conn.setDoOutput(true);
// 允许输出 conn.setUseCaches(false);
// 不允许使用缓存 conn.setRequestMethod("POST");
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Charsert", "UTF-8");
conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";
boundary=" + BOUNDARY);
// 首先组拼文本类型的参数 StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> entry : params.entrySet()) {
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINEND);
sb.append("Content-Disposition: form-data;
name="" + entry.getKey() + """ + LINEND);
sb.append("Content-Type: text/plain;
charset=" + CHARSET + LINEND);
sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
sb.append(LINEND);
sb.append(entry.getValue());
sb.append(LINEND);
}
DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
outStream.write(sb.toString().getBytes());
InputStream in = null;
// 发送文件数据 if (files != null) {
for (Map.Entry<String, byte[]> file : files.entrySet()) {
StringBuilder sb1 = new StringBuilder();
sb1.append(PREFIX);
sb1.append(BOUNDARY);
sb1.append(LINEND);
sb1.append("Content-Disposition: form-data;
name="pic";
filename="" + file.getKey() + """ + LINEND);
sb1.append("Content-Type: application/octet-stream;
charset=" + CHARSET + LINEND);
sb1.append(LINEND);
outStream.write(sb1.toString().getBytes());
// InputStream is = new FileInputStream(file.getValue());
// byte[] buffer = new byte[1024];
// int len = 0;
// while ((len = is.read(buffer)) != -1) // {
// outStream.write(buffer, 0, len);
// }
// is.close();
outStream.write(file.getValue());
outStream.write(LINEND.getBytes());
}
// 请求结束标志 byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
outStream.write(end_data);
outStream.flush();
// 得到响应码 int res = conn.getResponseCode();
if (res == 200) {
in = conn.getInputStream();
int ch;
sb2 = new StringBuilder();
while ((ch = in.read()) != -1) {
sb2.append((char) ch);
}
System.out.println(sb2.toString());
}
outStream.close();
conn.disconnect();
// 解析服务器返回来的数据 return ParseJson.getEditMadIconResult(sb2.toString());
}
else {
return "Update icon Fail";
}
// return in.toString();
}
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