java HttpsURLConnection POST方法失败。我不知道我是否有正确的writer和/或outputstream writer。对于多部分/formdata
我正在使用多部分/表单数据发送POST请求。我使用了一个将数据存储为csv的文件。文件是person,positon,id。我担心错误可能是没有正确的写入程序,比如Dataoutput stream vs outputstream。我设置回车和换行的方式或者我的任何连接设置都是关闭的。URL是正确的,但最后一个参数要求输入一个文件名,我把它放在内容处理中。我做了这么多改变,但还是无法摆脱这个错误。我只是想知道这件事有没有错。我返回了一个500错误,但这会导致收到此错误:
org。springframework。网状物多部分。MultipartException:无法解析多部分servlet请求;嵌套的例外是java。伊奥。IOException:org。阿帕奇。公猫util。http。文件上传。impl。IOFileUploadException:处理多部分/表单数据请求失败。流意外结束
如有任何建议或更改,将不胜感激
公共静态字符串postFile(字符串url)引发IOException{
String boundary = "xxxxxxxxxxxxxxxxxxxxxxxxx";
String charset = "UTF-8";
String CRLF = "\r\n";
int boundaryLength = 181;
try {
BufferedReader in = null;
File userss = new File("bytesExampleCSV.csv");
URL obj = new URL(url);
HttpsURLConnection conn = (HttpsURLConnection) obj.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
conn.setRequestProperty("User-Agent",
"Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Mobile Safari/537.36");
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Content-Length", String.valueOf((userss.length()) + boundaryLength));
conn.connect();
OutputStream output = conn.getOutputStream();
PrintWriter writer = new PrintWriter(new OutputStreamWriter(output, charset), true);
try {
writer.append("--").append(boundary).append(CRLF);
writer.append("Content-Disposition: form-data; name=\"bytesExampleCSV.csv\"; filename=\""
+ userss.getName() + "\"").append(CRLF);
writer.append("Content-Type: text/plain; charset=" + charset).append(CRLF);
writer.append(CRLF).flush();
Files.copy(userss, output);
output.flush();
// writer.append(CRLF);
writer.append("--" + boundary + "--").append(CRLF).flush();
writer.close();
conn.disconnect();
System.out.println(output);
} catch (Exception e) {
e.printStackTrace();
}
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