这是我第一次发送多部分请求,在这里挖掘之后,我更加困惑,所以任何关于"正确"的帮助方式将非常适合。
我有一个函数,应该得到:文件路径和JSON的String表示,并使用multipart向服务器发送POST请求。
我不确定何时使用boundary
和"multipart/form-data"
内容类型,以及addPart
和addTextBody
之间的差异,以及何时(或为什么)它总是写成Content-Disposition: form-data; name=\
public String foo(String filePath, String jsonRep, Proxy proxy)
{
File f = new File(filePath);
HttpURLConnection connection;
connection = (HttpURLConnection) url.openConnection(proxy);
connection.setRequestProperty("Content-Type", "multipart/form-data"); // How should I generate boundary? Should it be added here?
if (myMethod == "POST")
{
connection.getOutputStream().write( ? Both the json string and the file bytes?? );
}
.... checking there is no error code etc..
return ReadResponse(connection) // read input stream..
现在我不确定如何继续,以及如何编写文件和json字符串 我看到了这段代码:
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
builder.addPart("upfile", fileBody);
builder.addPart("text1", stringBody1);
builder.addPart("text2", stringBody2);
但我似乎无法理解它与connection
的关联方式。
你能帮忙吗?
答案 0 :(得分:3)
示例HTML表单:
<form method="post" action="http://127.0.0.1/app" enctype="multipart/form-data">
<input type="text" name="foo" value="bar"><br>
<input type="file" name="bin"><br>
<input type="submit" value="test">
</form>
用于提交多部分表单的Java代码:
MultipartEntityBuilder mb = MultipartEntityBuilder.create();//org.apache.http.entity.mime
mb.addTextBody("foo", "bar");
mb.addBinaryBody("bin", new File("testFilePath"));
org.apache.http.HttpEntity e = mb.build();
URLConnection conn = new URL("http://127.0.0.1:8080/app").openConnection();
conn.setDoOutput(true);
conn.addRequestProperty(e.getContentType().getName(), e.getContentType().getValue());//header "Content-Type"...
conn.addRequestProperty("Content-Length", String.valueOf(e.getContentLength()));
OutputStream fout = conn.getOutputStream();
e.writeTo(fout);//write multi part data...
fout.close();
conn.getInputStream().close();//output of remote url