我設計了一個 servlet 來讀取 CSV，并且我將 CSV 作為表單數據從郵遞員傳遞，但我無法獲得任何讀取該數據的選項。我試過下面的代碼String body = request.getReader().lines().collect(Collectors.joining());我得到了一個巨大的字符串，但我不知道如何解析這個字符串。----------------------------140780421327043896517058Content-Disposition: form-data; name="CSVfile"; filename="dummyDataSet.csv"Content-Type: text/csvID,Name ,Age,Address,State,Date,Salary1,Airi Satou,33,Tokyo,Tokyo,11/28/2008,"$162,700 "2,Angelica Ramos,47,London,London,10/9/2009,"$162,700 "3,Ashton Cox,66,San Francisco,San Francisco,1/12/2009,"$86,000 "4,Bradley Greer,41,London,London,10/13/2012,"$132,000 "5,Brenden Wagner,28,San Francisco,San Francisco,6/7/2011,"$206,850 "6,Brielle Williamson,61,New York,New York,12/2/2012,"$372,000 "7,Bruno Nash,38,London,London,5/3/2011,"$163,500 "8,Caesar Vance,21,New York,New York,12/12/2011,"$106,450 "9,Cara Stevens,46,New York,New York,12/6/2011,"$145,600 "10,Cedric Kelly,22,Edinburgh,Edinburgh,3/29/2012,"$433,060 "----------------------------140780421327043896517058--你能幫我嗎，如何讀取CSV數據。
1 回答
智慧大石
TA貢獻1946條經驗 獲得超3個贊
使用request.getParts()orrequest.getPart(name)讀取多部分內容并向 servlet 添加 @MultipartConfig 注釋。
干得好：
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.stream.Collectors;
@WebServlet(urlPatterns = "/upload")
@MultipartConfig
public class MyFileUploadServelt extends HttpServlet {
private static final String CONTENT_DISPOSITION_KEY = "content-disposition";
private static final String FILE_NAME_KEY = "filename";
private static final int BUFFER_SIZE = 2048;
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("Content Type: " + req.getContentType());
System.out.println("Content Length: " + req.getContentLength());
System.out.println("Parts: " + req.getParts().toString());
System.out.println("Part 1: " + req.getPart("myfile"));
// Read parts. Also can be read by directly calling req.getPart(fileName)
for (Part part : req.getParts()) {
System.out.println("File Name: " + getFileName(part));
System.out.println("File Content: " + getTextFromPart(part));
}
}
private String getFileName(Part part) {
for (String contentDisposition : part.getHeader(CONTENT_DISPOSITION_KEY).split(";")) {
if (contentDisposition.trim().startsWith(FILE_NAME_KEY)) {
return contentDisposition.substring(contentDisposition.indexOf('=') + 1).trim().replace("\"", "");
}
}
return null;
}
private String getTextFromPart(Part part) throws IOException {
BufferedReader reader =
new BufferedReader(new InputStreamReader(part.getInputStream(), "UTF-8"));
StringBuilder value = new StringBuilder();
char[] buffer = new char[BUFFER_SIZE];
for (int length = 0; (length = reader.read(buffer)) > 0; ) {
value.append(buffer, 0, length);
}
return value.toString();
}
}
添加回答
舉報
0/150
提交
取消