ksino's diary

覚えたことを忘れないように、小さなことでも書いていく。

Commons FileUploadを試す

java

https://commons.apache.org/proper/commons-fileupload/

index.html

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="/UploadTest/FileUploadServlet" method="POST" enctype="multipart/form-data">
<input type="file" name="テキストファイルを選択"/>
<input type="submit" value="POST実行" />
</form>
</body>
</html>

FileUploadServlet.java

package jp.gr.java_conf.ksino.javaee.upload;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class FileUploadServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter writer = response.getWriter();

        DiskFileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload sfu = new ServletFileUpload(factory);

        StringBuilder sb = new StringBuilder();
        sb.append("<html><head><title>File Upload Test</title></head><body>");
        try {
            List<FileItem> list = sfu.parseRequest(request);
            sb.append(list.size() + "<br/>");
            Iterator<FileItem> iterator = list.iterator();
            while (iterator.hasNext()) {
                FileItem item = iterator.next();
                sb.append(item.getName() + "<br/>");        // ファイル名
                sb.append(item.getFieldName() + "<br/>");   // inputタグのname属性に設定した値
              }
        } catch (FileUploadException e) {
            sb.append(e);
            e.printStackTrace();
        } finally {
            sb.append("</body></html>");
            writer.write(sb.toString());
            writer.close();
        }
    }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>UploadTest</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>
  <servlet>
    <description></description>
    <display-name>FileUploadServlet</display-name>
    <servlet-name>FileUploadServlet</servlet-name>
    <servlet-class>jp.gr.java_conf.ksino.javaee.upload.FileUploadServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>FileUploadServlet</servlet-name>
    <url-pattern>/FileUploadServlet</url-pattern>
  </servlet-mapping>
</web-app>