我正在使用以下代码制作zip并允许用户下载zip
但它不起作用。它显示为ZipArchive :: close（）错误：读取错误：文件描述符错误。可能是问题所在？我正在使用laravel。
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.util.LinkedList;
import javax.swing.JFrame;
public class LineDrawing extends Canvas {
int x1 = 5;
int y1 = 10;
int x2 = 105;
int y2 = 100;
double m = ((double) (y2 - y1)) / ((double) (x2 - x1));//slope
double b = y1 - (m * ((double) x1));//vertical shift
//Takes care of the domain we will loop between.
//min and max will be assigned minX and maxX if the line is not vertical.
//minY and maxY are assigned to min and max otherwise.
int minX = Math.min(x1, x2);//minimum x value we should consider
int maxX = Math.max(x1, x2);//maximum x value we should consider
int minY = Math.min(y1, y2);//minimum y value we should consider
int maxY = Math.max(y1, y2);//maximum y value we should consider
int min = 0;
int max = 0;
boolean plugX = true;//if true, the line is not vertical.
LinkedList<Point> points = new LinkedList<>();//Store all points here
public LineDrawing() {
if (x1 == x2) {//plug the y value instead the x, this is a vertical line.
plugX = false;
min = minY;
max = maxY;
} else {//dont change and plug x values.
min = minX;
max = maxX;
}
}
@Override
public void paint(Graphics g) {
super.paint(g);
//Draw the line, using default java drawLine in blue.
g.setColor(Color.BLUE);
g.drawLine(x1, y1, x2, y2);
//change the color to red, it will draw our verison.
g.setColor(Color.RED);
//Draw the points, point by point on screen.
//Plug m, x, and b in the formula y = m*x + b
//to obtain the y value.
//OR
//Plug m, y, and b in the formula x = (y - b) / m
//to obtain the x value if vertical line.
//Then plot (x,y) coordinate on screen and add the point to our linkedList.
for (int i = min; i <= max; i++) {
int obtained = 0;
if (plugX) {//not a vertical line
obtained = (int) Math.round((m * i + b));
System.out.println("x = " + i + " , y = " + obtained);
points.add(new Point(i, obtained));
//Uncomment to see the full blue line.
g.drawLine(i, obtained, i, obtained);
} else {//vertical line
obtained = (int) Math.round((double) (i - b) / (double) m);
System.out.println("x = " + x1 + " , y = " + i);
g.drawLine(x1, i, x1, i);//Uncomment to see the full blue line.
points.add(new Point(x1, i));
}
}
//Print out the number of points as well as the coordinates themselves.
System.out.println("Total points: " + points.size());
for (int i = 0; i < points.size(); i++) {
System.out.println(i + " ( " + points.get(i).x
+ ", " + points.get(i).y + " )");
}
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setSize(120, 150);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new LineDrawing());
frame.setVisible(true);
}
}
答案 0 :(得分：2)
我建议您使用Zipper软件包
尝试下面的代码来创建多个文件的zip：
public function downloadZip($id)
{
$headers = ["Content-Type"=>"application/zip"];
$fileName = $id.".zip"; // name of zip
Zipper::make(public_path('/documents/'.$id.'.zip')) //file path for zip file
->add(public_path()."/documents/".$id.'/')->close(); //files to be zipped
return response()
->download(public_path('/documents/'.$fileName),$fileName, $headers);
}
答案 1 :(得分：2)
仅纯PHP代码。
public function makeZipWithFiles(string $zipPathAndName, array $filesAndPaths): void
{
$zip = new ZipArchive();
$tempFile = tmpfile();
$tempFileUri = stream_get_meta_data($tempFile)['uri'];
if ($zip->open($tempFileUri, ZipArchive::CREATE) === TRUE) {
// Add File in ZipArchive
foreach($filesAndPaths as $file)
{
if (! $zip->addFile($file, basename($file))) {
echo 'Could not add file to ZIP: ' . $file;
}
}
// Close ZipArchive
$zip->close();
} else {
echo 'Could not open ZIP file.';
}
echo 'Path:' . $zipPathAndName;
rename($tempFileUri, $zipPathAndName);
}
答案 2 :(得分：1)
在api.php
Route::get('/downloadZip','ZipController@download')->name('download');
创建控制器ZipController.php
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use File;
class ZipController extends Controller
{
public function download(Request $request)
{
$zip = new \ZipArchive();
$fileName = 'zipFile.zip';
if ($zip->open(public_path($fileName), \ZipArchive::CREATE)== TRUE)
{
$files = File::files(public_path('myFiles'));
foreach ($files as $key => $value){
$relativeName = basename($value);
$zip->addFile($value, $relativeName);
}
$zip->close();
}
return response()->download(public_path($fileName));
}
}
在public文件夹中，确保您有一个文件夹myFiles。此代码段将获取文件夹中的每个文件，创建一个新的zip文件，并将其放入public文件夹中，然后在调用route时，它将返回创建的zip文件。
答案 3 :(得分：0)
您可以使用以下代码
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\ImgUpload;
use ZipArchive;
use File;
class UserController extends Controller
{
/**
* Function to get all images from DB
*/
public function downloadZip()
{
$data = ImgUpload::all();
foreach($data as $key => $value)
{
$imgarr[] = "storage/image". '/' . $value->image;
}
$ziplink = $this->converToZip($imgarr);
return $ziplink;
}
/**
* Function to covert all DB files to Zip
*/
public function converToZip($imgarr)
{
$zip = new ZipArchive;
$storage_path = 'storage/image';
$timeName = time();
$zipFileName = $storage_path . '/' . $timeName . '.zip';
$zipPath = asset($zipFileName);
if ($zip->open(($zipFileName), ZipArchive::CREATE) === true) {
foreach ($imgarr as $relativName) {
$zip->addFile($relativName,"/".$timeName."/".basename($relativName));
}
$zip->close();
if ($zip->open($zipFileName) === true) {
return $zipPath;
} else {
return false;
}
}
}
}
您可以参考this link了解更多信息