Mirrors/Stirling-PDF
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performance: Use StringBuilder instead of string concatenation for building strings (#4193)

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Balázs Szücs 2025-09-06 21:27:11 +02:00 committed by GitHub
parent 47bce86ae2
commit 8192b1a44f
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3 changed files with 32 additions and 34 deletions
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10
app/common/src/main/java/stirling/software/common/util/PdfUtils.java
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@ -552,10 +552,10 @@ public class PdfUtils {
public boolean containsTextInFile(PDDocument pdfDocument, String text, String pagesToCheck)
throws IOException {
PDFTextStripper textStripper = new PDFTextStripper();
String pdfText = "";
StringBuilder pdfText = new StringBuilder();
if (pagesToCheck == null || "all".equals(pagesToCheck)) {
pdfText = textStripper.getText(pdfDocument);
pdfText = new StringBuilder(textStripper.getText(pdfDocument));
} else {
// remove whitespaces
pagesToCheck = pagesToCheck.replaceAll("\\s+", "");
@ -571,21 +571,21 @@ public class PdfUtils {
for (int i = startPage; i <= endPage; i++) {
textStripper.setStartPage(i);
textStripper.setEndPage(i);
pdfText += textStripper.getText(pdfDocument);
pdfText.append(textStripper.getText(pdfDocument));
}
} else {
// Handle individual page
int page = Integer.parseInt(splitPoint);
textStripper.setStartPage(page);
textStripper.setEndPage(page);
pdfText += textStripper.getText(pdfDocument);
pdfText.append(textStripper.getText(pdfDocument));
}
}
}
pdfDocument.close();
return pdfText.contains(text);
return pdfText.toString().contains(text);
}
public boolean pageCount(PDDocument pdfDocument, int pageCount, String comparator)

6
app/core/src/main/java/stirling/software/SPDF/controller/api/misc/AutoRenameController.java
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@ -94,14 +94,14 @@ public class AutoRenameController {
// Merge lines with same font size
List<LineInfo> mergedLineInfos = new ArrayList<>();
for (int i = 0; i < lineInfos.size(); i++) {
String mergedText = lineInfos.get(i).text;
StringBuilder mergedText = new StringBuilder(lineInfos.get(i).text);
float fontSize = lineInfos.get(i).fontSize;
while (i + 1 < lineInfos.size()
&& lineInfos.get(i + 1).fontSize == fontSize) {
mergedText += " " + lineInfos.get(i + 1).text;
mergedText.append(" ").append(lineInfos.get(i + 1).text);
i++;
}
mergedLineInfos.add(new LineInfo(mergedText, fontSize));
mergedLineInfos.add(new LineInfo(mergedText.toString(), fontSize));
}
// Sort lines by font size in descending order and get the first one

50
app/core/src/main/java/stirling/software/SPDF/controller/api/misc/ShowJavascript.java
View File

@ -1,8 +1,9 @@
package stirling.software.SPDF.controller.api.misc;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import io.github.pixee.security.Filenames;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import lombok.RequiredArgsConstructor;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.common.PDNameTreeNode;
import org.apache.pdfbox.pdmodel.interactive.action.PDActionJavaScript;
@ -13,17 +14,13 @@ import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import io.github.pixee.security.Filenames;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import lombok.RequiredArgsConstructor;
import stirling.software.common.model.api.PDFFile;
import stirling.software.common.service.CustomPDFDocumentFactory;
import stirling.software.common.util.WebResponseUtils;
import java.nio.charset.StandardCharsets;
import java.util.Map;
@RestController
@RequestMapping("/api/v1/misc")
@Tag(name = "Misc", description = "Miscellaneous APIs")
@ -38,7 +35,8 @@ public class ShowJavascript {
description = "desc. Input:PDF Output:JS Type:SISO")
public ResponseEntity<byte[]> extractHeader(@ModelAttribute PDFFile file) throws Exception {
MultipartFile inputFile = file.getFileInput();
String script = "";
StringBuilder script = new StringBuilder();
boolean foundScript = false;
try (PDDocument document = pdfDocumentFactory.load(inputFile)) {
@ -55,28 +53,28 @@ public class ShowJavascript {
PDActionJavaScript jsAction = entry.getValue();
String jsCodeStr = jsAction.getAction();
script +=
"// File: "
+ Filenames.toSimpleFileName(
inputFile.getOriginalFilename())
+ ", Script: "
+ name
+ "\n"
+ jsCodeStr
+ "\n";
if (jsCodeStr != null && !jsCodeStr.trim().isEmpty()) {
script.append("// File: ")
.append(Filenames.toSimpleFileName(inputFile.getOriginalFilename()))
.append(", Script: ")
.append(name)
.append("\n")
.append(jsCodeStr)
.append("\n");
foundScript = true;
}
}
}
}
if (script.isEmpty()) {
script =
"PDF '"
+ Filenames.toSimpleFileName(inputFile.getOriginalFilename())
+ "' does not contain Javascript";
if (!foundScript) {
script = new StringBuilder("PDF '")
.append(Filenames.toSimpleFileName(inputFile.getOriginalFilename()))
.append("' does not contain Javascript");
}
return WebResponseUtils.bytesToWebResponse(
script.getBytes(StandardCharsets.UTF_8),
script.toString().getBytes(StandardCharsets.UTF_8),
Filenames.toSimpleFileName(inputFile.getOriginalFilename()) + ".js",
MediaType.TEXT_PLAIN);
}