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我在Eclipse工作區導入了this項目。我試圖運行該項目，但它說我不可能找到或加載主類，但有是 a MainClass！無法在eclipse中導入項目：「無法找到或加載主類」
這是MainClass的代碼：
package com.yeokhengmeng.docstopdfconverter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.kohsuke.args4j.CmdLineException;
import org.kohsuke.args4j.CmdLineParser;
import org.kohsuke.args4j.Option;
public class MainClass{
public static final String VERSION_STRING = "\nDocs to PDF Converter Version 1.7 (8 Dec 2013)\n\nThe MIT License (MIT)\nCopyright (c) 2013-2014 Yeo Kheng Meng";
public enum DOC_TYPE {
DOC,
DOCX,
PPT,
PPTX,
ODT
}
public static void main(String[] args){
Converter converter;
try{
converter = processArguments(args);
} catch (Exception e){
System.out.println("\n\nInput\\Output file not specified properly.");
return;
}
if(converter == null){
System.out.println("Unable to determine type of input file.");
} else {
try {
converter.convert();
} catch (Exception e) {
e.printStackTrace();
}
}
}
public static Converter processArguments(String[] args) throws Exception{
CommandLineValues values = new CommandLineValues();
CmdLineParser parser = new CmdLineParser(values);
Converter converter = null;
try {
parser.parseArgument(args);
boolean version = values.version;
if(version){
System.out.println(VERSION_STRING);
System.exit(0);
}
String inPath = values.inFilePath;
String outPath = values.outFilePath;
boolean shouldShowMessages = values.verbose;
if(inPath == null){
parser.printUsage(System.err);
throw new IllegalArgumentException();
}
if(outPath == null){
outPath = changeExtensionToPDF(inPath);
}
String lowerCaseInPath = inPath.toLowerCase();
InputStream inStream = getInFileStream(inPath);
OutputStream outStream = getOutFileStream(outPath);
if(values.type == null){
if(lowerCaseInPath.endsWith("doc")){
converter = new DocToPDFConverter(inStream, outStream, shouldShowMessages, true);
} else if (lowerCaseInPath.endsWith("docx")){
converter = new DocxToPDFConverter(inStream, outStream, shouldShowMessages, true);
} else if(lowerCaseInPath.endsWith("ppt")){
converter = new PptToPDFConverter(inStream, outStream, shouldShowMessages, true);
} else if(lowerCaseInPath.endsWith("pptx")){
converter = new PptxToPDFConverter(inStream, outStream, shouldShowMessages, true);
} else if(lowerCaseInPath.endsWith("odt")){
converter = new OdtToPDF(inStream, outStream, shouldShowMessages, true);
} else {
converter = null;
}
} else {
switch(values.type){
case DOC: converter = new DocToPDFConverter(inStream, outStream, shouldShowMessages, true);
break;
case DOCX: converter = new DocxToPDFConverter(inStream, outStream, shouldShowMessages, true);
break;
case PPT: converter = new PptToPDFConverter(inStream, outStream, shouldShowMessages, true);
break;
case PPTX: converter = new PptxToPDFConverter(inStream, outStream, shouldShowMessages, true);
break;
case ODT: converter = new OdtToPDF(inStream, outStream, shouldShowMessages, true);
break;
default: converter = null;
break;
}
}
} catch (CmdLineException e) {
// handling of wrong arguments
System.err.println(e.getMessage());
parser.printUsage(System.err);
}
return converter;
}
public static class CommandLineValues {
@Option(name = "-type", aliases = "-t", required = false, usage = "Specifies doc converter. Leave blank to let program decide by input extension.")
public DOC_TYPE type = null;
@Option(name = "-inputPath", aliases = {"-i", "-in", "-input"}, required = false, metaVar = "<path>",
usage = "Specifies a path for the input file.")
public String inFilePath = null;
@Option(name = "-outputPath", aliases = {"-o", "-out", "-output"}, required = false, metaVar = "<path>",
usage = "Specifies a path for the output PDF.")
public String outFilePath = null;
@Option(name = "-verbose", aliases = {"-v"}, required = false, usage = "To see intermediate processing messages.")
public boolean verbose = false;
@Option(name = "-version", aliases = {"-ver"}, required = false, usage = "To view version code.")
public boolean version = false;
}
//From http://stackoverflow.com/questions/941272/how-do-i-trim-a-file-extension-from-a-string-in-java
public static String changeExtensionToPDF(String originalPath) {
// String separator = System.getProperty("file.separator");
String filename = originalPath;
// // Remove the path upto the filename.
// int lastSeparatorIndex = originalPath.lastIndexOf(separator);
// if (lastSeparatorIndex == -1) {
// filename = originalPath;
// } else {
// filename = originalPath.substring(lastSeparatorIndex + 1);
// }
// Remove the extension.
int extensionIndex = filename.lastIndexOf(".");
String removedExtension;
if (extensionIndex == -1){
removedExtension = filename;
} else {
removedExtension = filename.substring(0, extensionIndex);
}
String addPDFExtension = removedExtension + ".pdf";
return addPDFExtension;
}
protected static InputStream getInFileStream(String inputFilePath) throws FileNotFoundException{
File inFile = new File(inputFilePath);
FileInputStream iStream = new FileInputStream(inFile);
return iStream;
}
protected static OutputStream getOutFileStream(String outputFilePath) throws IOException{
File outFile = new File(outputFilePath);
try{
//Make all directories up to specified
outFile.getParentFile().mkdirs();
} catch (NullPointerException e){
//Ignore error since it means not parent directories
}
outFile.createNewFile();
FileOutputStream oStream = new FileOutputStream(outFile);
return oStream;
}
}
有這個類沒有錯誤，沒有在其他類項目。
我已經試過您的解決方案，但當我導入項目總有一些類，埃奇無法找到... – Clyky
我使用java：1.8.0_141和maven：Apache Maven 3.0.5。我能夠使用eclipse和普通的maven REPL來構建這個項目。 – Abhi
非常感謝，我一直遵循你的解決方案，也感謝Google解決一些其他小問題，我管理這個項目運行完美:) – Clyky