同一段代码 不同项目出现问题

Question

我的同一段代码在一个项目中有问题

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -740
at java.lang.AbstractStringBuilder.substring(AbstractStringBuilder.java:881)
at java.lang.StringBuffer.substring(StringBuffer.java:416)
at org.apache.poi.hwpf.model.TextPiece.substring(TextPiece.java:87)
at org.textmining.text.extraction.WordExtractor.extractText(WordExtractor.java:179)
at com.searchforyou.read.ReadWord.getWordStr(ReadWord.java:38)
at com.searchforyou.read.ReadWord.main(ReadWord.java:24)
[color=darkred]
但是再新建一个项目，同一段代码就可以很好的执行。[/color]
[color=red]代码如下[/color]package com.searchforyou.read;
import java.net.HttpURLConnection;
import java.net.URL;
import org.textmining.text.extraction.WordExtractor;

public class ReadWord {

public ReadWord() {
}

public static void main(String args[]) throws Exception
{
String url="http://127.0.0.1:8080/WebContent/aa.doc";

  String s="";
  s=ReadWord.getWordStr(url);
  System.out.println(s);

}

public static String getWordStr(String filename) throws Exception{

  URL url = new URL(filename);
  HttpURLConnection connection = (HttpURLConnection) url.openConnection();
  WordExtractor extractor = new WordExtractor();
  String str = extractor.extractText(connection.getInputStream());
  return str;

}

}

[b]问题补充：[/b]
我在同个机子的 建一个新的web项目 ，jdk版本是一样的，jar包也都引进，但新的项目只有这一段代码。原来的项目还有struts等。
TextPiece.substring()？？
那就是这个类里面的class文件了。怎么去修改呢？

Answer 1

[code="java"]Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -740
at java.lang.AbstractStringBuilder.substring(AbstractStringBuilder.java:881)
at java.lang.StringBuffer.substring(StringBuffer.java:416)
at org.apache.poi.hwpf.model.TextPiece.substring(TextPiece.java:87) [/code]

看提示, 应该是说TextPiece.substring()的时候出的错,

[code="java"] public String substring(int start, int end) {
if (start < 0) // start 比0小
throw new StringIndexOutOfBoundsException(start);
if (end > count) // end比总长大
throw new StringIndexOutOfBoundsException(end);
if (start > end) // start比end大
throw new StringIndexOutOfBoundsException(end - start);
return new String(value, start, end - start);
}[/code]

[quote]Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -740 [/quote]

抛的异常是-740, 所以,
1. 要么是start比0小, start的值是-740.
2. 要么是end-start = -740.

还是要具体debug你自己的代码才行.