Java子串缺少字符？

Question

我的以下代码有问题，我不确定从哪里开始：

                System.out.println("Subject: " + message.getSubject());
                subjectPack = message.getSubject().replaceAll("([,|!|@|$|&|%|^|*|;|:|<|>|\"|\'|(|)|/|\\|+])", "").replaceAll("[.](?![\\w]{2,4}$)", "").replaceAll("( )+|(\t)", " ");
                System.out.println("Subject Line Length: " + subjectPack.length());
                System.out.println("Subject: " + subjectPack);

                subjectPack = subjectPack.toUpperCase().substring(message.getSubject().lastIndexOf("#")+1).toUpperCase();
                System.out.println("PO Length: " + subjectPack.length());
                System.out.println("PO: " + subjectPack);
              subjectPack = subjectPack.substring(0,6);

它可以很好地处理除此示例以外的其他几个示例。为什么要踢“ 1”？

Subject: FW: Freight shifted on Turbana Load Po#160753
Subject Line Length: 44
Subject: FW Freight shifted on Turbana Load Po#160753
PO Length: 5
PO: 60753
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String ind
ex out of range: 6
        at java.lang.String.substring(Unknown Source)
        at picRead.PictureReader.sendmsg(PictureReader.java:191)
        at picRead.PictureReader.main(PictureReader.java:116)

Answer 1

您正在从subjectPack中提取采购订单， subjectPack message.getSubject()确定起始位置

    subjectPack.substring(message.getSubject().lastIndexOf("#")+1).toUpperCase();
//                        ^ you determine the starting position here
//  ^ you are extracting from this string

// "FW: Freight shifted on Turbana Load Po#160753"
// "FW Freight shifted on Turbana Load Po#160753"
//  you are extracting from ...            ^ this position

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附带说明：您不需要两次调用.toUpperCase() -在.substring()操作足够之前或之后。