如何刪除指定的開始和結束行中的文本在java中

Question

我正在使用java將腳本寫入帶有註釋的文本文件。在評論裏面，寫了我的sql腳本。我正在寫評論actions starts和actions ends並且我希望此評論中的腳本稍後會被其他腳本替換。 我怎樣才能刪除腳本它可指定註釋內和添加新的腳本。

-- 
-- `actions` starts 
-- 
CREATE TABLE IF NOT EXISTS `actions` (
    `aid` varchar(255) NOT NULL DEFAULT '0' COMMENT 'Primary Key: Unique actions ID.', 
    `type` varchar(32) NOT NULL DEFAULT '' COMMENT 'The object acts on ', 
    PRIMARY KEY (`aid`) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Stores action.'; 
-- 
-- `actions` ends 
-- 

-- 
-- `operations` starts 
-- 
CREATE TABLE IF NOT EXISTS `operations` (
    `type` varchar(32) NOT NULL DEFAULT '' COMMENT 'The object that that action acts on ', 
    `callback` varchar(255) NOT NULL DEFAULT '' COMMENT 'The callback ', 
    `parameters` longblob NOT NULL COMMENT 'Parameters to be passed to .', 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Stores operations.'; 
-- 
-- `operations` ends 
-- 

Answer 1

我找到了解決方案。解決方案是使用indexOf方法來識別開始和結束塊。即我使用的代碼是，

private static final String VARIABLE_FIELD = "variable"; 
private static final String END_MODULE_END_TAG = "' ends"; 
private static final String START_MODULE_END_TAG = "' starts"; 
private static final String MODULE_START_TAG = "-- '"; 
private static final String DOUBLE_HYPHEN = "--"; 
private static final String VALUE_FIELD = "value"; 
private static final String NAME_FIELD = "name"; 
private static final String SQL_VARIABLE_SEP = "`,`"; 
private static final String SQL_VALUE_SEP = "','"; 
private static final String SINGLE_QUOTE = "'"; 
private static final String LINE_BREAK = "\n"; 
private static final String EQUAL = "="; 

File scriptFile = new File(versionFile + File.separator + fileName); 
StringBuffer sb = new StringBuffer(); 
if (scriptFile.isFile()) { 
    // if script file is available need to replace the content 
    buff = new BufferedReader(new FileReader(scriptFile)); 
    String readBuff = buff.readLine(); 
    String sectionStarts = MODULE_START_TAG + moduleName + START_MODULE_END_TAG; 
    String sectionEnds = MODULE_START_TAG + moduleName + END_MODULE_END_TAG; 

    while (readBuff != null) { 
     sb.append(readBuff); 
     sb.append(LINE_BREAK); 
     readBuff = buff.readLine(); 
    } 

    int cnt1 = sb.indexOf(sectionStarts); 
    int cnt2 = sb.indexOf(sectionEnds); 
    if (cnt1 != -1 || cnt2 != -1) { 
     sb.replace(cnt1 + sectionStarts.length(), cnt2, LINE_BREAK + queryString + LINE_BREAK); 
    } else { 
     // if this module is not added already in the file and need to add this config alone 
     sb.append(LINE_BREAK + DOUBLE_HYPHEN + LINE_BREAK); 
     sb.append(MODULE_START_TAG + moduleName + START_MODULE_END_TAG + LINE_BREAK); 
     sb.append(queryString); 
     sb.append(LINE_BREAK); 
     sb.append(MODULE_START_TAG + moduleName + END_MODULE_END_TAG + LINE_BREAK); 
     sb.append(DOUBLE_HYPHEN + LINE_BREAK); 
    } 
} 

的鍵碼爲

INT CNT1 = sb.indexOf（sectionStarts）; int cnt2 = sb.indexOf（sectionEnds）; 如果（！CNT1 = -1 || CNT2 = -1）{ sb.replace（CNT1 + sectionStarts.length（），CNT2，LINE_BREAK +的queryString + LINE_BREAK）; }

int cnt1 = sb.indexOf（sectionStarts）;它標識了起始標籤和int cnt2 = sb.indexOf（sectionEnds）;標識結束標籤。

它會找到塊，將更換新的內容。