从特定行开始读取文件 [英] Begin the reading of a file from a specific line

问题描述

我有一个类似于这样的文件：
...

$ p $ 热点服务器JVM具有特定的代码 - 路径优化
＃这比客户端版本产生大约10％的增益。
export CATALINA_OPTS =$ CATALINA_OPTS -server
############# HDK1001 #############

＃禁用Java客户端的远程（分布式）垃圾收集
＃并移除应用程序调用显式GC收集的能力
export CATALINA_OPTS =$ CATALINA_OPTS -XX：+ DisableExplicitGC

＃在启动时检查应用程序特定的参数
if [-r$ CATALINA_BASE / bin / appenv.sh];那么
。 $ CATALINA_BASE / bin / appenv.sh
fi
############# HDK7564 #############
＃禁用Java客户端的远程（分布式）垃圾收集
＃并移除应用程序调用显式GC收集的能力
export CATALINA_OPTS =$ CATALINA_OPTS -XX：+ DisableExplicitGC

我想从存在单词HDK1001的行开始阅读并结束它在世界HDK7564的地方

我尝试了这段代码，但我无法做到这一点

  public static HashMap< String，String> getEnvVariables（String scriptFile，String config）{
 HashMap< String，String> vars = new HashMap< String，String>（）; 
尝试{
 
 FileInputStream fstream = new FileInputStream（scriptFile）; 
 BufferedReader br = new BufferedReader（new InputStreamReader（fstream））; 
字符串strLine; 
 String var =HDK1001; $（$ str 
 
） （$））{
 strLine = strLine.substring（7）; 
扫描仪扫描仪=新扫描仪（strLine）; 
 scanner.useDelimiter（=）; 
 if（scanner.hasNext（））{
 String name = scanner.next（）; 
字符串值= scanner.next（）; 
 System.out.println（name +=+ value）; 
 vars.put（name，value）; 
 
 
 $ / code $ / pre 
 $ b $ p请帮助我
 
 
 
  public static 
 
 HashMap< String，String> getEnvVariables（String scriptFile，
 String config）{
 HashMap< String，String> vars = new HashMap< String，String>（）; 
 BufferedReader br = null; 
尝试{
 FileInputStream fstream = new FileInputStream（scriptFile）; 
 br = new BufferedReader（new InputStreamReader（fstream））; 
 String strLine = null; 
 String stopvar =HDK7564; 
 String startvar =HDK1001; 
 String keyword =export; 
如果（strLine！= null&& strLine.contains（startvar））{
 if（strLine.contains（stopvar））{
 return vars; （strLine！= null&&！strLine.contains（stopvar））{
 strLine = br.readLine（）; 
 
 while（strLine！ 
 if（strLine.startsWith（keyword））{
 strLine = strLine.substring（keyword.length（））
 .trim（）; 
 String [] split = strLine.split（=）; 
 String name = split [0]; 
 String value = split [1]; 
 System.out.println（name +=+ value）; 
 vars.put（name，value）; （（strLine = br.readLine（））！= null）; $（
 
 
 
） 
} catch（Exception e）{
 e.printStackTrace（）; 
} 
 return vars; 
} 
  
 
i have a file similaire to this :
    ...
The hotspot server JVM has specific code-path optimizations
# which yield an approximate 10% gain over the client version.
export CATALINA_OPTS="$CATALINA_OPTS -server"
#############HDK1001#############

# Disable remote (distributed) garbage collection by Java clients
# and remove ability for applications to call explicit GC collection
export CATALINA_OPTS="$CATALINA_OPTS -XX:+DisableExplicitGC"

# Check for application specific parameters at startup
if [ -r "$CATALINA_BASE/bin/appenv.sh" ]; then
. "$CATALINA_BASE/bin/appenv.sh"
fi
 #############HDK7564#############
# Disable remote (distributed) garbage collection by Java clients
# and remove ability for applications to call explicit GC collection
export CATALINA_OPTS="$CATALINA_OPTS -XX:+DisableExplicitGC"
i want to begin the reading from the line where exists the word "HDK1001" and end it where the world "HDK7564"

i tryed with this code but i am unable to do the limitation
public static HashMap<String, String> getEnvVariables(String scriptFile,String config) {
    HashMap<String, String> vars = new HashMap<String, String>();
    try {

        FileInputStream fstream = new FileInputStream(scriptFile);
        BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
        String strLine;
        String var= "HDK1001";

        while ((strLine = br.readLine()) != null  ) {

            if (strLine.startsWith("export") && !strLine.contains("$")) {
                strLine = strLine.substring(7);
                Scanner scanner = new Scanner(strLine);
                scanner.useDelimiter("=");
                if (scanner.hasNext()) {
                    String name = scanner.next();
                    String value = scanner.next();
                    System.out.println(name+"="+value);
                    vars.put(name, value);
                }
            }
Help me please 
解决方案
try this code.
public static HashMap<String, String> getEnvVariables(String scriptFile,
            String config) {
        HashMap<String, String> vars = new HashMap<String, String>();
        BufferedReader br = null;
        try {
            FileInputStream fstream = new FileInputStream(scriptFile);
            br = new BufferedReader(new InputStreamReader(fstream));
            String strLine = null;
            String stopvar = "HDK7564";
            String startvar = "HDK1001";
            String keyword = "export";
            do {
                if (strLine != null && strLine.contains(startvar)) {
                    if (strLine.contains(stopvar)) {
                        return vars;
                    }
                    while (strLine != null && !strLine.contains(stopvar)) {
                        strLine = br.readLine();
                        if (strLine.startsWith(keyword)) {
                            strLine = strLine.substring(keyword.length())
                                    .trim();
                            String[] split = strLine.split("=");
                            String name = split[0];
                            String value = split[1];
                            System.out.println(name + "=" + value);
                            vars.put(name, value);
                        }
                    }
                }
            } while ((strLine = br.readLine()) != null);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return vars;
    }


                        
这篇关于从特定行开始读取文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！