Java 如何在lastindexof中获取相同匹配的多个字符串？ 如何在lastindexof中获取相同匹配的多个字符串？

在这里，我想得到两个字符串，在lastindexof中，从08:24:49到08:24:52，但是它只打印一个08:24:52，但是我想得到两个08:24:52

2017-05-05 08:24:49408警告

public class MeteringlogBean implements Serializable {

private static final long serialVersionUID = 1L;
private Date date10;
private Date date11;
private String d;
private String d1;
private String s;
private String text;
private FileWriter fw;
private BufferedWriter bw;
private String Fn = "C:/Users/swetha.papireddy/Documents/new/filename.txt";

public Date getDate11() {
    return date11;
}

public void setDate11(Date date11) {
    this.date11 = date11;

}

private String environment;

public String getEnvironment() {

    return environment;
}

public void setEnvironment(String environment) {

    this.environment = environment;
}

public Date getDate10() {
    return date10;
}

public void setDate10(Date date10) {
    this.date10 = date10;
}

public void save() throws IOException, NullPointerException {

    try {
        File file = new File(getEnvironment() + "/ischange.log");
        FileReader fileReader = new FileReader(file);
        BufferedReader bufferedReader = new BufferedReader(fileReader);
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            stringBuilder.append(line);
            stringBuilder.append("\n");
        }
        fileReader.close();

        System.out.println("Contents of file:");
        s = stringBuilder.toString();
        System.out.println(s);

    } catch (IOException e) {
        e.printStackTrace();
    }

    // System.out.println(date10);
    d = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date10);
    System.out.println("date:-" + d);
    d1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date11);
    System.out.println("date:-" + d1);
    fw = new FileWriter(Fn);
    bw = new BufferedWriter(fw);
    bw.write(s);
    bw.close();

    File file = new File(Fn);
    FileInputStream fis = new FileInputStream(file);
    byte[] bytes = new byte[(int) file.length()];
    fis.read(bytes);
    fis.close();
    String text = new String(bytes, "UTF-8");
    String str1 = new String(d);
    String str2 = new String(d1);
    System.out.println(text.substring(text.indexOf(str1),
            text.lastIndexOf(str2)));
}

2017-05-05 08:24:49408警告

public class MeteringlogBean implements Serializable {

private static final long serialVersionUID = 1L;
private Date date10;
private Date date11;
private String d;
private String d1;
private String s;
private String text;
private FileWriter fw;
private BufferedWriter bw;
private String Fn = "C:/Users/swetha.papireddy/Documents/new/filename.txt";

public Date getDate11() {
    return date11;
}

public void setDate11(Date date11) {
    this.date11 = date11;

}

private String environment;

public String getEnvironment() {

    return environment;
}

public void setEnvironment(String environment) {

    this.environment = environment;
}

public Date getDate10() {
    return date10;
}

public void setDate10(Date date10) {
    this.date10 = date10;
}

public void save() throws IOException, NullPointerException {

    try {
        File file = new File(getEnvironment() + "/ischange.log");
        FileReader fileReader = new FileReader(file);
        BufferedReader bufferedReader = new BufferedReader(fileReader);
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            stringBuilder.append(line);
            stringBuilder.append("\n");
        }
        fileReader.close();

        System.out.println("Contents of file:");
        s = stringBuilder.toString();
        System.out.println(s);

    } catch (IOException e) {
        e.printStackTrace();
    }

    // System.out.println(date10);
    d = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date10);
    System.out.println("date:-" + d);
    d1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date11);
    System.out.println("date:-" + d1);
    fw = new FileWriter(Fn);
    bw = new BufferedWriter(fw);
    bw.write(s);
    bw.close();

    File file = new File(Fn);
    FileInputStream fis = new FileInputStream(file);
    byte[] bytes = new byte[(int) file.length()];
    fis.read(bytes);
    fis.close();
    String text = new String(bytes, "UTF-8");
    String str1 = new String(d);
    String str2 = new String(d1);
    System.out.println(text.substring(text.indexOf(str1),
            text.lastIndexOf(str2)));
}

2017-05-05 08:24:52408警告

public class MeteringlogBean implements Serializable {

private static final long serialVersionUID = 1L;
private Date date10;
private Date date11;
private String d;
private String d1;
private String s;
private String text;
private FileWriter fw;
private BufferedWriter bw;
private String Fn = "C:/Users/swetha.papireddy/Documents/new/filename.txt";

public Date getDate11() {
    return date11;
}

public void setDate11(Date date11) {
    this.date11 = date11;

}

private String environment;

public String getEnvironment() {

    return environment;
}

public void setEnvironment(String environment) {

    this.environment = environment;
}

public Date getDate10() {
    return date10;
}

public void setDate10(Date date10) {
    this.date10 = date10;
}

public void save() throws IOException, NullPointerException {

    try {
        File file = new File(getEnvironment() + "/ischange.log");
        FileReader fileReader = new FileReader(file);
        BufferedReader bufferedReader = new BufferedReader(fileReader);
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            stringBuilder.append(line);
            stringBuilder.append("\n");
        }
        fileReader.close();

        System.out.println("Contents of file:");
        s = stringBuilder.toString();
        System.out.println(s);

    } catch (IOException e) {
        e.printStackTrace();
    }

    // System.out.println(date10);
    d = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date10);
    System.out.println("date:-" + d);
    d1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date11);
    System.out.println("date:-" + d1);
    fw = new FileWriter(Fn);
    bw = new BufferedWriter(fw);
    bw.write(s);
    bw.close();

    File file = new File(Fn);
    FileInputStream fis = new FileInputStream(file);
    byte[] bytes = new byte[(int) file.length()];
    fis.read(bytes);
    fis.close();
    String text = new String(bytes, "UTF-8");
    String str1 = new String(d);
    String str2 = new String(d1);
    System.out.println(text.substring(text.indexOf(str1),
            text.lastIndexOf(str2)));
}

String text ="2017-05-05 08:24:49,408 WARN 2017-05-05 08:24:49,408 WARN 2017-05-05 08:24:52,408 WARN 2017-05-05 08:24:52,408 WARN";
        String searchStr = "08:24:52";
        while(text.length()>= searchStr.length() && text.contains(searchStr)){
            text = text.substring(text.indexOf(searchStr)+searchStr.length());
            System.out.println(searchStr);
        }

2017-05-05 08:24:52408警告

public class MeteringlogBean implements Serializable {

private static final long serialVersionUID = 1L;
private Date date10;
private Date date11;
private String d;
private String d1;
private String s;
private String text;
private FileWriter fw;
private BufferedWriter bw;
private String Fn = "C:/Users/swetha.papireddy/Documents/new/filename.txt";

public Date getDate11() {
    return date11;
}

public void setDate11(Date date11) {
    this.date11 = date11;

}

private String environment;

public String getEnvironment() {

    return environment;
}

public void setEnvironment(String environment) {

    this.environment = environment;
}

public Date getDate10() {
    return date10;
}

public void setDate10(Date date10) {
    this.date10 = date10;
}

public void save() throws IOException, NullPointerException {

    try {
        File file = new File(getEnvironment() + "/ischange.log");
        FileReader fileReader = new FileReader(file);
        BufferedReader bufferedReader = new BufferedReader(fileReader);
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            stringBuilder.append(line);
            stringBuilder.append("\n");
        }
        fileReader.close();

        System.out.println("Contents of file:");
        s = stringBuilder.toString();
        System.out.println(s);

    } catch (IOException e) {
        e.printStackTrace();
    }

    // System.out.println(date10);
    d = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date10);
    System.out.println("date:-" + d);
    d1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date11);
    System.out.println("date:-" + d1);
    fw = new FileWriter(Fn);
    bw = new BufferedWriter(fw);
    bw.write(s);
    bw.close();

    File file = new File(Fn);
    FileInputStream fis = new FileInputStream(file);
    byte[] bytes = new byte[(int) file.length()];
    fis.read(bytes);
    fis.close();
    String text = new String(bytes, "UTF-8");
    String str1 = new String(d);
    String str2 = new String(d1);
    System.out.println(text.substring(text.indexOf(str1),
            text.lastIndexOf(str2)));
}

String text ="2017-05-05 08:24:49,408 WARN 2017-05-05 08:24:49,408 WARN 2017-05-05 08:24:52,408 WARN 2017-05-05 08:24:52,408 WARN";
        String searchStr = "08:24:52";
        while(text.length()>= searchStr.length() && text.contains(searchStr)){
            text = text.substring(text.indexOf(searchStr)+searchStr.length());
            System.out.println(searchStr);
        }

输出： 2017-05-05 08:24:49408警告

public class MeteringlogBean implements Serializable {

private static final long serialVersionUID = 1L;
private Date date10;
private Date date11;
private String d;
private String d1;
private String s;
private String text;
private FileWriter fw;
private BufferedWriter bw;
private String Fn = "C:/Users/swetha.papireddy/Documents/new/filename.txt";

public Date getDate11() {
    return date11;
}

public void setDate11(Date date11) {
    this.date11 = date11;

}

private String environment;

public String getEnvironment() {

    return environment;
}

public void setEnvironment(String environment) {

    this.environment = environment;
}

public Date getDate10() {
    return date10;
}

public void setDate10(Date date10) {
    this.date10 = date10;
}

public void save() throws IOException, NullPointerException {

    try {
        File file = new File(getEnvironment() + "/ischange.log");
        FileReader fileReader = new FileReader(file);
        BufferedReader bufferedReader = new BufferedReader(fileReader);
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            stringBuilder.append(line);
            stringBuilder.append("\n");
        }
        fileReader.close();

        System.out.println("Contents of file:");
        s = stringBuilder.toString();
        System.out.println(s);

    } catch (IOException e) {
        e.printStackTrace();
    }

    // System.out.println(date10);
    d = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date10);
    System.out.println("date:-" + d);
    d1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date11);
    System.out.println("date:-" + d1);
    fw = new FileWriter(Fn);
    bw = new BufferedWriter(fw);
    bw.write(s);
    bw.close();

    File file = new File(Fn);
    FileInputStream fis = new FileInputStream(file);
    byte[] bytes = new byte[(int) file.length()];
    fis.read(bytes);
    fis.close();
    String text = new String(bytes, "UTF-8");
    String str1 = new String(d);
    String str2 = new String(d1);
    System.out.println(text.substring(text.indexOf(str1),
            text.lastIndexOf(str2)));
}

2017-05-05 08:24:49408警告

public class MeteringlogBean implements Serializable {

private static final long serialVersionUID = 1L;
private Date date10;
private Date date11;
private String d;
private String d1;
private String s;
private String text;
private FileWriter fw;
private BufferedWriter bw;
private String Fn = "C:/Users/swetha.papireddy/Documents/new/filename.txt";

public Date getDate11() {
    return date11;
}

public void setDate11(Date date11) {
    this.date11 = date11;

}

private String environment;

public String getEnvironment() {

    return environment;
}

public void setEnvironment(String environment) {

    this.environment = environment;
}

public Date getDate10() {
    return date10;
}

public void setDate10(Date date10) {
    this.date10 = date10;
}

public void save() throws IOException, NullPointerException {

    try {
        File file = new File(getEnvironment() + "/ischange.log");
        FileReader fileReader = new FileReader(file);
        BufferedReader bufferedReader = new BufferedReader(fileReader);
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            stringBuilder.append(line);
            stringBuilder.append("\n");
        }
        fileReader.close();

        System.out.println("Contents of file:");
        s = stringBuilder.toString();
        System.out.println(s);

    } catch (IOException e) {
        e.printStackTrace();
    }

    // System.out.println(date10);
    d = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date10);
    System.out.println("date:-" + d);
    d1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date11);
    System.out.println("date:-" + d1);
    fw = new FileWriter(Fn);
    bw = new BufferedWriter(fw);
    bw.write(s);
    bw.close();

    File file = new File(Fn);
    FileInputStream fis = new FileInputStream(file);
    byte[] bytes = new byte[(int) file.length()];
    fis.read(bytes);
    fis.close();
    String text = new String(bytes, "UTF-8");
    String str1 = new String(d);
    String str2 = new String(d1);
    System.out.println(text.substring(text.indexOf(str1),
            text.lastIndexOf(str2)));
}

2017-05-05 08:24:52408警告

public class MeteringlogBean implements Serializable {

private static final long serialVersionUID = 1L;
private Date date10;
private Date date11;
private String d;
private String d1;
private String s;
private String text;
private FileWriter fw;
private BufferedWriter bw;
private String Fn = "C:/Users/swetha.papireddy/Documents/new/filename.txt";

public Date getDate11() {
    return date11;
}

public void setDate11(Date date11) {
    this.date11 = date11;

}

private String environment;

public String getEnvironment() {

    return environment;
}

public void setEnvironment(String environment) {

    this.environment = environment;
}

public Date getDate10() {
    return date10;
}

public void setDate10(Date date10) {
    this.date10 = date10;
}

public void save() throws IOException, NullPointerException {

    try {
        File file = new File(getEnvironment() + "/ischange.log");
        FileReader fileReader = new FileReader(file);
        BufferedReader bufferedReader = new BufferedReader(fileReader);
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            stringBuilder.append(line);
            stringBuilder.append("\n");
        }
        fileReader.close();

        System.out.println("Contents of file:");
        s = stringBuilder.toString();
        System.out.println(s);

    } catch (IOException e) {
        e.printStackTrace();
    }

    // System.out.println(date10);
    d = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date10);
    System.out.println("date:-" + d);
    d1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date11);
    System.out.println("date:-" + d1);
    fw = new FileWriter(Fn);
    bw = new BufferedWriter(fw);
    bw.write(s);
    bw.close();

    File file = new File(Fn);
    FileInputStream fis = new FileInputStream(file);
    byte[] bytes = new byte[(int) file.length()];
    fis.read(bytes);
    fis.close();
    String text = new String(bytes, "UTF-8");
    String str1 = new String(d);
    String str2 = new String(d1);
    System.out.println(text.substring(text.indexOf(str1),
            text.lastIndexOf(str2)));
}

String text ="2017-05-05 08:24:49,408 WARN 2017-05-05 08:24:49,408 WARN 2017-05-05 08:24:52,408 WARN 2017-05-05 08:24:52,408 WARN";
        String searchStr = "08:24:52";
        while(text.length()>= searchStr.length() && text.contains(searchStr)){
            text = text.substring(text.indexOf(searchStr)+searchStr.length());
            System.out.println(searchStr);
        }

---

希望这能回答您的问题。

我真的不明白您想要做什么，但我认为您不能使用通用字符串类。 为什么不使用Pattern和Match类来找出这种情况下的字符串呢

您提供的代码没有为我完成，因此，我对其进行了修改，添加了一小段代码

然后，如果我有下面这样的日志文件格式

ischange.log文件

我生成的最终输出文件没有空字符串，名为ischange.log.out，如

2017-05-05 08:24:49,408 WARN
2017-05-05 08:24:49,408 WARN
2017-05-05 08:24:52,408 WARN
2017-05-05 08:24:52,408 WARN

完整的源代码在这里

    private String getEnvironment() {
    return ".";
}

public void save() throws IOException, NullPointerException {
    String s = null;
    String d = null, d1 = null;
    Date date10 = new Date();
    Date date11 = new Date();

    BufferedWriter bw = null;
    String Fn = getEnvironment() + "/ischange.log.out";
    BufferedReader bufferedReader = null;
    TreeMap<String, String> hashStore = new TreeMap<String, String>();
    FileInputStream fis = null;

    try {
        File file = new File(getEnvironment() + "/ischange.log");

        if (!file.exists())
            return;

        bufferedReader = new BufferedReader(new FileReader(file));
        StringBuffer stringBuffer = new StringBuffer();

        String line;
        while ((line = bufferedReader.readLine()) != null) {
            if (line.equals(""))
                continue;

            stringBuffer.append(line);
            stringBuffer.append("\n");

            StringTokenizer st = new StringTokenizer(line, ",");

            if (st.countTokens() != 2)
                continue;

            hashStore.put(st.nextToken(), st.nextToken());
        }

        System.out.println("Contents of file:");
        s = stringBuffer.toString();
        System.out.println(s);

    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        bufferedReader.close();
    }

    Set<String> eSet = hashStore.keySet();
    String[] outDate = new String[2];
    outDate = eSet.toArray(outDate);
    try {
        date10 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(outDate[0]);
        date11 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(outDate[1]);
    } catch (ParseException e) {
        e.printStackTrace();
    }

    String formatStr = "yyyy-MM-dd HH:mm:ss";
    formatStr = "HH:mm:ss";

    d = new SimpleDateFormat(formatStr).format(date10);
    System.out.println("date:- " + d);
    d1 = new SimpleDateFormat(formatStr).format(date11);
    System.out.println("date:- " + d1);

    try
    {
        bw = new BufferedWriter(new FileWriter(Fn));
        bw.write(s);
    }
    finally
    {
        bw.close();
    }

    byte[] contents = null;

    try
    {
        int len = s.getBytes().length;
        fis = new FileInputStream(new File(Fn));
        contents = new byte[len];
        fis.read(contents, 0, len);
    }
    finally
    {
        fis.close();
    }

    String text = new String(contents, "UTF-8");

    Pattern pattern = Pattern.compile(d);
    Matcher matcher = pattern.matcher(text);

    while (matcher.find()) {
        System.out.println(" match : " + matcher.group());
    } 

    pattern = Pattern.compile(d1);
    matcher = pattern.matcher(text);
    while (matcher.find()) {
        System.out.println(" match : " + matcher.group());
    } 

    // String text = new String(bytes, "UTF-8");
    //String str1 = new String(d);
    //String str2 = new String(d1);

    //int index = text.indexOf(str1);
    //int indexlast = text.lastIndexOf(str2);
    //System.out.println("index:- " + index + " indexlast: " + indexlast);

    // System.out.println(text.substring(index,indexlast));

    //System.out.println(text.substring(text.indexOf(str1), text.lastIndexOf(str2)));
}

public static void main(String[] args) {
    try {
        new StringTest().save();
    } catch (NullPointerException | IOException e) {
        e.printStackTrace();
    }
}

使用TreeMap逐行读取字符串，同时对其进行排序

TreeMap<String, String> hashStore = new TreeMap<String, String>();
...
while ((line = bufferedReader.readLine()) != null) {
                if (line.equals(""))
                    continue;

                stringBuffer.append(line);
                stringBuffer.append("\n");

                StringTokenizer st = new StringTokenizer(line, ",");

                if (st.countTokens() != 2)
                    continue;

                hashStore.put(st.nextToken(), st.nextToken());
            }

如果您有以下文件

2017-05-05 08:24:46,397 WARN [pool-80-thread.PhaseInterceptorChain... 
2017-05-05 08:24:49,444 ERROR [pool-80-thread-1] icationExceptionOutInterceptor... 
2017-05-05 08:24:49,408 WARN [pool-78-thread-1.. 
2017-05-05 08:24:52,408 ERROR [pool-78-thread-1... 
2017-05-05 08:24:52,408 ERROR [pool-78-thread-1... {... = contents inside}

我的实施将有两个条件。 1.日期字符串的长度是固定的，这是19字节的长度 2.日志级字符串也是固定的，它们是警告、调试或错误

这是我的主意

public void save2() throws IOException, NullPointerException {
        final String LOG_LVL[] = {"WARN", "DEBUG", "ERROR"};


        final class LogData
        {
            private final String dateString;
            private final String contents;
            private final int logtypelen;

            LogData(final String dateString, final String contents, final int logtypelen)
            {
                this.dateString = dateString;
                this.contents = contents;
                this.logtypelen = logtypelen;
            }

            String getDateString()
            {
                return dateString.substring(0,19);
            }

            String getContents()
            {
                return contents.substring(logtypelen,contents.length());
            }   
        }

        BufferedReader bufferedReader = null;
        List<LogData> strList = new ArrayList<LogData>();

        try {
            File file = new File(getEnvironment() + "/ischange2.log");

            if (!file.exists())
                return;

            bufferedReader = new BufferedReader(new FileReader(file));

            String line;
            while ((line = bufferedReader.readLine()) != null) {
                if (line.equals(""))
                    continue;
                int i = 0;
                int idx = -1;
                for(i = 0; i < LOG_LVL.length; i++)
                    if((idx = line.indexOf(LOG_LVL[i])) != -1) break;


                StringTokenizer st = new StringTokenizer(line, ",");

                if (st.countTokens() != 2)
                    continue;

                strList.add(new LogData(st.nextToken(), line, idx+LOG_LVL[i].length()));
            }


        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            bufferedReader.close();
        }


        for(LogData data : strList)
        {
            System.out.println("date is [" + data.getDateString() + "]===== contents is [" + data.getContents() + "]");
        }
    }

---

如何填写date10和date11？提示：您从未在方法的签名中写下“抛出Nullpointerexception”。没有意义，表明您不理解该异常的含义。无关：不要使用

StringBuffer

，而是使用

StringBuilder

。为什么要用默认字符集写入文件，然后用UTF-8读回？有没有理由试图以这种方式破坏文本？为什么要这样做？你记忆中有文本，所以就用它另外，如果

d

已经是一个

String

，那么

新字符串（d）

有什么意义呢？这是我的ischange文件：2017-05-05 08:24:46397 WARN[pool-80-thread.PhaseInterceptorChain…2017-05-05 08:24:49444 ERROR[pool-80-thread-1]异常异常执行器…2017-05-05-08:24:49408 WARN[pool-78-thread-1..2017-05-05 08:24:52408错误[pool-78-thread-1…2017-05-05 08:24:52408错误[pool-78-thread-1…{…=内部内容]。在这里，我需要读取日期之间的内容，而不仅仅是匹配的关键字。您是否有一个文件，每行都有回车符和换行符，或者一个文件中只有连续的字符块？实际上没有。只有一块数据，因为我在上面提供了一个示例。如果是这样，我有自己的想法来编码您的日志文件。请参阅我编辑的解决方案。