Java 如何获取文件中的特定字符串
在我的文件内容2017-05-05 08:24:46至2017-05-05 08:24:55中，现在我需要打印日期之间从-2017-05-05 08:24:49至-2017-05-05 08:24:52的内容。除此之外，你能推荐其他方法吗 1.文件内容：Java 如何获取文件中的特定字符串,java,Java,在我的文件内容2017-05-05 08:24:46至2017-05-05 08:24:55中，现在我需要打印日期之间从-2017-05-05 08:24:49至-2017-05-05 08:24:52的内容。除此之外，你能推荐其他方法吗 1.文件内容： [2017-05-05 08:24:46]contents is [ [pool-80 thread.PaseInterceptorChain... zhjkhzjh]nkshxkjghsjkgjskgxsjgxjsagxhujgsxhjs
[2017-05-05 08:24:46]contents is [ [pool-80
thread.PaseInterceptorChain... zhjkhzjh]nkshxkjghsjkgjskgxsjgxjsagxhujgsxhjsxghjvasxhasvxhjvsaxhvshjxvhjvhxjvhsvxhj
[2017-05-05 08:24:49]contents is [ [pool-80-thread-1] xhggajgzjh
icationExceptionOutInterceptor... nvsjhkslkxlxskl]jsahxjahx
[2017-05-05 08:24:49]contents is [ [pool-78-thread-1.. ]
[2017-05-05 08:24:52]contents is [ [pool-78-thread-1... ]
[2017-05-05 08:24:52]contents is [ [pool-78-thread-1... {... =
contents inside}]
[2017-05-05 08:24:55]contents is [ [pool-78-thread-1... {... =
contents inside}]
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();
}
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 08:24:49]contents is [ [pool-80-thread-1] xhggajgzjh
icationExceptionOutInterceptor... nvsjhkslkxlxskl]jsahxjahx
[2017-05-05 08:24:49]contents is [ [pool-78-thread-1.. ]
[2017-05-05 08:24:52]contents is [ [pool-78-thread-1... ]
[2017-05-05 08:24:49]contents is [ [pool-80-thread-1] xhggajgzjh
icationExceptionOutInterceptor... nvsjhkslkxlxskl]jsahxjahx
[2017-05-05 08:24:49]contents is [ [pool-78-thread-1.. ]
[2017-05-05 08:24:52]contents is [ [pool-78-thread-1... ]
[2017-05-05 08:24:52]contents is [ [pool-78-thread-1... {... =
contents inside}]
您可以使用String.contains（您的搜索字符串）或String.endsWith（）或String.startsWith（） 或者使用类似的逻辑
while((currentLine = scanner.readLine()) != null)
{
if(currentLine.indexOf("Your String"))
{
//Do task
passedLine = true;
}
if(passedLine)
{
//Do other task after passing the line.
}
lineNumber++;
}
您可以使用String.contains（您的搜索字符串）或String.endsWith（）或String.startsWith（） 或者使用类似的逻辑
while((currentLine = scanner.readLine()) != null)
{
if(currentLine.indexOf("Your String"))
{
//Do task
passedLine = true;
}
if(passedLine)
{
//Do other task after passing the line.
}
lineNumber++;
}
尝试添加逻辑以获取下一个datetime值，并使用它获取上一个值 例如： 目前，您将获得截至[2017-05-05 08:24:52]的日志。在指定此字符串的最后一个索引之前，请尝试标识“[2017-05-05 08:24:52]”之后的下一个立即日期时间值。 使用String.contains获取它 登录以获取最后一行：
Current datetime = "2017-05-05 08:24:52";
boolean nextValueFound;
while(!nextValueFound){
Date newDate = calender.add(Date, 1); // this will add seconds (not exactly. please check)
//convert the date to String
dateStringtobeCheckedinText = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date11);
if(text.contains(dateStringtobeCheckedinText)){
nextValueFound = true;
}
}
// your required text:
System.out.println(text.substring(text.indexOf(str1),
text.indexOf(dateStringtobeCheckedinText )));
尝试添加逻辑以获取下一个datetime值，并使用它获取上一个值 例如： 目前，您将获得截至[2017-05-05 08:24:52]的日志。在指定此字符串的最后一个索引之前，请尝试标识“[2017-05-05 08:24:52]”之后的下一个立即日期时间值。 使用String.contains获取它 登录以获取最后一行：
Current datetime = "2017-05-05 08:24:52";
boolean nextValueFound;
while(!nextValueFound){
Date newDate = calender.add(Date, 1); // this will add seconds (not exactly. please check)
//convert the date to String
dateStringtobeCheckedinText = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date11);
if(text.contains(dateStringtobeCheckedinText)){
nextValueFound = true;
}
}
// your required text:
System.out.println(text.substring(text.indexOf(str1),
text.indexOf(dateStringtobeCheckedinText )));
读取文件并将结果存储在字符串生成器中
public static String getInputString(String filepath) throws IOException {
RandomAccessFile randomAccessFile = new RandomAccessFile
(filepath, "r");
FileChannel channel = randomAccessFile.getChannel();
ByteBuffer buffer = ByteBuffer.allocate(1024); //Reading the file in chunk of 1024 bytes[1KB]
StringBuilder sb = new StringBuilder("");
while(channel.read(buffer) > 0)
{
buffer.flip(); //Ready for get ,put operation
for (int i = 0; i < buffer.limit(); i++)
{
sb.append((char)buffer.get()); //Reading every character and appending to Stringbuilder
}
buffer.clear();
}
channel.close();
randomAccessFile.close();
return sb.toString();
}
公共静态字符串getInputString（字符串文件路径）引发IOException{
RandomAccessFile RandomAccessFile=新的RandomAccessFile
（文件路径，“r”）；
FileChannel=randomAccessFile.getChannel（）；
ByteBuffer buffer=ByteBuffer.allocate（1024）；//读取1024字节块[1KB]中的文件
StringBuilder sb=新的StringBuilder（“”）；
而（通道读取（缓冲区）>0）
{
buffer.flip（）；//准备好获取、放置操作
对于（int i=0；iprivate HashMap<String, List<String>> parsedMap = new HashMap<String, List<String>>();
public HashMap<String, List<String>> getValues(String inputSTring) {
String regex = "(?=((("Start Date")(.*?|\n.*?)("End Date"))))";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(inputSTring);
while(matcher.find()) {
String key = matcher.group(3);
String value = matcher.group(4);
System.out.println(key + " => " + value);
List<String>contentsList = parsedMap.get(key);
if(contentsList == null) {
contentsList = new ArrayList<String>();
parsedMap.put(key, contentsList);
}
contentsList.add(value);
}
return parsedMap;
}
private HashMap parsedMap=new HashMap（）；
公共HashMap getValues（字符串inputSTring）{
字符串regex=“（？=（（“开始日期”）（.*？\n.*？（“结束日期”））”；
Pattern=Pattern.compile（regex）；
Matcher Matcher=pattern.Matcher（inputSTring）；
while（matcher.find（））{
字符串键=matcher.group（3）；
字符串值=matcher.group（4）；
System.out.println（键+“=>”+值）；
ListcontentsList=parsedMap.get（key）；
if（contentsList==null）{
contentsList=newarraylist（）；
parsedMap.put（key，contentsList）；
}
contentsList.add（value）；
}
返回解析的dmap；
}
然后从HashmMap获取值并创建新的输出字符串。读取文件并将结果存储在字符串生成器中
public static String getInputString(String filepath) throws IOException {
RandomAccessFile randomAccessFile = new RandomAccessFile
(filepath, "r");
FileChannel channel = randomAccessFile.getChannel();
ByteBuffer buffer = ByteBuffer.allocate(1024); //Reading the file in chunk of 1024 bytes[1KB]
StringBuilder sb = new StringBuilder("");
while(channel.read(buffer) > 0)
{
buffer.flip(); //Ready for get ,put operation
for (int i = 0; i < buffer.limit(); i++)
{
sb.append((char)buffer.get()); //Reading every character and appending to Stringbuilder
}
buffer.clear();
}
channel.close();
randomAccessFile.close();
return sb.toString();
}
公共静态字符串getInputString（字符串文件路径）引发IOException{
RandomAccessFile RandomAccessFile=新的RandomAccessFile
（文件路径，“r”）；
FileChannel=randomAccessFile.getChannel（）；
ByteBuffer buffer=ByteBuffer.allocate（1024）；//读取1024字节块[1KB]中的文件
StringBuilder sb=新的StringBuilder（“”）；
而（通道读取（缓冲区）>0）
{
buffer.flip（）；//准备好获取、放置操作
对于（int i=0；iprivate HashMap<String, List<String>> parsedMap = new HashMap<String, List<String>>();
public HashMap<String, List<String>> getValues(String inputSTring) {
String regex = "(?=((("Start Date")(.*?|\n.*?)("End Date"))))";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(inputSTring);
while(matcher.find()) {
String key = matcher.group(3);
String value = matcher.group(4);
System.out.println(key + " => " + value);
List<String>contentsList = parsedMap.get(key);
if(contentsList == null) {
contentsList = new ArrayList<String>();
parsedMap.put(key, contentsList);
}
contentsList.add(value);
}
return parsedMap;
}
private HashMap parsedMap=new HashMap（）；
公共HashMap getValues（字符串inputSTring）{
字符串regex=“（？=（（“开始日期”）（.*？\n.*？（“结束日期”））”；
Pattern=Pattern.compile（regex）；
Matcher Matcher=pattern.Matcher（inputSTring）；
while（matcher.find（））{
字符串键=matcher.group（3）；
字符串值=matcher.group（4）；
System.out.println（键+“=>”+值）；
ListcontentsList=parsedMap.get（key）；
if（contentsList==null）{
contentsList=newarraylist（）；
parsedMap.put（key，contentsList）；
}
contentsList.add（value）；
}
返回解析的dmap；
}
然后从HashmMap获取值并创建新的输出字符串。请正确格式化示例代码并使用有意义的变量名。事实上，此代码太难阅读。有两个布尔值表示如果找到第一个字符串，则第二个字符串
如果firsStringFound&&secondStringFound&&dateString不等于secondString，则请断开如果firsStringFound&&secondStringFound&&dateString不等于secondString，则断开