Java读取文件常用工具类
Java读取文件常用工具类
package org.pro.file.util;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
/**
* explain: ReadFile Class
* translate: 读取文件类
* @author Muci 伤寒
* Copyright (C), ORG伤寒
* qq:1877378299
* mail:[email protected]
* tel:18616220047
*/
public class ReadFile {
private BufferedReader bufferedReader;
/**
* Read File Object
*/
public ReadFile() {
}
/**
* Read File this file path
* @param filePath
* @throws FileNotFoundException
*/
public ReadFile(String filePath) throws FileNotFoundException{
this.bufferedReader = readFile(filePath);
}
/**
* Read File
* @param file
* @throws FileNotFoundException
*/
public ReadFile(File file) throws FileNotFoundException{
this.bufferedReader = readFile(file);
}
/**
* explain: ReadFile Function
* translate: 读取文件的方法
* @param filePath 文件地址
* @return BufferedReader 缓冲读取对象
* @throws FileNotFoundException 文件找不到
*/
public BufferedReader readFile(String filePath) throws FileNotFoundException{
//Read the file path to the file reader
FileReader fileReader = new FileReader(filePath);
//File reader into the buffer
BufferedReader bufferedReader = new BufferedReader(fileReader);
this.bufferedReader = bufferedReader;
return bufferedReader;
}
/**
* explain: ReadFile Function
* translate: 读取文件的方法
* @param file 文件
* @return BufferedReader 缓冲读取对象
* @throws FileNotFoundException 文件找不到
*/
public BufferedReader readFile(File file) throws FileNotFoundException{
//Read the file path to the file reader
FileReader fileReader = new FileReader(file);
//File reader into the buffer
BufferedReader bufferedReader = new BufferedReader(fileReader);
this.bufferedReader = bufferedReader;
return bufferedReader;
}
/**
* explain: To read the file content into a string
* translate: 将文件内容读取成字符串
* @return BufferedReader 缓冲读取对象
*/
public synchronized String toString(){
//create string buffer
StringBuffer stringBuffer = new StringBuffer();
//is read file content line
String line;
try {
if(bufferedReader!=null){
//cycle read this file to line add string buffer
while((line=this.bufferedReader.readLine())!=null){
stringBuffer.append(line);
}
}
} catch (IOException e) {
e.printStackTrace();
}
return stringBuffer.toString().length()>0?stringBuffer.toString():null;
}
/**
* close buffered reader
*/
public synchronized void close(){
try {
if(bufferedReader!=null){
this.bufferedReader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
此工具类为读取普通文件类
下面则是该类的扩展类，读取ini文件，在开发语言中，ini配置文件其实是比较常用的，因为ini文件能直接被windows所识别，所以在通常很多C/S架构的软件中，都会有对应的ini文件。同时，ini文件对于C#、C++一类型的开发语言是很好识别的。
所以，在JNI开发环境下经常要读的不只是java的配置文件，还有对应的ini，xml等文件。
下列工具类对文件读取类进行扩展，用于读取ini配置文件
package org.pro.file;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import org.pro.file.util.ReadFile;
/**
* explain: Read ini file class
* translate: 读取ini文件类
* @author Muci 伤寒
* Copyright (C), ORG伤寒
* qq:1877378299
* mail:[email protected]
* tel:18616220047
*/
public class ReadIni extends ReadFile{
//buffered reader
private BufferedReader bufferedReader;
//content buffer map
private HashMap> hashMap;
/**
* Read ini Object
*/
public ReadIni() {
}
/**
* Read ini file path to content buffer map
* @param filePath
* @throws FileNotFoundException
*/
public ReadIni(String filePath) throws FileNotFoundException{
this.bufferedReader = readFile(filePath);
try {
contentToBuffer();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Read ini file to content buffer map
* @param filePath
* @throws FileNotFoundException
*/
public ReadIni(File file) throws FileNotFoundException{
this.bufferedReader = readFile(file);
try {
contentToBuffer();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* explain: ReadFile Function
* translate: 读取文件的方法
* @param filePath 文件地址
* @return BufferedReader 缓冲读取对象
* @throws FileNotFoundException 文件找不到
*/
public BufferedReader readFile(String filePath) throws FileNotFoundException{
//Read the file path to the file reader
FileReader fileReader = new FileReader(filePath);
//File reader into the buffer
BufferedReader bufferedReader = new BufferedReader(fileReader);
this.bufferedReader = bufferedReader;
try {
contentToBuffer();
} catch (IOException e) {
e.printStackTrace();
}
return bufferedReader;
}
/**
* explain: ReadFile Function
* translate: 读取文件的方法
* @param file 文件
* @return BufferedReader 缓冲读取对象
* @throws FileNotFoundException 文件找不到
*/
public BufferedReader readFile(File file) throws FileNotFoundException{
//Read the file path to the file reader
FileReader fileReader = new FileReader(file);
//File reader into the buffer
BufferedReader bufferedReader = new BufferedReader(fileReader);
this.bufferedReader = bufferedReader;
try {
contentToBuffer();
} catch (IOException e) {
e.printStackTrace();
}
return bufferedReader;
}
/**
* explain: content read to the buffer map function
* translate: 读取内容到缓冲区
* @throws IOException
*/
private void contentToBuffer() throws IOException{
//init content map buffer
hashMap = new HashMap>();
//init key and value temporary buffer
HashMap keyValue = new HashMap();
//is read file content line
String line;
//is line buffer temporary save
String lineBuffer = null;
//this area title
String title = null;
//is read file content line
while((line = bufferedReader.readLine())!=null){
line = line.trim();
//this line is title
if(line.matches("\\[.*\\]")){
//this is title not null but key value is have value
if(null!=title && !title.isEmpty()){
//content map buffer add title and key value
hashMap.put(title, keyValue);
//init key value temporary buffer
keyValue = new HashMap();
//init line buffer temporary
lineBuffer = null;
}
//get title temporary
title = line.substring(line.indexOf("[")+1,line.indexOf("]"));
}else if(line.matches(".*=.*")){
//This line is the content of the title if not the title just drop it
if(null!=title && !title.isEmpty()){
//cutting line
int i = line.indexOf("=");
lineBuffer = line;
//get the line key
String key = line.substring(0,i);
//get the line value
String value = line.substring(i+1);
//add this key value to keyValue buffer
keyValue.put(key, value);
}
}
}
//if this title is not null and this line buffer is not null just this line have value
if(null!=title && !title.isEmpty() && null!=lineBuffer && !lineBuffer.isEmpty()){
//get this line buffer the value
int i = lineBuffer.indexOf("=");
//get the line buffer key
String key = lineBuffer.substring(0,i);
//get the line buffer value
String value = lineBuffer.substring(i+1);
//add this buffer value to keyValue buffer
keyValue.put(key, value);
//add this title and keyValue buffer to content map buffer
hashMap.put(title, keyValue);
}
}
public HashMap getTitle(String title) throws IOException{
return hashMap!=null?this.hashMap.get(title):null;
}
public void close(){
if (bufferedReader!=null) {
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
相对于这扩展工具类，其实仅仅只是调用了其读文件的功能方法进行。
对于该读取ini配置文件类，ini配置文件是有多种格式的，该读取类读取的文件格式是
[区域名1]
区域对应变量名1=值
区域对应变量名2=值
区域对应变量名3=值
区域对应变量名N=值
[区域名2]
区域对应变量名1=值
区域对应变量名2=值
区域对应变量名3=值
区域对应变量名N=值
[区域名N]
区域对应变量名1=值
区域对应变量名2=值
区域对应变量名3=值
区域对应变量名N=值本文章其实算不上是文章，仅仅是对于这工具类的一个方案推广。对于文件读取，伤寒在此表示一直在进行对应研发及修改更新，以及对密文的读取等进行一系列研发。
在此也告知一些初学者，其实读写文件并不可怕，可怕的是在编码过程中如同一个无头苍蝇一般不知道从何下手。
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