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java读写代码 java文件读写代码

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Java如何读写txt文件的代码有关Java如何读写txt文件这个问题经常在面试时会被问到java读写代码，不懂或不熟悉的同志们可是要记好java读写代码了哟!先来看下具体实现吧! package common; import java.io.*; import java.util.ArrayList; public class IOTest { public static void main (String args[]) { ReadDate(); WriteDate(); } /** * 读取数据 */ public static void ReadDate() { String url = “e:/2.txt”; try { FileReader read = new FileReader(new File(url)); StringBuffer sb = new StringBuffer(); char ch[] = new char[1024]; int d = read.read(ch); while(d!=-1){ String str = new String(ch,0,d); sb.append(str); d = read.read(ch); } System.out.print(sb.toString()); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * 写入数据 */ public static void WriteDate() { try{ File file = new File(“D:/abc.txt”); if (file.exists()) { file.delete(); } file.createNewFile(); BufferedWriter output = new BufferedWriter(new FileWriter(file)); ArrayList ResolveList = new ArrayList(); for (int i = 0; i10; i++) { ResolveList.add(Math.random()* 100); } for (int i=0 ;i output.write(String.valueOf(ResolveList.get(i)) + “\n”); } output.close(); } catch (Exception ex) { System.out.println(ex); } } }
跪求Java中写入文件和从文件中读取数据的最佳的代码!import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class IOTest {
public static void main(String[] args) {
String str = "123\r\n456";
writeFile(str);//写
String str1 = readFile();//读
System.out.println(str1);
}
/**
* 传递写的内容
* @param str
*/
static void writeFile(String str) {
try {
File file = new File("d:\\file.txt");
if(file.exists()){//存在
file.delete();//删除再建
file.createNewFile();
}else{
file.createNewFile();//不存在直接创建
}
FileWriter fw = new FileWriter(file);//文件写IO
fw.write(str);
fw.flush();
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 返回读取的内容
* @return
*/
static String readFile() {
String str = "", temp = null;
try {
File file = new File("d:\\file.txt");
FileReader fr = new FileReader(file);
BufferedReader br = new BufferedReader(fr);//文件读IO
while((temp = br.readLine())!=null){//读到结束为止
str += (temp+"\n");
}
br.close();
fr.close();
} catch (IOException e) {
e.printStackTrace();
}
return str;
}
}
刚写的，够朋友好好学习一下啦，呵呵
多多看API，多多练习
求用java读写properties文件的代码Java代码
package com.LY;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.Properties;
public class TestMain {
// 根据key读取value
public static String readValue(String filePath, String key) {
Properties props = new Properties();
try {
InputStream in = new BufferedInputStream(new FileInputStream(
filePath));
props.load(in);
String value = https://www.04ip.com/post/props.getProperty(key);
System.out.println(key + value);
return value;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
// 读取propertiesjava读写代码的全部信息
public static void readProperties(String filePath) {
Properties props = new Properties();
try {
InputStream in = new BufferedInputStream(new FileInputStream(

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