和大家分享一下如何使用java实现读取txt文件并以在每行以空格取数据,
简单一个例子。其中正则是取消多余空格或者tab键
package test4;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
public class ExplaceSql {
public static void main(String[] args) {
String filePath = ExplaceSql.class.getResource("").getPath()+"aaa.txt"; // 文件路径
read(filePath);
}
/**
* 读取内容
*/
public static String read(String filePath){
BufferedReader br = null;
String line =null;
//StringBuffer buf = new StringBuffer();
try {
//根据文件路径创建缓冲输入流
br = new BufferedReader(new FileReader(filePath));//filePath中是aaa.txt文件
String str = "";
//循环读取文件的每一行,对需要修改的行进行修改,放入缓冲对象中
while ((line = br.readLine()) != null) {
//设置正则将多余空格都转为一个空格
str=line+"\r\n";
String[] dictionary = str.split("\\s{2,}|\t");
for(int i=0;i<dictionary.length;i++){
str = "insert into tablename values("+ dictionary[0]+",'"+dictionary[1]+"',"+dictionary[2]+"')";
}
System.out.println(str);
}
} catch (Exception e) {
e.printStackTrace();
}finally {
if (br != null) {// 关闭流
try {
br.close();
} catch (IOException e) {
br = null;
}
}
}
return null;
}
}
java逐行读写txt文件
package help;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.HashMap;
import java.util.Map;
public class TXTParseUtils {
private static final Integer ONE = 1;
public static void main(String[] args) {
Map<String, Integer> map = new HashMap<String, Integer>();
/* 读取数据 */
try {
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(new File("D:/报销.txt")),
"UTF-8"));
String lineTxt = null;
while ((lineTxt = br.readLine()) != null) {
String[] names = lineTxt.split(",");
for (String name : names) {
if (map.keySet().contains(name)) {
map.put(name, (map.get(name) + ONE));
} else {
map.put(name, ONE);
}
}
}
br.close();
} catch (Exception e) {
System.err.println("read errors :" + e);
}
/* 输出数据 */
try {
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File("D:/结果.txt")),
"UTF-8"));
for (String name : map.keySet()) {
bw.write(name + " " + map.get(name));
bw.newLine();
}
bw.close();
} catch (Exception e) {
System.err.println("write errors :" + e);
}
}
}
以上就是java读取txt文件每一行并以在每行以空格取数据的详细代码。