简单一个例子。其中正则是取消多余空格或者tab键
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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;
}
}
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java逐行读写txt文件
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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);
}
}
}
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以上这篇java实现读取txt文件并以在每行以空格取数据就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持快网idc。
原文链接：https://blog.csdn.net/shunzi1046/article/details/54928238
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