java中如何实现删除文本文档里面的指定字符 java如何根据指定字符串删除文本文件中的相应一行
JAVA\u5982\u4f55\u5220\u9664\u6587\u672c\u6587\u6863\u91cc\u7684\u67d0\u4e00\u884c\u4f60\u53ef\u4ee5\u7528StreamReader\u4e00\u884c\u4e00\u884c\u5730\u8bfb\uff0c\u76f4\u5230\u8bfb\u5b8c\uff0c\u4f60\u628a\u8bfb\u5230\u7684\u6bcf\u4e00\u884c\u52a0\u5230ArrayList\u5bf9\u8c61\u4e2d\u5b58\u653e\uff0c\u7136\u540e\u904d\u5386\u8fd9\u4e2aArrayList\u5bf9\u8c61\uff0c\u5bf9\u6bcf\u4e00\u884c\u8fdb\u884c\u5224\u65ad\u5904\u7406\uff0c\u4e0d\u8981\u7684\u76f4\u63a5\u5220\u9664\uff0c\u7136\u540e\u518d\u7528StreamWriter\u628aArrayList\u5bf9\u8c61\u4e2d\u7684\u6570\u636e\u91cd\u5199\u5230\u6587\u4ef6\u4e2d\uff0c\u539f\u6765\u7684\u6587\u4ef6\u8986\u76d6\u6389\u3002
\u53ef\u4ee5\u901a\u8fc7BufferedReader \u6d41\u7684\u5f62\u5f0f\u8fdb\u884c\u6d41\u8bfb\u53d6\uff0c\u4e4b\u540e\u901a\u8fc7readLine\u65b9\u6cd5\u83b7\u53d6\u5230\u7684\u5185\u5bb9,\u4e4b\u540e\u901a\u8fc7if\u5224\u65ad\u51fa\u7b26\u5408\u6761\u4ef6\u7684\u91cd\u5199\u5982\u65b0\u6587\u4ef6\uff0c\u4e0d\u7b26\u5408\u7684\u76f4\u63a5\u820d\u5f03\u5373\u53ef\u3002
\u4e3e\u4f8b\uff1a
BufferedReader bre = null;
OutputStreamWriter pw = null;//\u5b9a\u4e49\u4e00\u4e2a\u6d41
try {
String file = "D:/test/test.txt";
bre = new BufferedReader(new FileReader(file));//\u6b64\u65f6\u83b7\u53d6\u5230\u7684bre\u5c31\u662f\u6574\u4e2a\u6587\u4ef6\u7684\u7f13\u5b58\u6d41
pw = new OutputStreamWriter(new FileOutputStream(\u201cD:/test.txt\u201d),"GBK");//\u786e\u8ba4\u6d41\u7684\u8f93\u51fa\u6587\u4ef6\u548c\u7f16\u7801\u683c\u5f0f\uff0c\u6b64\u8fc7\u7a0b\u521b\u5efa\u4e86\u201ctest.txt\u201d\u5b9e\u4f8b
while ((str = bre.readLine())!= null) // \u5224\u65ad\u6700\u540e\u4e00\u884c\u4e0d\u5b58\u5728\uff0c\u4e3a\u7a7a\u7ed3\u675f\u5faa\u73af
{
if(str.indexOf("\u6392\u9664")<0){//\u5224\u65ad\u662f\u5426\u9700\u8981\u820d\u5f03
pw.write(str);//\u5c06\u8981\u5199\u5165\u6587\u4ef6\u7684\u5185\u5bb9\uff0c\u53ef\u4ee5\u591a\u6b21write
}
}
bre.close();//\u5173\u95ed\u6d41
pw.close();//\u5173\u95ed\u6d41
\u5907\u6ce8\uff1a\u6587\u4ef6\u6d41\u7528\u5b8c\u4e4b\u540e\u5fc5\u987b\u53ca\u65f6\u901a\u8fc7close\u65b9\u6cd5\u5173\u95ed\uff0c\u5426\u5219\u4f1a\u4e00\u76f4\u5904\u4e8e\u6253\u5f00\u72b6\u6001\uff0c\u76f4\u81f3\u7a0b\u5e8f\u505c\u6b62\uff0c\u589e\u52a0\u7cfb\u7edf\u8d1f\u62c5\u3002
更为详细的介绍，可以参考：
以及：
给分:
亲，要读入的文件自己建哦
源代码：
import java.io.InputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.Scanner;
import java.io.FileNotFoundException;
import java.io.IOException;
public class zifutihuan
{
protected static void rep(String ch)
{
BufferedReader bis = null;
FileWriter bos = null;
String s = null;
try
{
bis = new BufferedReader(new FileReader("1.txt"));
bos = new FileWriter("2.txt");
while(null != (s = bis.readLine()))
{
s = s.replaceAll(ch,"");
System.out.println(s);
s= s+"\r\n";
bos.write(s);
}
bos.close();
bis.close();
s = null;
}
catch(FileNotFoundException e)
{
System.out.println("未找到文件\n");
}
catch(IOException ee)
{
System.out.println("aaa");
}
}
public static void main(String args[])
{
rep("123");
}
}
思路：用IO流读文件，将内容读为字符串，进行替换，在把新内容写回去，关闭IO流
用IO流 先把内容读出来 比如读出来后 全转为String 类型吧
用String的replace（a，b）方法可把a替换为b
将指定的字符用replace替换成空字符
如replace("ddddddd","")
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