【发布时间】：2014-07-22 21:18:18
【问题描述】：
我一直在尝试用 java 创建一个简单的程序，将一些单词替换到文件中。要将文本更改为我创建的文件，我创建了一个字符串并将其设置为文件文本：
Path path = Paths.get("somePath/someFile.someExtension");
Charset charset = StandardCharsets.UTF_8;
String s = new String(Files.readAllBytes(path), charset);
编辑：要使用s 保存到文件，我使用了Files.write(path, s.getBytes(charset));。
然后我用s.replaceAll("A", "B") 之类的命令更改字符串。但现在，我被困住了。我想做一个更复杂的，然后用“B”替换“A”。我会尽力解释：
我需要在文件中查找wall someNumber someNumer someNumber是否在其中，并且如果有三个参数（someNumber someNumber someNumber），则在中心获取“someNumber”的值。例如：
如果命令是：
wall 200 500 100
wall 200 500 100
然后我想从中心获取参数（在第一种情况下为 500，在第二种情况下为 500），并将其存储到变量中，然后将其从字符串中删除。之后，在这些命令的顶部（在示例中为wall 200 500 100 wall 200 500 100），我想写：
usemtl texture
ceil (someNumber that we stored, in the case, 500)
请注意，如果参数wall wall 没有任何分隔符（例如#other wall），则中间的 someNumber 将相等（500 和 500 相等）。因此，下面的命令将仅按组显示（例如，如果 wall wall wall... 没有与 #other wall 分隔）。
其他示例，这将是之前/之后的文件：
之前：
wall 100 300 50
wall 100 300 100
wall 100 300 400
之后：
usemtl texture
ceil 300
wall 100 50
wall 100 100
wall 100 400
那么，我该如何做这个替换呢？
请回答！我不知道怎么做！
编辑：向@Roan 提问，大部分代码的所有者：
现在，@Roan 的答案代码转换为：
package com.fileConverter.main;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import javax.swing.JFileChooser;
public class FileReplace extends JFileChooser {
private static final long serialVersionUID = -254322941935132675L;
private static FileReplace chooser = new FileReplace();
public static void main(String[] args) {
chooser.showDialog(chooser, "Open");
}
public void cancelSelection() {
System.exit(0);
}
public void approveSelection() {
super.approveSelection();
System.out.println("starting...");
// The path were your file is
String path = chooser.getSelectedFile().getAbsolutePath();
File file = new File(path);
// try to create an inputstream from the file
FileInputStream fis = null;
try {
fis = new FileInputStream(file);
} catch (FileNotFoundException e) {
// If we are here the file is not found
e.printStackTrace();
}
// make it a buffered reader
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(fis));
// to store the current line
String line;
// array to store the different words
String[] words;
// create a second temporally file that will replace the original file
File file2 = new File(chooser.getSelectedFile().getParentFile()
+ "$$$$$$$$$$$$$$$.tmp");
try {
file.createNewFile();
} catch (IOException e1) {
e1.printStackTrace();
}
// and create the streams
FileOutputStream file2Os = null;
try {
file2Os = new FileOutputStream(file2);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
PrintWriter writer = new PrintWriter(file2Os);
try {
System.out.println("replacing code...");
writer.println("mtllib textures.mtl");
// loop through all lines and
while ((line = bufferedReader.readLine()) != null) {
line = line
.replace("//", "#")
.replace("(", "wall")
.replace(")", "\n")
.replace("{", "")
.replace("}", "")
.replace("# brush from cube",
"room cube" + countWords(line, "cube"))
.replace(" NULL 0 0 0 1 1 0 0 0", "")
.replace("\"classname\"", "")
.replace("\"worldspawn\"", "");
// get all the diffent terms
words = line.split(" ");
// see if there are 4 terms in there: wall x x x
// and if the first term equals wall28
// and if the middle number is the number you want to delete
// if not just copy the line over
if (words.length == 4 && words[0].contains("wall")) {
double doubleVal = Double.parseDouble(words[2]);
int val = (int) doubleVal;
// now modify the line by removing the middel number
String newLine = words[0] + " " + words[1] + " " + words[3];
String valInsert = null;
if (val >= 0)
valInsert = "\n" + "usemtl texture" + "\n" + "ceil "
+ val;
else if (val < 0)
valInsert = "\n" + "usemtl texture" + "\n" + "floor "
+ val;
// write this to the new file
writer.println(valInsert);
writer.println(newLine);
} else {
// copy the old line
writer.println(line);
}
}
} catch (IOException e) {
e.printStackTrace();
}
// close our resources
writer.close();
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
// now we rename the temp file and replace the old file
// with the new file with the new content
file.delete();
file2.renameTo(file);
System.out.println("done!");
}
public int countWords(String string, String word) {
int lastIndex = 0;
int count = 0;
while (lastIndex != -1) {
lastIndex = string.indexOf(word, lastIndex);
if (lastIndex != -1) {
count++;
lastIndex += word.length();
}
}
return count;
}
}
问题是这部分没有做任何替换：
if (words.length == 4 && words[0].contains("wall")) {
double doubleVal = Double.parseDouble(words[2]);
int val = (int) doubleVal;
// now modify the line by removing the middel number
String newLine = words[0] + " " + words[1] + " " + words[3];
String valInsert = null;
if (val >= 0)
valInsert = "\n" + "usemtl texture" + "\n" + "ceil "
+ val;
else if (val < 0)
valInsert = "\n" + "usemtl texture" + "\n" + "floor "
+ val;
// write this to the new file
writer.println(valInsert);
writer.println(newLine);
}
我该如何解决？另一件事，这部分是假设创建一个在检查多维数据集写入次数后增长的数字，但它也不起作用:(
.replace("# brush from cube", "room cube" + countWords(line, "cube"))
countWords 方法：
public int countWords(String string, String word) {
int lastIndex = 0;
int count = 0;
while (lastIndex != -1) {
lastIndex = string.indexOf(word, lastIndex);
if (lastIndex != -1) {
count++;
lastIndex += word.length();
}
}
return count;
}
非常感谢
【问题讨论】：
-
请澄清您的问题。你想写：PS....
-
是的，我知道它看起来很复杂。我修复了PS，现在尝试再次阅读。有不明白的可以评论，我会一一解答。