RandomAccessFile 读写文件内容，去除乱码

怼烎@ 2022-06-15 03:08 457阅读 0赞

一、开发过程中遇到问题：

（1）文件内容只能等长替换，如果文件内容少了就会乱行。

解决办法：我主要是进行xml文件内容解析的，用添加随机字符串的方式进行了解决，这样既不影响文件内容解析，也把问题解决了。

二、代码：

public class FileUtils \{

/\*\*  
\* 读写文件内容  
\* @param filePath  
\*/  
public static void readWriteFile(String filePath) \{  
RandomAccessFile raf = null;  
try \{  
raf = new RandomAccessFile(filePath, "rw");  
String line = null;  
long lastPoint = 0;  
int length=0;  
while ((line = raf.readLine()) != null) \{  
String str = verifyXML(line);  
long ponit = raf.getFilePointer();  
length=line.length()-str.length();  
str=getRandomChar(length,str);  
raf.seek(lastPoint);  
raf.writeBytes(str);  
lastPoint = ponit;  
\}  
\} catch (Exception e) \{  
e.printStackTrace();  
\} finally \{  
try \{  
raf.close();  
\} catch (Exception e) \{  
e.printStackTrace();  
\}  
\}  
\}  
  
  
/\*\*  
\* 乱码字符去除  
\* @param in  
\* @return  
\*/  
public static String verifyXML(String in) \{  
StringBuffer out = new StringBuffer();  
char current;  
  
  
if (in == null || ("".equals(in)))  
return "";  
for (int i = 0; i < in.length(); i++) \{  
current = in.charAt(i);  
if ((current==0x9)||(current==0xA)||(current==0xD)  
||((current>=0x20)&&(current<=0xD7FF))  
||((current>=0xE000)&&(current<=0xFFFD))  
||((current>=0x10000)&&(current<=0x10FFFF)))\{  
out.append(current);  
\}  
\}  
return out.toString();  
\}  
  
  
/\*\*  
\* 生成指定长度随机字符串  
\* @param length  
\* @param str  
\* @return  
\*/  
public static String getRandomChar(int length,String str) \{    
char\[\] chr = \{ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',     
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',     
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' \};    
Random random = new Random();    
StringBuffer sb = new StringBuffer(str);    
for (int i = 0; i < length; i++) \{    
sb.append(chr\[random.nextInt(62)\]);    
\}    
return sb.toString();    
\}  
  
  
public static void main(String\[\] args) \{  
String filePath="D://test.xml";  
readWriteFile(filePath);  
\}  
  
  
\}