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Solution to Java reading garbled Linux file names

藏色散人

Release： 2020-04-07 10:33:17

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Solution to Java reading garbled Linux file names

Solution to Java reading garbled file names of Linux system files

1, Problem description

Web applications want to use Java Reading Linux system files and displaying them on the web page results in garbled Chinese file names?

Problem scenario description: When the user accesses the tomcat server through the browser and requests to view the file list information under a certain path, the tomcat web application calls the getFilesByPath(String path) method to read the file list information and respond to the request. The page is in Chinese The file name is garbled.

Recommended tutorial: "java learning"

The code is as follows:

File class

import java.io.Serializable;
import java.util.Date;
public class FileInfo implements Serializable{
/**
* 
*/
private static final long serialVersionUID = 1L;
String name;
long size;
Date lastModified;
boolean dir;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public long getSize() {
return size;
}
public void setSize(long size) {
this.size = size;
}
public Date getLastModified() {
return lastModified;
}
public void setLastModified(Date lastModified) {
this.lastModified = lastModified;
}
public boolean isDir() {
return dir;
}
public void setDir(boolean dir) {
this.dir = dir;
}
}

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The java code is as follows:

/**
* 根据path路径查找出该路径下可视文件列表
* @param path
* @return
*/
public List getFilesByPath(String path){
List fileList = new ArrayList();
File file = new File(path);
/**
* 查找可视文件列表
*/
File[] files = file.listFiles(new FileFilter() {
@Override
public boolean accept(File f) {
return !f.isHidden();//过滤隐藏文件
}
});
/**
* java文件类型转换为web显示文件类
*/
for (File f : files) {
FileInfo fileInfo = new FileInfo();
fileInfo.setName(f.getName());
fileInfo.setSize(f.length());
fileInfo.setLastModified(new Date(f.lastModified()));
                     fileInfo.setDir(f.isDirectory());
}
return fileList;
}

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When the read file information is displayed on the web page, the Chinese file name appears garbled.

2, Solution

After the web system calls this method to read the file list, the files or folders named in Chinese are displayed as garbled characters. Garbled characters are often caused by inconsistent data stream encoding. To check the data stream encoding, first check that the tomcat server and page display encoding are both utf-8 encoding. Check that the linux system encoding is iso-8859-15. Of course, we also know that java defaults to Unicode encoding is used, but this default Unicode encoding is not the utf-8 encoding we want, so we need to transcode it ourselves.

Solution 1:

Change the Linux system encoding to utf-8. This solution is relatively simple, but it requires the user to have system root permissions before it can be modified.

Solution 2:

Convert the system encoding to utf-8 encoding through java program transcoding.

/**
* 根据path路径查找出该路径下可视文件列表
* @param path
* @return
*/
public List getFilesByPath(String path){
//获取系统编码
String encoding = System.getProperty("file.encoding");
List fileList = new ArrayList();
File file = new File(path);
/**
* 查找可视文件
*/
File[] files = file.listFiles(new FileFilter() {
@Override
public boolean accept(File f) {
return !f.isHidden();
}
});
/**
* java文件类型转换为web显示文件类型
*/
for (File f : files) {
FileInfo fileInfo = new FileInfo();
try {
//将系统编码encoding转换为utf-8编码
fileInfo.setName(new String(f.getName().getBytes(encoding),"UTF-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
fileInfo.setSize(f.length());
fileInfo.setLastModified(new Date(f.lastModified()));
                       fileInfo.setDir(f.isDirectory());
}
return fileList;
}

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The page shows that the file name is normal, but the Chinese characters of the path parameter appear garbled when traversing the file, causing the path to not exist.

The solution is to convert the path parameter from utf-8 to system encoding, and then traverse the file according to the path.

/**
* 根据path路径查找出该路径下可视文件列表
* @param path
* @return
*/
public List getFilesByPath(String path) throws Exception{
//获取系统编码
String encoding = System.getProperty("file.encoding");
List fileList = new ArrayList();
try {
//将path路径转码为系统编码
File file = new File(new String(path.getBytes("UTF-8"),encoding));
//判断文件路径是否存在，是否有读权限，如不存在或者没有权限则抛出异常
if(file.exists() && file.isDirectory() && file.canRead()){
/**
* 查找可视文件
*/
File[] files = file.listFiles(new FileFilter() {
@Override
public boolean accept(File f) {
return !f.isHidden();
}
});
/**
* java文件类型转换为web显示文件类型
*/
for (File f : files) {
FileInfo fileInfo = new FileInfo();
//将系统编码encoding转换为utf-8编码
fileInfo.setName(new String(f.getName().getBytes(encoding),"UTF-8"));
fileInfo.setSize(f.length());
fileInfo.setLastModified(new Date(f.lastModified()));
fileInfo.setDir(f.isDirectory());
}
}else{
throw new Exception("Paht:"+path+", exists:"+file.exists()+", canRead:"+file.isDirectory());
}
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
return fileList;
}

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This can solve the problem of Java reading garbled file names in Linux systems. . .

Solving the problem of garbled characters is to trace the display from the source. It is that simple to struggle with encoding all the way. . .

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