mybatis 的 DefaultVFS 日志乱码问题
mybatis 的 DefaultVFS 日志乱码问题
1. 问题描述
今天在启动同事搭建的工程时，发现 console 中乱码，细看下，是 mybatis 的 DefaultVFS 打印的日志乱码。
2. 寻找问题
看到问题，不解决痒的不行。
于是，打开 mybatis 的源码，找到打印乱码日志的代码，如下：
乱码日志打印
从上图我们可以看出来，从字节流转化为字符流时，没有指定字符编码，而我们的控制台打印编码设置的为 UTF-8
3. 解决问题
找到问题后，我们重写此方法即可，详细代码如下：
package com.feshfans;
import org.apache.ibatis.io.DefaultVFS;
import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;
import java.io.*;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
public class FeshfansVFS extends DefaultVFS {
private static final Log log = LogFactory.getLog(DefaultVFS.class);
@Override
public List<String> list(URL url, String path) throws IOException {
InputStream is = null;
try {
List<String> resources = new ArrayList<String>();
// First, try to find the URL of a JAR file containing the requested resource. If a JAR
// file is found, then we'll list child resources by reading the JAR.
URL jarUrl = findJarForResource(url);
if (jarUrl != null) {
is = jarUrl.openStream();
if (log.isDebugEnabled()) {
log.debug("Listing " + url);
}
resources = listResources(new JarInputStream(is), path);
}
else {
List<String> children = new ArrayList<String>();
try {
if (isJar(url)) {
// Some versions of JBoss VFS might give a JAR stream even if the resource
// referenced by the URL isn't actually a JAR
is = url.openStream();
JarInputStream jarInput = new JarInputStream(is);
if (log.isDebugEnabled()) {
log.debug("Listing " + url);
}
for (JarEntry entry; (entry = jarInput.getNextJarEntry()) != null;) {
if (log.isDebugEnabled()) {
log.debug("Jar entry: " + entry.getName());
}
children.add(entry.getName());
}
jarInput.close();
}
else {
/*
* Some servlet containers allow reading from directory resources like a
* text file, listing the child resources one per line. However, there is no
* way to differentiate between directory and file resources just by reading
* them. To work around that, as each line is read, try to look it up via
* the class loader as a child of the current resource. If any line fails
* then we assume the current resource is not a directory.
*/
is = url.openStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"UTF-8"));
List<String> lines = new ArrayList<String>();
for (String line; (line = reader.readLine()) != null;) {
if (log.isDebugEnabled()) {
log.debug("Reader entry: " + line);
}
lines.add(line);
if (getResources(path + "/" + line).isEmpty()) {
lines.clear();
break;
}
}
if (!lines.isEmpty()) {
if (log.isDebugEnabled()) {
log.debug("Listing " + url);
}
children.addAll(lines);
}
}
} catch (FileNotFoundException e) {
/*
* For file URLs the openStream() call might fail, depending on the servlet
* container, because directories can't be opened for reading. If that happens,
* then list the directory directly instead.
*/
if ("file".equals(url.getProtocol())) {
File file = new File(url.getFile());
if (log.isDebugEnabled()) {
log.debug("Listing directory " + file.getAbsolutePath());
}
if (file.isDirectory()) {
if (log.isDebugEnabled()) {
log.debug("Listing " + url);
}
children = Arrays.asList(file.list());
}
}
else {
// No idea where the exception came from so rethrow it
throw e;
}
}
// The URL prefix to use when recursively listing child resources
String prefix = url.toExternalForm();
if (!prefix.endsWith("/")) {
prefix = prefix + "/";
}
// Iterate over immediate children, adding files and recursing into directories
for (String child : children) {
String resourcePath = path + "/" + child;
resources.add(resourcePath);
URL childUrl = new URL(prefix + child);
resources.addAll(list(childUrl, resourcePath));
}
}
return resources;
} finally {
if (is != null) {
try {
is.close();
} catch (Exception e) {
// Ignore
}
}
}
}
}
然后，通过以下方法设置自定义类即可：
VFS.addImplClass(FeshfansVFS.class);
