- 版本说明
- 为什么不支持中文
- PropertySourceLoader接口
- PropertiesPropertySourceLoader类
- OriginTrackedPropertiesLoader类
- 重写读取application.properties文件的逻辑
- 1.创建OriginTrackedPropertiesLoader文件
- 2.创建PropertiesPropertySourceLoader文件
- 3.创建spring.factories文件
- 测试
- 最后
本文不完全基于springboot-2.4.5，各版本需要重写类的逻辑各有不同，本文的代码只可模仿，不可复制
为什么不支持中文 PropertySourceLoader接口先看读取配置文件的接口 org.springframework.boot.env.PropertySourceLoader
Strategy interface located via {@link SpringFactoriesLoader} and used to load a {@link PropertySource}.
意思是说通过meta-INF/spring.factories配置文件加载
接口 org.springframework.boot.env.PropertySourceLoader下有两个默认实现
org.springframework.boot.env.YamlPropertySourceLoader负责读取yml文件，
org.springframework.boot.env.PropertiesPropertySourceLoader负责读取properties和xml文件
可以看出org.springframework.boot.env.OriginTrackedPropertiesLoader.CharacterReader类
以ISO_8859_1编码方式读取properties文件
使SpringBoot配置文件application.properties支持中文
1.创建OriginTrackedPropertiesLoader文件复制org.springframework.boot.env.OriginTrackedPropertiesLoader文件内容，并修改ISO_8859_1编码为UTF_8编码
package com.xxx.config;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.linkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.function.BooleanSupplier;
import org.springframework.boot.origin.Origin;
import org.springframework.boot.origin.OriginTrackedValue;
import org.springframework.boot.origin.TextResourceOrigin;
import org.springframework.boot.origin.TextResourceOrigin.Location;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;
public class MyOriginTrackedPropertiesLoader {
private final Resource resource;
MyOriginTrackedPropertiesLoader(Resource resource) {
Assert.notNull(resource, "Resource must not be null");
this.resource = resource;
}
List load() throws IOException {
return load(true);
}
List load(boolean expandLists) throws IOException {
List documents = new ArrayList<>();
document document = new document();
StringBuilder buffer = new StringBuilder();
try (CharacterReader reader = new CharacterReader(this.resource)) {
while (reader.read()) {
if (reader.isPoundCharacter()) {
if (isNewdocument(reader)) {
if (!document.isEmpty()) {
documents.add(document);
}
document = new document();
}
else {
if (document.isEmpty() && !documents.isEmpty()) {
document = documents.remove(documents.size() - 1);
}
reader.setLastLineComment(true);
reader.skipComment();
}
}
else {
reader.setLastLineComment(false);
loadKeyAndValue(expandLists, document, reader, buffer);
}
}
}
if (!document.isEmpty() && !documents.contains(document)) {
documents.add(document);
}
return documents;
}
private void loadKeyAndValue(boolean expandLists, document document, CharacterReader reader, StringBuilder buffer)
throws IOException {
String key = loadKey(buffer, reader).trim();
if (expandLists && key.endsWith("[]")) {
key = key.substring(0, key.length() - 2);
int index = 0;
do {
OriginTrackedValue value = loadValue(buffer, reader, true);
document.put(key + "[" + (index++) + "]", value);
if (!reader.isEndOfLine()) {
reader.read();
}
}
while (!reader.isEndOfLine());
}
else {
OriginTrackedValue value = loadValue(buffer, reader, false);
document.put(key, value);
}
}
private String loadKey(StringBuilder buffer, CharacterReader reader) throws IOException {
buffer.setLength(0);
boolean previousWhitespace = false;
while (!reader.isEndOfLine()) {
if (reader.isPropertyDelimiter()) {
reader.read();
return buffer.toString();
}
if (!reader.isWhiteSpace() && previousWhitespace) {
return buffer.toString();
}
previousWhitespace = reader.isWhiteSpace();
buffer.append(reader.getCharacter());
reader.read();
}
return buffer.toString();
}
private OriginTrackedValue loadValue(StringBuilder buffer, CharacterReader reader, boolean splitLists)
throws IOException {
buffer.setLength(0);
while (reader.isWhiteSpace() && !reader.isEndOfLine()) {
reader.read();
}
Location location = reader.getLocation();
while (!reader.isEndOfLine() && !(splitLists && reader.isListDelimiter())) {
buffer.append(reader.getCharacter());
reader.read();
}
Origin origin = new TextResourceOrigin(this.resource, location);
return OriginTrackedValue.of(buffer.toString(), origin);
}
private boolean isNewdocument(CharacterReader reader) throws IOException {
if (reader.isLastLineComment()) {
return false;
}
boolean result = reader.getLocation().getColumn() == 0 && reader.isPoundCharacter();
result = result && readAndExpect(reader, reader::isHyphenCharacter);
result = result && readAndExpect(reader, reader::isHyphenCharacter);
result = result && readAndExpect(reader, reader::isHyphenCharacter);
if (!reader.isEndOfLine()) {
reader.read();
reader.skipWhitespace();
}
return result && reader.isEndOfLine();
}
private boolean readAndExpect(CharacterReader reader, BooleanSupplier check) throws IOException {
reader.read();
return check.getAsBoolean();
}
private static class CharacterReader implements Closeable {
private static final String[] ESCAPES = { "trnf", "trnf" };
private final LineNumberReader reader;
private int columnNumber = -1;
private boolean escaped;
private int character;
private boolean lastLineComment;
CharacterReader(Resource resource) throws IOException {
this.reader = new LineNumberReader(
new InputStreamReader(resource.getInputStream(), StandardCharsets.UTF_8));
}
@Override
public void close() throws IOException {
this.reader.close();
}
boolean read() throws IOException {
return read(false);
}
boolean read(boolean wrappedLine) throws IOException {
this.escaped = false;
this.character = this.reader.read();
this.columnNumber++;
if (this.columnNumber == 0) {
skipWhitespace();
if (!wrappedLine) {
if (this.character == '!') {
skipComment();
}
}
}
if (this.character == '\') {
this.escaped = true;
readEscaped();
}
else if (this.character == 'n') {
this.columnNumber = -1;
}
return !isEndOfFile();
}
private void skipWhitespace() throws IOException {
while (isWhiteSpace()) {
this.character = this.reader.read();
this.columnNumber++;
}
}
private void setLastLineComment(boolean lastLineComment) {
this.lastLineComment = lastLineComment;
}
private boolean isLastLineComment() {
return this.lastLineComment;
}
private void skipComment() throws IOException {
while (this.character != 'n' && this.character != -1) {
this.character = this.reader.read();
}
this.columnNumber = -1;
}
private void readEscaped() throws IOException {
this.character = this.reader.read();
int escapeIndex = ESCAPES[0].indexOf(this.character);
if (escapeIndex != -1) {
this.character = ESCAPES[1].charAt(escapeIndex);
}
else if (this.character == 'n') {
this.columnNumber = -1;
read(true);
}
else if (this.character == 'u') {
readUnicode();
}
}
private void readUnicode() throws IOException {
this.character = 0;
for (int i = 0; i < 4; i++) {
int digit = this.reader.read();
if (digit >= '0' && digit <= '9') {
this.character = (this.character << 4) + digit - '0';
}
else if (digit >= 'a' && digit <= 'f') {
this.character = (this.character << 4) + digit - 'a' + 10;
}
else if (digit >= 'A' && digit <= 'F') {
this.character = (this.character << 4) + digit - 'A' + 10;
}
else {
throw new IllegalStateException("Malformed \uxxxx encoding.");
}
}
}
boolean isWhiteSpace() {
return !this.escaped && (this.character == ' ' || this.character == 't' || this.character == 'f');
}
boolean isEndOfFile() {
return this.character == -1;
}
boolean isEndOfLine() {
return this.character == -1 || (!this.escaped && this.character == 'n');
}
boolean isListDelimiter() {
return !this.escaped && this.character == ',';
}
boolean isPropertyDelimiter() {
return !this.escaped && (this.character == '=' || this.character == ':');
}
char getCharacter() {
return (char) this.character;
}
Location getLocation() {
return new Location(this.reader.getLineNumber(), this.columnNumber);
}
boolean isPoundCharacter() {
return this.character == '#';
}
boolean isHyphenCharacter() {
return this.character == '-';
}
}
static class document {
private final Map values = new linkedHashMap<>();
void put(String key, OriginTrackedValue value) {
if (!key.isEmpty()) {
this.values.put(key, value);
}
}
boolean isEmpty() {
return this.values.isEmpty();
}
Map asMap() {
return this.values;
}
}
}
2.创建PropertiesPropertySourceLoader文件
复制org.springframework.boot.env.PropertiesPropertySourceLoader文件内容，并将调用org.springframework.boot.env.OriginTrackedPropertiesLoader类改为调用com.xxx.config.MyOriginTrackedPropertiesLoader类
package com.xxx.config;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.springframework.boot.env.OriginTrackedMapPropertySource;
import org.springframework.boot.env.PropertySourceLoader;
import org.springframework.core.env.PropertySource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PropertiesLoaderUtils;
import com.xxx.config.MyOriginTrackedPropertiesLoader.document;
public class MyPropertiesPropertySourceLoader implements PropertySourceLoader {
private static final String XML_FILE_EXTENSION = ".xml";
@Override
public String[] getFileExtensions() {
return new String[] { "properties", "xml" };
}
@Override
public List> load(String name, Resource resource) throws IOException {
List> properties = loadProperties(resource);
if (properties.isEmpty()) {
return Collections.emptyList();
}
List> propertySources = new ArrayList<>(properties.size());
for (int i = 0; i < properties.size(); i++) {
String documentNumber = (properties.size() != 1) ? " (document #" + i + ")" : "";
propertySources.add(new OriginTrackedMapPropertySource(name + documentNumber,
Collections.unmodifiableMap(properties.get(i)), true));
}
return propertySources;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private List> loadProperties(Resource resource) throws IOException {
String filename = resource.getFilename();
List> result = new ArrayList<>();
if (filename != null && filename.endsWith(XML_FILE_EXTENSION)) {
result.add((Map) PropertiesLoaderUtils.loadProperties(resource));
}
else {
List documents = new MyOriginTrackedPropertiesLoader(resource).load();
documents.forEach((document) -> result.add(document.asMap()));
}
return result;
}
}
3.创建spring.factories文件
在resources资源目录下创建/meta-INF/spring.factories文件
文件内容为
org.springframework.boot.env.PropertySourceLoader= com.xxx.config.MyPropertiesPropertySourceLoader测试
- 创建application.properties文件
abc=中文测试
- 创建service类，使用@Value注入abc变量
@Value("${abc}")
private String abc;
- 分别在com.xxx.config.MyPropertiesPropertySourceLoader类、org.springframework.boot.env.PropertiesPropertySourceLoader类、org.springframework.boot.env.YamlPropertySourceLoader类的load方法打断点
- 以debug方式运行项目，可以看到只加载了com.xxx.config.MyPropertiesPropertySourceLoader类和org.springframework.boot.env.YamlPropertySourceLoader类，
- 发请求查看abc变量的值为：中文测试，已经不乱码了
配置中心properties文件的中文属性也没有了乱码
