java项目引入resources下面的文件
好久没写java,差点都忘了。。。
起因是一个资源文件在resources目录下面,转换后的地址类型是string类型不是file,于是用类加载器获取文件资源路径
String dbPath = GetIpAddr.class.getClassLoader().getResource("ip2region/ip2region.xdb").getPath();
但是这样在编译部署完毕后会报错
Generating unique operation named: userInfoUsingGET_1
2024-09-26 17:15:40.345 INFO 3992 --- [nio-8081-exec-1] o.a.c.c.C.[.[localhost].[/sys_api] : Initializing Spring DispatcherServlet 'dispatcherServlet'
failed to load vector index from file:/C:/Users/Administrator/Desktop/jar/api.jar!/BOOT-INF/classes!/ip2region/ip2region.xdb: java.io.FileNotFoundException: file:\C:\Users\Administrator\Desktop\jar\api.jar!\BOOT-INF\classes!\ip2region\ip2region.xdb (文件名、目录名或卷标语法不正确。)
2024-09-26 17:15:40.664 ERROR 3992 --- [nio-8081-exec-1] i.d.exception.RenExceptionHandler :
### Error updating database. Cause: com.mysql.cj.jdbc.exceptions.MysqlDataTruncation: Data truncation: Data too long for column 'ip_addr' at row 1
### The error may exist in URL [jar:file:/C:/Users/Administrator/Desktop/jar/api.jar!/BOOT-INF/classes!/mapper/MarkVisiter.xml]
### The error may involve io.dellevin.dao.MarkVisiterDao.insertVisitRecord-Inline
### The error occurred while setting parameters
### SQL: INSERT INTO mark_visiter ( visit_url, ip, ip_addr, create_time) VALUES ( ?, ?, ?, NOW() )
### Cause: com.mysql.cj.jdbc.exceptions.MysqlDataTruncation: Data truncation: Data too long for column 'ip_addr' at row 1
; Data truncation: Data too long for column 'ip_addr' at row 1; nested exception is com.mysql.cj.jdbc.exceptions.MysqlDataTruncation: Data truncation: Data too long for column 'ip_addr' at row 1
org.springframework.dao.DataIntegrityViolationException:
只能用流方式加载文件,于是采用如下方式:可以使用一个临时文件来处理这个问题。首先读取输入流,然后将其写入一个临时文件,最后将该临时文件的路径作为 dbPath
String dbPath = null;
// 1、从 dbPath 中预先加载 VectorIndex 缓存
try (InputStream inputStream = GetIpAddr.class.getClassLoader().getResourceAsStream("ip2region/ip2region.xdb")) {
if (inputStream == null) {
throw new FileNotFoundException("Resource not found: ip2region/ip2region.xdb");
}
// 创建临时文件
File tempFile = Files.createTempFile("ip2region", ".xdb").toFile();
try (FileOutputStream outputStream = new FileOutputStream(tempFile)) {
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
}
// 获取临时文件路径
dbPath = tempFile.getAbsolutePath();
} catch (IOException e) {
System.out.printf("failed to load vector index: %s\n", e);
return "failed to load vector index: " + e + " ";
}