spring boot application showing ??? characters instead of unicode

问题

While reading from database the logs in my dao class shows junk characters in place of unicode characters. Sql developer shows correct values from oracle database also correct NLS language encoding is set on the database.

Below code works for standard jdbc:

connection = DriverManager.getConnection(
"jdbc:oracle:thin:@localhost:1521:xe", "adminuser", "oracle");
Statement st=connection.createStatement();
ResultSet res=st.executeQuery("SELECT menu_item_name from pending_menu_item 
where menu_item_id=6062");

    while(res.next()){
        System.out.println("itemName: "+res.getString(1));
    }

Below is the url for springboot project which shows junk characters, I uploaded to git hub.https://github.com/AyubOpen/spring-boot-jdbc/

package com.mkyong;

import com.mkyong.dao.CustomerRepository;
import com.zaxxer.hikari.HikariDataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.jdbc.core.JdbcTemplate;
import javax.sql.DataSource;
import java.util.List;
import static java.lang.System.exit;

@SpringBootApplication
public class SpringBootConsoleApplication implements CommandLineRunner {

@Autowired
DataSource dataSource;

@Autowired
private CustomerRepository customerRepository;

@Autowired
private JdbcTemplate jdbcTemplate;

  public static void main(String[] args) throws Exception {
      SpringApplication.run(SpringBootConsoleApplication.class, args);
}

@Override
public void run(String... args) throws Exception {

// If you want to check the HikariDataSource settings
 HikariDataSource newds = (HikariDataSource)dataSource;
  System.out.println("getMaximumPoolSize = " + ((HikariDataSource) 
  dataSource).getMaximumPoolSize());
  System.out.println("DATASOURCE = " + 
  newds.getDataSourceProperties().getProperty("hikari.useUnicode"));

  if (args.length <= 0) {
    System.err.println("[Usage] java xxx.jar {display}");
   } else {
        if (args[0].equalsIgnoreCase("display")) {
        System.out.println("Display items...");
        List<String> list = customerRepository.findAll();
        list.forEach(x -> System.out.println(x));
      }
      System.out.println("Done!");
   }
  exit(0);
 }
}

package com.mkyong.dao;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
import java.util.List;

@Repository
public class CustomerRepository {

   @Autowired
   private JdbcTemplate jdbcTemplate;

   public List<String> findAll() {

    List<String> result = jdbcTemplate.query(
        "SELECT menu_item_name from pending_menu_item where 
            menu_item_id=6062",
        (rs, rowNum) -> rs.getString("menu_item_name")
    );
  return result;
  }
}

application.properties  
----------------------
spring.main.banner-mode=off
spring.datasource.initialize=true
spring.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.url=jdbc:oracle:thin:@localhost:1521/xe
spring.datasource.username=jahezdbapp
spring.datasource.password=oracle
spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver 
spring.datasource.hikari.useUnicode=true
spring.datasource.hikari.characterEncoding=utf-8 
spring.datasource.hikari.characterSetResults=utf8 

# HikariCP settings
#60 sec
spring.datasource.hikari.connection-timeout=60000
# max 5
spring.datasource.hikari.maximum-pool-size=5

回答1:

Add ?useUnicode=yes&characterEncoding=UTF-8 at the end of spring.datasource.url.
Set spring.datasource.sqlScriptEncoding=UTF-8 in application.properties

1 itself should solve the issue, 2 may not be necessary.

回答2:

Especially for Oracle. At least I was in the same situation.

It seems, your database uses some national (non-unicode) encoding. So JDBC cannot translate it to UNICODE.

Oracle JDBC by default supports only few character sets: US7ASCII, WE8DEC, WE8ISO8859P1, WE8MSWIN1252, and UTF8. So all strings encoded in different encodings will be displayed as questions. To add support of all other character sets add to the application classpath the file orai18n.jar.

See more here: https://docs.oracle.com/database/121/JJDBC/global.htm#JJDBC28643

回答3:

This issue does not seem to be with jdbc datasource, I will create a simple github project for springboot and followup on this issue with the below question:

spring boot commandline runner is using windows default character encoding

回答4:

Record: worked url for DB2, jdb

jdbc:db2://x.x.x.x:5010/xxxx:useUnicode=yes;characterEncoding=UTF-8;

来源：https://stackoverflow.com/questions/44992808/spring-boot-application-showing-characters-instead-of-unicode

标签

spring-boot

unicode

jdbctemplate