Inject all keys and Values from property file as Map in Spring

Question

Can someone provide some idea to inject all dynamic keys and values from property file and pass it as Map to DBConstants class using Setter Injection with Collection.

Keys are not known in advance and can vary.

// Example Property File that stores all db related details
// db.properties

db.username.admin=root
db.password.admin=password12
db.username.user=admin
db.password.user=password13

DBConstants contains map dbConstants for which all keys and values need to be injected.

Please provide bean definition to inject all keys and values to Map dbConstants.

public class DBConstants {

    private Map<String,String> dbConstants;

    public Map<String, String> getDbConstants() {
        return dbConstants;
    }

    public void setDbConstants(Map<String, String> dbConstants) {
        this.dbConstants = dbConstants;
    }
}

Are you using Spring Boot or just regular Spring Framework? – Rafal G. Feb 11 '17 at 18:43 — Rafal G., Feb 11 '17 at 18:43

score 5 · Accepted Answer · answered Feb 11 '17 at 19:38

5

You can create PropertiesFactoryBean with your properties file and then inject it with @Resource annotation where you want to use it as a map.

@Bean(name = "myProperties")
public static PropertiesFactoryBean mapper() {
    PropertiesFactoryBean bean = new PropertiesFactoryBean();
    bean.setLocation(new ClassPathResource("prop_file_name.properties"));
    return bean;
}

Usage:

@Resource(name = "myProperties")
private Map<String, String> myProperties;

answered Feb 11 '17 at 19:38

Monzurul Shimul

8,132
2
28
42

2

@Alex_Java: Instead of `Map` you can use `Properties`, both in the example above and in general. – Pino Jun 27 '18 at 15:25
I wasn't able to define the resource as a `Map` and had to use `Properties` as suggested above. – sheldonkreger Oct 31 '18 at 18:12

score 2 · Answer 2 · answered Jun 13 '17 at 18:44

2

you can use @Value.

Properties file:

dbConstants={key1:'value1',key2:'value2'}

Java code:

@Value("#{${dbConstants}}")
private Map<String,String> dbConstants;

answered Jun 13 '17 at 18:44

Marcos Nunes

1,265
12
12

It does not work for me. Spring 'treats' this property as a String and cannot cast to Map. – Denys Oct 04 '17 at 16:47
What version of spring are you using? Have you tried out a newer version? – Marcos Nunes Oct 05 '17 at 20:26
what new version do you mean? From what version spring supports it? – Denys Oct 06 '17 at 14:33
I got the issue... which got resolved by using like this.. https://stackoverflow.com/a/47451205/3450440 – raji Nov 23 '17 at 08:57

score 0 · Answer 3 · answered Jul 21 '22 at 06:18

0

you have to give spaces its like

hash.key = {indoor: 'reading', outdoor: 'fishing'}

Read map like below as i mentioned.

@Value("#{${hash.key}}")
private Map<String, String> hobbies;

answered Jul 21 '22 at 06:18

Srikanth Reddy

1

Inject all keys and Values from property file as Map in Spring

3 Answers3

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