Question

我正在开发一个Spring Boot应用程序，在这里我试图为bean配置自定义属性，从而为我的文件提供了扩展名。当我运行该应用程序时，它成功运行并出现0个错误，但未从application.properties文件中加载扩展。

这是我在application.properties中的代码：-----

suppourted.extensions[0]="jpg"
suppourted.extensions[1]="pdf"
suppourted.extensions[2]="png"

这是bean的代码：-

package com.MyBoot.FirstBoot;

import java.util.ArrayList;
import java.util.List;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;


@ConfigurationProperties(prefix = "suppourted")
public class SuppourtedFiles {

    private List<String> extensions=new ArrayList<>();

    public List<String>getExtensions() {
        return extensions;
    }

    public void setExtensions(List<String>extensions) {
        this.extensions = extensions;
    }

    @Override
    public String toString() {
        return "SuppourtedFiles [extensions=" + extensions.size() + "]";
    }

}

我的主要SpringBootApplication：----

package com.MyBoot.FirstBoot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;


@SpringBootApplication

public class FirstBoot1Application {

    public static void main(String[] args) {
        SpringApplication.run(FirstBoot1Application.class, args);
    }

}

我不知道问题出在哪里。请帮助我。

更新：-

我想将该对象发送到我的jsp页面以使用模型显示它，而不仅仅是在CommandLineRunner中创建该bean

Answer 1

如果我没记错，您应该使用

@Configuration

在您的SuppourtedFiles类中或

@EnableConfigurationProperties(SuppourtedFiles.class)

在您的FirstBoot1Application中。

Answer 2

下面的希望会起作用，

应用程序：

package com.MyBoot.FirstBoot;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;


@SpringBootApplication
@EnableConfigurationProperties(SuppourtedFiles.class)
public class FirstBoot1Application implements CommandLineRunner {
    private final SuppourtedFiles suppourtedFiles;

    public FirstBoot1Application(SuppourtedFiles suppourtedFiles) {
        this.suppourtedFiles = suppourtedFiles;
    }

    @Override
    public void run(String... args) throws Exception {
        System.out.println(suppourtedFiles);
    }

    public static void main(String[] args) {
        SpringApplication.run(FirstBoot1Application.class, args);
    }

}

配置类：

package com.MyBoot.FirstBoot;

import org.springframework.boot.context.properties.ConfigurationProperties;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;


@ConfigurationProperties(prefix = "suppourted")
public class SuppourtedFiles {

    private List<String> extensions = new ArrayList<>();

    public List<String> getExtensions() {
        return extensions;
    }

    public void setExtensions(List<String> extensions) {
        this.extensions = extensions;
    }

    @Override
    public String toString() {
        return "com.MyBoot.FirstBoot.SuppourtedFiles [extensions=" + Arrays.toString(extensions.toArray()) + "]"; // Changed to check if array is filled from spring or not.
    }

}

最小的Maven依赖项

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
    </dependencies>

注释处理器的可选依赖项：

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-configuration-processor</artifactId>
  <optional>true</optional>
</dependency>

请确保您的项目包装为jar或war

控制器：

@RestController
public class SampleController {
    private final SuppourtedFiles suppourtedFiles;

    public SampleController(SuppourtedFiles suppourtedFiles) {
        this.suppourtedFiles = suppourtedFiles;
    }

    @GetMapping("/extensions")
    public ResponseEntity<List<String>> extensions(){
        return ResponseEntity.ok(suppourtedFiles.getExtensions());
    }
}

控制器依赖性：

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

Answer 3

您应该在@Configuration类上拥有SuppourtedFiles，并且在@EnableConfigurationProperties类上拥有FirstBoot1Application，并添加org.springframework.boot:spring-boot-configuration-processor依赖项。

package com.MyBoot.FirstBoot;

import java.util.ArrayList;
import java.util.List;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;

@Configuration
@ConfigurationProperties(prefix = "suppourted")
public class SuppourtedFiles {
    //You should not create the extensions object just declare it
    private List<String> extensions;

    public List<String>getExtensions() {
        return extensions;
    }
    public void setExtensions(List<String>extensions) {
        this.extensions = extensions;
    }
}

package com.MyBoot.FirstBoot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@EnableConfigurationProperties
public class FirstBoot1Application {

    public static void main(String[] args) {
        SpringApplication.run(FirstBoot1Application.class, args);
    }

}

而且在属性中，您不需要双引号。你可以拥有

suppourted.extensions[0]=jpg
suppourted.extensions[1]=pdf
suppourted.extensions[2]=png

Spring Boot未加载@ConfigurationProperties

3 个答案: