我正在使用@Bean註釋定義bean,並嘗試使用名稱連接它們,但接收到異常。無法在Spring Boot應用程序中注入多個ObjectMapper bean
完整的例子
package com.example;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import com.fasterxml.jackson.databind.ObjectMapper;
@SpringBootApplication
@ComponentScan({"com.example"})
public class SampleSpringBootApplication {
public static void main(String[] args) {
SpringApplication.run(SampleSpringBootApplication.class, args);
}
@Bean
public ObjectMapper scmsObjectMapper() {
com.fasterxml.jackson.databind.ObjectMapper responseMapper = new com.fasterxml.jackson.databind.ObjectMapper();
return responseMapper;
}
@Bean
public ObjectMapper scmsWriteObjectMapper() {
com.fasterxml.jackson.databind.ObjectMapper responseMapper = new com.fasterxml.jackson.databind.ObjectMapper();
return responseMapper;
}
}
控制器
package com.example;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class SampleController {
@RequestMapping(method={RequestMethod.GET}, value="sample/hello", produces=MediaType.APPLICATION_JSON_VALUE)
@ResponseStatus(HttpStatus.OK)
public @ResponseBody ResponseEntity<String> getCart() {
return new ResponseEntity<String>("Hello", HttpStatus.OK);
}
}
的build.gradle
buildscript {
ext {
springBootVersion = '1.2.7.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath('io.spring.gradle:dependency-management-plugin:0.5.2.RELEASE')
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'spring-boot'
apply plugin: 'io.spring.dependency-management'
jar {
baseName = 'Sample-SpringBoot'
version = '0.0.1-SNAPSHOT'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter')
testCompile('org.springframework.boot:spring-boot-starter-test')
compile("org.springframework.boot:spring-boot-starter-web:1.2.3.RELEASE")
compile('com.fasterxml.jackson.core:jackson-databind:2.5.1')
}
eclipse {
classpath {
containers.remove('org.eclipse.jdt.launching.JRE_CONTAINER')
containers 'org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8'
}
}
task wrapper(type: Wrapper) {
gradleVersion = '2.7'
}
異常
Caused by:
org.springframework.beans.factory.NoUniqueBeanDefinitionException: No
qualifying bean of type [com.fasterxml.jackson.databind.ObjectMapper]
is defined: expected single matching bean but found 2:
scmsObjectMapper,scmsWriteObjectMapper
對不起尼爾,這是一個錯字,當我輸入在這裏。我在我的代碼中使用了正確的限定符。 –
我無法複製此內容。請發佈完整的示例。 –
@SotiriosDelimanolis,發佈完整的例子。該服務器甚至沒有啓動,我點擊運行後彈出應用程序,我得到一個錯誤。 –