[英]Not able to return JSON response from Spring controler (Added jackson jars too)
我正在尝试将客户列表发送为JSON响应,但是返回的错误响应为
No converter found for return value of type: class java.util.ArrayList
@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "net.ifg.spring")
public class AppConfig {
@Bean
public Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder() {
Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
return builder;
}
}
我的控制器是
@RestController
public class CustomerRestController {
@Autowired
private CustomerDAO customerDAO;
@GetMapping("/customers")
public List<Customer> getCustomers() {
return customerDAO.list();
}
}
public class Customer {
private Long id;
private String firstName;
public Customer(long id, String firstName) {
this.id = id;
this.firstName = firstName;
}
public Customer() {
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
}
commons-logging-1.2.jar,jackson-core-asl-1.9.13.jar,jackson-mapper-asl-1.9.13.jar,jackson-databind-2.9.0.jar,spring-aop,spring-core, spring-beans,spring-context,spring-expression,spring-web,spring-webmvc(所有4.3.9版本)
仍然返回我错误响应。
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: No converter found for return value of type: class java.util.ArrayList
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
任何想法将不胜感激
在项目中添加Jackson依赖或jar。
喜欢,
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>VERSION</version></dependency>
如果是在Spring MVC中进行的,则分派器servlet的xml文件必须具有<mvc:annotation-driven />
标记,才能进行转换。
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