[英]How to solve this springmvc / json response error
如何在Spring應用程序中編寫REST API? 我收到此錯誤:
由該請求標識的資源僅能夠生成具有根據請求“接受”標頭不可接受的特征的響應。
我試了很多 我的代碼如下所示:
mvc-dispatcher-servlet.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">
<context:component-scan base-package="com.mkyong.common.controller" />
<mvc:annotation-driven />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/pages/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
</beans>
web.xml
<web-app id="WebApp_ID" version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Spring Web MVC Application</display-name>
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/movie/*</url-pattern>
</servlet-mapping>
</web-app>
控制器類文件
package com.mkyong.common.controller;
import java.util.ArrayList;
import java.util.List;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import com.mkyong.common.model.UserBean;
@Controller
@RequestMapping("/movie")
public class MovieController {
@RequestMapping(value="/response", method = RequestMethod.GET)
public @ResponseBody List<UserBean> getMovie() {
UserBean bean = new UserBean();
List<UserBean> list = new ArrayList<UserBean>();
bean.setId("xx");
bean.setFirstname("xxx");
bean.setLastname("xxx");
bean.setSal("xxxx");
list.add(bean);
return list;
}
}
UserBean類
package com.mkyong.common.model;
public class UserBean {
private String id;
private String firstname;
private String lastname;
private String sal;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
public String getSal() {
return sal;
}
public void setSal(String sal) {
this.sal = sal;
}
}
Spring無法將對象轉換為JSON。 確保您的類路徑中有jackson-databind
。 如果您使用的是Maven,請將其添加到pom.xml
:
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.4.3</version>
</dependency>
您可以使用控制器上@RequestMapping的“ consumes”和“ produces”屬性來指定請求/響應的映射類型。 例如,如果您在json中發送請求,並且在json中也收到響應,則應使用
@RequestMapping(value="/response", method = RequestMethod.GET, consumes = "application/json", produces = "application/json" )
檢查您的要求:
您的錯誤是指“ accept”標頭,因此我認為問題是您需要指定“ produces”屬性
最終,這個內容協商者工作了:
<mvc:annotation-driven content-negotiation-manager="contentNegotiationManager" />
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