[問題] 透過post,傳送json格式到spring mvc的controller的問題

[angleevil (朦朧尋光)]

hello 大家好.
最近在spring mvc上面,透過Postman以Post的方式傳送json的格式(使用body)給controll的程式處理.
參考了網路上的做法,
但是得到以下的錯誤.
想請教一下大家,xml需要做額外設定嗎?例如:web.xml or dispatcher-servlet.xml
或是程式上有甚麼問題??

HTTP Status 400 – Bad Request

Type Status Report

Description The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).

1.輸入的json資料是(透過Post)
{"id" : "101",   "book" : "hhh", "name" : "u68t76"}

2.處理的程式如下:
@RestController
@RequestMapping("/myMain")
public class MyMainController {

        @RequestMapping(value = "/create", method = RequestMethod.POST, consumes="application/json", produces = "application/json")
        public  @ResponseBody List<JsonStr> getData(@RequestBody JsonStr jsonStr) {
                //debug
                System.out.println(jsonStr);
                repository.saveObject(jsonStr);//此段是處理mongoDB
                System.out.println(repository.getAllObjects());//此段是處理mongoDB
                return repository.getAllObjects();
        }
}

然後我的JsonStr是這樣撰寫的
import org.springframework.data.mongodb.core.mapping.Document;

@Document(collection="JsonStr")
public class JsonStr{
        private String id;
        private String  book;
        private String  name;

        public JsonStr(String id, String        book, String    name) {
                this.id = id;
                this.book = book;
                this.name = name;
        }

        public String getId() {
            return id;
        }

        public String getBook() {
                    return book;
        }

        public String getName() {
                return this.name;
        }

        public void setId(String id) {
            this.id = id;
        }

        public void setBook(String book) {
            this.book = book;
        }

        public void setName(String name) {
                this.name = name;
        }

        @Override
        public String toString() {
                return "book=" + book + ", name=" + name;
        }
}

補充
web.xml
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

        <listener>
                <listener-class>
                org.springframework.web.context.ContextLoaderListener
                </listener-class>
        </listener>

        <display-name>Archetype Created Web Application</display-name>
        <servlet>
                <servlet-name>mvc-dispatcher</servlet-name>
                <servlet-class>
                        org.springframework.web.servlet.DispatcherServlet
                </servlet-class>
                <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:/spring/mvc-dispatcher-servlet.xml</param-value>
                </init-param>
                <load-on-startup>1</load-on-startup>
        </servlet>

        <servlet-mapping>
                <servlet-name>mvc-dispatcher</servlet-name>
                <url-pattern>/</url-pattern>
        </servlet-mapping>

        <context-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:/spring/mvc-dispatcher-servlet.xml</param-value>
        </context-param>

</web-app>

mvc-dispatcher-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<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-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

        <context:component-scan base-package="com.springmvc.demo" />
        <mvc:annotation-driven />

        <bean id="natureRepository"
                class="com.springmvc.demo.repository.NatureRepositoryImpl">
                <property name="mongoTemplate" ref="mongoTemplate" />
        </bean>

        <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
                <constructor-arg name="mongo" ref="mongo" />
                <constructor-arg name="databaseName" value="nature" />
        </bean>

        <!-- Factory bean that creates the Mongo instance -->
        <bean id="mongo" class="org.springframework.data.mongodb.core.MongoFactoryBean">
                <property name="host" value="localhost" />
                <property name="port" value="27017" />
        </bean>

        <!-- Activate annotation configured components -->
        <context:annotation-config />

        <!-- Scan components for annotations within the configured package -->
        <context:component-scan base-package="com.orangeslate.naturestore">
                <context:exclude-filter type="annotation"
                        expression="org.springframework.context.annotation.Configuration" />
        </context:component-scan>

        <bean
                class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                <property name="prefix">
                        <value>/WEB-INF/views/</value>
                </property>
                <property name="suffix">
                        <value>.jsp</value>
                </property>
        </bean>

</beans>
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→ angleevil: System.out.println(jsonStr);是我插log, 根本沒資料
→ angleevil: 列印出來. 可能要麻煩大家幫忙一下
※ 編輯: angleevil (175.98.141.254), 12/07/2017 17:22:37
→ wvwvwvwvwv: jsonStr.toString() ?
→ haha02: postman的content type有選對嗎?
→ Expsun: 你用List接object
請問是甚麼意思?? repository.getAllObjects() 會return 一個List<JsonStr>

public class NatureRepositoryImpl implements Repository<JsonStr>{

        @Autowired(required=true)
        MongoTemplate mongoTemplate;

        public void setMongoTemplate(MongoTemplate mongoTemplate) {
                this.mongoTemplate = mongoTemplate;
        }

        @Override
        public List<JsonStr> getAllObjects() {
                // TODO Auto-generated method stub
                return mongoTemplate.findAll(JsonStr.class);
        }

}
→ haha02: 這個參考看看 https://goo.gl/5pbCio
太神奇了...竟然是constructor的問題. 移除後就好了!!
※ 編輯: angleevil (61.218.53.138), 12/08/2017 08:34:41
※ 編輯: angleevil (61.218.53.138), 12/08/2017 08:49:00
→ ssccg: 要給auto data binding lib的要有default constructor是滿
→ ssccg: 基本的吧
→ ssccg: 這不限於spring(jackson)應該大多數都是這樣
→ kyleJ: 不需要把建構子移除 而是要多給一個無參數建構子 預設建構
→ kyleJ: 子是Java SE基本語法的東西 建議看看良葛格網站