本文介绍了将 JSON 发布到控制器返回 400 错误请求的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在开发 RESTful 服务.我无法将 JSON 数据发布到控制器.

I am developing RESTful services.I am not able to POST JSON data to controller.

我正在使用以下依赖项:

I am using the following dependencies:

  • 春季:3.2.3.RELEASE
  • 杰克逊:1.9.6

我也试过:

  • Spring 3.2.3.RELEASE 和 Jackson 1.9.9
  • Spring 3.1.1.RELEASE 和 Jackson 1.9.9

如这里所建议的 将 JSON 发布到 Spring MVC 控制器返回 400 个错误请求

我也输入了 MessageConverters,

I made entries of MessageConverters also,

<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.StringHttpMessageConverter"/>
        <bean class="org.springframework.http.converter.ResourceHttpMessageConverter"/>
        <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/>
    </mvc:message-converters>
</mvc:annotation-driven>

控制器

@Controller
@RequestMapping(value="/todo", consumes="application/json", produces="application/json")
//@RequestMapping(value="/todo", consumes="text/plain", produces="application/json")
public class TodoRestService {
   Logger logger = LoggerFactory.getLogger(TodoService.class);
   @Autowired
   private TodoService todoService;

   @RequestMapping(value="/{id}", method= RequestMethod.GET)
   @ResponseBody public Todo find(@PathVariable("id") Long id) {
     Todo todo = todoService.find(id);
     return todo;
   }

   @RequestMapping(method=RequestMethod.POST)
   @ResponseBody public Todo create(@RequestBody Todo todo) {
   //public Todo create(@RequestBody String todo) {
   //public Todo create(@RequestParam("todo") String todo) {
     System.out.println(todo);
     todoService.create(newTodo);
     return newTodo;
  }
}

POJO

public class TODO {
  private String firstName;
  private String lastName;

  //getter setters
}

我正在使用邮递员来发布 JSON

I am using postman to POST the JSON

我已将 Content-Type 设置为 application/json

I have set Content-Type as application/json

表单数据-----名称 = 待办事项value = {"firstName":"nilam","lastName":"naik"}

form data -----name = todovalue = {"firstName":"nilam","lastName":"naik"}

方法 = POST

我收到 400 个错误请求.

I am getting 400 Bad Request.

但是如果我将使用@RequestBody 注释的参数的数据类型从 TODO 更改为 String 那么
我得到了类似的东西,

But If I changed data type of parameter annotated with @RequestBody from TODO to String then
I am getting something like,

------WebKitFormBoundaryu6banLlTPiPudsBB
Content-Disposition: form-data; name="todo"

{"firstName":"nilam","lastName":"naik"}
------WebKitFormBoundaryu6banLlTPiPudsBB--

我的类路径上也有 Jackson.

I also have Jackson on my classpath.

如果我将属性消耗从 application/json 更改为 text/plain 和

If I changed attribute consumes from application/json to text/plain and

@RequestBody String todo 然后我得到,

@RequestBody String todo then I get,

{"firstName":"nilam","lastName":"naik"}

但我不想手动将字符串转换为 Java 对象.但我不明白为什么@RequestBody 无法将我的 JSON 数据转换为 Java 对象.

But I don't want to manually convert the String to Java Object. But I don't understand why @RequestBody is not able to convert my JSON data to Java Object.

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-      v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.orci</groupId>
    <artifactId>OrciMavenTutorial</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>OrciMavenTutorial Maven Webapp</name>
    <url>http://maven.apache.org</url>

    <properties>
        <!-- <org.springframework.version>3.2.3.RELEASE</org.springframework.version> -->
        <org.springframework.version>3.1.1.RELEASE</org.springframework.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>

        <dependency>
             <groupId>org.hibernate</groupId>
             <artifactId>hibernate-entitymanager</artifactId>
             <version>4.2.2.Final</version>
        </dependency>

        <dependency>
             <groupId>javax.servlet</groupId>
             <artifactId>javax.servlet-api</artifactId>
             <version>3.0.1</version>
             <scope>provided</scope>
        </dependency>

        <dependency>
             <groupId>org.apache.derby</groupId>
             <artifactId>derbyclient</artifactId>
             <version>10.5.3.0_1</version>
        </dependency>

        <dependency>
              <groupId>org.apache.derby</groupId>
              <artifactId>derby</artifactId>
              <version>10.5.3.0_1</version>
        </dependency>

        <dependency>
              <groupId>org.slf4j</groupId>
              <artifactId>slf4j-api</artifactId>
              <version>1.7.7</version>
        </dependency>

        <dependency>
              <groupId>org.codehaus.jackson</groupId>
              <artifactId>jackson-core-asl</artifactId>
              <!-- <version>1.9.6</version> -->
              <!-- <version>1.4.2</version> -->
              <!-- <version>1.9.9</version> -->
              <version>1.9.7</version>
        </dependency>

       <dependency>
             <groupId>org.codehaus.jackson</groupId>
             <artifactId>jackson-mapper-asl</artifactId>
             <!-- <version>1.9.6</version> -->
             <!-- <version>1.4.2</version> -->
             <!-- <version>1.9.9</version> -->
             <version>1.9.7</version>
       </dependency>
 </dependencies>
 <build>
     <finalName>OrciMavenTutorial</finalName>
 </build>

请有人帮助我.

推荐答案

从你给出的解释中可以清楚地看出,你错误地使用了 POSTMAN.

From the explanation you have given one thing is clear, You are using POSTMAN wrongly.

您不能在 form-data 中发送带有 @RequestBody 注释的对象.使用 @ModelAttribute@RequestParam(多个)处理表单.

You can not send a @RequestBody annotated object in a form-data. Forms are handled using @ModelAttribute or @RequestParam (Multiple of this).

如果您想将 JSON 发布到控制器端点,您必须像下图那样操作;

If you want to post a JSON to an Controller end point you must do like the following image;

显然你必须选择POST并且必须设置一个标题Content-Typeapplication/json,最后你必须选择raw 从选项卡中选择 JSON 从下拉列表中.

You must select POST obviously and must set a header Content-Type as application/json, finally you must select raw from the tabs and select JSON from the dropdown.

如果你遵循这个你的控制器方法必须使用 Todo 对象作为 @RequestBody 注释并且不需要使用 String 并手动转换为对象.

If you follow this your Controller method must work with Todo object as @RequestBody annotation and no need to use String and manually convert to object.

这篇关于将 JSON 发布到控制器返回 400 错误请求的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-27 21:37
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