尝试使用Spring Boot REST从POST读取JSON字符串

问题描述

使用最新版本的Spring Boot通过Restful Web Service读取示例JSON ...

Am using the latest version of Spring Boot to read in a sample JSON via Restful Web Service...

这是我的pom.xml：

Here's my pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
         http://maven.apache.org/maven-v4_0_0.xsd"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

    <modelVersion>4.0.0</modelVersion>

    <groupId>org.springframework</groupId>
    <artifactId>myservice</artifactId>
    <version>0.1.0</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.2.2.RELEASE</version>
    </parent>

    <properties>
        <java.version>1.7</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-rest-webmvc</artifactId>
        </dependency>
        <dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-releases</id>
            <name>Spring Releases</name>
            <url>https://repo.spring.io/libs-release</url>
        </repository>
        <repository>
            <id>org.jboss.repository.releases</id>
            <name>JBoss Maven Release Repository</name>
            <url>https://repository.jboss.org/nexus/content/repositories/releases</url>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-releases</id>
            <name>Spring Releases</name>
            <url>https://repo.spring.io/libs-release</url>
        </pluginRepository>
    </pluginRepositories>

</project>

这是我的网络服务代码：

Here's my web service code:

import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/myservice")
public class BaseService {

    @RequestMapping(value="/process", method = RequestMethod.POST)
    public void process(@RequestBody String payload) throws Exception {
        System.out.println(payload);
    }
}

当我使用以下命令调用它时：

When I invoke it using the following command:

curl -H "Accept: application/json" -H "Content-type: application/json"
-X POST -d '{"name":"value"}' http://localhost:8080/myservice/process

我收到以下错误消息：

{"timestamp":1427515733546,"status":400,
 "error":"Bad Request",

"exception":
"org.springframework.http.converter.HttpMessageNotReadableException","
 message":
 "Could not read JSON: Can not deserialize instance of java.lang.String
  out of START_OBJECT token\n at

 [Source: java.io.PushbackInputStream@8252f; line: 1, column: 1];
  nested    exception is com.fasterxml.jackson.databind.JsonMappingException:
  Can not deserialize instance of java.lang.String out of START_OBJECT token\n
  at [Source: java.io.PushbackInputStream@8252f; line: 1, column: 1]",
  "path":"/myservice/process"

我唯一想做的事情do传递一些有效的JSON（通过curl作为字符串），并查看String有效负载是否以{name：value}

The only thing I am trying to do is pass in some valid JSON (as a string via curl) and to see if the String payload enters the process method as {"name":"value"}

进入流程方法我可能做错了什么？

What am I possibly doing wrong?

感谢您花时间阅读此内容...

Thank you for taking the time to read this...

推荐答案

我认为使用JSON最简单/最方便的方法是使用类似于JSON的Java类：

I think the simplest/handy way to consuming JSON is using a Java class that resembles your JSON: https://stackoverflow.com/a/6019761

但是如果你不能使用Java类，你可以使用这两种解决方案中的一种。

But if you can't use a Java class you can use one of these two solutions.

解决方案1：您可以从控制器接收 Map< String，Object> ：

Solution 1: you can do it receiving a Map<String, Object> from your controller:

@RequestMapping(
    value = "/process",
    method = RequestMethod.POST)
public void process(@RequestBody Map<String, Object> payload)
    throws Exception {

  System.out.println(payload);

}

使用您的请求：

curl -H "Accept: application/json" -H "Content-type: application/json" \
-X POST -d '{"name":"value"}' http://localhost:8080/myservice/process

---

解决方案2：否则您可以将POST有效负载作为字符串获取：

---

Solution 2: otherwise you can get the POST payload as a String:

@RequestMapping(
    value = "/process",
    method = RequestMethod.POST,
    consumes = "text/plain")
public void process(@RequestBody String payload) throws Exception {

  System.out.println(payload);

}

然后根据需要解析字符串。请注意，必须在控制器上指定 consumes =text / plain。
在这种情况下，您必须使用更改您的请求内容类型：text / plain ：

Then parse the string as you want. Note that must be specified consumes = "text/plain" on your controller.In this case you must change your request with Content-type: text/plain:

curl -H "Accept: application/json" -H "Content-type: text/plain" -X POST \
-d '{"name":"value"}' http://localhost:8080/myservice/process

这篇关于尝试使用Spring Boot REST从POST读取JSON字符串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！