尝试使用从POST读取JSON字符串
尝试使用从POST读取JSON字符串
提问于 2015-03-28 04:26:21
我正在使用Spring的最新版本通过Restful服务读取一个示例JSON .
这是我的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web服务代码：
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：
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"我唯一要做的就是传入一些有效的JSON (通过curl作为字符串)，并查看字符串有效负载是否以{"name":"value"}的形式进入进程方法。
我到底做错什么了？
谢谢你抽出时间读这篇..。
回答 6
Stack Overflow用户
回答已采纳
发布于 2015-03-29 14:23:39
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：https://stackoverflow.com/a/6019761
但是，如果不能使用Java类，则可以使用这两种解决方案之一。
解决方案1: --您可以从控制器接收Map<String, Object>：
@RequestMapping(
value = "/process",
method = RequestMethod.POST)
public void process(@RequestBody Map<String, Object> payload)
throws Exception {
System.out.println(payload);
}利用您的请求：
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String获得
@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。注意，必须在控制器上指定consumes = "text/plain"。在这种情况下，您必须用Content-type: text/plain更改请求。
curl -H "Accept: application/json" -H "Content-type: text/plain" -X POST \
-d '{"name":"value"}' http://localhost:8080/myservice/processStack Overflow用户
发布于 2020-03-17 14:40:37
要在Spring中接收任意Json，只需使用Jackson的JsonNode即可。自动配置适当的转换器。
@PostMapping(value="/process")
public void process(@RequestBody com.fasterxml.jackson.databind.JsonNode payload) {
System.out.println(payload);
}Stack Overflow用户
发布于 2017-11-17 07:50:16
添加到Andrea的解决方案中，例如，如果要传递一个JSON数组
[
{"name":"value"},
{"name":"value2"}
]然后需要设置，如下所示：
@RequestMapping(
value = "/process",
method = RequestMethod.POST)
public void process(@RequestBody Map<String, Object>[] payload)
throws Exception {
System.out.println(payload);
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/29313687
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