Java 尝试使用 Spring Boot REST 从 POST 读取 JSON 字符串
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Trying to use Spring Boot REST to Read JSON String from POST
提问by PacificNW_Lover
Am using the latest version of Spring Boot to read in a sample JSON via Restful Web Service...
我正在使用最新版本的 Spring Boot 通过 Restful Web 服务读取示例 JSON...
Here's my pom.xml:
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>
Here's my web service code:
这是我的网络服务代码：
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);
}
}
When I invoke it using the following command:
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
I get this error message:
我收到此错误消息：
{"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.Hymanson.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"
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"}
我唯一想做的就是传入一些有效的 JSON（作为通过 curl 的字符串）并查看 String 负载是否以 {"name":"value"} 的形式进入 process 方法
What am I possibly doing wrong?
我可能做错了什么？
Thank you for taking the time to read this...
感谢您抽出时间来阅读...
采纳答案by Andrea
I think the simplest/handy way to consuming JSON is using a Java class that resembles your JSON: https://stackoverflow.com/a/6019761
我认为使用 JSON 的最简单/方便的方法是使用类似于您的 JSON 的 Java 类：https: //stackoverflow.com/a/6019761
But if you can't use a Java class you can use one of these two solutions.
但是，如果您不能使用 Java 类，则可以使用这两种解决方案之一。
Solution 1:you can do it receiving a Map<String, Object>from your controller:
解决方案 1：您可以Map<String, Object>从控制器接收 a ：
@RequestMapping(
value = "/process",
method = RequestMethod.POST)
public void process(@RequestBody Map<String, Object> payload)
throws Exception {
System.out.println(payload);
}
Using your request:
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
Solution 2:otherwise you can get the POST payload as a String:
解决方案 2：否则您可以将 POST 有效负载作为String：
@RequestMapping(
value = "/process",
method = RequestMethod.POST,
consumes = "text/plain")
public void process(@RequestBody String payload) throws Exception {
System.out.println(payload);
}
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:
然后根据需要解析字符串。请注意，必须consumes = "text/plain"在您的控制器上指定。在这种情况下，您必须使用以下命令更改您的请求Content-type: text/plain：
curl -H "Accept: application/json" -H "Content-type: text/plain" -X POST \
-d '{"name":"value"}' http://localhost:8080/myservice/process
回答by Master Slave
The issue appears with parsing the JSON from request body, tipical for an invalid JSON. If you're using curl on windows, try escaping the json like -d "{"name":"value"}"or even -d "{"""name""":"value"""}"
问题出现在从请求正文解析 JSON 时，典型的无效 JSON。如果您在 Windows 上使用 curl，请尝试转义 json-d "{"name":"value"}"甚至-d "{"""name""":"value"""}"
On the other hand you can ommit the content-type header in which case whetewer is sent will be converted to your String argument
另一方面，您可以省略 content-type 标头，在这种情况下，发送的 whetewer 将转换为您的 String 参数
回答by S. Pan
To add on to Andrea's solution, if you are passing an array of JSONs for instance
要添加到 Andrea 的解决方案，例如，如果您要传递 JSON 数组
[
{"name":"value"},
{"name":"value2"}
]
Then you will need to set up the Spring Boot Controller like so:
然后你需要像这样设置 Spring Boot 控制器：
@RequestMapping(
value = "/process",
method = RequestMethod.POST)
public void process(@RequestBody Map<String, Object>[] payload)
throws Exception {
System.out.println(payload);
}
回答by Rusli Usman
To further work with array of maps, the followings could help:
要进一步处理地图数组，以下内容可能会有所帮助：
@RequestMapping(value = "/process", method = RequestMethod.POST, headers = "Accept=application/json")
public void setLead(@RequestBody Collection<? extends Map<String, Object>> payload) throws Exception {
List<Map<String,Object>> maps = new ArrayList<Map<String,Object>>();
maps.addAll(payload);
}
回答by Mateusz Stefek
To receive arbitrary Json in Spring-Boot, you can simply use Hymanson's JsonNode. The appropriate converter is automatically configured.
要在 Spring-Boot 中接收任意 Json，您可以简单地使用 Hymanson 的JsonNode. 相应的转换器会自动配置。
@PostMapping(value="/process")
public void process(@RequestBody com.fasterxml.Hymanson.databind.JsonNode payload) {
System.out.println(payload);
}
