org.springframework.core.codec.DecodingException: JSON decoding error: Cannot deserialize value of type `java.lang.Long` from String

org.springframework.core.codec.DecodingException是一个Spring框架中的异常，它发生在尝试将JSON字符串解码为Java对象时出错的情况。错误消息指出“Cannot deserialize value of type `java.lang.Long` from String”，这意味着在尝试将接收到的JSON字符串转换为Long类型的值时遇到了问题，可能是JSON数据中的相应字段无法解析成有效的长整型数值，或者是格式不正确。

举个例子，如果你有一个预期应该是数字字面量的JSON字段，如`"123"`，但是实际的JSON字符串中包含的是非数字字符或者其他不能转化为Long的内容，就会抛出这个异常。

要解决这个问题，你需要检查以下几点：
1. 确认JSON字符串是否格式正确并且包含可以转换为Long的有效值。
2. 检查目标属性是否声明为Long类型，如果不是，则需要调整映射策略。
3. 如果是在使用Spring MVC，确认Model绑定规则设置正确，比如使用`@JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ss.SSSZ")`来指定日期时间的JSON格式。

相关问题

网关Consider defining a bean of type 'org.springframework.http.codec.ServerCodecConfigurer' in your configuration.

To define a bean of type 'org.springframework.http.codec.ServerCodecConfigurer' in your configuration, you can follow these steps:

1. Create a configuration class or add the following method to an existing configuration class:

@Configuration
public class MyConfig {

    @Bean
    public ServerCodecConfigurer serverCodecConfigurer() {
        return ServerCodecConfigurer.create();
    }

    // other configuration methods...
}

2. Make sure that you have the required dependencies in your project's build file (e.g., pom.xml for Maven):

<dependencies>
    <!-- other dependencies -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-webflux</artifactId>
    </dependency>
</dependencies>

Note: The 'spring-boot-starter-webflux' dependency includes the necessary classes for HTTP encoding and decoding.

3. After defining the bean, you should be able to use it in your gateway or other components by autowiring it:

@Autowired
private ServerCodecConfigurer serverCodecConfigurer;

This should resolve the issue related to the 'ServerCodecConfigurer' bean. Let me know if you need further assistance!

package main import ( "bytes" "encoding/json" "fmt" "net/http" "github.com/gin-gonic/gin" ) type AlertData struct { Receiver string `json:"receiver"` Status string `json:"status"` Alerts []Alert `json:"alerts"` GroupLabels map[string]string `json:"groupLabels"` CommonLabels map[string]string `json:"commonLabels"` CommonAnnotations map[string]string `json:"commonAnnotations"` ExternalURL string `json:"externalURL"` } type Alert struct { Status string `json:"status"` Labels map[string]string `json:"labels"` Annotations map[string]string `json:"annotations"` } func main() { router := gin.Default() router.POST("/webhook", handleWebhook) router.Run(":8080") } func handleWebhook(c *gin.Context) { var alertData AlertData err := c.BindJSON(&alertData) if err != nil { c.JSON(http.StatusBadRequest, gin.H{"error": "Error decoding JSON"}) return } // Process the received alert data for _, alert := range alertData.Alerts { // Extract information from alert alertName := alert.Labels["alertname"] instance := alert.Labels["instance"] severity := alert.CommonLabels["severity"] description := alert.Annotations["description"] summary := alert.Annotations["summary"] // Compose the message to be sent to Enterprise WeChat group using Markdown format message := fmt.Sprintf(`**Alert Name:** %s **Instance:** %s **Severity:** %s **Description:** %s **Summary:** %s`, alertName, instance, severity, description, summary) // Send the message to Enterprise WeChat group using the WeChat bot API sendToEnterpriseWeChatGroup(message) } c.JSON(http.StatusOK, gin.H{"message": "Alerts processed successfully"}) } func sendToEnterpriseWeChatGroup(message string) { // Replace 'YOUR_WECHAT_BOT_URL' with the actual URL of your Enterprise WeChat bot wechatBotURL := "YOUR_WECHAT_BOT_URL" data := map[string]interface{}{ "msgtype": "markdown", "markdown": map[string]string{ "content": message, }, } jsonData, _ := json.Marshal(data) _, err := http.Post(wechatBotURL, "application/json", bytes.NewReader(jsonData)) if err != nil { fmt.Println("Error sending message to Enterprise WeChat group:", err) } } 将以上代码拆分成多个模块

将以上代码拆分为多个模块，可以按照以下方式进行组织：

**main.go：**

package main

import (
	"github.com/gin-gonic/gin"
	"net/http"
)

func main() {
	router := gin.Default()
	router.POST("/webhook", handleWebhook)
	router.Run(":8080")
}

**alert.go：**

package main

type AlertData struct {
	Receiver          string            `json:"receiver"`
	Status            string            `json:"status"`
	Alerts            []Alert           `json:"alerts"`
	GroupLabels       map[string]string `json:"groupLabels"`
	CommonLabels      map[string]string `json:"commonLabels"`
	CommonAnnotations map[string]string `json:"commonAnnotations"`
	ExternalURL       string            `json:"externalURL"`
}

type Alert struct {
	Status      string            `json:"status"`
	Labels      map[string]string `json:"labels"`
	Annotations map[string]string `json:"annotations"`
}

**webhook.go：**

package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"github.com/gin-gonic/gin"
	"net/http"
)

func handleWebhook(c *gin.Context) {
	var alertData AlertData

	err := c.BindJSON(&alertData)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Error decoding JSON"})
		return
	}

	// Process the received alert data
	for _, alert := range alertData.Alerts {
		// Extract information from alert
		alertName := alert.Labels["alertname"]
		instance := alert.Labels["instance"]
		severity := alert.CommonLabels["severity"]
		description := alert.Annotations["description"]
		summary := alert.Annotations["summary"]

		// Compose the message to be sent to Enterprise WeChat group using Markdown format
		message := fmt.Sprintf(`**Alert Name:** %s
**Instance:** %s
**Severity:** %s
**Description:** %s
**Summary:** %s`,
			alertName, instance, severity, description, summary)

		// Send the message to Enterprise WeChat group using the WeChat bot API
		sendToEnterpriseWeChatGroup(message)
	}

	c.JSON(http.StatusOK, gin.H{"message": "Alerts processed successfully"})
}

**wechat.go：**

package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
)

func sendToEnterpriseWeChatGroup(message string) {
	// Replace 'YOUR_WECHAT_BOT_URL' with the actual URL of your Enterprise WeChat bot
	wechatBotURL := "YOUR_WECHAT_BOT_URL"

	data := map[string]interface{}{
		"msgtype": "markdown",
		"markdown": map[string]string{
			"content": message,
		},
	}

	jsonData, _ := json.Marshal(data)

	_, err := http.Post(wechatBotURL, "application/json", bytes.NewReader(jsonData))
	if err != nil {
		fmt.Println("Error sending message to Enterprise WeChat group:", err)
	}
}

通过将不同功能的代码拆分到不同的模块中，可以更好地组织代码，提高代码的可读性和可维护性。在`main.go`中导入其他模块，并在适当的地方调用相应的函数即可。