Java Springboot中的json解析错误

json parsing error in Springboot

提问by Roopesh Majeti

I have a simple springboot program which takes a json and prints it. The main intention was to do json validator package usage, but the current context is on the basic request parsing. The problem is when i tryy to map the input request into an class entity, it is giving the below error : "org.springframework.http.converter.HttpMessageNotReadableException",.

我有一个简单的 springboot 程序，它接受一个 json 并打印它。主要目的是做 json 验证器包的使用，但当前的上下文是在基本的请求解析上。问题是当我尝试将输入请求映射到类实体时，它给出了以下错误：“org.springframework.http.converter.HttpMessageNotReadableException”，。

• Controller ( Hello.java ) :

      @RequestMapping(method = RequestMethod.POST , consumes = "application/json")
      public ResponseEntity<String> welcome(
              @RequestBody DemoEntity demoEntity )
      {
          System.out.println(demoEntity.getName());
          String response ="success";
          return new ResponseEntity<>(response, HttpStatus.CREATED);
      }
  }
  

• Java Class entity :

  public class DemoEntity implements Serializable {

      @JsonProperty("name")
      private String name;
      @JsonProperty("no")
      private int no;
  
      public int getNo() {
          return no;
      }
  
      public void setNo(int no) {
          this.no = no;
      }
  
      public String getName() {
          return name;
      }
  
      public void setName(String name) {
          this.name = name;
      }
  
      DemoEntity(String name)
      {
          this.name = name;
      }
  }
  

  • Complete Exception :

  { "timestamp": 1497594485418, "status": 400, "error": "Bad Request", "exception": "org.springframework.http.converter.HttpMessageNotReadableException", "message": "JSON parse error: Unexpected character ('-' (code 45)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value; nested exception is com.fasterxml.Hymanson.core.JsonParseException: Unexpected character ('-' (code 45)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value\n at [Source: java.io.PushbackInputStream@75be93a7; line: 1, column: 3]", "path": "/welcome" }

• 控制器（Hello.java）：

      @RequestMapping(method = RequestMethod.POST , consumes = "application/json")
      public ResponseEntity<String> welcome(
              @RequestBody DemoEntity demoEntity )
      {
          System.out.println(demoEntity.getName());
          String response ="success";
          return new ResponseEntity<>(response, HttpStatus.CREATED);
      }
  }
  

• Java 类实体：

  公共类 DemoEntity 实现了 Serializable {

      @JsonProperty("name")
      private String name;
      @JsonProperty("no")
      private int no;
  
      public int getNo() {
          return no;
      }
  
      public void setNo(int no) {
          this.no = no;
      }
  
      public String getName() {
          return name;
      }
  
      public void setName(String name) {
          this.name = name;
      }
  
      DemoEntity(String name)
      {
          this.name = name;
      }
  }
  

  • 完全异常：

  {“时间戳”：1497594485418，“状态”：400，“错误”：“错误请求”，“异常”：“org.springframework.http.converter.HttpMessageNotReadableException”，“消息”：“JSON解析错误：意外字符（ '-'（代码 45））在数值中：预期数字 (0-9) 跟随减号，对于有效数值；嵌套异常是 com.fasterxml.Hymanson.core.JsonParseException：意外字符（'-'（代码） 45)) 数值：预期数字 (0-9) 跟随减号，对于有效数值\n 在 [来源：java.io.PushbackInputStream@75be93a7; 行：1，列：3]"，"路径" ： “/欢迎” }

Sample inputrequest in the body : {"name":"Roopesh", "no":123123}

正文中的示例输入请求：{"name":"Roopesh", "no":123123}

采纳答案by invenit

You send incorrect request. Use curl -X POST localhost:8090/one -H 'content-type: application/json;charset=UTF-8' -H 'name: test' -H 'postman-token: 8e87369d-e2e2-ab25-eadd-f40f0682e593' -d '{"name":"Roopesh", "no":"123123"}'

您发送了错误的请求。用curl -X POST localhost:8090/one -H 'content-type: application/json;charset=UTF-8' -H 'name: test' -H 'postman-token: 8e87369d-e2e2-ab25-eadd-f40f0682e593' -d '{"name":"Roopesh", "no":"123123"}'

1. Don't sent demoEntity=. Body should contains just json itself.
2. Use -dkey to send data. -Fis for multipart body. It is a little bit different.

1. 不送demoEntity=。Body 应该只包含 json 本身。
2. 使用-d密钥发送数据。-F用于多部分身体。它有点不同。

回答by Kundan Atre

Incase if you are using Postman client to test your Rest API, there are chances wherein you must be adding body in under tab "form-data"rather "raw".

如果您使用 Postman 客户端来测试您的 Rest API，则有可能您必须在选项卡"form-data"而不是"raw"下添加正文。