在spring boot Restful webService中获取映射和Pain Json文本

Question

我正在尝试解析json体请求，使用spring boot来获取post请求。我想将主体映射到vehicle类上的字段，并将纯json主体存储到某个变量，以备将来使用。但在尝试访问普通json主体时,总是会出现流关闭异常。有人能帮我解决这个问题吗。提前致谢

代码

@RequestMapping(value = "/GetDriverDetails", method = RequestMethod.POST)
public ResponseEntity<Vehicle> GetVehicleDetails(@RequestBody Vehicle vehicle, HttpServletRequest request) {
    System.out.println(vehicle);
    String json;
    if ("POST".equalsIgnoreCase(request.getMethod())) 
    {
      try {
          ContentCachingRequestWrapper request1 = new ContentCachingRequestWrapper(request);
        String collect = request1.getReader().lines().collect(Collectors.joining(System.lineSeparator()));
        System.out.println(collect);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    }
    
    return new ResponseEntity<Vehicle>(HttpStatus.OK);
}

Json请求正文

{
    "vehicleName": "Brio",
    "vehicleModel": "fisrtClass",
    "drivers": [
        {
            "name": "rej",
            "licenseNumber": "KLLicense1"
        },
        {
            "name": "Dan",
            "licenseNumber": "KLLicense2"
        },
        {
            "name": "bala",
            "licenseNumber": "KLLicense3"
        },
        {
            "name": "vijay",
            "licenseNumber": "KLLicense4"
        },
        {
            "name": "aravind",
            "licenseNumber": "KLLicense5"
        },
        {
            "name": "sathya",
            "licenseNumber": "KLLicense6"
        }
    ]
}

例外情况

java.io.IOException：流关闭在org.apache.catalina.connector.InputBuffer.Read(inputBuffer.java:359)~[Tomcat-Embed-Core-9.0.38.jar:9.0.38]在org.apache.catalina.connector.CoyoteInputStream.Read(CoyoteInputStream.java:132)~[Tomcat-Embed-Core-9.0.38.jar:9.0.38]在org.SpringFramework.web.util.ContentCachingRequestWrapper

Answer 1

尝试使用Object Mapper将vehicle对象转换为json字符串，在这种情况下，您将不需要在方法参数中请求。并且您正在使用post request方法,然后如果条件不需要。

Answer 2

你能试试下面的代码吗：

主要问题的解决方案是，由于您正在使用@RequestBody，因此内容已经被读取并映射到pojo类，因此stream被使用并关闭。在这种情况下，您根本不想使用@RequestBody。请在下面找到我的实现：

 @PostMapping(path = "update-vehicle-details", consumes = MediaType.ALL_VALUE)
        public VehicleDriver updateVehicleDetails(HttpServletRequest request) throws IOException {
            ContentCachingRequestWrapper request1 = new ContentCachingRequestWrapper(request);
            String collect = request1.getReader().lines().collect(Collectors.joining(System.lineSeparator()));
            System.out.println(collect);
            final VehicleDriver vehicleDriver = new ObjectMapper().readValue(collect, VehicleDriver.class);
            return vehicleDriver;
        }

否则，使用一种简单的方法，从requestbody中的应用程序json内容类型解析中读取值，并将该主体转换为字符串并返回相同的结果

@RestController
    public static class TestController {

        @PostMapping(path = "update-vehicle-details", consumes = MediaType.APPLICATION_JSON_VALUE)
        public String updateVehicleDetails(@RequestBody VehicleDriver vehicleDriver) throws JsonProcessingException {
            final StringBuilder stringBuilder = new StringBuilder(vehicleDriver.vehicleName);
            List<String> driverDetails = Optional.ofNullable(
                    vehicleDriver.drivers)
                    .map(Collection::stream)
                    .orElse(Stream.empty())
                    .map(d -> "name=: " + d.name + ", license number:" + d.licenseNumber)
                    .collect(Collectors.toList());
            stringBuilder.append("\n");
            stringBuilder.append(driverDetails);
            String stringRepresentationOfBody = new ObjectMapper().writeValueAsString(vehicleDriver);
//            return stringBuilder.toString();
            return stringRepresentationOfBody;
        }

    }

    public static class VehicleDriver {
        public String vehicleName;
        public String vehicleModel;
        public List<Driver> drivers;
    }

    public static class Driver {
        public String name;
        public String licenseNumber;
    }