驗證模型，當它從春季json字符串中創建

我準備從json字符串中使用json傑克遜對象映射器在春天模型。驗證模型，當它從春季json字符串中創建

我的代碼是

ObjectMapper mapper = new ObjectMapper(); 
    String empValue = mapper.writeValueAsString(employeeMap); 
    Employees employee = mapper.readValue(empValue, Employees.class);

，因爲如果任何不匹配的數據，將其通過例外，在準備model.How我能做到這一點準備的員工，我想驗證的JSON對象之前？

來源

2016-05-25 Iftekher Uddin Majumder

我不確定我是否完全理解用例。我認爲employeeMap是僱用值。那麼爲什麼它不應該是有效的，如果writeValueAsString沒有拋出任何異常？你的意思是業務驗證？ –

假設age是Employee類的一個屬性，並且我給這個屬性賦了一個字符串值。當從json準備對象時，它通過異常但是從這個異常我無法理解員工的哪個屬性容易出錯 –

您能指定您正在使用的傑克遜和春季版本 –

你可以得到一些有價值的信息出來的異常主要是出於使用的getPath和JsonMappingException類和它的子類（在com.fasterxml.jackson.databind.exc包下）的getPathReference方法

下面是兩個例子：

public class ObjectMapperTest { 
    private ObjectMapper objectMapper; 

    @Before 
    public void setup() { 
     objectMapper = new ObjectMapper(); 
    } 

    @Test 
    public void testWrongDataType() { 
     String personStr = "{\"age\":\"100Y\",\"firstName\":\"Jackson\",\"lastName\":\"Pollock\",\"gender\":\"M\"}"; 
     try { 
      objectMapper.readValue(personStr, Person.class); 
     } catch (JsonMappingException jme) { 
       System.out.println(jme.getMessage()); 
       if(jme instanceof InvalidFormatException) { 
        InvalidFormatException ife = (InvalidFormatException)jme; 
        System.out.println("Mapping failure on field:" + ife.getPathReference()); 
        System.out.println("Expected type: " + ife.getTargetType()); 
        System.out.println("provided value: " + ife.getValue()); 
       } 
     }catch (Exception e){ 
      System.out.println(e.getMessage()); 
     } 
    } 

    @Test 
    public void testUnrecognizedProperty() { 
     String personStr = "{\"gae\":\"100\",\"firstName\":\"Jackson\",\"lastName\":\"Pollock\",\"gender\":\"M\"}"; 
     try { 
      objectMapper.readValue(personStr, Person.class); 
     } catch (JsonMappingException jme) { 
      System.out.println(jme.getMessage()); 
      if(jme instanceof PropertyBindingException) { 
       PropertyBindingException pbe = (PropertyBindingException) jme; 
       System.out.println("Mapping failure on field:" + pbe.getPathReference()); 
       System.out.println("UnExpected field: " + pbe.getPropertyName()); 
      } 
     }catch (Exception e){ 
      System.out.println(e.getMessage()); 
     } 
    } 
}

的輸出將是

testUnrecognizedProperty: 
======================== 
Unrecognized field "gae" (class Person), not marked as ignorable (4 known properties: "lastName", "gender", "firstName", "age"]) 
at [Source: {"gae":"100","firstName":"Jackson","lastName":"Pollock","gender":"M"}; line: 1, column: 9] (through reference chain: Person["gae"]) 
Mapping failure on field:Person["gae"] 
UnExpected field: gae 
testWrongDataType: 
======================== 
Can not construct instance of java.lang.Integer from String value '100Y': not a valid Integer value 
at [Source: {"age":"100Y","firstName":"Jackson","lastName":"Pollock","gender":"M"}; line: 1, column: 2] (through reference chain: Person["age"]) 
Mapping failure on field:Person["age"] 
Expected type: class java.lang.Integer 
provided value: 100Y

來源

2016-05-26 04:58:22

驗證模型，當它從春季json字符串中創建

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