The best practice of using JSON in java

The best practice of using JSON in java JSON (JavaScript Object Notation) is a lightweight data exchange format that is widely used in front -end data communication and storage.In Java, the best practice using JSON can help us process JSON data more efficiently and avoid some common errors and traps.This article will introduce some best practices that use JSON in Java and provide corresponding code examples. 1. Use the popular JSON library In Java, there are many popular JSON libraries to choose from, such as Jackson, Gson, and JSON.SIMPLE.Choosing a suitable JSON library is the first step to use JSON.The following is an example code using the Jackson library for JSON operation: // Import the related classes of the jackson library import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.JsonNode; // Create ObjectMapper objects ObjectMapper objectMapper = new ObjectMapper(); // Convert java objects to json string String jsonString = objectMapper.writeValueAsString(yourObject); // Convert json string to Java object YourObject yourObject = objectMapper.readValue(jsonString, YourObject.class); // Analyze the json string to get the attribute value JsonNode jsonNode = objectMapper.readTree(jsonString); String propertyValue = jsonNode.get("property").asText(); 2. Use the right data model When using JSON, choosing a suitable data model can better express the data structure and improve the readability and maintenance of the code.For complex JSON structures, you can use a custom Java class to be represented.Here are examples of using Jackson annotations to define the mapping relationship between Java class and JSON: import com.fasterxml.jackson.annotation.JsonProperty; public class YourObject { @JsonProperty("property1") private String property1; @JsonProperty("property2") private int property2; // omit the getter and setter method } 3. Processing abnormal situation When using JSON, we need to consider the treatment of abnormal conditions, such as JSON parsing errors, lack of fields, etc.Capture and processing abnormalities can increase the robustness of the program.The following is an example of processing JSON parsing abnormality with TRY-CATCH block: try { YourObject yourObject = objectMapper.readValue(jsonString, YourObject.class); // Other code } catch (IOException e) { // Treatment of JSON analysis abnormality e.printStackTrace(); } 4. Data verification and processing When processing JSON data, we need to check and process the data.For example, using the verification framework (such as Javax. Validation) to verify the JSON data, or use a custom verification method.Here are examples of verifying JSON using javax.validation to verify JSON: import javax.validation.Valid; import javax.validation.constraints.NotNull; public class YourObject { @JsonProperty("property1") @NotNull private String property1; // omit other attributes // omit the getter and setter method } 5. Avoid cycle references When processing the complex JSON structure containing cyclic references, we need to deal with it carefully to avoid infinite recursion.In Jackson, you can use `@jsonManageDreference` and@@jsonbackReference` to solve the problem of cycle reference.The following is an example of using annotations to solve the problem of cycle reference: import com.fasterxml.jackson.annotation.JsonBackReference; import com.fasterxml.jackson.annotation.JsonManagedReference; public class YourObject { @JsonManagedReference private YourObject childObject; @JsonBackReference private YourObject parentObject; // omit other attributes // omit the getter and setter method } By following the above best practice, we can better use JSON and give full play to the advantages of JSON as the data exchange format.Whether it is front -end data communication or data storage, good JSON processing technology can improve the quality and maintenance of code.