Headline

Processing JSON with the Jackson DataBinding API using a POJO representation

Characteristics

This contribution process a company saved in a JSON-file to a company object. It performs the Features Total , Cut ,Parsing and Unparsing, to demonstrate how to use a POJO parsed from a JSON file.

Illustration

This contribution uses a ObjectMapper for parsing and unparsing. The mapper provides methods to easily map between most kinds of Java object and a JSON file. In this case the mapper maps the JSON directly to a POJO company.

public static Company parse(File file) {
    ObjectMapper mapper = new ObjectMapper();
    Company company = null;
    try {
        company = mapper.readValue(file, Company.class);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return company;
}
The class Unparsing used a ObjectWriter to prettyprint the company to its JSON representation.
    ObjectMapper mapper = new ObjectMapper();
    PrettyPrinter printer = new DefaultPrettyPrinter();
    ObjectWriter writer = mapper.writer(printer);
The cut and total method are implemented without further use of the Jackson API.
public static double total(Company c) {
    double result = 0.0;
    if (c.getDepartments() != null)
        for (Department d : c.getDepartments())
            result += total(d);
    return result;
}

Usage

Use Gradle to build this contribution. For running and editing this contribution supports Eclipse.

See https://github.com/101companies/101simplejava/blob/master/README.md

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