com.dhenton9000.json.JacksonFromStringDemo.java Source code

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Here is the source code for com.dhenton9000.json.JacksonFromStringDemo.java

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package com.dhenton9000.json;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.List;
import org.apache.commons.io.FileUtils;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.type.TypeFactory;

/**
 * http://wiki.fasterxml.com/JacksonInFiveMinutes
 * @author dhenton
 */
public class JacksonFromStringDemo {

    private static Logger LOG = LogManager.getLogger(JacksonFromStringDemo.class);

    public void demoReadFromString() throws IOException {

        String test = "{\"id\":44444,\"name\":\"Bonzo\",\"version\":1,\"zipCode\":\"55555\",\"city\":null,\"state\":null,\"reviews\":[]}";
        ObjectMapper mapper = new ObjectMapper();
        Restaurant res = mapper.readValue(test, Restaurant.class);
        LOG.debug("restaurant " + res);

        File f = convertClassPathToFileRef("/restaurants.json");
        // LOG.debug(  FileUtils.readFileToString(f, "UTF-8"));

        List<Restaurant> restaurants = mapper.readValue(f,
                TypeFactory.collectionType(List.class, Restaurant.class));

        for (Restaurant r : restaurants) {
            LOG.debug(r.toString());
        }

    }

    public File convertClassPathToFileRef(String path) throws FileNotFoundException {

        if (this.getClass().getResource(path) != null)

            return new File(FileUtils.toFile(getClass().getResource(path)).getAbsolutePath());
        else {
            String info = String.format("unable to find file at '%s'", path);
            throw new FileNotFoundException(info);
        }
    }

    public static void main(String[] args) {

        JacksonFromStringDemo j = new JacksonFromStringDemo();
        try {
            j.demoReadFromString();
        } catch (IOException ex) {
            LOG.error("main " + ex.getMessage());
        }

    }

}