Java从Json文件中读取数据并封装成对象

DatabaseDriver.java

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.io.FileUtils;

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

/**
 * 数据库驱动类, 从JSON文件<b>databaseDriver.json</b>中读取数据并封装为对象.<br>
 * 
 * JSON文件格式如下:<br>
 * 
 * <pre>
 * {"db": [
 *         {
 *             "name": "PostgreSQL",
 *             "driver": "org.postgresql.Driver",
 *             "connectStr": "jdbc:postgresql://"
 *         },
 *         {
 *             "name": "MySQL",
 *             "driver": "com.mysql.jdbc.Driver",
 *             "connectStr": "jdbc:mysql://"
 *         }
 *     ]
 * }
 * </pre>
 * 
 * @author yangdm.fnst
 *
 */
public class DatabaseDriver {
    /**
     * Database Name, <b>e.g.</b> MySQL.
     */
    private String name;
    /**
     * JDBC Database Driver, <b>e.g.</b> com.mysql.jdbc.Driver.
     */
    private String driver;
    /**
     * JDBC Connect String, <b>e.g.</b> jdbc:mysql://.
     */
    private String connectStr;

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name the name to set
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * @return the driver
     */
    public String getDriver() {
        return driver;
    }

    /**
     * @param driver the driver to set
     */
    public void setDriver(String driver) {
        this.driver = driver;
    }

    /**
     * @return the connectStr
     */
    public String getConnectStr() {
        return connectStr;
    }

    /**
     * @param connectStr the connectStr to set
     */
    public void setConnectStr(String connectStr) {
        this.connectStr = connectStr;
    }

    /**
     * 获取databaseDriver.json中配置JDBC数据库信息，封装成DatabaseDriver对象.
     * 
     * @return DatabaseDriver对象数据库名称和对象的Map
     */
    public static Map<String, DatabaseDriver> getMap() {
        // 获取json文件
        File file = new File("databaseDriver.json");
        Map<String, DatabaseDriver> map = new HashMap<String, DatabaseDriver>();
        try {
            String json = FileUtils.readFileToString(file);
            Gson gson = new Gson();
            JsonParser parser = new JsonParser();
            JsonObject jsonObject = parser.parse(json).getAsJsonObject();
            // 将db节点下的内容转为JsonArray
            JsonArray jsonArray = jsonObject.getAsJsonArray("db");
            for (int i = 0; i < jsonArray.size(); i++) {
                JsonElement el = jsonArray.get(i);
                // 映射为类实例
                DatabaseDriver data = gson.fromJson(el, DatabaseDriver.class);
                map.put(data.getName(), data);
            }
        } catch (IOException e) {
        
        }
        return map;
    }
}

databaseDriver.json

{"db": [
        {
            "name": "PostgreSQL",
            "driver": "org.postgresql.Driver",
            "connectStr": "jdbc:postgresql://"
        },
        {
            "name": "MySQL",
            "driver": "com.mysql.jdbc.Driver",
            "connectStr": "jdbc:mysql://"
        }
    ]
}