【转】Java操作MongoDB(3)

public void testOthers() {
    DBObject user = new BasicDBObject();
    user.put("name", "hoojo");
    user.put("age", 24);
    
    //JSON 对象转换        
    print("serialize: " + JSON.serialize(user));
    //反序列化
    print("parse: " + JSON.parse("{ \"name\" : \"hoojo\" , \"age\" : 24}"));
    
    print("判断temp Collection是否存在: " + db.collectionExists("temp"));
    
    //如果不存在就创建
    if (!db.collectionExists("temp")) {
        DBObject options = new BasicDBObject();
        options.put("size", 20);
        options.put("capped", 20);
        options.put("max", 20);
        print(db.createCollection("account", options));
    }
    
    //设置db为只读
    db.setReadOnly(true);
    
    //只读不能写入数据
    db.getCollection("test").save(user);
}

转自：http://www.cnblogs.com/hoojo/archive/2011/06/02/2068665.html