Java顺序读取Json文件、顺序读取Properties文件

最新推荐文章于 2023-12-01 14:03:27 发布

原创最新推荐文章于 2023-12-01 14:03:27 发布 · 315 阅读

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#java

该代码展示了如何使用Java处理Json和Properties文件。首先，从文件读取Json字符串并将其转化为Map，然后保存到数据库。接着，重写了Properties类以保持键的顺序，并加载Properties文件到LinkedHashMap中。最后，将Properties内容保存到数据库并返回键的数量。

Json

public int  add(String name) throws IOException {
    String jsonStr = new String(Files.readAllBytes(Paths.get("/Users/zhangcheng/Downloads/"+name)));
    Map<String, String> map = new HashMap<>();
    JSONObject respJson = JSONObject.parseObject(jsonStr, Feature.OrderedField);
    for (Map.Entry<String, Object> entry : respJson.entrySet()) {
        JsonOne jsonOne = new JsonOne();
        String key = entry.getKey();
        Object value = entry.getValue();
        jsonOne.setKeyName(key);
        jsonOne.setValueName((String) value);
        jsonOneService.save(jsonOne);
        map.put(key, String.valueOf(value));
    }
    return map.size();
}

Properties

由于Properties本身的构造方法会改变文件属性位置，所以我们需要重写Properties类重写类如下：OrderedProperties

public class OrderedProperties extends Properties {



    private static final long serialVersionUID = -4627607243846121965L;



    private final LinkedHashSet<Object> keys = new LinkedHashSet<Object>();



    public Enumeration<Object> keys() {

        return Collections.<Object> enumeration(keys);

    }



    public Object put(Object key, Object value) {

        keys.add(key);

        return super.put(key, value);

    }



    public Set<Object> keySet() {

        return keys;

    }



    public Set<String> stringPropertyNames() {

        Set<String> set = new LinkedHashSet<String>();



        for (Object key : this.keys) {

            set.add((String) key);

        }



        return set;

    }

}

然后实现如下：

@GetMapping("/properties")
public int addx(String name) throws IOException {
    Properties props = new OrderedProperties();
    props.load(new FileReader("/Users/zhangcheng/Downloads/"+name));
    // 将properties转换为LinkedHashMap
    Map<String, String> data = new LinkedHashMap<>();
    for (String key : props.stringPropertyNames()) {
        JsonOne jsonOne = new JsonOne();
        String value = props.getProperty(key);
        jsonOne.setKeyName(key);
        jsonOne.setValueName(value);
        jsonOneService.save(jsonOne);
        data.put(key, props.getProperty(key));
    }
    return data.size();
}