Question

我有一个jsp文件，我在其中加载属性文件中存在的现有值。当用户编辑现有值并提交表单时，必须使用该值更新属性文件。谁能帮我这个？我只使用java。

Answer 1

FileInputStream in = new FileInputStream("Example.properties");
Properties props = new Properties();
props.load(in);

现在更新

FileOutputStream outputStream = new FileOutputStream("Example.properties");
props.setProperty("valueTobeUpdate", "new Value");
props.store(outputStream , null);
outputStream .close();

另一种实现相同目的的方法在

中解释

http://crunchify.com/java-properties-files-how-to-update-config-properties-file-in-java/

Answer 2

以下是如何更新属性文件的示例：

public class PropertyManager {
    private static Properties prop = new Properties();
    private static String PROPERTY_FILENAME = "config.properties";

    public static void main(String[] args) {
        loadProperty();
        System.out.println(prop.get("myProperty"));
        updateProperty("myProperty", "aSecondValue");
    }

    public static void loadProperty(){

        InputStream input = null;

        try {

            input = new FileInputStream(PROPERTY_FILENAME);
            // load a properties file
            prop.load(input);

        } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            if (input != null) {
                try {
                    input.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public static void updateProperty(String name, String value){
        OutputStream output = null;

        try {

            output = new FileOutputStream(PROPERTY_FILENAME);

            // set the properties value
            prop.setProperty(name, value);

            // save properties to project root folder
            prop.store(output, null);

        } catch (IOException io) {
            io.printStackTrace();
        } finally {
            if (output != null) {
                try {
                    output.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        }
    }

我允许您通过检索它来更改“新属性”。

Answer 3

PropertiesConfiguration config = new PropertiesConfiguration("/Users/abc/Documents/config.properties");
        config.setProperty("Name", "abcd");
        config.setProperty("Email", "abcd@gmail.com");
        config.setProperty("Phone", "123456");
        config.save();

使用表单值更新属性文件值

3 个答案: