1.1. 对properties配置文件的读取
1.1.1. 要读取的文件
配置文件key和value之间用冒号[:]和等于号[=]都是可以的.
Test.properties |
name:\u5F20\u4E09 password:\u5BC6\u7801 age:22 |
1.1.2. 读取的程序代码
PropertiesTest.java |
/** * 读取配置文件 * @throws IOException */ @Test public void read() throws IOException{ Properties properties = new Properties(); File file = new File("test.properties"); FileInputStream fis = new FileInputStream(file); properties.load(fis); Set<Object> keySet = properties.keySet(); for (Object object : keySet) { System.out.println(object.toString()+":"+properties.getProperty(object.toString())); } } |
1.1.3. 结果
后台打印结果 |
age:22 password:密码 name:张三 |
1.2. 对propertiest配置文件的写入操作
1.2.1. 写入程序的代码
PropertiesTest.java |
/** * 向配置文件写入内容 * @throws IOException */ @Test public void write() throws IOException { Properties properties = new Properties(); String file = "aa.properties"; FileOutputStream fos = new FileOutputStream(file); properties.setProperty("aa", "123"); properties.setProperty("bb", "456"); properties.setProperty("cc", "789"); properties.setProperty("name", "张三"); properties.store(fos, "保存文件"); fos.close(); } |
1.2.2. 结果
aa.propertiest |
#\u4FDD\u5B58\u6587\u4EF6 #Sun Jan 25 14:06:25 CST 2015 name=\u5F20\u4E09 aa=123 bb=456 cc=789 |
1.3. 对properties配置文件的修改操作
1.3.1. 修改前的配置文件
Test.properties |
Age=22 Password=密码 Name=张三 |
1.3.2. 修改程序的代码
PropertiesTest.java |
/** * 对配置文件的修改 * @throws IOException */ @Test public void update() throws IOException{ Properties properties = new Properties(); File file = new File("test.properties"); FileInputStream fis = new FileInputStream(file); FileOutputStream fos = new FileOutputStream(file); properties.load(fis); properties.setProperty("name", "李四"); properties.setProperty("age", "222"); properties.setProperty("age3", "222"); properties.store(fos, "更新配置文件"); fos.close(); fis.close(); } |
1.3.3. 修改后的文件内容
Test.properties |
#\u66F4\u65B0\u914D\u7F6E\u6587\u4EF6 #Sun Jan 25 15:20:40 CST 2015 age=222 name=\u674E\u56DB password=\u5BC6\u7801 age3=222 |
1.4. 对properties配置文件的删除
1.4.1. 删除前配置文件的内容
Test.properties |
#\u66F4\u65B0\u914D\u7F6E\u6587\u4EF6 #Sun Jan 25 15:20:40 CST 2015 age=222 name=\u674E\u56DB password=\u5BC6\u7801 age3=222 |
1.4.2. 删除程序的代码
PropertiesTest.java |
/** * 删除配置文件中的key * @throws IOException * */ @Test public void delete() throws IOException{ Properties properties = new Properties(); File file = new File("test.properties"); FileInputStream fis = new FileInputStream(file); properties.load(fis); //必须先用map将所有的内容先保存,不然一删除,原来的内容都没了 Map<String, String> map = new HashMap<String, String>(); Set<Object> keySet = properties.keySet(); System.out.println(keySet.size()); for (Object object : keySet) { String key = (String) object; String value = (String) properties.get(key); System.out.println(key+"="+value); map.put(key, value); } //删除key map.remove("age3"); properties.remove("age3"); for (java.util.Map.Entry<String, String> entry: map.entrySet()) { properties.setProperty(entry.getKey(), entry.getValue()); } FileOutputStream fos = new FileOutputStream(file); properties.store(fos, "删除配置文件中的key:age3"); fos.close(); fis.close(); } |
1.4.3. 删除后的配置文件内容
Test.properties |
#\u5220\u9664\u914D\u7F6E\u6587\u4EF6\u4E2D\u7684key:age3 #Sun Jan 25 15:23:58 CST 2015 age=222 name=\u674E\u56DB password=\u5BC6\u7801 |
1.5. 完整程序代码
PropertieTest.java |
import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.HashMap; import java.util.Map; import java.util.Properties; import java.util.Set; import org.junit.Test; public class PropertiesTest { public static void main(String[] args) { } /** * 删除配置文件中的key * @throws IOException * */ @Test public void delete() throws IOException{ Properties properties = new Properties(); File file = new File("test.properties"); FileInputStream fis = new FileInputStream(file); properties.load(fis); //必须先用map将所有的内容先保存,不然一删除,原来的内容都没了 Map<String, String> map = new HashMap<String, String>(); Set<Object> keySet = properties.keySet(); System.out.println(keySet.size()); for (Object object : keySet) { String key = (String) object; String value = (String) properties.get(key); System.out.println(key+"="+value); map.put(key, value); } //删除key map.remove("age3"); properties.remove("age3"); for (java.util.Map.Entry<String, String> entry: map.entrySet()) { properties.setProperty(entry.getKey(), entry.getValue()); } FileOutputStream fos = new FileOutputStream(file); properties.store(fos, "删除配置文件中的key:age3"); fos.close(); fis.close(); } /** * 对配置文件的修改 * @throws IOException */ @Test public void update() throws IOException{ Properties properties = new Properties(); File file = new File("test.properties"); FileInputStream fis = new FileInputStream(file); properties.load(fis); //必须先用map将所有的内容先保存,不然一更新,原来的内容都没了 Map<String, String> map = new HashMap<String, String>(); Set<Object> keySet = properties.keySet(); System.out.println(keySet.size()); for (Object object : keySet) { String key = (String) object; String value = (String) properties.get(key); System.out.println(key+"="+value); map.put(key, value); } map.put("name", "李四"); map.put("age", "222"); map.put("age3", "222"); for (java.util.Map.Entry<String, String> entry: map.entrySet()) { properties.setProperty(entry.getKey(), entry.getValue()); } FileOutputStream fos = new FileOutputStream(file); properties.store(fos, "更新配置文件"); fos.close(); fis.close(); } /** * 向配置文件写入内容 * @throws IOException */ @Test public void write() throws IOException { Properties properties = new Properties(); String file = "aa.properties"; FileOutputStream fos = new FileOutputStream(file); properties.setProperty("aa", "123"); properties.setProperty("bb", "456"); properties.setProperty("cc", "789"); properties.setProperty("name", "张三"); properties.store(fos, "保存文件"); fos.close(); } /** * 读取配置文件 * @throws IOException */ @Test public void read() throws IOException{ Properties properties = new Properties(); File file = new File("test.properties"); FileInputStream fis = new FileInputStream(file); properties.load(fis); Set<Object> keySet = properties.keySet(); for (Object object : keySet) { System.out.println(object.toString()+"="+properties.getProperty(object.toString())); } } } |
时间: 2024-11-05 18:53:22