配置文件key和value之间用冒号[:]和等于号[=]都是可以的.
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Test.properties |
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name:\u5F20\u4E09 password:\u5BC6\u7801 age:22 |
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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()));
}
} |
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后台打印结果 |
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age:22 password:密码 name:张三 |
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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();
} |
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aa.propertiest |
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#\u4FDD\u5B58\u6587\u4EF6 #Sun Jan 25 14:06:25 CST 2015 name=\u5F20\u4E09 aa=123 bb=456 cc=789 |
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Test.properties |
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Age=22 Password=密码 Name=张三 |
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PropertiesTest.java |
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/**
* 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();
} |
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Test.properties |
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#\u66F4\u65B0\u914D\u7F6E\u6587\u4EF6 #Sun Jan 25 15:20:40 CST 2015 age=222 name=\u674E\u56DB password=\u5BC6\u7801 age3=222 |
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Test.properties |
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#\u66F4\u65B0\u914D\u7F6E\u6587\u4EF6 #Sun Jan 25 15:20:40 CST 2015 age=222 name=\u674E\u56DB password=\u5BC6\u7801 age3=222 |
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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();
} |
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Test.properties |
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#\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 |
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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()));
}
}
}
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原文:http://blog.csdn.net/u022812849/article/details/43114889