property在Java中的用法 java中property的属性问题
java\u7f16\u7a0b\u4e2dProperties\u7c7b\u7684\u5177\u4f53\u4f5c\u7528\u548c\u4f7f\u7528\uff01\u5982\u679c\u4e0d\u719f\u6089 java.util.Properties\u7c7b\uff0c\u90a3\u4e48\u73b0\u5728\u544a\u8bc9\u60a8\u5b83\u662f\u7528\u6765\u5728\u4e00\u4e2a\u6587\u4ef6\u4e2d\u5b58\u50a8\u952e-\u503c\u5bf9\u7684\uff0c\u5176\u4e2d\u952e\u548c\u503c\u662f\u7528\u7b49\u53f7\u5206\u9694\u7684\u3002\uff08\u5982\u6e05\u5355 1 \u6240\u793a\uff09\u3002\u6700\u8fd1\u66f4\u65b0\u7684java.util.Properties \u7c7b\u73b0\u5728\u63d0\u4f9b\u4e86\u4e00\u79cd\u4e3a\u7a0b\u5e8f\u88c5\u8f7d\u548c\u5b58\u50a8\u8bbe\u7f6e\u7684\u66f4\u5bb9\u6613\u7684\u65b9\u6cd5\uff1a loadFromXML(InputStreamis) \u548c storeToXML(OutputStream os, String comment) \u65b9\u6cd5\u3002
\u4e00\u4e0b\u662f\u8be6\u7ec6\u7684\u8bf4\u660e\uff0c\u5e0c\u671b\u80fd\u7ed9\u5927\u5bb6\u5e26\u6765\u5e2e\u52a9\u3002
\u6e05\u5355 1. \u4e00\u7ec4\u5c5e\u6027\u793a\u4f8b
foo=bar
fu=baz
\u5c06\u6e05\u5355 1 \u88c5\u8f7d\u5230 Properties \u5bf9\u8c61\u4e2d\u540e\uff0c\u60a8\u5c31\u53ef\u4ee5\u627e\u5230\u4e24\u4e2a\u952e\uff08 foo \u548c fu \uff09\u548c\u4e24\u4e2a\u503c\uff08 foo \u7684 bar \u548c fu \u7684baz \uff09\u4e86\u3002\u8fd9\u4e2a\u7c7b\u652f\u6301\u5e26 \u \u7684\u5d4c\u5165 Unicode \u5b57\u7b26\u4e32\uff0c\u4f46\u662f\u8fd9\u91cc\u91cd\u8981\u7684\u662f\u6bcf\u4e00\u9879\u5185\u5bb9\u90fd\u5f53\u4f5c String \u3002
\u6e05\u53552 \u663e\u793a\u4e86\u5982\u4f55\u88c5\u8f7d\u5c5e\u6027\u6587\u4ef6\u5e76\u5217\u51fa\u5b83\u5f53\u524d\u7684\u4e00\u7ec4\u952e\u548c\u503c\u3002\u53ea\u9700\u4f20\u9012\u8fd9\u4e2a\u6587\u4ef6\u7684 InputStream \u7ed9 load()\u65b9\u6cd5\uff0c\u5c31\u4f1a\u5c06\u6bcf\u4e00\u4e2a\u952e-\u503c\u5bf9\u6dfb\u52a0\u5230 Properties \u5b9e\u4f8b\u4e2d\u3002\u7136\u540e\u7528 list() \u5217\u51fa\u6240\u6709\u5c5e\u6027\u6216\u8005\u7528 getProperty()\u83b7\u53d6\u5355\u72ec\u7684\u5c5e\u6027\u3002
\u6e05\u5355 2. \u88c5\u8f7d\u5c5e\u6027
import java.util.*;
import java.io.*;
public class LoadSample {
public static void main(String args[]) throws Exception {
Properties prop = new Properties();
FileInputStream fis =
new FileInputStream("sample.properties");
prop.load(fis);
prop.list(System.out);
System.out.println("\nThe foo property: " +
prop.getProperty("foo"));
}
}
\u8fd0\u884c LoadSample \u7a0b\u5e8f\u751f\u6210\u5982\u6e05\u5355 3 \u6240\u793a\u7684\u8f93\u51fa\u3002\u6ce8\u610f list() \u65b9\u6cd5\u7684\u8f93\u51fa\u4e2d\u952e-\u503c\u5bf9\u7684\u987a\u5e8f\u4e0e\u5b83\u4eec\u5728\u8f93\u5165\u6587\u4ef6\u4e2d\u7684\u987a\u5e8f\u4e0d\u4e00\u6837\u3002Properties \u7c7b\u5728\u4e00\u4e2a\u6563\u5217\u8868\uff08hashtable\uff0c\u4e8b\u5b9e\u4e0a\u662f\u4e00\u4e2a Hashtable \u5b50\u7c7b\uff09\u4e2d\u50a8\u5b58\u4e00\u7ec4\u952e-\u503c\u5bf9\uff0c\u6240\u4ee5\u4e0d\u80fd\u4fdd\u8bc1\u987a\u5e8f\u3002
\u6e05\u5355 3. LoadSample \u7684\u8f93\u51fa
-- listing properties --
fu=baz
foo=bar
The foo property: bar
XML \u5c5e\u6027\u6587\u4ef6
\u8fd9\u91cc\u6ca1\u6709\u4ec0\u4e48\u65b0\u5185\u5bb9\u3002 Properties \u7c7b\u603b\u662f\u8fd9\u6837\u5de5\u4f5c\u7684\u3002\u4e0d\u8fc7\uff0c\u65b0\u7684\u5730\u65b9\u662f\u4ece\u4e00\u4e2a XML \u6587\u4ef6\u4e2d\u88c5\u8f7d\u4e00\u7ec4\u5c5e\u6027\u3002\u5b83\u7684 DTD \u5982\u6e05\u5355 4 \u6240\u793a\u3002
\u6e05\u5355 4. \u5c5e\u6027 DTD
\u5982\u679c\u4e0d\u60f3\u7ec6\u8bfb XML DTD\uff0c\u90a3\u4e48\u53ef\u4ee5\u544a\u8bc9\u60a8\u5b83\u5176\u5b9e\u5c31\u662f\u8bf4\u5728\u5916\u56f4 \u6807\u7b7e\u4e2d\u5305\u88c5\u7684\u662f\u4e00\u4e2a \u6807\u7b7e\uff0c\u540e\u9762\u662f\u4efb\u610f\u6570\u91cf\u7684 \u6807\u7b7e\u3002\u5bf9\u6bcf\u4e00\u4e2a \u6807\u7b7e\uff0c\u6709\u4e00\u4e2a\u952e\u5c5e\u6027\uff0c\u8f93\u5165\u7684\u5185\u5bb9\u5c31\u662f\u5b83\u7684\u503c\u3002\u6e05\u5355 5 \u663e\u793a\u4e86 \u6e05\u5355 1\u4e2d\u7684\u5c5e\u6027\u6587\u4ef6\u7684 XML \u7248\u672c\u662f\u4ec0\u4e48\u6837\u5b50\u7684\u3002
\u6e05\u5355 5. XML \u7248\u672c\u7684\u5c5e\u6027\u6587\u4ef6
Hi
bar
baz
\u5982\u679c\u6e05\u5355 6 \u6240\u793a\uff0c\u8bfb\u53d6 XML \u7248\u672c\u7684 Properties \u6587\u4ef6\u4e0e\u8bfb\u53d6\u8001\u683c\u5f0f\u7684\u6587\u4ef6\u6ca1\u4ec0\u4e48\u4e0d\u540c\u3002
\u6e05\u5355 6. \u8bfb\u53d6 XML Properties \u6587\u4ef6
import java.util.*;
import java.io.*;
public class LoadSampleXML {
public static void main(String args[]) throws Exception {
Properties prop = new Properties();
FileInputStream fis =
new FileInputStream("sampleprops.xml");
prop.loadFromXML(fis);
prop.list(System.out);
System.out.println("\nThe foo property: " +
prop.getProperty("foo"));
}
}
\u5173\u4e8e\u8d44\u6e90\u7ed1\u5b9a\u7684\u8bf4\u660e
\u867d\u7136 java.util.Properties \u7c7b\u73b0\u5728\u9664\u4e86\u652f\u6301\u952e-\u503c\u5bf9\uff0c\u8fd8\u652f\u6301\u5c5e\u6027\u6587\u4ef6\u4f5c\u4e3a XML \u6587\u4ef6\uff0c\u4e0d\u5e78\u7684\u662f\uff0c\u6ca1\u6709\u5185\u7f6e\u7684\u9009\u9879\u53ef\u4ee5\u5c06ResourceBundle \u4f5c\u4e3a\u4e00\u4e2a XML \u6587\u4ef6\u5904\u7406\u3002\u662f\u7684\uff0c PropertyResourceBundle \u4e0d\u4f7f\u7528 Properties\u5bf9\u8c61\u6765\u88c5\u8f7d\u7ed1\u5b9a\uff0c\u4e0d\u8fc7\u88c5\u8f7d\u65b9\u6cd5\u7684\u4f7f\u7528\u662f\u786c\u7f16\u7801\u5230\u7c7b\u4e2d\u7684\uff0c\u800c\u4e0d\u4f7f\u7528\u8f83\u65b0\u7684 loadFromXML() \u65b9\u6cd5\u3002
\u8fd0\u884c\u6e05\u5355 6 \u4e2d\u7684\u7a0b\u5e8f\u4ea7\u751f\u4e0e\u539f\u6765\u7684\u7a0b\u5e8f\u76f8\u540c\u7684\u8f93\u51fa\uff0c\u5982 \u6e05\u5355 2\u6240\u793a\u3002
\u4fdd\u5b58 XML \u5c5e\u6027
\u65b0\u7684 Properties \u8fd8\u6709\u4e00\u4e2a\u529f\u80fd\u662f\u5c06\u5c5e\u6027\u5b58\u50a8\u5230 XML \u683c\u5f0f\u7684\u6587\u4ef6\u4e2d\u3002\u867d\u7136 store() \u65b9\u6cd5\u4ecd\u7136\u4f1a\u521b\u5efa\u4e00\u4e2a\u7c7b\u4f3c \u6e05\u5355 1\u6240\u793a\u7684\u6587\u4ef6\uff0c\u4f46\u662f\u73b0\u5728\u53ef\u4ee5\u7528\u65b0\u7684 storeToXML() \u65b9\u6cd5\u521b\u5efa\u5982 \u6e05\u5355 5 \u6240\u793a\u7684\u6587\u4ef6\u3002\u53ea\u8981\u4f20\u9012\u4e00\u4e2a OutputStream\u548c\u4e00\u4e2a\u7528\u4e8e\u6ce8\u91ca\u7684 String \u5c31\u53ef\u4ee5\u4e86\u3002\u6e05\u5355 7 \u5c55\u793a\u4e86\u65b0\u7684 storeToXML() \u65b9\u6cd5\u3002
\u6e05\u5355 7. \u5c06 Properties \u5b58\u50a8\u4e3a XML \u6587\u4ef6
import java.util.*;
import java.io.*;
public class StoreXML {
public static void main(String args[]) throws Exception {
Properties prop = new Properties();
prop.setProperty("one-two", "buckle my shoe");
prop.setProperty("three-four", "shut the door");
prop.setProperty("five-six", "pick up sticks");
prop.setProperty("seven-eight", "lay them straight");
prop.setProperty("nine-ten", "a big, fat hen");
FileOutputStream fos =
new FileOutputStream("rhyme.xml");
prop.storeToXML(fos, "Rhyme");
fos.close();
}
}
\u8fd0\u884c\u6e05\u5355 7 \u4e2d\u7684\u7a0b\u5e8f\u4ea7\u751f\u7684\u8f93\u51fa\u5982\u6e05\u5355 8 \u6240\u793a\u3002
\u6e05\u5355 8. \u5b58\u50a8\u7684 XML \u6587\u4ef6
Rhyme
lay them straight
pick up sticks
a big, fat hen
shut the door
buckle my shoe
\u5728\u8fd9\u91cc\u6539\u4e86\u4e00\u4e2a\u4f8b\u5b50\uff1a
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
/**
* \u5b9e\u73b0properties\u6587\u4ef6\u7684\u8bfb\u53d6
* @author haoxuewu
*/
public class Test {
public static void main(String[] args) {
try {
long start = System.currentTimeMillis();
InputStream is = new FileInputStream("conf.properties");
Properties p = new Properties();
p.load(is);
is.close();
System.out.println("SIZE : " + p.size());
System.out.println("homepage : " + p.getProperty("homepage"));
System.out.println("author : " + p.getProperty("author"));
System.out.println("school : " + p.getProperty("school"));
long end = System.currentTimeMillis();
System.out.println("Cost : " + (end - start));
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
conf.properties
# Configuration file
homepage = http://www.blogjava.net/haoxuewu
author = bbflyerwww
school = jilinjianzhugongchengxueyuan
Result
SIZE:3
homepage : http://www.blogjava.net/haoxuewu
author : bbflyerwww
school : jilinjianzhugongchengxueyuan
\u4f60\u7528<s:textfiled \u8bbe\u7f6e\u4e0breadonly\uff0c\u53d8\u6210\u53ea\u8bfb\uff0c\u4e0d\u8ba9\u66f4\u6539\u5c31\u884c\u4e86\uff0c\u8bbe\u7f6e\u4e2aname\u673a\u5b50\u5c31\u4f20\u4e86\uff1b
\u8981\u4e0d\u5c31\u7528\u8f93\u51fa \uff0c\u5728\u7528\u4e00\u4e2a\u8bb0\u5f55\u4e0b\u5c31\u884c\u4e86\uff1b
1． getProperty ( String key) ， 用指定的键在此属性列表中搜索属性。也就是通过参数 key ，得到 key 所对应的 value。
2． load ( InputStream inStream) ，从输入流中读取属性列表（键和元素对）。通过对指定的文件（比如说上面的 test.properties 文件）进行装载来获取该文件中的所有键 - 值对。以供 getProperty ( String key) 来搜索。
3． setProperty ( String key, String value) ，调用 Hashtable 的方法 put 。他通过调用基类的put方法来设置 键 - 值对。
4． store ( OutputStream out, String comments) ， 以适合使用 load 方法加载到 Properties 表中的格式，将此 Properties 表中的属性列表（键和元素对）写入输出流。与 load 方法相反，该方法将键 - 值对写入到指定的文件中去。
5． clear () ，清除所有装载的 键 - 值对。该方法在基类中提供。
在项目中经常用到各种配置文件，有.properties的，也有.xml格式的
都可以通过java.utils.Property类进行处理。
1. 读取.properties文件
File pFile = new File("test.properties");
FileInputStream pInStream=null;
try {
pInStream = new FileInputStream(pFile );
} catch (FileNotFoundException e) {
e.printStackTrace();
}
Properties p = new Properties();
try {
p.load(pInStream );
} catch (IOException e) {
e.printStackTrace();
}
Enumeration enu = p.propertyNames(); //取出所有的key
p.list(System.out) ;
while(enu.hasMoreElements())
{
String thisKey = (String)enu.nextElement();
System.out.println("key="+thisKey);
System.out.println("value="+p.getProperty(thisKey));
}.properties测试文件内容如下：
name = tinyfun
age = 25
sex = man
title = software developer
2. 读取XML文件
File pFile = new File("test.xml");
FileInputStream pInStream = null;
try {
pInStream = new FileInputStream(pFile);
Properties p = new Properties();
p.loadFromXML(pInStream);
p.list(System.out);
} catch (IOException e) {
e.printStackTrace();
}xml文件如下：
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
<comment>test</comment>
<entry key="age">25</entry>
<entry key="name">tinyfun</entry>
<entry key="sex">man</entry>
<entry key="title">software developer</entry>
</properties>
3. 写入XML文件
Properties p = new Properties();
p.setProperty("name","tinyfun");
p.setProperty("age","25");
p.setProperty("sex","man");
p.setProperty("title","software developer");
try{
PrintStream fW = new PrintStream(new File("test.xml"));
p.storeToXML(fW,"test");
} catch (IOException e) {
e.printStackTrace();
}
4. 写入.properties文件
Properties p = new Properties();
p.setProperty("name","tinyfun");
p.setProperty("age","25");
p.setProperty("sex","man");
p.setProperty("title","software developer");
try{
PrintStream fW = new PrintStream(new File("test.properties"));
p.list(fW ); }
catch (IOException e) {
e.printStackTrace();
}
http://blog.csdn.net/hopestar2/article/details/6372883
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绛旓細import java.util.Iterator;import java.util.Properties;public class PropertyTest { public static void main(String[] args) { try { // 璇诲彇灞炴ф枃浠禷.properties InputStream in = new BufferedInputStream(new FileInputStream("a.properties"));// /鍔犺浇灞炴у垪琛 Properties prop = new ...
绛旓細import java.util.Properties;public class PropertiesTest { /*瀹氫箟闈欐佹柟娉,绫诲悕鍙互鐩存帴璋冪敤,鐢ㄤ簬璇诲彇properties灞炴ф枃浠涓殑鍐呭*/ public static void initFile(){ /*D://a.properties婧愬睘鎬ф枃浠剁殑璺緞鍜屽悕瀛*/ File file = new File("D://a.properties");FileInputStream fis = null;try { ...
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