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JSP中利用Properties读写配置文件

2014-08-18 09:45 316 查看

JSP中利用Properties读写配置文件

java 代码：

package com.reason.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Properties;

public class Test {

public static void writeProperties(String filePath, String parameterName,
String parameterValue) {
Properties props = new Properties();
try {
File f = new File(filePath);

if (f.exists()) {

InputStream fis = new FileInputStream(filePath);
props.load(fis);
fis.close();

} else {
System.out.println(filePath);
f.createNewFile();
}

OutputStream fos = new FileOutputStream(filePath);
props.setProperty(parameterName, parameterValue);

props.store(fos, "");
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}

public static Properties readProperties(String filePath) {
Properties props = new Properties();
InputStream is;
try {
is = new FileInputStream(filePath);
props.load(is);
is.close();
return props;
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return null;
}

}

public static void main(String[] args) {

Test t = new Test();
t.writeProperties("c:/1.properties", "name", "tom");

}

}
JSP：index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
<form action="writeProperties.jsp">
key :
<input type="text" name="key" />
value :
<input type="text" name="value" />
<input type="submit" value="提交" />
</form>
</body>
</html>

jsp: 功能实现页面

<%@ page language="java" import="java.util.*" pageEncoding="utf8"%>

<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<jsp:useBean id="test" type="com.reason.test.Test" scope="request"
/>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'writeProperties.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

<%
String key = request.getParameter("key");
String value = request.getParameter("value");
String filepath = request.getSession().getServletContext()
.getRealPath("/")
+ "properties1.properties";
test.writeProperties(filepath, key.trim(), value);
Properties props = test.readProperties(filepath);

Enumeration en = props.elements();
while (en.hasMoreElements()) {
String tmpKey = (String) en.nextElement();

String tmpvalue = (String) props.getProperty(tmpKey);
%>
key : <%=tmpKey%>
value: <%=tmpvalue%><br>
<%
}
%>
</head>

<body>

</body>
</html>

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