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「Tomcat」ファイル読み込みいろいろ

Tomcat
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Tomcat」ファイル読み込みいろいろ

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Tomcat でファイル読み込みやってみました。その時のメモ。

[ 環境情報 ]
CentOS 6.2
Apache Tomcat 6.0.32
Java SE 6 Update 34


■ テキストファイルの読み込みサンプル ( WEB-INF/file/test.txt の読み込み )

package read.file;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ReadFileServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public ReadFileServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		ServletContext context = getServletContext();
		String path = context.getRealPath("WEB-INF/file/test.txt");

		BufferedReader br = new BufferedReader(new FileReader(path));
		StringBuffer sb = new StringBuffer();
		String line = null;
		while ((line = br.readLine()) != null) {
			sb.append(line);
			sb.append("<br>");
		}
		br.close();

		PrintWriter out = response.getWriter();
		out.println("<html>");
		out.println("<body>");
		out.println(sb.toString());
		out.println("</body>");
		out.println("</html>");
	}
}


■ プロパティファイルの読み込みサンプル
( パッケージ read.prop 内の test1.properties、および、WEB-INF/prop/test2.properties の読み込み )

package read.prop;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Properties;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ReadPropServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public ReadPropServlet() {
		super();
	}
	
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		InputStream is1 = ReadPropServlet.class.getClassLoader()
				.getResourceAsStream("read/prop/test1.properties");
		Properties prop1 = new Properties();
		prop1.load(is1);

		InputStream is2 = getServletContext().getResourceAsStream(
				"WEB-INF/prop/test2.properties");
		Properties prop2 = new Properties();
		prop2.load(is2);

		is1.close();
		is2.close();

		PrintWriter out = response.getWriter();
		out.println("<html>");
		out.println("<body>");

		out.println("***** read/prop/test1.properties *****");
		out.println("<br>");
		out.println("key1 : " + prop1.getProperty("key1"));
		out.println("<br>");
		out.println("key2 : " + prop1.getProperty("key2"));
		out.println("<br>");
		out.println("key3 : " + prop1.getProperty("key3"));
		out.println("<br>");

		out.println("***** read/prop/test2.properties *****");
		out.println("<br>");
		out.println("key4 : " + prop2.getProperty("key4"));
		out.println("<br>");
		out.println("key5 : " + prop2.getProperty("key5"));
		out.println("<br>");
		out.println("key6 : " + prop2.getProperty("key6"));
		out.println("<br>");

		out.println("</body>");
		out.println("</html>");
	}
}

test1.properties

key1=value1
key2=value2
key3=value3

test2.properties

key4=value4
key5=value5
key6=value6

以上です。

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