Servlet读取文本文件并显示

最新推荐文章于 2024-08-19 15:48:03 发布

风云正

最新推荐文章于 2024-08-19 15:48:03 发布

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分类专栏： web 文章标签： servlet

本文链接：https://blog.youkuaiyun.com/chenzheng8975/article/details/84652184

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本文介绍了一个名为DataServlet的Java Servlet，它用于从文本文件中读取数据，并将其显示在网页上。DataServlet通过GET请求处理数据，解决了中文乱码问题，并在web.xml中进行了配置。

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DataServlet.java:

package com.joyment.servlet;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;

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

/**  
 * @ClassName: DataServlet  
 * @Description: 数据处理并显示
 * @author chenzheng
 * @date 2014-9-12 下午05:43:49  
 */
public class DataServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = -380317075280232904L;

	@Override
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");
		response.setCharacterEncoding("utf-8");
		PrintWriter pw = null;
		//文本文件要放在tomcat下
		String fileName = "share.txt";
		String realPath = request.getSession().getServletContext().getRealPath(fileName);
		System.out.println(realPath);
		try {
			pw = response.getWriter();
		} catch (Exception e) {
			e.printStackTrace();
		}
		try {
			//解决中文乱码
			BufferedReader br = new BufferedReader(new InputStreamReader(
					new FileInputStream(realPath), "UTF-8"));
			String line = null;
			while ((line = br.readLine()) != null) {
				System.out.println(line);
				pw.println(line);
			}
			br.close();
		} catch (FileNotFoundException e) {
		} catch (IOException e) {
		}
		pw.flush();
		pw.close();
	}

	@Override
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		this.doGet(request, response);
	}
}

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>

	<servlet>
		<servlet-name>DataServlet</servlet-name>
		<servlet-class>com.joyment.servlet.DataServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>DataServlet</servlet-name>
		<url-pattern>/DataServlet</url-pattern>
	</servlet-mapping>
</web-app>