Question

目前我正在实现一个Java servlet Web应用程序。在html页面上，用户可以找到很多URL链接。

我想将带有时间的点击日志，用户的帐户名称和点击的URL记录到服务器上的特定文本文件中。

我想知道如何将文本写入服务器上的文本文件。

Answer 1

您必须使用log4j read more

在java中使用日志记录

如果单击任何链接，则传递一些将在服务器端标识链接的参数，假设当您单击链接时，它将转到您的servlet，然后获取该链接的参数并将其记录在文件中。

Answer 2

这是一个完整的例子：

href servlet：

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;

import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;


public class Log4JServlet extends HttpServlet {
    static Logger log = Logger.getLogger(Log4JServlet.class);

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String url = request.getParameter("url");
        response.setContentType("text/html");

        log.info("info message " + url);
    }

    public void init(ServletConfig config) throws ServletException {
        System.out.println("Log4JInitServlet is initializing log4j");
        String log4jLocation = config.getInitParameter("log4j-properties-location");

        ServletContext sc = config.getServletContext();

        if (log4jLocation == null) {
            System.err.println("*** No log4j-properties-location init param, so initializing log4j with BasicConfigurator");
            BasicConfigurator.configure();
        } else {
            String webAppPath = sc.getRealPath("/");
            String log4jProp = webAppPath + log4jLocation;
            File logFile = new File(log4jProp);
            if (logFile.exists()) {
                System.out.println("Initializing log4j with: " + log4jProp);
                PropertyConfigurator.configure(log4jProp);
            } else {
                System.err.println("*** " + log4jProp + " file not found, so initializing log4j with BasicConfigurator");
                BasicConfigurator.configure();
            }
        }
        super.init(config);
    }
}

然后是web.xml

    <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <servlet>
        <servlet-name>Log4JServlet</servlet-name>
        <servlet-class>Log4JServlet</servlet-class>
        <init-param>
            <param-name>log4j-properties-location</param-name>
            <param-value>WEB-INF/log4j.properties</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>Log4JServlet</servlet-name>
        <url-pattern>/app/*</url-pattern>
    </servlet-mapping>
</web-app>

log4j.property文件：

# Set the root logger to DEBUG.
log4j.rootLogger=INFO,MonitorAppender

# MonitorLog - used to log messages in the Monitor.log file.
log4j.appender.MonitorAppender=org.apache.log4j.FileAppender
log4j.appender.MonitorAppender.File=${catalina.base}/logs/MonitorLog.log
log4j.appender.MonitorAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.MonitorAppender.layout.ConversionPattern= %-4r [%t] %-5p %c %x - %m%n

index.html示例：

<html>
<head>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

    <title>Link reporter</title>
</head>
<body>
<script>
    $("body").delegate("a", "click", function (event) {
        var url = $(this).attr('href');
        reportUrl(url);
        //remove the line below, I just used it so it would be easier to debug
        event.preventDefault();
    });

    function reportUrl(url) {
        $.get("/app/Log4JServlet", { url: url});
    }

</script>

<a href="test.html">test1</a>
<a href="test2.html">test2</a>
<a href="test3.html">test3</a>

</body>
</html>

基本上，点击index.html的任何链接都将报告给servlet，并将href存储到tomcat logs文件夹中的MonitorLog.log文件中。

我希望有帮助

Answer 3

当你们没有必要时，你们使用第三方库等过于复杂了！

这里有一些示例代码我用于类似的东西，它将所有请求记录到某个目录到数据库，主要是为了跟踪哪些文件很受欢迎，但你当然可以切换这个到flatfile日志记录

我的代码：

package com.zack6849.website.filters;

import com.zack6849.website.Database;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;

@WebFilter(urlPatterns = "/uploads/*")
public class StatisticsFilter implements Filter {

    @Override
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        chain.doFilter(req, resp);
        System.out.printf("[STATS] request to %s", request.getRequestURI());
        if (request.getRequestURI() != null) {
            Database database = new Database();
            try {
                ResultSet count = database.query("SELECT COUNT (url) as results FROM requests WHERE url = ?", request.getRequestURI());
                boolean exists = count.getInt("results") > 0;
                count.close();
                if (!exists) {
                    database.executeUpdate("INSERT INTO requests (url, hits) VALUES (?, ?)", request.getRequestURI(), 0);
                }
                System.out.printf("[STATS] INCREMENTING 'hits' FOR %s", request.getRequestURI());
                database.executeUpdate("UPDATE requests SET hits = hits + 1  WHERE url = ?", request.getRequestURI());
                database.closeConnection();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void destroy() {

    }

}

旧的servlet引擎可能要求您在web.xml中为此指定一个过滤器，它看起来应该是这样的

<filter>
    <filter-name>logging</filter-name>
    <filter-class>com.zack6849.website.filters.StatisticsFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>logging</filter-name>
    <url-pattern>/uploads/*</url-pattern>
</filter-mapping>

如何将html链接点击记录到文本文件中

3 个答案: