<?php

class Test{

    //日志路径

    const LOG_PATH="E:\phpServer\Apache\logs\\error.log";

    //显示的行数

    const PAGES=50;

    public static function main(){

        header("content-type:text/html;charset=utf-8");

        if(!empty($_GET['action'])){

            if(!method_exists('Test',$_GET['action'])){

                echo "404";

            }else{

                self::$_GET['action']();

            }

            exit;

        }

    }

    public static function showApacheLogs(){

        $test=new Test();

        $result=$test->readLogs(self::LOG_PATH,self::PAGES);

        $json=array();

        for($i=0;$i<count($result);$i++){

            $line=$result[$i];

            //注意这里，如果处理会json解析失败

            $line=str_replace("\r\n", "", $line);

            $result[$i]=array("num"=>$i+1,"msg"=>urlencode($line));

        }

        $str=stripslashes(urldecode(json_encode($result)));

        echo $str;

    }

    /**

    * 读取日志

    */

    private function readLogs($filePath,$num=20){

        $fp = fopen($filePath,"r");

        $pos = -2;

        $eof = "";

        $head = false;   //当总行数小于Num时，判断是否到第一行了

        $lines = array();

        while($num>0){

            while($eof != "\n"){

                if(fseek($fp, $pos, SEEK_END)==0){    //fseek成功返回0，失败返回-1

                    $eof = fgetc($fp);

                    $pos--;

                }else{                               //当到达第一行，行首时，设置$pos失败

                    fseek($fp,0,SEEK_SET);

                    $head = true;                   //到达文件头部，开关打开

                    break;

                }  

            }

            array_unshift($lines,fgets($fp));

            if($head){ break; }                 //这一句，只能放上一句后，因为到文件头后，把第一行读取出来再跳出整个循环

            $eof = "";

            $num--;

        }

        fclose($fp);

        return array_reverse($lines);

    }

}

Test::main();

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import org.json.JSONArray;

import org.json.JSONObject;

public class ReadLogs {

    public static void main(String[] args) throws Exception {

        URL url = new URL("http://localhost/test.php?action=showApacheLogs");

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();

        conn.setConnectTimeout(10000);

        conn.setRequestMethod("GET");

        conn.setDoInput(true);

        conn.setDoOutput(true);

        // 输出返回结果

        InputStream input = conn.getInputStream();

        int resLen =0;

        byte[] res = new byte[1024];

        StringBuilder sb=new StringBuilder();

        while((resLen=input.read(res))!=-1){

            sb.append(new String(res, 0, resLen));

        }

        String jsonStr=sb.toString();

        //String转换成JSON

        JSONArray jsonArray=new JSONArray(jsonStr);

        for(int i=0;i<jsonArray.length();i++){

            JSONObject jsonObject=new JSONObject(jsonArray.getString(i));

            String msg=(String) jsonObject.get("msg");

            int num=(int) jsonObject.get("num");

            System.out.println(num+":"+msg);

        }

    }

}