<?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);
    }
  }
}