和安卓是一个道理,读取json数据
PHP文件:
<?<span style="color: #000000;">php </span><span style="color: #0000ff;">class</span><span style="color: #000000;"> Test{ </span><span style="color: #008000;">//</span><span style="color: #008000;">日志路径</span> <span style="color: #0000ff;">const</span> LOG_PATH="E:\phpServer\Apache\logs\\error.log"<span style="color: #000000;">; </span><span style="color: #008000;">//</span><span style="color: #008000;">显示的行数</span> <span style="color: #0000ff;">const</span> PAGES=50<span style="color: #000000;">; </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> main(){ </span><span style="color: #008080;">header</span>("content-type:text/html;charset=utf-8"<span style="color: #000000;">); </span><span style="color: #0000ff;">if</span>(!<span style="color: #0000ff;">empty</span>(<span style="color: #800080;">$_GET</span>['action'<span style="color: #000000;">])){ </span><span style="color: #0000ff;">if</span>(!<span style="color: #008080;">method_exists</span>('Test',<span style="color: #800080;">$_GET</span>['action'<span style="color: #000000;">])){ </span><span style="color: #0000ff;">echo</span> "404"<span style="color: #000000;">; }</span><span style="color: #0000ff;">else</span><span style="color: #000000;">{ self</span>::<span style="color: #800080;">$_GET</span>['action'<span style="color: #000000;">](); } </span><span style="color: #0000ff;">exit</span><span style="color: #000000;">; } } </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> showApacheLogs(){ </span><span style="color: #800080;">$test</span>=<span style="color: #0000ff;">new</span><span style="color: #000000;"> Test(); </span><span style="color: #800080;">$result</span>=<span style="color: #800080;">$test</span>->readLogs(self::LOG_PATH,self::<span style="color: #000000;">PAGES); </span><span style="color: #800080;">$json</span>=<span style="color: #0000ff;">array</span><span style="color: #000000;">(); </span><span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=0;<span style="color: #800080;">$i</span><<span style="color: #008080;">count</span>(<span style="color: #800080;">$result</span>);<span style="color: #800080;">$i</span>++<span style="color: #000000;">){ </span><span style="color: #800080;">$line</span>=<span style="color: #800080;">$result</span>[<span style="color: #800080;">$i</span><span style="color: #000000;">]; </span><span style="color: #008000;">//</span><span style="color: #008000;">注意这里,如果处理会json解析失败</span> <span style="color: #800080;">$line</span>=<span style="color: #008080;">str_replace</span>("\r\n", "", <span style="color: #800080;">$line</span><span style="color: #000000;">); </span><span style="color: #800080;">$result</span>[<span style="color: #800080;">$i</span>]=<span style="color: #0000ff;">array</span>("num"=><span style="color: #800080;">$i</span>+1,"msg"=><span style="color: #008080;">urlencode</span>(<span style="color: #800080;">$line</span><span style="color: #000000;">)); } </span><span style="color: #800080;">$str</span>=<span style="color: #008080;">stripslashes</span>(<span style="color: #008080;">urldecode</span>(json_encode(<span style="color: #800080;">$result</span><span style="color: #000000;">))); </span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$str</span><span style="color: #000000;">; } </span><span style="color: #008000;">/*</span><span style="color: #008000;">* * 读取日志 </span><span style="color: #008000;">*/</span> <span style="color: #0000ff;">private</span> <span style="color: #0000ff;">function</span> readLogs(<span style="color: #800080;">$filePath</span>,<span style="color: #800080;">$num</span>=20<span style="color: #000000;">){ </span><span style="color: #800080;">$fp</span> = <span style="color: #008080;">fopen</span>(<span style="color: #800080;">$filePath</span>,"r"<span style="color: #000000;">); </span><span style="color: #800080;">$pos</span> = -2<span style="color: #000000;">; </span><span style="color: #800080;">$eof</span> = ""<span style="color: #000000;">; </span><span style="color: #800080;">$head</span> = <span style="color: #0000ff;">false</span>; <span style="color: #008000;">//</span><span style="color: #008000;">当总行数小于Num时,判断是否到第一行了 </span> <span style="color: #800080;">$lines</span> = <span style="color: #0000ff;">array</span><span style="color: #000000;">(); </span><span style="color: #0000ff;">while</span>(<span style="color: #800080;">$num</span>>0<span style="color: #000000;">){ </span><span style="color: #0000ff;">while</span>(<span style="color: #800080;">$eof</span> != "\n"<span style="color: #000000;">){ </span><span style="color: #0000ff;">if</span>(<span style="color: #008080;">fseek</span>(<span style="color: #800080;">$fp</span>, <span style="color: #800080;">$pos</span>, SEEK_END)==0){ <span style="color: #008000;">//</span><span style="color: #008000;">fseek成功返回0,失败返回-1 </span> <span style="color: #800080;">$eof</span> = <span style="color: #008080;">fgetc</span>(<span style="color: #800080;">$fp</span><span style="color: #000000;">); </span><span style="color: #800080;">$pos</span>--<span style="color: #000000;">; }</span><span style="color: #0000ff;">else</span>{ <span style="color: #008000;">//</span><span style="color: #008000;">当到达第一行,行首时,设置$pos失败 </span> <span style="color: #008080;">fseek</span>(<span style="color: #800080;">$fp</span>,0,<span style="color: #000000;">SEEK_SET); </span><span style="color: #800080;">$head</span> = <span style="color: #0000ff;">true</span>; <span style="color: #008000;">//</span><span style="color: #008000;">到达文件头部,开关打开 </span> <span style="color: #0000ff;">break</span><span style="color: #000000;">; } } </span><span style="color: #008080;">array_unshift</span>(<span style="color: #800080;">$lines</span>,<span style="color: #008080;">fgets</span>(<span style="color: #800080;">$fp</span><span style="color: #000000;">)); </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$head</span>){ <span style="color: #0000ff;">break</span>; } <span style="color: #008000;">//</span><span style="color: #008000;">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 </span> <span style="color: #800080;">$eof</span> = ""<span style="color: #000000;">; </span><span style="color: #800080;">$num</span>--<span style="color: #000000;">; } </span><span style="color: #008080;">fclose</span>(<span style="color: #800080;">$fp</span><span style="color: #000000;">); </span><span style="color: #0000ff;">return</span> <span style="color: #008080;">array_reverse</span>(<span style="color: #800080;">$lines</span><span style="color: #000000;">); } } Test</span>::main();
java文件:
<span style="color: #0000ff;">import</span><span style="color: #000000;"> java.io.InputStream; </span><span style="color: #0000ff;">import</span><span style="color: #000000;"> java.net.HttpURLConnection; </span><span style="color: #0000ff;">import</span><span style="color: #000000;"> java.net.URL; </span><span style="color: #0000ff;">import</span><span style="color: #000000;"> org.json.JSONArray; </span><span style="color: #0000ff;">import</span><span style="color: #000000;"> org.json.JSONObject; </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> ReadLogs { </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <span style="color: #0000ff;">void</span> main(String[] args) <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception { URL url </span>= <span style="color: #0000ff;">new</span> URL("http://localhost/test.php?action=showApacheLogs"<span style="color: #000000;">); HttpURLConnection conn </span>=<span style="color: #000000;"> (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(</span>10000<span style="color: #000000;">); conn.setRequestMethod(</span>"GET"<span style="color: #000000;">); conn.setDoInput(</span><span style="color: #0000ff;">true</span><span style="color: #000000;">); conn.setDoOutput(</span><span style="color: #0000ff;">true</span><span style="color: #000000;">); </span><span style="color: #008000;">//</span><span style="color: #008000;"> 输出返回结果</span> InputStream input =<span style="color: #000000;"> conn.getInputStream(); </span><span style="color: #0000ff;">int</span> resLen =0<span style="color: #000000;">; </span><span style="color: #0000ff;">byte</span>[] res = <span style="color: #0000ff;">new</span> <span style="color: #0000ff;">byte</span>[1024<span style="color: #000000;">]; StringBuilder sb</span>=<span style="color: #0000ff;">new</span><span style="color: #000000;"> StringBuilder(); </span><span style="color: #0000ff;">while</span>((resLen=input.read(res))!=-1<span style="color: #000000;">){ sb.append(</span><span style="color: #0000ff;">new</span> String(res, 0<span style="color: #000000;">, resLen)); } String jsonStr</span>=<span style="color: #000000;">sb.toString(); </span><span style="color: #008000;">//</span><span style="color: #008000;">String转换成JSON</span> JSONArray jsonArray=<span style="color: #0000ff;">new</span><span style="color: #000000;"> JSONArray(jsonStr); </span><span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> i=0;i<jsonArray.length();i++<span style="color: #000000;">){ JSONObject jsonObject</span>=<span style="color: #0000ff;">new</span><span style="color: #000000;"> JSONObject(jsonArray.getString(i)); String msg</span>=(String) jsonObject.get("msg"<span style="color: #000000;">); </span><span style="color: #0000ff;">int</span> num=(<span style="color: #0000ff;">int</span>) jsonObject.get("num"<span style="color: #000000;">); System.out.println(num</span>+":"+<span style="color: #000000;">msg); } } }</span>