(web日志)把后台的日志System.out输出到网页servlet

来源：互联网发布：c语言常量编辑：程序博客网时间：2024/04/28 03:01

纯代码,待优化
把System.out的输出放到servlet中
我以为logback本身有这个功能,但是没有找到,就自己写了试验类的...
* 获取logback日志流...
* 方案1: 直接读取文件分段读取 http://sunnylocus.iteye.com/blog/694666
* 方案2: logback 配置apender到某个流...复杂
* 方案3: 复制System.out流
* 方案4: 读取System.out流再保存(缓存)
后期可以添加 ajax实现 "在线日志" 这是后话了.....

import java.io.IOException;import java.io.OutputStream;import java.io.PrintStream;import java.io.*;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class WebLogerServlet   extends HttpServlet{static OutputStream life =null; Logger logger = LoggerFactory.getLogger(PosConsumeServlet.class);public void init(){System.setOut(new PrintStream(new BuffStream()));System.setErr(new PrintStream(new BuffStream()));System.out.println("100KB....");}private static final long serialVersionUID = 1L;public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{response.setContentType("application/json");response.getWriter().write(BuffStream.getBuff());}}class  BuffStream extends OutputStream{static char[]  buff=new char[1024*100];  // 100KB内容static   OutputStream cout=System.out; //把原来的out保存下来.static    OutputStream cerr =System.err;static int   index=0; public static String getBuff(){//new ByteSchar[] bb=new char[index];for(int i=0;i{bb[i]=buff[i];}return new String(bb);}@Overridepublic void write(int b) throws IOException {cout.write(b);if(index{buff[index]=(char) b;index++;}else{index=0;}}}class DoubleStream extends OutputStream {OutputStream output1;OutputStream output2;public DoubleStream(OutputStream output1, OutputStream output2) {this.output1 = output1;this.output2 = output2;}public void write(int b) throws IOException {if(output1!=null)output1.write(b);if(output2!=null){output2.write(b);}}}//Logger logger=LoggerFactory.getLogger(WebLogerServlet.class);//LoggerFactory.getILoggerFactory();//   LoggerContext lc = (LoggerContext)LoggerFactory.getILoggerFactory();//   lc.//    lc.getStatusManager();

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