关于httpclient ��h��https �Q�如何绕�q�证书验证）

赫赫 — Mon, 22 Oct 2012 23:26:00 GMT

摘要: �W�一�U�方法，适用于httpclient4.X 里边有get和post两种�Ҏ��供你发送请求��用。导入证书发送请求的在这里就不说了，�|�上到处都是 Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->import java.io.BufferedR... 阅读全文

赫赫 2012-10-23 07:26 发表评论

赫赫 — Mon, 22 Oct 2012 23:20:00 GMT

摘要: HttpClient 是我最�q�想研究的东西，以前惌��的一些应用没能有很好的实玎ͼ�发现�q�个开源项目之后就有点眉目了，令�h头痛的cookie问题�q�是有办法解��x��。在�|�上整理了一些东西，写得很好�Q�寄攑֜��q�里�?nbsp; HTTP 协议可能是现�?Internet 上��用得最多、最重要的协议了�Q�越来越多的 Java 应用�E�序需要直接通过 HT... 阅读全文

赫赫 2012-10-23 07:20 发表评论

赫赫 — Mon, 22 Oct 2012 22:52:00 GMT

文�g下蝲采用多线�E�方式能够充分利用CPU资源�Q�关键点是设�|�线�E�的��d��开始和�l�束位置。下面的代码�Q�采用线�E�池启动10个线�E�来执行下蝲

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class FileDownLoadTest {


    private static final int TCOUNT = 10;

    private CountDownLatch latch = new CountDownLatch(TCOUNT);

    private long completeLength = 0;

    private long fileLength;
    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {

        new FileDownLoadTest().download("http://localhost:8080/test/IESSAction.docx");
    }


    public void download(String address) throws Exception{
        ExecutorService service = Executors.newFixedThreadPool(TCOUNT);
        URL url = new URL(address);
        URLConnection cn = url.openConnection();
        cn.setRequestProperty("Referer", "http://www.test.com");
        fileLength = cn.getContentLength();
        long packageLength = fileLength/TCOUNT;
        long leftLength = fileLength%TCOUNT;
        RandomAccessFile file = new RandomAccessFile("d:\\test.docx","rw");
        //计算每个�U�程��h��文�g的开始和�l�束位置
        long pos = 0;
        long endPos = pos + packageLength;
        for(int i=0; i<TCOUNT; i++){
            if(leftLength >0){
                endPos ++;
                leftLength--;
            }
            service.execute(new DownLoadThread(url, file, pos, endPos));
            pos = endPos;
            endPos = pos + packageLength;
        }
        System.out.println("waiting.");
        long begin = System.currentTimeMillis();
        latch.await();
        file.close();
        System.out.println("end.");
        System.out.println(System.currentTimeMillis() - begin + "ms");
        service.shutdown();
    }

    class DownLoadThread implements Runnable{

        private URL url;
        private RandomAccessFile file;
        private long from;
        private long end;

        DownLoadThread(URL url, RandomAccessFile file, long from, long end){
            this.url = url;
            this.file = file;
            this.from = from;
            this.end = end;
        }


        public void run() {
            long pos = from;
            byte[] buf = new byte[512];
            try {
                HttpURLConnection cn = (HttpURLConnection) url.openConnection();
                cn.setRequestProperty("Range", "bytes=" + from + "-" + end);
                if(cn.getResponseCode() != 200 && cn.getResponseCode()!=206){
                    run();
                    return;
                }
                BufferedInputStream bis = new BufferedInputStream(cn.getInputStream());
                int len ;
                while((len = bis.read(buf)) != -1){
//                    synchronized(file){
                        file.seek(pos);
                        file.write(buf, 0, len);
//                    }
                    pos += len;
                    completeLength +=len;
                    System.out.println("threadName: " + Thread.currentThread().getName()
                            + "persent: " + completeLength * 100 /fileLength + "%");
                }
                cn.disconnect();
                latch.countDown();
            } catch (IOException e) {
                e.printStackTrace();

            }
        }
    }
}

赫赫 2012-10-23 06:52 发表评论

Ext js导出Excel

赫赫 — Mon, 22 Oct 2012 08:15:00 GMT

摘要: 做一个导出Excel的功能，��目前台用的ExtJS,后台用的JAVA�Q�网上查了查�Q�大概有3�U�做法�?1.apache公司提供的POI 2.韩国公司的JXL 3.据说是官�Ҏ��供的JS调用�Ҏ�� 前两�U�都要引入外包，懒得扑֌�了，采用了第三种�Q�所需引入JS代码如下�Q? Code highlighting produced by Actipro CodeHighlighter (freewa... 阅读全文

赫赫 2012-10-22 16:15 发表评论

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关于httpclient ��h��https �Q�如何绕�q�证书验证）

Ext js导出Excel