通过网络得到html，并解析出其中网址(JAVA程序)

网络版程序：

import java.io.BufferedReader;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.URL;

import java.net.URLConnection;

import java.util.ArrayList;

import java.util.List;

public class TestIndex {

    private String rootUrl = "http://localhost/apk/";

    private String listUrl = rootUrl + "test-index.htm";

    private static List<String> imageUrlList = new ArrayList<String>();

    public static void main(String args[]){

        TestIndex ti = new TestIndex();

        ti.getData();

        System.out.println(imageUrlList.size());

        for(int i=0; i<imageUrlList.size();i++){

            System.out.println(imageUrlList.get(i));

        }

    }

    private InputStream getNetInputStream(String urlStr)

    {

        try

        {

            URL url = new URL(urlStr);

            URLConnection conn = url.openConnection();

            conn.connect();

            InputStream is = conn.getInputStream();

            return is;

        }

        catch (Exception e)

        {

        }

        return null;

    }

    private void getData() {

        try

        {

            InputStream is = getNetInputStream(listUrl);

            InputStreamReader isr = new InputStreamReader(is);

            BufferedReader br = new BufferedReader(isr);

            String s = null;

            String html="";

            while ((s = br.readLine()) != null)

            {

                html+=s;

            }

            is.close();

            String startStr = "src=\"https://";

            String endStr = " width=";

            int start = 0;

            int end = 0;

            int index =0;

            imageUrlList.clear();

            while (true)

            {

                start = html.indexOf(startStr, index);

                if (start < 0)

                    break;

                index=start;

                end = html.indexOf(endStr, index);

                String ss = html.substring(start+5,end-1);

                imageUrlList.add(ss);

                index +=ss.length();

            }

        }

        catch (Exception e)

        {

            // TODO: handle exception

        }

    }

}

本地版程序：

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.List;

public class TestIndex_IO {

    private String rootUrl = "D:/Hixin/webandroid/";

    private String listUrl = rootUrl + "test-index.htm";

    private static List<String> imageUrlList = new ArrayList<String>();

    public static void main(String args[]){

        TestIndex_IO ti = new TestIndex_IO();

        ti.getData();

        System.out.println(imageUrlList.size());

        for(int i=0; i<imageUrlList.size();i++){

            System.out.println(imageUrlList.get(i));

        }

    }

    private InputStream getNetInputStream(String urlStr)

    {

            InputStream is;

            try {

                is = new FileInputStream(new File(urlStr));

                return is;

            } catch (FileNotFoundException e) {

                e.printStackTrace();

            }

            return null;

    }

    private void getData() {

        try

        {

            InputStream is = getNetInputStream(listUrl);

            InputStreamReader isr = new InputStreamReader(is);

            BufferedReader br = new BufferedReader(isr);

            String s = null;

            String html="";

            while ((s = br.readLine()) != null)

            {

                html+=s;

            }

            is.close();

            String startStr = "src=\"https://";

            String endStr = " width=";

            int start = 0;

            int end = 0;

            int index =0;

            imageUrlList.clear();

            while (true)

            {

                start = html.indexOf(startStr, index);

                if (start < 0)

                    break;

                index=start;

                end = html.indexOf(endStr, index);

                String ss = html.substring(start+5,end-1);

                imageUrlList.add(ss);

                index +=ss.length();

            }

        }

        catch (Exception e)

        {

            // TODO: handle exception

        }

    }

}

差别仅仅在于private InputStream getNetInputStream(String urlStr)函数。为避免中文乱码，建议InputStreamReader isr = new InputStreamReader(is,"utf-8");

            InputStream is = getNetInputStream(listUrl);

            InputStreamReader isr = new InputStreamReader(is);

            BufferedReader br = new BufferedReader(isr);

            String s = null;

            String html="";

            while ((s = br.readLine()) != null)

            {

                html+=s;

            }

            System.out.println(html.length());

            is.close();

输出结果为：77300

            InputStream is = getNetInputStream(listUrl);

            InputStreamReader isr = new InputStreamReader(is,"utf-8");

            BufferedReader br = new BufferedReader(isr);

            String s = null;

            String html="";

            while ((s = br.readLine()) != null)

            {

                html+=s;

            }

            System.out.println(html.length());

            is.close();

输出结果为：77135

 private String writeUrl = "D:/newfile/new/new";

  private String fileName ="test-index.htm";

 File f = new File(writeUrl);

            if(!f.exists()) {

                f.mkdirs();

            }

            File f1 = new File(f, fileName);

            FileOutputStream fos = new FileOutputStream(f1);

            OutputStreamWriter osw = new OutputStreamWriter(fos);  

           osw.write(html,0,html.length());

           osw.flush();

           osw.close();

解析出htm文件中包含的网址。

结果：

20

https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcRvQgUjsVDBncM3mVIgIyIuE87BnlyJUy2BNsAp8kUoTanrC_css5mVAw

https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcThd8cYjOTmCgYJZxX5ls-xpxaAlH1_yocOSCqI5_7OkL29SNtbCZ7q2Yoj

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTl-FzKmsppxuwzmTITGCv9uDxmrWr1pG0lw8mUD9wkWIloASxQeBEMnVjz

https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcQWbmiZJIXKHV2IoTBp7zSY6kD5g5VPzVtBTLJYYR5nwTtKi2-0_u93qL4e

https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcSlrLi_GtVgUehU7coFe1eMdrJxPdvS42iTqXkla0g75s31NBfAq2u1LE4

https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcSkrlyGxSs8Dr_7k3MUvoGq1vE45LgHZ0zEhIEdD9LLZiaoMcE7IAqn8ho

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTu__OUSJ4R4EKBu4jOi2ZAdHohpVQIBy3-SfnI8FYpN8wVC9kJG_aWuk_w

https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcR3Bf7YtsHJ813A5_wWzpxIy4MbEmqz5NLw3qv1nPxOZqVjH7QlY-qYSCg

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcToB4nJPqVwnzn0xeasnXyhxGgOqHXdypE6KZIMTfV9k52eIrE3iYsA6Ixm

https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTkKw0LpqdB2eQMUpwdQdvM9DTeNtq1mrvMNivoQtN37p3m0OPsx4ME9i4O

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSZGzMf_3hmdDktz91yp5ZQi-eGWLCenZ0U446sXT2nqYuwlWRI_V_BVIWi

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTQF-55T5GM3dLdaoafPdlIYK0ESNvM6-Bsb4-B2rQTeyD5gGoCKxokExM-

https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcRoRjo4TFeXmx47zE6VH0ylcO0IQ2HBsOHYIMJCI9MsRyg_PF1WhHbqG76Q

https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcRrdegt1koEy51dLWrJAbVMJBlCEZ7fPl2mztYYM6onvxocRCq030Ft1gE

https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTtnQpte0uq9Ue9nsg25GeO1kw_-Hcn69ozTQkiMBHrXKwlANutyhwKD9XM

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRNRdxzmuFKABoGgyv2SC0gMticosL2LB3V1fBMOwNtVBZxHkyMw4IcWBFj

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQr40CEf75nWCj5dg-oeKtb9zK6mhktu7vnfoYAh5ioy34goC3c9ptDkQwP

https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcQUnyHrVEbppqhZnWnQrijhBFP0X34gRf7pKw6PdT4ggepB2k9g-p71sgGh

https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcR9Us9qblbTJaw47gULXCI8sHKN4I61gYsT2ijebtZzgsMDI8GmYqQpIIw

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSIrW-IbBZjM9Ztn60r9QE1_FIMjt494qGX12tqsLsibYPLuFVwyVSgz1I

用正则表达式更简单：

 InputStream is = getNetInputStream(listUrl);

             InputStreamReader isr = new InputStreamReader(is);

             BufferedReader br = new BufferedReader(isr);

             String s = "";

             while ((s = br.readLine()) != null)

             {

                 Pattern p = Pattern.compile("src=\"https[^\"]+");

                 Matcher m = p.matcher(s);

                 while(m.find()) {

                     System.out.println(m.group());

                 }

             }

 src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcRvQgUjsVDBncM3mVIgIyIuE87BnlyJUy2BNsAp8kUoTanrC_css5mVAw

 src="https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcThd8cYjOTmCgYJZxX5ls-xpxaAlH1_yocOSCqI5_7OkL29SNtbCZ7q2Yoj

 src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTl-FzKmsppxuwzmTITGCv9uDxmrWr1pG0lw8mUD9wkWIloASxQeBEMnVjz

 src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcQWbmiZJIXKHV2IoTBp7zSY6kD5g5VPzVtBTLJYYR5nwTtKi2-0_u93qL4e

 src="https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcSlrLi_GtVgUehU7coFe1eMdrJxPdvS42iTqXkla0g75s31NBfAq2u1LE4

 src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcSkrlyGxSs8Dr_7k3MUvoGq1vE45LgHZ0zEhIEdD9LLZiaoMcE7IAqn8ho

 src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTu__OUSJ4R4EKBu4jOi2ZAdHohpVQIBy3-SfnI8FYpN8wVC9kJG_aWuk_w

 src="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcR3Bf7YtsHJ813A5_wWzpxIy4MbEmqz5NLw3qv1nPxOZqVjH7QlY-qYSCg

 src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcToB4nJPqVwnzn0xeasnXyhxGgOqHXdypE6KZIMTfV9k52eIrE3iYsA6Ixm

 src="https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTkKw0LpqdB2eQMUpwdQdvM9DTeNtq1mrvMNivoQtN37p3m0OPsx4ME9i4O

 src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSZGzMf_3hmdDktz91yp5ZQi-eGWLCenZ0U446sXT2nqYuwlWRI_V_BVIWi

 src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTQF-55T5GM3dLdaoafPdlIYK0ESNvM6-Bsb4-B2rQTeyD5gGoCKxokExM-

 src="https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcRoRjo4TFeXmx47zE6VH0ylcO0IQ2HBsOHYIMJCI9MsRyg_PF1WhHbqG76Q

 src="https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcRrdegt1koEy51dLWrJAbVMJBlCEZ7fPl2mztYYM6onvxocRCq030Ft1gE

 src="https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTtnQpte0uq9Ue9nsg25GeO1kw_-Hcn69ozTQkiMBHrXKwlANutyhwKD9XM

 src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRNRdxzmuFKABoGgyv2SC0gMticosL2LB3V1fBMOwNtVBZxHkyMw4IcWBFj

 src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQr40CEf75nWCj5dg-oeKtb9zK6mhktu7vnfoYAh5ioy34goC3c9ptDkQwP

 src="https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcQUnyHrVEbppqhZnWnQrijhBFP0X34gRf7pKw6PdT4ggepB2k9g-p71sgGh

 src="https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcR9Us9qblbTJaw47gULXCI8sHKN4I61gYsT2ijebtZzgsMDI8GmYqQpIIw

 src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSIrW-IbBZjM9Ztn60r9QE1_FIMjt494qGX12tqsLsibYPLuFVwyVSgz1I

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