一些自己用的java类

Posted 2020-10-26 晓风微微

网络内容爬取、文件操作、KMP匹配 
  1 import java.net.MalformedURLException;
  2 import java.net.URL;
  3 import java.net.URLConnection;
  4 import java.util.ArrayList;
  5 import java.io.*;
  6 import java.util.Scanner;
  7 
  8 class GethtmlData {
  9     private String url;
 10     GetHtmlData(){//构造函数
 11     }
 12     URL readurl;
 13     String bq(String pt) {
 14         String ps;
 15         ps=new String();
 16         if(pt.charAt(0)!=‘h‘&&pt.charAt(1)!=‘t‘&&pt.charAt(2)!=‘t‘&&pt.charAt(3)!=‘p‘) {
 17             ps="https://"+pt;
 18             return ps;
 19         }
 20         return pt;
 21     }
 22     String GetUrl(String pt,boolean check) throws IOException {
 23         if(check==true)
 24             pt=bq(pt);//补全网址
 25         url=new String();
 26         url=pt;//init url
 27         readurl=new URL(url);//url字符串构建URL类
 28         URLConnection connection = readurl.openConnection();//初始化连接
 29         connection.setRequestProperty("User-Agent","Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11");
 30         connection.connect();//开始连接
 31         String line;
 32         String web_data;
 33         web_data=new String();
 34         line=new String();
 35         //输入流
 36         BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream(),"GBK"));
 37         while((line=in.readLine())!=null) {//java 中 null 为小写
 38             web_data+=line;
 39         }
 40         return web_data;
 41     }
 42     
 43     String GetUrl_utf(String pt,boolean check) throws IOException {
 44         if(check==true)
 45             pt=bq(pt);//补全网址
 46         url=new String();
 47         url=pt;//init url
 48         readurl=new URL(url);//url字符串构建URL类
 49         URLConnection connection = readurl.openConnection();//初始化连接
 50         connection.setRequestProperty("User-Agent","Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11") ;
 51         connection.connect();//开始连接
 52         String line;
 53         String web_data;
 54         web_data=new String();
 55         line=new String();
 56         //输入流
 57         BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream(),"UTF-8"));
 58         while((line=in.readLine())!=null) {//java 中 null 为小写
 59             web_data+=line;
 60         }
 61         return web_data;
 62     }
 63 }
 64 class WFILE {
 65     FileWriter fp;
 66     PrintWriter outfp;
 67     boolean OpenFile(String m,String f) {//将s内容输出至文件目录m下的f文件,wdata为文件内容
 68         File catalogue = new File(m);//目录
 69         try {
 70             if (!catalogue.exists()) {
 71                 boolean ok=catalogue.mkdir();
 72                 if(!ok)//如果失败返回失败
 73                     return ok;
 74             }
 75         }
 76         catch(Exception e) {//输出异常
 77             System.out.println("在构建目录时异常,目录名为: "+m);
 78             e.printStackTrace();
 79         }
 80         String lj=m+"\\"+f;
 81         File fe=new File(lj);
 82         try {
 83             if(!fe.exists()) {
 84                 boolean ok2=fe.createNewFile();
 85                 if(!ok2)
 86                     return ok2;
 87             }
 88             fp = new FileWriter(fe);
 89             outfp = new PrintWriter(fp);
 90             return true;
 91         }
 92         catch(Exception e){
 93             System.out.println("在构建文件时异常");
 94             e.printStackTrace();  
 95         }
 96         return false;
 97     }
 98     boolean CloseFile() {
 99         if(fp==null)
100             return false;
101         else {
102             try {
103                 fp.close();
104             } catch (IOException e) {
105                 // TODO Auto-generated catch block
106                 System.out.println("关闭文件错误");
107                 e.printStackTrace();
108             }
109 
110         }
111         return true;
112     }
113     <T>boolean print(T tdata){
114         if (fp==null||outfp==null)
115             return false;
116         outfp.print(tdata);
117         return true;
118     }
119     <T>boolean println(T tdata){
120         if (fp==null||outfp==null)
121             return false;
122         outfp.println(tdata);
123         return true;
124     }
125 }
126 
127 class KMP {
128     int nextp[];
129     int n,m;
130     String pattern;
131     String text;
132     int cc;
133     int pp;
134     KMP(){
135         cc=0;
136         pp=0;
137         last=-1;
138         begin=‘\0‘;
139     }
140     ArrayList<Integer> ans;
141      boolean Set_substring(String pattern) {
142         this.pattern=pattern;
143         if(pattern==null)
144             return false;
145         int n=pattern.length();
146         this.n=n;
147         nextp=new int[n+10];
148         for(int i=0;i<n;i++)
149             nextp[i]=0;
150         for(int i=1;i<n;++i) {
151             int j=i;
152             while(j>0) {
153                 j = nextp[j];
154                 if(pattern.charAt(j)==pattern.charAt(i)) {
155                     nextp[i+1]=j+1;
156                     break;
157                 }
158             }    
159         }
160         return true;
161     }
162     void  find_substring(String text) {
163         ans=new ArrayList<Integer>();
164         this.text=text;
165         int m=text.length();
166         this.m=m;
167         for(int i= 0,j=0;i<m;++i) {
168             if(j<n&&text.charAt(i)==pattern.charAt(j)) {
169                 j++;
170             }
171             else {
172                 while(j>0) {
173                     try{
174                         j=nextp[j];
175                     }
176                     catch(Exception e) {
177                     }
178                     if(text.charAt(i)==pattern.charAt(j)) {
179                         ++j;
180                         break;
181                     }
182                 }
183             }
184             if(j>=n) {
185                 ans.add(i);
186             }
187         }
188     }
189     void Set_min(int t) {//Set the min index
190         cc=t;
191     }
192 
193     char begin;
194     int last;
195     void set_last(int t) {
196         last=t;
197     }
198     void Set_begin(char t) {
199         begin = t;
200     }
201 
202     ArrayList<String> get_data(char s) {
203         char a[];
204         ArrayList<String> zans = new ArrayList<String>();
205         a=new char[m];
206         for(int i=0;i<ans.size();i++) {
207             int w=ans.get(i);
208             if(i==0)
209                 pp=w+1;
210             int ss=w;
211             if(last!=-1&&w>last)
212                 break;
213             if(begin!=‘\0‘) {
214                 while( ss < m && text.charAt(ss) != begin)
215                     ss++;
216                 if(ss==m)
217                     continue;
218                 else {
219                     w=ss;
220                 }
221             }
222             int t=0,ok=0;
223             if(w+1<=cc)
224                 continue;
225             for(int j=w+1;j<m;j++) {
226                 a[t++]=text.charAt(j);
227                 if(a[t-1]==s) {
228                     ok=1;
229                     break;
230                 }
231             }
232             if(ok==1) {
233                 a[t-1]=0;
234                 t-=1;
235             }
236             else
237                 a[t]=0;
238             if(t==0)
239                 continue;
240             char b[];
241             b=new char[t];
242             for(int i1=0;i1<t;i1++)
243                 b[i1]=a[i1];
244             String p=new String(b);
245             zans.add(p);
246         }
247         cc=0;
248         begin = ‘\0‘;
249         last=-1;
250         return zans;
251     }
252 }