关键字过滤java

① 求过滤关键字的正则表达式JAVA

String str="fa证迷袭";
String regEx="[^办证迷药]*";
boolean flag=str.matches(regEx);
System.out.println(flag);

② java 字符串过滤

packagetest;
importjava.util.HashMap;
/**
*maxLength-需要过滤最长字符串的长度
*filterStrs<string,string>-需要过滤字符串的集合，key为需要过滤字符串，value为过滤成的字符串如"*"
*@authorAdministrator
*
*/
publicclassTest{
privateintmaxLength;
privateHashMap<String,String>filterStrs=newHashMap<String,String>();
/**
*初始化需要过滤掉*的数量
*/
privateStringinitStr(intn){
StringBuffersb=newStringBuffer();
for(inti=0;i<n;i++){
sb.append('*');
}
returnsb.toString();
}
/**
*str-被过滤得字符串
*s-需要过滤得字符串
*获得剩下未过滤的字符串
*/
privateStringgetNextStr(Stringstr,intstart,intslength){
if(start==0){
str=str.substring(slength);
}elseif(start+slength<str.length()){
str=str.substring(start+slength);
}
returnstr;
}
/**
*str-被过滤得字符串
*s-需要过滤得字符串
*获得过滤后的字符串
*/
(StringBuffersb,Stringstr,intstart,Strings){
if(start!=0){
sb.append(str.substring(0,start));
}
sb.append(filterStrs.get(s));
returnsb;
}
/**
*str-被过滤的字符串
*过滤，并组合过滤后的字符串
*/
publicStringfilter(Stringstr){
StringBufferresultStr=newStringBuffer();
for(intstart=0;start<str.length();start++){
for(intend=start+1;end<=str.length()&&end<=start+maxLength;end++){
Strings=str.substring(start,end);
intslength=s.length();
if(filterStrs.containsKey(s)){
resultStr=getFilterStr(resultStr,str,start,s);
str=getNextStr(str,start,slength);
start=0;
end=start;
}
}
}
resultStr.append(str);
returnresultStr.toString();
}
publicvoidput(Stringkey){
intkeyLength=key.length();
filterStrs.put(key,initStr(keyLength));
if(keyLength>this.maxLength)
maxLength=keyLength;
}
publicstaticvoidmain(String[]agrs){
Testt=newTest();
t.put("TMD");
t.put("TNND");
t.put("NND");
System.out.println(t.filter("TMD，TNND..TMDTMDTMDTMD.tTNNDTMDTNNDTNNDTNND"));
}
}

③ jsp\java 如何编写过滤器过滤特殊字符

package com.jing.common;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class IllegalCharacterFilter implements Filter {
private String[] characterParams = null;
private boolean OK=true;

public void init(FilterConfig config) throws ServletException {

// if(config.getInitParameter("characterParams").length()<1)
// OK=false;
// else
// this.characterParams = config.getInitParameter("characterParams").split(",");
System.out.println("初始化");
}

@SuppressWarnings("unchecked")
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain arg2) throws IOException, ServletException {
HttpServletRequest servletrequest = (HttpServletRequest) request;
HttpServletResponse servletresponse = (HttpServletResponse) response;
String param = "";
String paramValue = "";

//设置请求编码格式
servletresponse.setContentType("text/html");
servletresponse.setCharacterEncoding("UTF-8");
servletrequest.setCharacterEncoding("UTF-8");
java.util.Enumeration params = request.getParameterNames();
//循环读取参数
while (params.hasMoreElements()){
param = (String) params.nextElement(); //获取请求中的参数
String[] values = servletrequest.getParameterValues(param);//获得每个参数对应的值

for (int i = 0; i < values.length; i++) {

paramValue = values[i];

//转换目标字符变成对象字符，可以多个。后期扩展特殊字符库用于管理
paramValue = paramValue.replaceAll("'","");
paramValue = paramValue.replaceAll("@","");
paramValue = paramValue.replaceAll("胡锦涛","***");

//这里还可以增加，如领导人 自动转义成****,可以从数据库中读取非法关键字。
values[i] = paramValue;

}

//把转义后的参数重新放回request中
request.setAttribute(param, paramValue);
}
//继续向下 执行请求，如果有其他过滤器则执行过滤器
arg2.doFilter(request, response);
}

public void destroy() {
// TODO Auto-generated method stub
}
}

④ java语言实现满足多条件匹配简单过滤输出问题

package;

importjava.io.File;
importjava.io.FileWriter;
importjava.io.IOException;
importjava.util.Arrays;
importjava.util.LinkedList;

publicclassCombin
{
	privatestaticStringline=System.getProperty("line.separator");

	privatestaticLinkedList<String[]>recursionSub(LinkedList<String[]>list,intcount,String[]array,intind,
			intstart,int...indexs)
	{
		start++;
		if(start>count-1)
		{
			returnnull;
		}
		if(start==0)
		{
			indexs=newint[array.length];
		}
		for(indexs[start]=ind;indexs[start]<array.length;indexs[start]++)
		{
			recursionSub(list,count,array,indexs[start]+1,start,indexs);
			if(start==count-1)
			{
				String[]temp=newString[count];
				for(inti=count-1;i>=0;i--)
				{
					temp[start-i]=array[indexs[start-i]];
				}
				booleanflag=true;
				L:for(inti=0;i<temp.length;i++)
				{
					for(intj=i+1;j<temp.length;j++)
					{
						if(temp[i]==temp[j])
						{
							flag=false;
							breakL;
						}
					}
				}
				if(flag)
				{
					list.add(temp);
				}
			}
		}
		returnlist;
	}

	privatestaticvoidfilter(LinkedList<String[]>list)throwsIOException
	{
		Filefile=newFile("c:/116.txt");
		FileWriterfw=newFileWriter(file);
		for(String[]strings:list)
		{
			intcount1=0,count2=0,count3=0;
			Stringtemp=Arrays.toString(strings).replaceAll("[\[\]\s]","");
			if(temp.contains("01"))
			{
				count1++;
				count3++;
			}
			if(temp.contains("02"))
			{
				count1++;
				count2++;
			}
			if(temp.contains("03"))
			{
				count1++;
			}
			if(temp.contains("06"))
			{
				count2++;
				count3++;
			}
			if(temp.contains("08"))
			{
				count2++;
				count3++;
			}
			if(temp.contains("09"))
			{
				count2++;
				count3++;
			}
			if(temp.contains("07"))
			{
				count3++;
			}
			if(temp.contains("10"))
			{
				count3++;
			}
			if(temp.contains("11"))
			{
				count3++;
			}
			if(count1>=1&&count1<=2&&count2>=1&&count2<=3&&count3>=0&&count3<=2)
			{
				fw.write(temp+line);
			}
		}
		fw.flush();
		fw.close();
	}

	publicstaticvoidmain(String[]args)throwsIOException
	{
		String[]A={"01","02","03","04","05","06","07","08","09","10","11"};
		LinkedList<String[]>list=newLinkedList<String[]>();
		recursionSub(list,6,A,0,-1);
		
		//假定从1-11这11个数字中任选6个全组合输出(每行输出6个不相同数字,并且从小到大排列)
		for(String[]strings:list)
		{
			Stringtemp=Arrays.toString(strings).replaceAll("[\[\]\s]","");
			System.out.println(temp);
		}
		//将第一问得到数据过滤,并且同时满足下面3条条件就输出,输出结果用"116.txt"保存在C盘
		filter(list);
	}
}

⑤ 在JAVA中怎么实现关键字过滤

自己判断一下, 字符串中是否包含某个关键字即可, String.contains(CharSequence s) 如果存在返回true, 否则返回false

⑥ 高分求一个使用Java Hashtable的关键字过滤小程序

这个应该就是你想要达到的效果吧 ？？
添加了个程序运行时间，不过像这样的一点文本，一般几乎不会用时间的

import java.util.Hashtable;

public class TestStr {
public static boolean getStr(String text,String str[]){
Hashtable map=new Hashtable();
char c[]=text.toCharArray();
for (int i = 0; i < str.length; i++) {
map.put(str[i].trim(), str[i].trim());
}
int count=0;
for (int i = 0; i < c.length; i++) {
if(map.get(c[i]+"")!=null){
count++;
}
}
System.out.println("关键字出现次数"+count);
return count > 0;
}
public static void main(String[] args) {
//预设的文本内容
String text=aa@bb%cc*dd$;
//预设的关键字
String str[]={"@","%","*","$"};
double start = System.currentTimeMillis() ;
boolean bl=TestStr.getStr(text, str);
double end = System.currentTimeMillis();
System.out.println("查询执行时间: " + (end - start));
if(bl){
System.out.println("文本中出现关键字");
}else{
System.out.println("文本中未出现关键字");
}
}
}

⑦ JAVA中如何过滤字符串里面特殊字符

class test
{

public static void main(String []args)
{
String a = "1111-22-33 13:15:46",b=new String();
int i,j,t;
for(i=0;i<a.length();i++)
if(a.charAt(i)!='-' && a.charAt(i)!=':' && a.charAt(i)!=' ')
b=b+a.charAt(i);
System.out.println(b);
}
}

⑧ 求高效率的 java+mysql 关键字过滤代码

你金币都不奖，叫别人出力，可能吗？我也想要啊。。。