常用的java函数（二) 常用字符串处理
# /**
# * 分割字符串
# *
# * @param str String 原始字符串
# * @param splitsign String 分隔符
# * @return String[] 分割后的字符串数组
# */
# public static String[] split(String str, String splitsign) {
# int index;
# if (str == null || splitsign == null)
# return null;
# ArrayList al = new ArrayList();
# while ((index = str.indexOf(splitsign)) != -1) {
# al.add(str.substring(0, index));
# str = str.substring(index + splitsign.length());
# }
# al.add(str);
# return (String[]) al.toArray(new String[0]);
# }
#
# /**
# * 替换字符串
# *
# * @param from String 原始字符串
# * @param to String 目标字符串
# * @param source String 母字符串
# * @return String 替换后的字符串
# */
# public static String replace(String from, String to, String source) {
# if (source == null || from == null || to == null)
# return null;
# StringBuffer bf = new StringBuffer("");
# int index = -1;
# while ((index = source.indexOf(from)) != -1) {
# bf.append(source.substring(0, index) + to);
# source = source.substring(index + from.length());
# index = source.indexOf(from);
# }
# bf.append(source);
# return bf.toString();
# }
#
# /**
# * 替换字符串，能能够在HTML页面上直接显示(替换双引号和小于号)
# *
# * @param str String 原始字符串
# * @return String 替换后的字符串
# */
# public static String htmlencode(String str) {
# if (str == null) {
# return null;
# }
#
# return replace("\"", """, replace("<", "<", str));
# }
#
# /**
# * 替换字符串，将被编码的转换成原始码（替换成双引号和小于号）
# *
# * @param str String
# * @return String
# */
# public static String htmldecode(String str) {
# if (str == null) {
# return null;
# }
#
# return replace(""", "\"", replace("<", "<", str));
# }
#
# private static final String _BR = "<br/>";
#
# /**
# * 在页面上直接显示文本内容，替换小于号，空格，回车，TAB
# *
# * @param str String 原始字符串
# * @return String 替换后的字符串
# */
# public static String htmlshow(String str) {
# if (str == null) {
# return null;
# }
#
# str = replace("<", "<", str);
# str = replace(" ", " ", str);
# str = replace("\r\n", _BR, str);
# str = replace("\n", _BR, str);
# str = replace("\t", " ", str);
# return str;
# }
#
# /**
# * 返回指定字节长度的字符串
# *
# * @param str String 字符串
# * @param length int 指定长度
# * @return String 返回的字符串
# */
# public static String toLength(String str, int length) {
# if (str == null) {
# return null;
# }
# if (length <= 0) {
# return "";
# }
# try {
# if (str.getBytes("GBK").length <= length) {
# return str;
# }
# } catch (Exception ex) {
# }
# StringBuffer buff = new StringBuffer();
#
# int index = 0;
# char c;
# length -= 3;
# while (length > 0) {
# c = str.charAt(index);
# if (c < 128) {
# length--;
# } else {
# length--;
# length--;
# }
# buff.append(c);
# index++;
# }
# buff.append("...");
# return buff.toString();
# }
#
# /**
# * 判断是否为整数
# *
# * @param str 传入的字符串
# * @return 是整数返回true,否则返回false
# */
# public static boolean isInteger(String str) {
# Pattern pattern = Pattern.compile("^[-\\+]?[\\d]*$");
# return pattern.matcher(str).matches();
# }
#
# /**
# * 判断是否为浮点数，包括double和float
# *
# * @param str 传入的字符串
# * @return 是浮点数返回true,否则返回false
# */
# public static boolean isDouble(String str) {
# Pattern pattern = Pattern.compile("^[-\\+]?[.\\d]*$");
# return pattern.matcher(str).matches();
# }
#
# /**
# * 判断输入的字符串是否符合Email样式.
# *
# * @param str 传入的字符串
# * @return 是Email样式返回true,否则返回false
# */
# public static boolean isEmail(String str) {
# Pattern pattern = Pattern.compile("^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$");
# return pattern.matcher(str).matches();
# }
#
# /**
# * 判断输入的字符串是否为纯汉字
# *
# * @param str 传入的字符窜
# * @return 如果是纯汉字返回true,否则返回false
# */
# public static boolean isChinese(String str) {
# Pattern pattern = Pattern.compile("[\u0391-\uFFE5]+$");
# return pattern.matcher(str).matches();
# }
#
# /**
# * 是否为空白,包括null和""
# *
# * @param str
# * @return
# */
# public static boolean isBlank(String str) {
# return str == null || str.trim().length() == 0;
# }
#
# /**
# * 判断是否为质数
# *
# * @param x
# * @return
# */
# public static boolean isPrime(int x) {
# if (x <= 7) {
# if (x == 2 || x == 3 || x == 5 || x == 7)
# return true;
# }
# int c = 7;
# if (x % 2 == 0)
# return false;
# if (x % 3 == 0)
# return false;
# if (x % 5 == 0)
# return false;
# int end = (int) Math.sqrt(x);
# while (c <= end) {
# if (x % c == 0) {
# return false;
# }
# c += 4;
# if (x % c == 0) {
# return false;
# }
# c += 2;
# if (x % c == 0) {
# return false;
# }
# c += 4;
# if (x % c == 0) {
# return false;
# }
# c += 2;
# if (x % c == 0) {
# return false;
# }
# c += 4;
# if (x % c == 0) {
# return false;
# }
# c += 6;
# if (x % c == 0) {
# return false;
# }
# c += 2;
# if (x % c == 0) {
# return false;
# }
# c += 6;
# }
# return true;
# }
# /**
# * 全角字符转半角字符
# *
# * @param QJStr
# * @return String
# */
# public static final String QJToBJChange(String QJStr)
# {
# char[] chr = QJStr.toCharArray();
# String str = "";
# for (int i = 0; i < chr.length; i++)
# {
# chr[i] = (char) ((int) chr[i] - 65248);
# str += chr[i];
# }
# return str;
# }
# /**
# * 去掉字符串中重复的子字符串
# *
# * @param str
# * @return String
# */
# private static String removeSameString(String str)
# {
# Set<String> mLinkedSet = new LinkedHashSet<String>();
# String[] strArray = str.split(" ");
# StringBuffer sb = new StringBuffer();
#
# for (int i = 0; i < strArray.length; i++)
# {
# if (!mLinkedSet.contains(strArray[i]))
# {
# mLinkedSet.add(strArray[i]);
# sb.append(strArray[i] + " ");
# }
# }
# System.out.println(mLinkedSet);
# return sb.toString().substring(0, sb.toString().length() - 1);
# }
# //过滤特殊字符
# public static String encoding(String src){
# if (src==null)
# return "";
# StringBuilder result=new StringBuilder();
# if (src!=null){
# src=src.trim();
# for (int pos=0;pos<src.length();pos++){
# switch(src.charAt(pos)){
# case '\"':result.append(""");break;
# case '<':result.append("<");break;
# case '>':result.append(">");break;
# case '\'':result.append("'");break;
# case '&':result.append("&");break;
# case '%':result.append("&pc;");break;
# case '_':result.append("&ul;");break;
# case '#':result.append("&shap;");break;
# case '?':result.append("&ques;");break;
# default:result.append(src.charAt(pos));break;
# }
# }
# }
# return result.toString();
# }
#
# //反过滤特殊字符
# public static String decoding(String src){
# if (src==null)
# return "";
# String result=src;
# result=result.replace(""", "\"").replace("'", "\'");
# result=result.replace("<", "<").replace(">", ">");
# result=result.replace("&", "&");
# result=result.replace("&pc;", "%").replace("&ul", "_");
# result=result.replace("&shap;", "#").replace("&ques", "?");
# return result;
# }
#
# /**
# *判断任意一个整数是否素数
# *@paramn
# *@return boolean
# */
# public boolean isPrimes(int n)
# {
# for (int i = 2; i <= Math.sqrt(n); i++) {
# if(n%i==0)
# {
# return false;
# }
# }
# return true;
# }
1. public static String htmlEncode(String source) {
2. if (source == null) {
3. return "";
4. }
5. String html = "";
6. StringBuffer buffer = new StringBuffer();
7.
8. for (int i = 0; i < source.length(); i++) {
9. char c = source.charAt(i);
10.
11. switch (c) {
12. case '<':
13. buffer.append("& l t;");
14.
15. break;
16.
17. case '>':
18. buffer.append("& g t;");
19.
20. break;
21.
22. case '&':
23. buffer.append("& amp;");
24.
25. break;
26.
27. case '"':
28. buffer.append("&q uot;");
29.
30. break;
31.
32. case 10:
33. case 13:
34. break;
35.
36. default:
37. buffer.append(c);
38. }
39. }
40.
41. html = buffer.toString();
42.
43. return html;
44. }
# * 分割字符串
# *
# * @param str String 原始字符串
# * @param splitsign String 分隔符
# * @return String[] 分割后的字符串数组
# */
# public static String[] split(String str, String splitsign) {
# int index;
# if (str == null || splitsign == null)
# return null;
# ArrayList al = new ArrayList();
# while ((index = str.indexOf(splitsign)) != -1) {
# al.add(str.substring(0, index));
# str = str.substring(index + splitsign.length());
# }
# al.add(str);
# return (String[]) al.toArray(new String[0]);
# }
#
# /**
# * 替换字符串
# *
# * @param from String 原始字符串
# * @param to String 目标字符串
# * @param source String 母字符串
# * @return String 替换后的字符串
# */
# public static String replace(String from, String to, String source) {
# if (source == null || from == null || to == null)
# return null;
# StringBuffer bf = new StringBuffer("");
# int index = -1;
# while ((index = source.indexOf(from)) != -1) {
# bf.append(source.substring(0, index) + to);
# source = source.substring(index + from.length());
# index = source.indexOf(from);
# }
# bf.append(source);
# return bf.toString();
# }
#
# /**
# * 替换字符串，能能够在HTML页面上直接显示(替换双引号和小于号)
# *
# * @param str String 原始字符串
# * @return String 替换后的字符串
# */
# public static String htmlencode(String str) {
# if (str == null) {
# return null;
# }
#
# return replace("\"", """, replace("<", "<", str));
# }
#
# /**
# * 替换字符串，将被编码的转换成原始码（替换成双引号和小于号）
# *
# * @param str String
# * @return String
# */
# public static String htmldecode(String str) {
# if (str == null) {
# return null;
# }
#
# return replace(""", "\"", replace("<", "<", str));
# }
#
# private static final String _BR = "<br/>";
#
# /**
# * 在页面上直接显示文本内容，替换小于号，空格，回车，TAB
# *
# * @param str String 原始字符串
# * @return String 替换后的字符串
# */
# public static String htmlshow(String str) {
# if (str == null) {
# return null;
# }
#
# str = replace("<", "<", str);
# str = replace(" ", " ", str);
# str = replace("\r\n", _BR, str);
# str = replace("\n", _BR, str);
# str = replace("\t", " ", str);
# return str;
# }
#
# /**
# * 返回指定字节长度的字符串
# *
# * @param str String 字符串
# * @param length int 指定长度
# * @return String 返回的字符串
# */
# public static String toLength(String str, int length) {
# if (str == null) {
# return null;
# }
# if (length <= 0) {
# return "";
# }
# try {
# if (str.getBytes("GBK").length <= length) {
# return str;
# }
# } catch (Exception ex) {
# }
# StringBuffer buff = new StringBuffer();
#
# int index = 0;
# char c;
# length -= 3;
# while (length > 0) {
# c = str.charAt(index);
# if (c < 128) {
# length--;
# } else {
# length--;
# length--;
# }
# buff.append(c);
# index++;
# }
# buff.append("...");
# return buff.toString();
# }
#
# /**
# * 判断是否为整数
# *
# * @param str 传入的字符串
# * @return 是整数返回true,否则返回false
# */
# public static boolean isInteger(String str) {
# Pattern pattern = Pattern.compile("^[-\\+]?[\\d]*$");
# return pattern.matcher(str).matches();
# }
#
# /**
# * 判断是否为浮点数，包括double和float
# *
# * @param str 传入的字符串
# * @return 是浮点数返回true,否则返回false
# */
# public static boolean isDouble(String str) {
# Pattern pattern = Pattern.compile("^[-\\+]?[.\\d]*$");
# return pattern.matcher(str).matches();
# }
#
# /**
# * 判断输入的字符串是否符合Email样式.
# *
# * @param str 传入的字符串
# * @return 是Email样式返回true,否则返回false
# */
# public static boolean isEmail(String str) {
# Pattern pattern = Pattern.compile("^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$");
# return pattern.matcher(str).matches();
# }
#
# /**
# * 判断输入的字符串是否为纯汉字
# *
# * @param str 传入的字符窜
# * @return 如果是纯汉字返回true,否则返回false
# */
# public static boolean isChinese(String str) {
# Pattern pattern = Pattern.compile("[\u0391-\uFFE5]+$");
# return pattern.matcher(str).matches();
# }
#
# /**
# * 是否为空白,包括null和""
# *
# * @param str
# * @return
# */
# public static boolean isBlank(String str) {
# return str == null || str.trim().length() == 0;
# }
#
# /**
# * 判断是否为质数
# *
# * @param x
# * @return
# */
# public static boolean isPrime(int x) {
# if (x <= 7) {
# if (x == 2 || x == 3 || x == 5 || x == 7)
# return true;
# }
# int c = 7;
# if (x % 2 == 0)
# return false;
# if (x % 3 == 0)
# return false;
# if (x % 5 == 0)
# return false;
# int end = (int) Math.sqrt(x);
# while (c <= end) {
# if (x % c == 0) {
# return false;
# }
# c += 4;
# if (x % c == 0) {
# return false;
# }
# c += 2;
# if (x % c == 0) {
# return false;
# }
# c += 4;
# if (x % c == 0) {
# return false;
# }
# c += 2;
# if (x % c == 0) {
# return false;
# }
# c += 4;
# if (x % c == 0) {
# return false;
# }
# c += 6;
# if (x % c == 0) {
# return false;
# }
# c += 2;
# if (x % c == 0) {
# return false;
# }
# c += 6;
# }
# return true;
# }
# /**
# * 全角字符转半角字符
# *
# * @param QJStr
# * @return String
# */
# public static final String QJToBJChange(String QJStr)
# {
# char[] chr = QJStr.toCharArray();
# String str = "";
# for (int i = 0; i < chr.length; i++)
# {
# chr[i] = (char) ((int) chr[i] - 65248);
# str += chr[i];
# }
# return str;
# }
# /**
# * 去掉字符串中重复的子字符串
# *
# * @param str
# * @return String
# */
# private static String removeSameString(String str)
# {
# Set<String> mLinkedSet = new LinkedHashSet<String>();
# String[] strArray = str.split(" ");
# StringBuffer sb = new StringBuffer();
#
# for (int i = 0; i < strArray.length; i++)
# {
# if (!mLinkedSet.contains(strArray[i]))
# {
# mLinkedSet.add(strArray[i]);
# sb.append(strArray[i] + " ");
# }
# }
# System.out.println(mLinkedSet);
# return sb.toString().substring(0, sb.toString().length() - 1);
# }
# //过滤特殊字符
# public static String encoding(String src){
# if (src==null)
# return "";
# StringBuilder result=new StringBuilder();
# if (src!=null){
# src=src.trim();
# for (int pos=0;pos<src.length();pos++){
# switch(src.charAt(pos)){
# case '\"':result.append(""");break;
# case '<':result.append("<");break;
# case '>':result.append(">");break;
# case '\'':result.append("'");break;
# case '&':result.append("&");break;
# case '%':result.append("&pc;");break;
# case '_':result.append("&ul;");break;
# case '#':result.append("&shap;");break;
# case '?':result.append("&ques;");break;
# default:result.append(src.charAt(pos));break;
# }
# }
# }
# return result.toString();
# }
#
# //反过滤特殊字符
# public static String decoding(String src){
# if (src==null)
# return "";
# String result=src;
# result=result.replace(""", "\"").replace("'", "\'");
# result=result.replace("<", "<").replace(">", ">");
# result=result.replace("&", "&");
# result=result.replace("&pc;", "%").replace("&ul", "_");
# result=result.replace("&shap;", "#").replace("&ques", "?");
# return result;
# }
#
# /**
# *判断任意一个整数是否素数
# *@paramn
# *@return boolean
# */
# public boolean isPrimes(int n)
# {
# for (int i = 2; i <= Math.sqrt(n); i++) {
# if(n%i==0)
# {
# return false;
# }
# }
# return true;
# }
1. public static String htmlEncode(String source) {
2. if (source == null) {
3. return "";
4. }
5. String html = "";
6. StringBuffer buffer = new StringBuffer();
7.
8. for (int i = 0; i < source.length(); i++) {
9. char c = source.charAt(i);
10.
11. switch (c) {
12. case '<':
13. buffer.append("& l t;");
14.
15. break;
16.
17. case '>':
18. buffer.append("& g t;");
19.
20. break;
21.
22. case '&':
23. buffer.append("& amp;");
24.
25. break;
26.
27. case '"':
28. buffer.append("&q uot;");
29.
30. break;
31.
32. case 10:
33. case 13:
34. break;
35.
36. default:
37. buffer.append(c);
38. }
39. }
40.
41. html = buffer.toString();
42.
43. return html;
44. }