(1)java 如何escape HTML代码
如何转义HTML标签
/**
* 去除HTML字串中的控制字符及不可视字符
*
* @param str
* HTML字串
* @return 返回的字串
*/
public static String escapeHTML(String str) {
int length = str.length();
int newLength = length;
boolean someCharacterEscaped = false;
for (int i = 0; i < length; i++) {
char c = str.charAt(i);
int cint = 0xffff & c;
if (cint < 32)
switch (c) {
case 11:
default:
newLength--;
someCharacterEscaped = true;
break;
case ‘\t‘:
case ‘\n‘:
case ‘\f‘:
case ‘\r‘:
break;
}
else
switch (c) {
case ‘"‘:
newLength += 5;
someCharacterEscaped = true;
break;
case ‘&‘:
case ‘\‘‘:
newLength += 4;
someCharacterEscaped = true;
break;
case ‘<‘:
case ‘>‘:
newLength += 3;
someCharacterEscaped = true;
break;
}
}
if (!someCharacterEscaped)
return str;
StringBuffer sb = new StringBuffer(newLength);
for (int i = 0; i < length; i++) {
char c = str.charAt(i);
int cint = 0xffff & c;
if (cint < 32)
switch (c) {
case ‘\t‘:
case ‘\n‘:
case ‘\f‘:
case ‘\r‘:
sb.append(c);
break;
}
else
switch (c) {
case ‘"‘:
sb.append(""");
break;
case ‘\‘‘:
sb.append("'");
break;
case ‘&‘:
sb.append("&");
break;
case ‘<‘:
sb.append("<");
break;
case ‘>‘:
sb.append(">");
break;
default:
sb.append(c);
break;
}
}
return sb.toString();
}
?测试:
@Test
public void test_001(){
String input="<html><input type=\"button\" onlick=\"abc()\" > </html>";
System.out.println(input);
System.out.println(StringUtil.escapeHTML(input));
}
?运行结果:
?
?
(2)java 如何去除html标签,只留下文本
/**
* 删除input字符串中的html格式
*
* @param input
* @param length
* 显示的字符的个数
* @return
*/
public static String splitAndFilterString(String input, int length) {
if (input == null || input.trim().equals("")) {
return "";
}
// 去掉所有html元素,
String str = input.replaceAll("\\&[a-zA-Z]{1,10};", "").replaceAll(
"<[^>]*>", "");
str = str.replaceAll("[(/>)<]", "");
int len = str.length();
if (len <= length) {
return str;
} else {
str = str.substring(0, length);
str += "......";
}
return str;
}
/**
* 返回纯文本,去掉html的所有标签,并且去掉空行
*
* @param input
* @return
*/
public static String splitAndFilterString(String input) {
if (input == null || input.trim().equals("")) {
return "";
}
// 去掉所有html元素,
String str = input.replaceAll("\\&[a-zA-Z]{1,10};", "").replaceAll(
"<[^>]*>", "");
str = str.replaceAll("[(/>)<]", "");
return SystemHWUtil.deleteCRLF(str);
}
/***
* Delete all spaces
*
* @param input
* @return
*/
public static String deleteAllCRLF(String input) {
return input.replaceAll("((\r\n)|\n)[\\s\t ]*", "").replaceAll(
"^((\r\n)|\n)", "");
}
/**
* delete CRLF; delete empty line ;delete blank lines
*
* @param input
* @return
*/
public static String deleteCRLF(String input) {
input = SystemHWUtil.deleteCRLFOnce(input);
return SystemHWUtil.deleteCRLFOnce(input);
}
?见类com\common\util\SystemHWUtil.java
源代码见附件
原文：http://hw1287789687.iteye.com/blog/2175951