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StringUtils.java
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package com.core;
import java.util.Date;
import java.text.SimpleDateFormat;
import java.text.ParseException;
/**
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2008</p>
* <p>Company: MR</p>
* @version 1.0
*/
//对字符串进行GBK编码
public class StringUtils {
public static String toChinese(String strvalue) {
try {
if (strvalue == null) {
return "";
} else {
strvalue = new String(strvalue.getBytes("ISO8859_1"), "GBK");
return strvalue;
}
} catch (Exception e) {
return "";
}
}
//对输入的字符串进行一次编码转换，防止SQL注入
public static String StringtoSql(String str) {
str = nullToString(str, "");
try {
str = str.trim().replace('\'', (char) 1);
} catch (Exception e) {
return "";
}
return str;
}
//对字符串进行二次编码转换，防止出库时异常
public static String SqltoString(String str) {
str = nullToString(str, "");
try {
str = str.replace( (char) 1, '\'').trim();
} catch (Exception e) {
return "";
}
return str;
}
//对字符串进行Unicode编码
public static String toUnicode(String strvalue) {
try {
if (strvalue == null) {
return null;
} else {
strvalue = new String(strvalue.getBytes("GBK"), "ISO8859_1");
return strvalue;
}
} catch (Exception e) {
return "";
}
}
//判断是否为当前时间
public static boolean compareNowTime(String date) {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date d = null;
try {
d = format.parse(date); //返回一个Date类的实例
} catch (ParseException ex) {
}
if (System.currentTimeMillis() - 259200000 < d.getTime()) {
return true;
}
return false;
}
//判断用户输入的是否是数字或字母
public static boolean isID(String str) {
if (str != null && str.length() > 0) {
if (str.charAt(0) < 57 && str.charAt(0) > 48) {
return false;
}
for (int i = 0; i < str.length(); i++) {
if (str.charAt(i) < 65 && str.charAt(i) > 57 || str.charAt(i) > 90
&& str.charAt(i) < 97 && str.charAt(i) != 95 || str.charAt(i) > 122 ||
str.charAt(i) < 48) {
return false;
}
}
return true;
}
return false;
}
//对输入数据中的HTML字符进行转换
public static final String escapeHTMLTags(String input) {
if (input == null || input.length() == 0) {
return input;
}
StringBuffer buf = new StringBuffer(input.length());
char ch = ' ';
for (int i = 0; i < input.length(); i++) {
ch = input.charAt(i);
if (ch == '<') {
buf.append("<");
} else if (ch == '>') {
buf.append(">");
} else {
buf.append(ch);
}
}
String str=buf.toString();
str=str.replace(" "," ");
str=str.replace("\r\n","<br>");
return str;
}
//处理字符串中的空值
public static final String nullToString(String v, String toV) {
if (v == null) {
v = toV;
}
return v;
}
// 对SQL语句中输入的空值进行处理
public static final String SqlToLink(String str) {
str = StringUtils.nullToString(str, "");
if ("".equals(str)) {
str = " LIKE '%' ";
} else {
str = (" LIKE '%" + str + "%' ");
}
return str;
}
//将整型值转换为字符串
public static final String SqlToLink(int i) {
String str = "";
try {
str = new Integer(i).toString();
} catch (Exception e) {}
if (i == -1) {
str = "";
}
return StringUtils.SqlToLink(str);
}
}