一、問題描述
最原始的JSP項目,前台錄入特殊字元單引号('),控制台NetWork報錯“HTTP Status 404 - /ProjectName/common/filtererror.jsp”,導緻資料存不進去。
二、解決方案
- 前端錄入字段将單引号等其他特殊符号進行編碼;
- 背景将接收的前台内容,使用Java方法實作JS的unescape函數來解碼;
package com.sinosoft.utility;
/**
* JavaScript escape/unescape 編碼的 Java 實現
* 處理前端錄入的特殊字元
*/
public class Escape {
public static String escape(String src) {
int i;
char j;
StringBuffer tmp = new StringBuffer();
tmp.ensureCapacity(src.length() * 6);
for (i = 0; i < src.length(); i++) {
j = src.charAt(i);
if (Character.isDigit(j) || Character.isLowerCase(j) || Character.isUpperCase(j))
tmp.append(j);
else if (j < 256) {
tmp.append("%");
if (j < 16)
tmp.append("0");
tmp.append(Integer.toString(j, 16));
} else {
tmp.append("%u");
tmp.append(Integer.toString(j, 16));
}
}
return tmp.toString();
}
public static String unescape(String src) {
StringBuffer tmp = new StringBuffer();
tmp.ensureCapacity(src.length());
int lastPos = 0, pos = 0;
char ch;
while (lastPos < src.length()) {
pos = src.indexOf("%", lastPos);
if (pos == lastPos) {
if (src.charAt(pos + 1) == 'u') {
ch = (char) Integer.parseInt(src.substring(pos + 2, pos + 6), 16);
tmp.append(ch);
lastPos = pos + 6;
} else {
ch = (char) Integer.parseInt(src.substring(pos + 1, pos + 3), 16);
tmp.append(ch);
lastPos = pos + 3;
}
} else {
if (pos == -1) {
tmp.append(src.substring(lastPos));
lastPos = src.length();
} else {
tmp.append(src.substring(lastPos, pos));
lastPos = pos;
}
}
}
return tmp.toString();
}
public static void main(String[] args) {
/*
* String tmp =
* "!@#¥%……&d*()——+{}|:的“”?》《,。、;‘【、】’》!@#$%^&*()_+{}|:\"<>?,./;'[]\\";
* System.out.println("testing escape : " + tmp); tmp = escape(tmp);
* System.out.println(tmp); System.out.println("testing unescape :" + tmp);
* System.out.println(unescape(tmp));
*/
}
}