当ajsx出现乱码时,请检查以下几点

末蓝、 2022-08-07 01:43 121阅读 0赞

当ajsx出现乱码时,请检查以下几点

1/ 连接数据库的编码:

static private String strUrl = "jdbc:mysql://localhost:3306/数据库名称?useUnicode=true&characterEncoding=utf-8";

2/ web-inf/web.xml

<filter>  
<filter-name>Set Character Encoding</filter-name>  
<filter-class>xx.center.SetCharacterEncodingFilter</filter-class>  
<init-param>  
<param-name>encoding</param-name>  
<param-value>utf-8</param-value>  
</init-param>  
<init-param>  
<param-name>ignore</param-name>  
<param-value>true</param-value>  
</init-param>  
</filter>  
当然SetCharacterEncodingFilter.java(tomcat目录下有源文件,直接拷过去就行)要放在相应的位置

3/ajax所在页面

request.open("GET",encodeURI(encodeURI(url)), true);//\*\*\*\*\*\*\*\*\*\*两次encodeURI是关键\*\*\*\*\*\*\*\*\*\*  
request.setRequestHeader( "Content-Type", "text/html;charset=UTF-8" );  
4/接收后台要解码:

sortname = java.net.URLDecoder.decode(sortname, "UTF-8");

检查以上几点，基本就这样。

／／／／／／／／／／／／／／／／／／／／／／／／

小注：由于我的产品要集成到另外一个环境为gb2312的编码当中．只能将相关编码方式从utf-8转成gb2312,

折腾我一晚上．现记录下来．

///

1、将以上注释的各个地方utf-8更改成gb2312.

２、将server.xml的<Connector..... URIEncoding="gb2312" useBodyEncodingForURI="true"/>

3、编写转换代码:

package cn.\*\*\*.center;

public class utf8Togb2312 \{

/\*\*  
\* @param args  
\*/  
public static void main(String\[\] args) \{  
// TODO Auto-generated method stub

public String utf8Togb2312(String str)\{  
StringBuffer sb = new StringBuffer();  
for(int i=0; i<str.length(); i++) \{  
char c = str.charAt(i);  
switch (c) \{  
case '+':  
sb.append(' ');  
break;  
case '%':  
try \{  
sb.append((char)Integer.parseInt(  
str.substring(i+1,i+3),16));  
\}  
catch (NumberFormatException e) \{  
throw new IllegalArgumentException();  
\}  
i += 2;  
break;  
default:  
sb.append(c);  
break;  
\}  
\}  
// Undo conversion to external encoding  
String result = sb.toString();  
String res=null;  
try\{  
byte\[\] inputBytes = result.getBytes("8859\_1");  
res= new String(inputBytes,"UTF-8");  
\}  
catch(Exception e)\{\}  
return res;  
\}

在需要调用的地方加上

utf8Togb2312 uTog=new utf8Togb2312();  
String sortname =uTog.utf8Togb2312(request.getParameter("sortname"));

这时，sortname就成功由utf8转码成gb2312

以下是gb2312转utf8。以备后用。

package cn.\*\*\*.center;

import java.io.UnsupportedEncodingException;

public class gb2312Toutf8 \{

/\*\*  
\* @param args  
\*/  
public static void main(String\[\] args) \{  
// TODO Auto-generated method stub

public String convertString(String gbk)\{  
String utf8 = "";  
try \{  
  
System.out.println("是我输出的内容gbk:"+gbk+"<p>");  
utf8 = new String(gbk2utf8(gbk),"UTF-8");  
System.out.println("是我输出的内容utf8:"+utf8+"<p>");  
\} catch (UnsupportedEncodingException e) \{  
e.printStackTrace();  
\}  
return utf8;  
\}

public byte\[\] gbk2utf8(String chenese) \{  
char c\[\] = chenese.toCharArray();  
byte\[\] fullByte = new byte\[3 \* c.length\];  
for (int i = 0; i < c.length; i++) \{  
int m = (int) c\[i\];  
String word = Integer.toBinaryString(m);

StringBuffer sb = new StringBuffer();  
int len = 16 - word.length();  
for (int j = 0; j < len; j++) \{  
sb.append("0");  
\}  
sb.append(word);  
sb.insert(0, "1110");  
sb.insert(8, "10");  
sb.insert(16, "10");

String s1 = sb.substring(0, 8);  
String s2 = sb.substring(8, 16);  
String s3 = sb.substring(16);

byte b0 = Integer.valueOf(s1, 2).byteValue();  
byte b1 = Integer.valueOf(s2, 2).byteValue();  
byte b2 = Integer.valueOf(s3, 2).byteValue();  
byte\[\] bf = new byte\[3\];  
bf\[0\] = b0;  
fullByte\[i \* 3\] = bf\[0\];  
bf\[1\] = b1;  
fullByte\[i \* 3 + 1\] = bf\[1\];  
bf\[2\] = b2;  
fullByte\[i \* 3 + 2\] = bf\[2\];

\}  
return fullByte;  
\}