一、介紹兩個類

URLEncoder//編碼

URLDecoder//解碼

看看下面的測試輸出，你就明白是做什麼的了

import java.io.UnsupportedEncodingException;

import java.net.URLDecoder;

import java.net.URLEncoder;

public class main {

 public static void main(String[] args) throws UnsupportedEncodingException{

  System.out.println("UTF-8");

  String a = URLEncoder.encode("中文測試", "UTF-8");//編碼

  System.out.println(a);

  System.out.println(URLDecoder.decode(a,"UTF-8"));//還原

  //下面同理

  System.out.println("\nGBK(百度就是用這種)");

  a = URLEncoder.encode("中文測試", "GBK");

  System.out.println(a);

  System.out.println(URLDecoder.decode(a,"GBK"));

 }

}

[輸出]

UTF-8

%E4%B8%AD%E6%96%87%E6%B5%8B%E8%AF%95

中文測試

GBK(百度就是用這種)

%D6%D0%CE%C4%B2%E2%CA%D4

中文測試

看了上面的輸出就明白百度位址列那一串是什麼了。假如你做了下面一系列設定，那麼在伺服器端你接收到Get方法的中文引數將被轉換成型別%D6%D0%CE%C4%B2%E2%CA%D4 你就需要用到上面的兩個工具類, 如果你像我在下面設定，你在上面的呼叫的第二個引數也得是UTF-8; 使用post就不需要解碼,直接讀取就行了。

二、配置tomcat (這一步我沒有做，但沒發現問題，我用的是Tomcat 5.08經典版本)

開啟tomcat的server.xml檔案，找到區塊，加入如下一行：

URIEncoding="UTF-8"

完整的應如下：

<Connector port="8080" maxThreads="150" minSpareThreads="25" maxSpareThreads="75" enableLookups="false" redirectPort="8443" acceptCount="100" debug="0" connectionTimeout="20000" disableUploadTimeout="true" URIEncoding="UTF-8"/>

三、增加連線資料庫的引數

mysql 資料庫建表時設定編碼為utf8(寫法不同不是UTF-8),

連線資料庫:

 // 連線引數，這裡設定連線使用的編碼

 public static final String DB_URL = "jdbc:mysql://localhost:3306/?useUnicode=true&characterEncoding=utf8";

四、使用過濾器設定編碼 

1、

// 簡單的就用下面這個，這裡使用的是硬編碼也就是在程式碼中寫死了用那種編碼我這裡用utf-8，也可以把編碼設定用寫到web.xml中的Filter設定中

package com.max;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

/**

* Example filter that sets the character encoding to be used in parsing the

* incoming request

*/

public class SetCharacterEncodingFilter implements Filter {

    /**

     * Take this filter out of service.

     */

    public void destroy() {

    }

    /**

     * Select and set (if specified) the character encoding to be used to

     * interpret request parameters for this request.

     */

    public void doFilter(ServletRequest request, ServletResponse response,

    FilterChain chain)throws IOException, ServletException {

    request.setCharacterEncoding("UTF-8");

    // 傳遞控制到下一個過濾器

    chain.doFilter(request, response);

    }

    public void init(FilterConfig filterConfig) throws ServletException {

    }

}

web.xml配置檔案中增加

    <filter>

  <filter-name>Set Character Encoding</filter-name>

  <filter-class>com.max.SetCharacterEncodingFilter</filter-class>

 </filter>

 <filter-mapping>

  <filter-name>Set Character Encoding</filter-name>

  <url-pattern>/*</url-pattern>

 </filter-mapping>

2、

//下面這個是將編碼設定放到web.xml中的

filter類的內容：

/*

 * ====================================================================

 *

 *              JavaWebStudio 開源專案

 *              

 *               Struts_db v0.1

 *

 * ====================================================================

 */

package com.strutsLogin.util;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

/**

 * 中文過濾器

 */

public class SetCharacterEncodingFilter implements Filter {

 // ----------------------------------------------------- Instance Variables

 /**

  * The default character encoding to set for requests that pass through this

  * filter.

  */

 protected String encoding = null;

 /**

  * The filter configuration object we are associated with. If this value is

  * null, this filter instance is not currently configured.

  */

 protected FilterConfig filterConfig = null;

 /**

  * Should a character encoding specified by the client be ignored?

  */

 protected boolean ignore = true;

 // --------------------------------------------------------- Public Methods

 /**

  * Take this filter out of service.

  */

 public void destroy() {

  this.encoding = null;

  this.filterConfig = null;

 }

 /**

  * Select and set (if specified) the character encoding to be used to

  * interpret request parameters for this request.

  *

  * @param request

  *            The servlet request we are processing

  * @param result

  *            The servlet response we are creating

  * @param chain

  *            The filter chain we are processing

  *

  * @exception IOException

  *                if an input/output error occurs

  * @exception ServletException

  *                if a servlet error occurs

  */

 public void doFilter(ServletRequest request, ServletResponse response,

   FilterChain chain) throws IOException, ServletException {

  // Conditionally select and set the character encoding to be used

  if (ignore || (request.getCharacterEncoding() == null)) {

   String encoding = selectEncoding(request);

   if (encoding != null)

    request.setCharacterEncoding(encoding);

  }

  // Pass control on to the next filter

  chain.doFilter(request, response);

 }

 /**

  * Place this filter into service.

  *

  * @param filterConfig

  *            The filter configuration object

  */

 public void init(FilterConfig filterConfig) throws ServletException {

  this.filterConfig = filterConfig;

  this.encoding = filterConfig.getInitParameter("encoding");

  String value = filterConfig.getInitParameter("ignore");

  if (value == null)

   this.ignore = true;

  else if (value.equalsIgnoreCase("true"))

   this.ignore = true;

  else if (value.equalsIgnoreCase("yes"))

   this.ignore = true;

  else

   this.ignore = false;

 }

 // ------------------------------------------------------ Protected Methods

 /**

  * Select an appropriate character encoding to be used, based on the

  * characteristics of the current request and/or filter initialization

  * parameters. If no character encoding should be set, return

  * <code>null</code>.

  * <p>

  * The default implementation unconditionally returns the value configured

  * by the <strong>encoding</strong> initialization parameter for this

  * filter.

  *

  * @param request

  *            The servlet request we are processing

  */

 protected String selectEncoding(ServletRequest request) {

  return (this.encoding);

 }

}// EOC

然後我們在web.xml中加一些配置，就可以了，配置如下：

<filter>

    <filter-name>Set Character Encoding</filter-name>

    <filter-class>javawebstudio.struts_db.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>

<filter-mapping>

    <filter-name>Set Character Encoding</filter-name>

    <url-pattern>/*</url-pattern>

</filter-mapping>

放在web.xml的合適位置。一般在最後，<jsp-config>標籤之前(如果有的話)

五、在JSP頁面中設定編碼

<%@ page language="java" pageEncoding="UTF-8"%>

六、使用i18n

使ApplicationResources.properties支援中文

建立一個ApplicationResources_ISO.properties檔案，把應用程式用的message都寫進去，然後在dos下執行這個命令，

native2ascii -encoding gb2312 ApplicationResources_ISO.properties ApplicationResources.properties

native2ascii          [引數]  [輸入檔案]                          [輸出檔案]

native2ascii這個工具是jdk自帶的一個東東，所以如果path都設定正確就可以直接運行了，你可以在$java_home$/bin下找到他。

轉換後的中文類似於這個樣子

中文格式下 ：user_name_label=使用者名稱：

ascii格式下 ：user_name_label=\用\戶\名\：

Netbean 有個方便的編輯多國語言的工具，但不是直接寫，而是在彈出視窗中編輯，確定插入後自動轉換成ascii如上面那種.

Eclipse 有個一樣功能的外掛jinto在下面的地址中下載

在Jsp頁面使用 "user_name_label" 來引用 "使用者名稱：",而且能夠簡單方便實現多語言支援。

通常將編碼同一成UTF-8是很有好處的，如果想使用其他編碼如GBK,這上面用到UTF-8全改為GBK

有些東西接觸多了就瞭解，做的多了就熟悉。

宣告：這篇只是我自己的總結和備忘錄，希望對你有用，上面引用的程式碼和例子主要來源於網上。