<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<html>
 <head>

  <title>servlet演示</title>
 </head>

 <body>
   <h2>中文亂碼</h2>
   <!-- /servletDemo_1/encode最好用絕對目錄,因為index.jsp位置可能會更改 -->
   <form action="/servletDemo_1/encode" method="post">
    姓名:<input type="text" name="name"/><br/>  
    密碼:<input type="password" name="pwd"/> <br/>   
    <input type="submit" value="登陸"/> 
  </form>
 </body>
</html>

ServletEncoding.java

package cn.hncu.servlet_2;

import java.io.IOException;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class ServletEncoding implements Servlet {

  private String charSet=null;
  @Override
  public void destroy() {

  }

  @Override
  public ServletConfig getServletConfig() {
    return null;
  }

  @Override
  public String getServletInfo() {
    return null;
  }

  @Override
  public void init(ServletConfig config) throws ServletException {
    charSet=config.getInitParameter("char");
    System.out.println("編碼:"+charSet);

  }

  /*
   * 解決中文亂碼
   * 1)更改tomcat平臺中字符編碼(server.xml-connector的屬性)
   * 而tomcat是所有項目的公共平臺,所以不要該,盡量不改
   * 2)反查ISO8859-1編碼:通過String中的亂碼解決方式
   * 3)獲取參數(shù)之前設(shè)置:req.setCharacterEncoding("utf-8");
   * 注意:此種方式必須要是POST方式提交,否則不行
   * 4)獲取參數(shù)之前設(shè)置:通過在web.xml中設(shè)置字符參數(shù)方式把3)做活
   * 5)用過濾器把3)做活--以后實現(xiàn)
   */
  @Override
  public void service(ServletRequest req, ServletResponse resp)
      throws ServletException, IOException {
//   //3)獲取參數(shù)之前設(shè)置
//   req.setCharacterEncoding("utf-8");

    //4)獲取參數(shù)之前設(shè)置:通過在web.xml中設(shè)置字符參數(shù)方式把3)做活
    req.setCharacterEncoding(charSet);

    //讀取信息處理中文亂碼
    String name=req.getParameter("name");
    String pwd=req.getParameter("pwd");
    System.out.println("name:"+name+",pwd:"+pwd);


//   System.out.println("編碼前-name:"+name+",pwd:"+pwd);
//   //2)反查ISO8859-1編碼:通過String中的亂碼解決方式
//   byte bs[]=name.getBytes("iso-8859-1");
//   name=new String(bs,"utf-8");
//   byte bs2[]=pwd.getBytes("iso-8859-1");
//   pwd=new String(bs2,"utf-8");
//   System.out.println("編碼后-name:"+name+",pwd:"+pwd);
//   //注:這種方式對于參數(shù)很多時,就不合適使用了




    resp.setContentType("text/html;charset=utf-8");//設(shè)置協(xié)議:IE沒問題,但是有的瀏覽器不兼容
    //向客戶端應(yīng)答
    String str="<html><head><title></title></head><body><font color='red'>name:"
        +name+",pwd:"+pwd+"</font></body></head>";
    resp.getWriter().println(str);//println()帶刷緩存
  }

}

配置文件web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
  xmlns="http://java.sun.com/xml/ns/javaee" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
  http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
 <display-name></display-name> 


 <servlet>
  <servlet-name>encode</servlet-name>
  <servlet-class>cn.hncu.servlet_2.ServletEncoding</servlet-class>
  <init-param>
    <param-name>char</param-name>
    <param-value>utf-8</param-value>
  </init-param>
 </servlet>

 <servlet-mapping>
  <servlet-name>encode</servlet-name>
  <url-pattern>/encode</url-pattern> 
 </servlet-mapping>



 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
</web-app>

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