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大概內(nèi)容：

1.直接在目標(biāo)中編碼參數(shù)

2.過濾器解決中文亂碼

3.通過一個(gè)基類解決中文亂碼

直接在目標(biāo)中編碼參數(shù)

直接上代碼：

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@SuppressWarnings("serial")
public class Demo3Servlet extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //這里設(shè)置輸出到前端的文本的編碼方式
        response.setContentType("text/html;charset=utf-8");
        String name=request.getParameter("name");
        String age=request.getParameter("age");
        //手動(dòng)將參數(shù)值編碼
        name=new String(name.getBytes("iso-8859-1"),"utf-8");
        //控制臺(tái)輸出
        System.out.println(name+","+age);
        //網(wǎng)頁(yè)上輸出
        response.getWriter().print(name+":歡迎光臨");
    }
    //這里該方法沒有實(shí)際用到
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String name=request.getParameter("name");
        String age=request.getParameter("age");
        System.out.println(name=","+age);
        response.getWriter().print(name+":歡迎光臨");
    }
}

通過過濾器解決中文亂碼

1.先寫一個(gè)過濾器：

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Iterator;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
public class CharacterFilter implements Filter{
    @Override
    public void destroy() {
    }
    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpRequest=(HttpServletRequest) request;
        //生成我們自己包裝好的類
        MyRequest req=new MyRequest(httpRequest);
        chain.doFilter(req, response);//放行
    }
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("過濾器初始化了!");
    }
}
/*
 * 裝飾類
 * 解決get方式請(qǐng)求中的中文亂碼
 */
class MyRequest extends HttpServletRequestWrapper{
    public MyRequest(HttpServletRequest request) {
        super(request);
    }
    //修改增強(qiáng)getParameter方法
    @Override
    public String getParameter(String name) {
        //先獲取原來參數(shù)的值
        String value=super.getParameter(name);
        if("get".equalsIgnoreCase(super.getMethod())){//判斷是否是"get"方式請(qǐng)求
            try {
                //我們自己編碼前端傳來的參數(shù)
                value=new String(value.getBytes("iso-8859-1"),"utf-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        }
        //返回我們處理過的參數(shù)值
        return value;
    }
    //修改增強(qiáng)getParameterValues方法
    @Override
    public String[] getParameterValues(String name) {
        //獲取原來的參數(shù)值
        String values[]=super.getParameterValues(name);
        if("get".equalsIgnoreCase(super.getMethod())){//判斷是否是"get"方式 
            for(int i=0;itry {
                    //我們自己編碼前端傳過來的參數(shù)，其中g(shù)etCharacterEncoding()是我們?cè)趕ervlet中自己設(shè)置的編碼，也可以直接寫哪種編碼
                    values[i]=new String(values[i].getBytes("ISO-8859-1"),getCharacterEncoding());
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
            }
        }
        //返回處理過的參數(shù)數(shù)組
        return values;
    }
    修改增強(qiáng)getParameterMap方法
    @Override
    public Map getParameterMap() {
        //獲取原來的參數(shù)值
        Map map=super.getParameterMap();
        if("get".equalsIgnoreCase(super.getMethod())){//判斷是否是"get"方式
            Iterator> it=map.entrySet().iterator();
            while(it.hasNext()){
                String values[]=it.next().getValue();
                for(int i=0;itry {
                        values[i]=new String(values[i].getBytes("ISO-8859-1"),getCharacterEncoding());
                    } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
        //返回處理過的map
        return map ;
    }
}

2.寫一個(gè)處理數(shù)據(jù)的

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@SuppressWarnings("serial")
public class Demo1Servlet extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //這里給過濾器的裝飾類提前設(shè)置好編碼
        request.setCharacterEncoding("utf-8");
        //這里設(shè)置編碼是輸出到前端時(shí)保證編碼不出錯(cuò)
        response.setContentType("text/html;charset=utf-8");
        String name=request.getParameter("name");
        String strAge=request.getParameter("age");
        //輸出到控制臺(tái)
        System.out.println(name+","+strAge);
        //輸出到頁(yè)面
        response.getWriter().print(name+":歡迎光臨");
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //因?yàn)檫@里演示get方式請(qǐng)求，所以直接調(diào)用doGet()方法
        doGet(request, response);
    }
}

通過一個(gè)基類解決中文亂碼

1.先寫一個(gè)類

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
@SuppressWarnings("serial")
public abstract class BaseServlet extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        String cmd=req.getParameter("cmd");
        if(null==cmd || cmd.equals("")){
            cmd="execute";
        }
        try {
            Method method=this.getClass().getMethod(cmd, HttpServletRequest.class, HttpServletResponse.class);
            //聲明我們自己的包裝類
            MyRequest myRequest=new MyRequest(req);
            method.invoke(this, myRequest, resp);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        doGet(req, resp);
    }
    public abstract void execute(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException;
}
/*
 * 裝飾類
 * 解決get方式請(qǐng)求中的中文亂碼
 */
class MyRequest extends HttpServletRequestWrapper{
    public MyRequest(HttpServletRequest request) {
        super(request);
    }
    //修改增強(qiáng)getParameter方法
    @Override
    public String getParameter(String name) {
        //先獲取原來參數(shù)的值
        String value=super.getParameter(name);
        if("get".equalsIgnoreCase(super.getMethod())){//判斷是否是"get"方式請(qǐng)求
            try {
                //我們自己編碼前端傳過來的參數(shù)，其中g(shù)etCharacterEncoding()是我們?cè)趕ervlet中自己設(shè)置的編碼，也可以直接寫哪種編碼
                value=new String(value.getBytes("ISO-8859-1"),getCharacterEncoding());
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        }
        //返回我們處理過的參數(shù)值
        return value;
    }
    //修改增強(qiáng)getParameterValues方法
    @Override
    public String[] getParameterValues(String name) {
        //獲取原來的參數(shù)值
        String values[]=super.getParameterValues(name);
        if("get".equalsIgnoreCase(super.getMethod())){//判斷是否是"get"方式 
            for(int i=0;itry {
                    //我們自己編碼前端傳過來的參數(shù)
                    values[i]=new String(values[i].getBytes("ISO-8859-1"),getCharacterEncoding());
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
            }
        }
        //返回處理過的參數(shù)數(shù)組
        return values;
    }
    修改增強(qiáng)getParameterMap方法
    @Override
    public Map getParameterMap() {
        //獲取原來的參數(shù)值
        Map map=super.getParameterMap();
        if("get".equalsIgnoreCase(super.getMethod())){//判斷是否是"get"方式
            Iterator> it=map.entrySet().iterator();
            while(it.hasNext()){
                String values[]=it.next().getValue();
                for(int i=0;itry {
                        values[i]=new String(values[i].getBytes("ISO-8859-1"),getCharacterEncoding());
                    } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
        //返回處理過的map
        return map ;
    }
}

2.寫一個(gè)處理數(shù)據(jù)的

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.hncu.utils.BaseServlet;
@SuppressWarnings("serial")
//這里要繼承我們自己寫的BaseServlet類，并實(shí)現(xiàn)他的抽象方法
public class Demo2Servlet extends BaseServlet{
    @Override
    //重寫父類的抽象方法
    public void execute(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        //這里給過濾器的裝飾類提前設(shè)置好
        req.setCharacterEncoding("utf-8");
        //這里設(shè)置編碼是輸出到前端時(shí)保證編碼不出錯(cuò)
        resp.setContentType("text/html;charset=utf-8");
        String name=req.getParameter("name");
        String age=req.getParameter("age");
        System.out.println(name+","+age);
        resp.getWriter().print(name+":歡迎光臨!");
    }
}

上述的三種方式都可以解決get方式請(qǐng)求的中文亂碼問題，第一種最簡(jiǎn)單瀏覽器請(qǐng)求中文參數(shù)亂碼的問題瀏覽器請(qǐng)求中文參數(shù)亂碼的問題，第二種和第三種其實(shí)原理是差不多的：都是對(duì)進(jìn)行包裝，修改或者增強(qiáng)其中的一些方法；下面貼上主頁(yè)代碼和web.xml配置文件的代碼：

index.jsp

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

<html>
  <head>
    <title>解決get方式請(qǐng)求中文亂碼的兩種方式演示title>
  head>
  <body>
    <h3>過濾器解決中文亂碼h3>
    <a href="Demo1Servlet?name=葉秋&age=21">過濾器解決中文亂碼a><br/>
    <a href="Demo2Servlet?name=黃少天&age=22">基類serlvet解決中文亂碼a><br/>
    <a href="Demo3Servlet?name=蘇沐橙&age=23">直接在servlet中解決亂碼a><br/>
  body>
html>

web.xml

<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>
  
  <filter>
    <filter-name>demo1filter-name>
    <filter-class>cn.hncu.filter.CharacterFilterfilter-class>
  filter>
  <filter-mapping>
    <filter-name>demo1filter-name>
    <servlet-name>Demo1Servletservlet-name>
  filter-mapping>
  
  <servlet>
    <servlet-name>Demo1Servletservlet-name>
    <servlet-class>cn.hncu.servlet.Demo1Servletservlet-class>
  servlet>
  <servlet>
    <servlet-name>Demo2Servletservlet-name>
    <servlet-class>cn.hncu.servlet.Demo2Servletservlet-class>
  servlet>
  <servlet>
    <servlet-name>Demo3Servletservlet-name>
    <servlet-class>cn.hncu.servlet.Demo3Servletservlet-class>
  servlet>
  <servlet-mapping>
    <servlet-name>Demo1Servletservlet-name>
    <url-pattern>/Demo1Servleturl-pattern>
  servlet-mapping>    
  <servlet-mapping>
    <servlet-name>Demo2Servletservlet-name>
    <url-pattern>/Demo2Servleturl-pattern>
  servlet-mapping>
  <servlet-mapping>
    <servlet-name>Demo3Servletservlet-name>
    <url-pattern>/Demo3Servleturl-pattern>
  servlet-mapping>    
  <welcome-file-list>
    <welcome-file>index.jspwelcome-file>
  welcome-file-list>
web-app>