BaseServlet扩展了的HttpServlet,包装Request来处理中文乱码

1.BaseServlet

package czb.utils;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

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;

/**

 * 对HttpServlet 进行扩展

 */

public abstract class BaseServlet extends HttpServlet {

    public void service(HttpServletRequest request, HttpServletResponse response)

            throws ServletException,IOException {

        // 设置post中文乱码问题

        request.setCharacterEncoding("UTF-8");

        // 接受用户请求的方法

        String methodName = request.getParameter("metd");

        if (methodName == null ||methodName.trim().equals("")) {

            methodName= "execute";

        }

        try {

            // 反射出子类的方法

            Method method = this.getClass().getMethod(methodName,

                   HttpServletRequest.class, HttpServletResponse.class);

            if(request.getMethod().equals("GET")) {// 如果是get才包装

                request= newMyServletRequest(request);

            }

            // 调用子类的方法

            method.invoke(this, request, response);

        }catch(Exception e) {

            thrownew RuntimeException(e);

        }

    }

    public abstract void execute(HttpServletRequest request,

            HttpServletResponseresponse) throwsException;

}

2 对HttpServletRequest包装的类

class MyServletRequest extends HttpServletRequestWrapper {

    //private HttpServletRequest request;此处不用声明成员直接使用父类就行，可
    //模仿HttpServletRequestWrapper   
    //public HttpServletRequestWrapper(HttpServletRequest request) {super(request);}

    public MyServletRequest(HttpServletRequest request) {

        super(request);

    }

    @Override

    public String getParameter(Stringname) {

        Stringvalue = super.getParameter(name);

        try {

            value= new String(value.getBytes("ISO-8859-1"),

                   super.getCharacterEncoding());

        }catch(UnsupportedEncodingException e) {

            throw new RuntimeException(e);

        }

        return value;

    }

    // 增强getPamaterValues方法

    @Override

    public String[]getParameterValues(String name) {

        String[]values = super.getParameterValues(name);

        for (int i = 0; i < values.length; i++) {

            try {

                values[i]= new String(values[i].getBytes("ISO-8859-1"),

                       super.getCharacterEncoding());

            }catch(UnsupportedEncodingException e) {

                throw new Run   timeException(e);

            }

        }

        return values;

    }

    // 修改getParmentetMap

    @Override

    public Map<String,String[]> getParameterMap() {

        Map<String,String[]> map = super.getParameterMap();

        // 只需要获取value

        Iterator<String[]>it = map.values().iterator();

        while (it.hasNext()) {

            String[]values = it.next();

            for (int i = 0; i < values.length; i++) {

                try {

                   values[i]= newString(values[0].getBytes("ISO-8859-1"),

                           super.getCharacterEncoding());

                }catch(UnsupportedEncodingException e) {

                   throw new RuntimeException(e);

                }

            }

        }

        return super.getParameterMap();

    }

}

3.BaseServlet的实现类

package czb.servlet;

import czb.utils.BaseServlet;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public classStudServlet extends BaseServlet {

    @Override

    public void execute(HttpServletRequest request, HttpServletResponse response)

            throws Exception {

        String name = request.getParameter("name");

        System.err.println("1:"+name);

        String[] vals=request.getParameterValues("name");

        System.err.println("2:"+vals[0]);

        Map<String,String[]> map = request.getParameterMap();

        System.err.println("3:"+map.get("name")[0]);

    }

}

4.显示

<%@ page language="java"contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<html>
<head>
</head>
<body>
  <form action="StudServlet" method="post">
     Name:<input type="text" name="name"id="nm">
     <input type="submit" value="提交">
  </form>
  <br/>
  <a href="javascript:_go();">GO</a>
</body>
<script type="text/javascript">
 function_go(){
      var nm=document.getElementById("nm").value;
      var url = "StudServlet?name="+nm;
      //对url进行编码
      url=encodeURI(url);
      alert(url);
      window.location=url;
 }
</script>
</html>