跟简单的代码问题

我做了一个Servlet，现在通过前台javascript访问，关键代码如下：
xmlhttp.open("GET","http://192.168.255.56/Servlet/GetOnlinePeople?userName="+encodeURIComponent(document.all.UserName.value),true);
通过GET方式发送，参数通过encodeURIComponent加密。
Servlet代码如下：
import java.util.Hashtable;
import java.util.Iterator;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class GetOnlinePeople extends HttpServlet {
private static final long serialVersionUID = 4944504468093069504L;
public static Hashtable ht = new Hashtable();
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException {
try {
System.out.println("============Begin=============");
ht.put(req.getParameter("userName"),req.getParameter("userName"));
Iterator it = ht.values().iterator();
while(it.hasNext()){
String temp = (String) it.next();
System.out.println(temp);
}
System.out.println("============End=============");
} catch (Exception n) {
n.printStackTrace();}finally
{

}
}
}
问题：
参数是数字，或者英文的时候，没有问题，能把哈希表里的内容打印出来，但是前台传的参数是中文的时候，就是乱码，请高手解决下，贴出代码供奉送300分，看我的结贴率。

解决方案 »

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doget方法里第一句加上 resp.setContentType("text/html;charset=gb2312");
给你一段代码看看可以显示中文package org.fox_ice.servlet;import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.ArrayList;public class GetDBInfoServlet extends HttpServlet
{
    private String url;
    private String user;
    private String password;

    public void init() throws ServletException
    {
        ServletContext sc=getServletContext();
        String driverClass=sc.getInitParameter("driverClass");
        url=sc.getInitParameter("url");
        user=sc.getInitParameter("user");
        password=sc.getInitParameter("password");
        try
        {
            Class.forName(driverClass);
        }
        catch(ClassNotFoundException ce)
        {
            throw new ServletException("加载数据库驱动失败！");
        }
    }

    public void doGet(HttpServletRequest req, HttpServletResponse resp)
               throws ServletException,IOException
    {
        Connection conn=null;
        Statement stmt=null;
        ResultSet rs=null;

        try
        {
            conn=DriverManager.getConnection(url,user,password);

            resp.setContentType("text/html;charset=gb2312");
            PrintWriter out=resp.getWriter();
            out.println("<html><head>");
            out.println("<title>数据库表的信息</title>");
            out.println("</head><body>");

            String tableName=req.getParameter("tableName");
            if(null==tableName || tableName.equals(""))
            {
                DatabaseMetaData dbMeta=conn.getMetaData();
                rs=dbMeta.getTables(null,null,null,new String[]{"TABLE"});
                out.println("<form action=\"getdbinfo\" method=\"get\">");
                out.println("<select size=1 name=tableName>");
                while(rs.next())
                {
                    out.println("<option value="+rs.getString("TABLE_NAME")+">");
                    out.println(rs.getString("TABLE_NAME"));
                    out.println("</option>");
                }
                out.println("</select><p>");
                out.println("<input type=\"submit\" value=\"提交\">");
                out.println("</form>");
            }
            else
            {
                stmt=conn.createStatement();
                rs=stmt.executeQuery("select * from "+tableName);
                ResultSetMetaData rsMeta=rs.getMetaData();
                int columnCount=rsMeta.getColumnCount();
                out.println("<table border=1>");
                out.println("<caption>表的结构</catption>");
                out.println("<tr><th>字段名</th><th>字段类型</th><th>最大字符宽度</th></tr>");

                ArrayList<String> al=new ArrayList<String>();
                for(int i=1;i<=columnCount;i++)
                {
                    out.println("<tr>");
                    String columnName=rsMeta.getColumnName(i);
                    out.println("<td>"+columnName+"</td>");
                    al.add(columnName);
                    out.println("<td>"+rsMeta.getColumnTypeName(i)+"</td>");
                    out.println("<td>"+rsMeta.getColumnDisplaySize(i)+"</td>");
                }
                out.println("</table><p>");

                out.println("<table border=1>");
                out.println("<caption>表中的数据</catption>");
                out.println("<tr>");

                for(int i=0;i<columnCount;i++)
                {
                    out.println("<th>"+al.get(i)+"</th>");
                }

                while(rs.next())
                {
                    out.println("<tr>");
                    for(int i=1;i<=columnCount;i++)
                    {
                        out.println("<td>"+rs.getString(i)+"</td>");
                    }
                    out.println("</tr>");
                }
                out.println("</table>");
            }
            out.println("</body><html>");
            out.close();
        }
        catch(SQLException se)
        {
            se.printStackTrace();
        }
        finally
        {
            if(rs!=null)
            {
                try
                {
                    rs.close();
                }
                catch(SQLException se)
                {
                    se.printStackTrace();
                }
                rs=null;
            }
            if(stmt!=null)
            {
                try
                {
                    stmt.close();
                }
                catch(SQLException se)
                {
                    se.printStackTrace();
                }
                stmt=null;
            }
            if(conn!=null)
            {
                try
                {
                    conn.close();
                }
                catch(SQLException se)
                {
                    se.printStackTrace();
                }
                conn=null;
            }
        }
    }
}
import java.util.Hashtable;
import java.util.Iterator;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; public class GetOnlinePeople extends HttpServlet {
private static final long serialVersionUID = 4944504468093069504L;
public static Hashtable ht = new Hashtable();
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException {
try {
resp.setContentType("text/html;charset=gb2312");System.out.println("============Begin=============");
ht.put(req.getParameter("userName"),req.getParameter("userName"));
Iterator it = ht.values().iterator();
while(it.hasNext()){
String temp = (String) it.next();
System.out.println(temp);
}
System.out.println("============End=============");
} catch (Exception n) {
n.printStackTrace(); }finally
  {   }
}
}
不妨这样试试:
在servlet中取得参数
req.getParameter("userName"),
之前,加上这句代码:
req.setCharacterEncoding("gbk");
...
System.out.println("============Begin=============");
ht.put(req.getParameter("userName"),req.getParameter("userName"));
Iterator it = ht.values().iterator();
while(it.hasNext()){
String temp = (String) it.next();
System.out.println(temp);
}
System.out.println("============End=============");
  res.setContentType("text/xml;charset=UTF-8");//注意这里设定字符集和页面一致；
try {
res.getWriter().write(temp);//因为lz发送ajax请求，这样返回。
} catch (IOException e) {
e.printStackTrace();
}
        return null;
...
package ServletPackage;import java.util.Hashtable;
import java.util.Iterator;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class GetOnlinePeople extends HttpServlet {
private static final long serialVersionUID = 4944504468093069504L;
public static Hashtable ht = new Hashtable(); public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException {
try {
System.out.println("============Begin=============");
req.setCharacterEncoding("UTF-8");//注意这里设定字符集和页面一致
res.setContentType("text/xml;charset=UTF-8");//注意这里设定字符集和页面一致；
ht.put(req.getParameter("userName"), req.getParameter("userName"));
Iterator it = ht.values().iterator();
while (it.hasNext()) {
String temp = (String) it.next();
System.out.println(temp);
}
System.out.println("============End=============");
} catch (Exception n) {
n.printStackTrace(); } finally { }
}
}