为什么插入数据库中的中文为乱吗

package com.bean;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//注册servlet
public class NewUserLoginServlet extends HttpServlet { public NewUserLoginServlet() {
super();
} public void init() throws ServletException { } 

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

 
String name = request.getParameter("username");
String pass = request.getParameter("password");
String sex = request.getParameter("sex");
String email = request.getParameter("email");
String Phone = request.getParameter("tel");

// javaBean---------
PersonManager pb = new PersonManager();
pb.setName(name);
pb.setPass(pass);
pb.setSex(sex);
pb.setEmail(email);
pb.setPhone(Phone);

//调用insert（）如果用户注册成功的话就从定向到指定网爷
boolean result = ConnectionDatabase.insert(pb);

if (result)
response.sendRedirect("success.html");
else
response.sendRedirect("login.html");

} public void destroy() {
super.destroy(); }}