Java httpservletresponse 中的sendRedirect()方法的重定位亂碼的總結

最近httpservletresponse 中的sendRedirect()的方法，測試其中文亂碼。

測試方法是用一個簡單的登入介面Login.java(純servlet的),登入成功的話，在LoginDeal.java(純servlet的), 中使用 httpservletresponse 中的sendRedirect()方法的重定位，重定位的目的也是個servlet檔案叫MainFrame.java，要想不產生亂碼，設定如下：

Login.java中：

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;

public class Login extends HttpServlet {

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

this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
//response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
out.println("<h1>使用者登入</h1>");
out.println("<form action='/servlettest/LoginDeal' method=post>");
out.println("使用者名稱：<input type='text' name='username'> <br>");
out.println("密&nbsp&nbsp碼：<input type='password' name='pwd'> <br>");
out.println("<input type='submit' value='login'> <br>");
out.println("</form>");

}
}

LoginDeal.java  代碼如下：

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;

import tools.MyTools;
import com.zy.model.*;

public class LoginDeal extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

this.doPost(request, response);
}

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

response.setContentType("text/html");//這個地方要特別注意，千萬不能有其他設定了！！！！！不然會出現很讓人不能理解的亂碼！！

PrintWriter out = response.getWriter();

String uname = request.getParameter("username");
String username = MyTools.getNewCodeString(uname);
String passwd = request.getParameter("pwd");

System.out.println("LoginDeal中uname="+uname);
System.out.println("LoginDeal中username="+username);
System.out.println("LoginDeal中passwd="+passwd);

//如果登入成功，將使用者名稱和密碼傳給MainFrame
if("你好".equals(username)&&"123".equals(passwd)){
response.sendRedirect("/servlettest/MainFrame?uname="+uname+"&pwd="+passwd);//傳統方式

}else{
//如果使用者名稱和密碼不正確，則跳回到登入介面
response.sendRedirect("Login");
}
}
}

MainFrame.java 代碼如下：

package com.zy.view;
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;

import com.zhengyi.tools.MyTools;
import com.zy.model.Users;
public class MainFrame extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

this.doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");//此處就這樣設定就行了~~~~

PrintWriter out = response.getWriter();

//使用傳統的方法接受使用者名稱和密碼
String uname=request.getParameter("uname");
String username = MyTools.getNewCodeString(uname);
//String uname=(String)request.getAttribute("uname");

System.out.println("MainFrame中uname:"+uname);
System.out.println("MainFrame中username:"+username);

//使用傳統的方法顯示使用者名稱和密碼
//out.println("MainFrame中uname:"+uname+"<br>");
out.println("MainFrame中username="+username);
//out.println("password="+password);
}

}