深入体验JavaWeb开发内幕——Request中的乱码问题及解决

来源:互联网 发布:java流的分类 编辑:程序博客网 时间:2024/06/15 06:43

前面我们提到了Response对象中出现乱码问题及相应的解决措施,那么在Request中如何解决编码问题呢?

下面来看具体的例子:

例如我想将一个form表单中的信息提取到并在控制台输出如图:

 

假设在服务端并未Request对象给指定编码时那么你在客户端添加信息如:

填入的信息有中文

假设设置表单的提交方式为post方式提交

则在服务端输出如下:

代码如下:

Register.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>Register.html</title>    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="this is my page">    <meta http-equiv="content-type" content="text/html; charset=UTF-8">        <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->  </head>    <body>  <form action ="RequestLogin" method ="post">    用户名:<input type="text" name = "username" ><br/>    密码:  <input type="password" name = "password"><br/>  性别:<input type="radio" name = "sex" value ="male">男      <input type="radio" name = "sex" value ="female">女<br/>  籍贯: <select name ="city">        <option value ="HeBei">河北</option>        <opton value ="HuBei">湖北</opton>        <option value ="ShanXi">山西</option>      </select><br/>简历:<br/>   &nsp;<textarea rows="5" cols="20" name ="intro"></textarea><br/>爱好:<br/><input type="checkbox" name ="hobbies" value ="sing"/>唱歌<input type="checkbox" name ="hobbies" value ="dance"/>跳舞<input type="checkbox" name ="hobbies" value ="readbook"/>读书<input type="checkbox" name ="hobbies" value ="readnewspaper"/>看报<br/>上传头像:<br/><input type="file" value ="image" name ="browser"><br/><input type="submit" value ="提交"/>  </form>    </body></html>




RequestLogin.javapackage net.csdn.request;import java.io.IOException;import java.io.PrintWriter;import java.io.UnsupportedEncodingException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class RequestLogin extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException{ getInformation(request); }private void getParameter(HttpServletRequest request)throws UnsupportedEncodingException{private void getInformation(HttpServletRequest request)throws UnsupportedEncodingException {//取出参数值 String name = request.getParameter("username"); String pass = request.getParameter("password"); String sex = request.getParameter("sex"); String city = request.getParameter("city"); String intro = request.getParameter("intro"); String [] hobbies = request.getParameterValues("hobbies"); String hobby =""; //hobbies!=null对所取值为空时进行设置 for(int i=0;hobbies!=null&&i<hobbies.length;i++){ String hovalue = hobbies[i]; hobby += hovalue; } //获取头像信息 // String image = request.getParameter("image"); System.out.println("username:"+name); System.out.println("password:"+pass); System.out.println("sex:"+sex); System.out.println("city:"+city); System.out.println("intro:"+intro); System.out.println("hobby:"+hobby);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

这是因为你在RegisterLogin.java中并没有给Request对象设置编码集,而Request对象的默认编码集是ISO8859-1是不支持汉字的,所以你只需要在此类中为其指明相应的编码即可:
改正:
  request.setCharacterEncoding("utf-8");
即可输出:



但是这种方式只在提交方式为post时有效当提交方式为get时是不起作用的。
即;
<form action ="RequestLogin" method ="get">
时即便在

RequestLogin.java
中再设置
  request.setCharacterEncoding("utf-8");
也不会起任何作用了如图:


 


这时就需要在
 
RequestLogin.java
中的含有中文的地方进行如下设置了即:
 String username = new String(name.getBytes("iso8859-1"),"utf-8");
         String introduction = new String(intro.getBytes("iso8859-1"),"utf-8");
 System.out.println("username:"+username);
           System.out.println("password:"+introduction);

此时再度测试时就OK了!如图



好了到这里,你大概已经知道该如何对Response和Request对象中的乱码问题进行操作了吧!



	
				
		
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