输入输出流问题急。。。。

本帖最后由 jmy815 于 2011-03-02 09:55:40 编辑

解决方案 »

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拼 html
类似这样 out.println( " <html> ");
        out.println( " <head> <title> TestServlet </title> </head> ");
        out.println( " <body   bgcolor=\ "#ffffff\ "> ");
        out.println( " <p> The   servlet   has   received   a   POST.   This   is   the   reply. </p> ");         out.println( " </body> </html> ");     }
    //Process   the   HTTP   Put   request
    public   void   doPut(HttpServletRequest   request,   HttpServletResponse   response)   throws   ServletException,   IOException   {
    }
    //Process   the   HTTP   Delete   request
    public   void   doDelete(HttpServletRequest   request,   HttpServletResponse   response)   throws   ServletException,   IOException   {
    }
    //Clean   up   resources
    public   void   destroy()   {
    }
}
你是要在客户端显示retCode还是在客户端要拿到retCode进行操作啊？
显示retCode的话，就可以像之前那样拼html
拿到retCode的话，可以用ajax或jquery等获取
拿到retCode的话，也可以用request.setAttribute()等设置下
然后前台再获取
楼主你忘了写工程名了
请求servlet的路径应该是
http://localhost:8080/工程名称/MyTest
另外为了能够正确的在页面上显示汉字，解决乱码问题，那个方法可以改写为:
private void doProcess(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String retCode = "返回信息";
response.setCharacterEncoding("gbk");
PrintWriter toClient = response.getWriter();
toClient.println(retCode);
}
这种情况一般是ajax用到的
直接自定义一个格式
例如xml
根据responsetext/xml自行解析就是了
楼上兄弟  那我怎么在客户端到流里面取到retCode的值来用呢  如果有代码的话最好了
我帮你写了一下,要想在页面上取得那个值就在servlet那个值放入request对象里了
MyTest.javaimport java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class MyTest extends HttpServlet {
public MyTest() {
super();
} public void destroy() {
super.destroy(); // Just puts "destroy" string in log
} public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { doProcess(request, response);
} public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { doProcess(request, response);
}
public void init() throws ServletException {
// Put your code here
} private void doProcess(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String retCode = "返回信息";
//设定编码
request.setCharacterEncoding("gbk");
//将retCode放到request对象中
request.setAttribute("retCode", retCode);
//转发到index.jsp页面，然后在index.jsp页面通过el表达式或者request.getAttribute("retCode")获得retCode的值
request.getRequestDispatcher("/index.jsp").forward(request, response);
}
}index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gbk" isELIgnored="false"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

  </head>

  <body>
    从servlet获取的值:${retCode}
或者通过java代码<%=request.getAttribute("retCode")%>
  </body>
</html>

输入输出流问题 急。。。。

解决方案 »

输入输出流问题急。。。。