javaweb基础概念

response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8");
request.setCharacterEncoding("utf-8");//对于get请求无效

public String getEncode(String str) throws UnsupportedEncodingException{
    return new String(str.getBytes("ISO8859-1"),"utf-8");
}

String name = getEncode(request.getParameter("username"));  调用方法，将传过来username对应的字符串设置编码

PrintWriter pw = response.getWriter();
            pw.write("文字提示");

1     response.sendRedirect("/work2/login.jsp");    

1 <%= 表达式 %>

1 jsp:页面  Java Server Page
2 第一行：<%@ page 指令%>
3 <%
4     java代码
5 %>

1 String name = request.getParameter("username");     //获得表单传送来的值      
2 request.setAttribute("name", name);                  
3 request.getRequestDispatcher("/admin_select.jsp").forward(request, response);  //将参数name对应的键传送到指定Jsp文件

1 <a href="url2.jsp?number=<%=sum%>">跳转url2.jsp文件</a>